CN116002884A - Regulation and storage tank and combined overflow sewage purification treatment method - Google Patents
Regulation and storage tank and combined overflow sewage purification treatment method Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Biological Treatment Of Waste Water (AREA)
Abstract
The invention discloses a regulating and accumulating tank and a combined overflow sewage purification treatment method, wherein the regulating and accumulating tank comprises a regulating and accumulating area, a biomembrane fluidized bed unit and a clarification system from one end to the other end in sequence; wherein the biofilm fluidization bed unit comprises a plurality of groups of biofilm pools; each group of the biological film tanks comprise a pre-anoxic tank biological film tank, an anoxic tank biological film tank, a pre-aerobic biological film tank, an aerobic biological film tank and a biological film system reflux and water outlet distribution area; the combined overflow sewage purification treatment method provided by the invention can obviously improve the sewage purification capability.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a regulating reservoir and a combined overflow sewage purification treatment method.
Background
Along with the acceleration of the urban process, the discharge amount of domestic sewage is continuously increased, and meanwhile, the pollution of urban sources, particularly the pollution of initial rainwater runoff, is also increasingly serious. Because of the limitation of the treatment capacity of the combined pipe network system and the sewage plant, a large amount of mixed rain sewage overflows to the receiving water body, and serious harm is brought to the urban river network water system, and the overflowed pollutant components comprise conventional pollutants (nitrogen, phosphorus, particulate matters), heavy metals, oils and the like. So the combined overflow (combined sewer overflow, CSO) pollution control is a common problem in the water environment treatment of many places.
The existing overflow sewage treatment mode comprises the following steps: 1. the overflow sewage is pumped to a sewage treatment plant, see in detail fig. 1a; the most original planning and positioning of the CSO regulation and storage tank are that the combined sewage is stored through the CSO regulation and storage tank and then is pumped to a sewage treatment plant in a drainage area in a peak shifting mode, and the final discharge is carried out after the sewage treatment plant processes the sewage. 2. The overflow sewage is lifted to a new sewage treatment facility, and the detailed description is shown in fig. 1b, the new town sewage treatment facility beside the CSO regulation reservoir is basically consistent with the common urban sewage treatment plant in the internal process route of the treatment facility, and the full-process chains of primary pretreatment, secondary biochemical treatment, tertiary advanced treatment, sludge treatment and the like are covered, wherein the secondary biochemical treatment adopts more activated sludge process technologies such as AAO, SBR, MBR and the like, and the treated rainwater and sewage reach the standard are finally discharged. 3. CSO reservoir enhancement (chemical treatment enhancement), see fig. 1c for details; compared with the schemes 1 and 2, the technical route strengthens the CSO regulation and storage, introduces a coagulating sedimentation mode, endows the CSO regulation and storage with certain pollutant treatment capacity, directly discharges the effluent of the regulation and storage tank, and does not pump to a sewage treatment plant.
The Shanghai city construction design institute of research discloses a regulating reservoir (CN 103193340A) with a treatment function, which comprises a regulating reservoir, a reaction zone, a diversion zone and a sedimentation zone, wherein the regulating reservoir is provided with a water inlet box culvert, a stirrer is arranged in the reaction zone, the sedimentation zone is provided with a water outlet and a mud pipe, and the reaction zone, the diversion zone and the sedimentation zone are all arranged on the upper end face of the regulating reservoir; a lifting pump used for conveying sewage from the regulation and storage area to the reaction area is arranged between the reaction area and the regulation and storage area, and a diversion area is arranged between the reaction area and the sedimentation area to guide the mixed liquid in the reaction area into the sedimentation area. According to the method, the coagulating sedimentation equipment is additionally arranged on the top of the regulating reservoir, and the rainwater and sewage combined in the regulating reservoir are subjected to preliminary strengthening treatment, so that the regulating reservoir with the treatment function, which is compact in occupied area, low in energy consumption and capable of improving the water quality of the discharged water, is achieved.
The university of Tianjin discloses a rainwater regulation and storage tank (CN 102493545B) with a coagulating sedimentation function, which is similar to the patent mode disclosed by Shanghai city construction and design institute, except that the traditional regulation and storage tank is completely designed into a coagulating sedimentation tank mode by the technical route, and the regulation and storage area is not considered separately. The device has higher turbidity and COD removal rate of the initial rainwater, and can reach more than 90 percent.
The objective disadvantage of the prior art is that the above scheme 1-sewage is pumped to a sewage treatment plant, and the mixed treatment of the sewage to nearby sewage treatment plants has more disadvantages from the aspects of economy, operation management and the like:
(1) with the development of town, most built sewage plants in China are located at the inner edge of cities, CSO regulation facility construction lands are not arranged around the built sewage plants, most regulation facility construction is far away from the urban sewage plants, secondary pipeline laying is needed by means of pumping, and the investment required by pipeline laying in individual areas is greatly more than that of newly built sewage treatment facilities.
(2) This approach is not suitable for areas where most municipal wastewater plants in China are operating at full load or even at overload. The method is characterized in that the method does not currently have the capacity of treating peak flow in rainy season in many urban sewage plants in China, the treatment scale of the sewage plants is determined, the treatment of the peak flow in rainy season is not considered, the change coefficient K of the comprehensive domestic sewage is considered only according to the split-flow water yield estimation principle, compared with developed countries, the K value given by the outdoor drainage design Specification (GB 50014-2006, 2016 edition) in China is lower, and secondly, the design flow of structures of the sewage plants does not consider the treatment of the peak flow in rainy season and cannot accept the treatment of redundant rain sewage.
According to the scheme 2, the problem that overflow rain sewage of the scheme 1 is not treated is solved by constructing a full-flow sewage treatment plant near the CSO regulation and storage tank, but the defect is that newly-built sewage plants are high in investment, if indexes such as pollutants COD, BOD, TN, TP, ammonia nitrogen and suspended matters reach the surface III water standard, a full-flow sewage treatment process is required to be constructed, a primary pretreatment (a grit chamber and a primary sedimentation tank), a secondary biochemical treatment (an activated sludge method is generally selected as a conventional selected secondary biochemical treatment process), three-level advanced treatment (coagulation sedimentation and filtration) and auxiliary facilities such as blast aeration, sludge dewatering, medicament preparation and throwing, electric automatic control are adopted. The process has longer chain, larger occupied area (the activated sludge method needs to build a secondary sedimentation tank), higher operation and maintenance cost and higher investment limit.
Above-mentioned scheme 3 belongs to carrying out the functional enhancement processing on current regulation facility basis, and CN 103193340A, CN 102493545B all have done local enhancement around the coagulating sedimentation technique, and both have following drawback:
(1) both the two are free from subsequent filtering units, and common coagulating sedimentation cannot ensure that the suspended matters in the effluent are stably smaller than 10 mg/L;
(2) The two are only subjected to strengthening treatment by a physicochemical method, so that suspended matter indexes can be greatly reduced to a certain extent, TP indexes cannot be greatly reduced (inorganic phosphorus such as phosphate radical and the like can be removed only due to coagulating sedimentation, organic phosphorus which is solid in raw water cannot be removed), and the reduction amplitude is small for COD, BOD, TN and ammonia nitrogen due to the lack of a biochemical process chain, so that the final overall emission standard cannot reach the water quality standard of the emission river;
(3) both the two are only considered in the design of coagulating sedimentation, and auxiliary units such as a medicament preparation adding unit and a sludge dewatering unit are not considered integrally, so that additional building is possibly needed;
(4) in the coagulating sedimentation design, the area of the sedimentation tank is designed to be larger, so that the whole occupied area is larger;
(5) the regulating reservoirs in CN 102493545B are all designed into a coagulating sedimentation form, and are not additionally distinguished into regulating water storage areas, so that the investment amount of the form can be high for larger regulating facilities (because the coagulating sedimentation area needs to be filled with nonstandard equipment as a continuous operation condition of the nonstandard equipment);
disclosure of Invention
The invention provides a regulating reservoir and a combined overflow sewage purification treatment method, which are used for solving the problems in the prior art.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a regulating reservoir (regulating reservoir), which comprises a regulating reservoir zone 100, a biomembrane fluidized bed unit 200 and a clarification system 300 from one end to the other end in sequence;
wherein the biofilm fluidized bed unit 200 comprises a plurality of groups of biofilm pools; each group of biological film tanks comprises a pre-anoxic tank biological film tank 1, an anoxic tank biological film tank 2, a pre-aerobic biological film tank 3, an aerobic biological film tank 4, a biological film system reflux and effluent distribution area 5; a pretreatment mesh bag 34 is arranged between the biological film fluidized bed unit 200 and the regulation zone 100 and near the inner side of the biological film fluidized bed unit 200; wherein, the pre-anoxic tank biological film tank 1, the anoxic tank biological film tank 2, the pre-aerobic biological film tank 3, the aerobic biological film tank 4 and the biological film system reflux and water outlet distribution area 5 in each group of biological film tanks are communicated with each other through pipelines in sequence between every two adjacent film tanks according to the arrangement sequence;
a first rapid purification device 28 is arranged on a connecting pipeline between the regulation and storage area 100 and the biological film fluidized bed unit 200; the inlet end of the first rapid purification device 28 is connected to the water outlet of the end of the regulating reservoir in the regulating reservoir area 100, and the water outlet end of the first rapid purification device 28 is connected to the pretreatment mesh bag 34;
Wherein polyurethane fluidized bed filler 15 is arranged in the pre-anoxic tank biological film tank 1 and the anoxic tank biological film tank 2, and a biological film anoxic tank circulation stirrer 16 is arranged at the bottoms of the pre-anoxic tank biological film tank 1 and the anoxic tank biological film tank 2; the biomembrane anoxic tank circulation stirrer 16 makes the water flow in the tank body form circulation by adopting a mode of absorbing water at the bottom and uniformly spraying water towards the depth direction of the tank so as to make the polyurethane fluidized bed filling 15 in a fluidized state; the fluidized bed filler interception screen 14 is arranged at the inlet and outlet of different monomer tanks of the pre-anoxic tank biological film tank 1 and the anoxic tank biological film tank 2, and is used for protecting the polyurethane fluidized bed filler 15 from being discharged along with the effluent water, and ensuring the filler filling ratio in the monomer tanks; the pretreatment mesh bag 34 is used for intercepting coarse floaters and preventing the floaters from fouling the fluidized bed filler interception screen 14 in the biological membrane fluidized bed unit 200;
polyurethane fluidized bed filler 15 and a biological film aerobic tank aeration device 17 are arranged in the pre-aerobic biological film tank 3 and the aerobic biological film tank 4; the air inlet end of the biological film aerobic tank aeration device 17 is connected with a blower unit 30 in the auxiliary equipment room 12; the air outlet end of the biomembrane aerobic tank aeration device 17 is arranged on the bottom surface of the bottom of the tank bottom and is used for extruding the blown air to float from bottom to top so as to realize the suspension state of the polyurethane fluidized bed filler 15;
The clarification system 300 is used for carrying out reduction treatment on SS and TP in the raw water body so as to clarify the water body; the four sections of biological film tanks adopt polyurethane filling 15 as biological film carriers, namely a pre-anoxic tank biological film tank 1, an anoxic tank biological film tank 2, a pre-aerobic biological film tank 3 and an aerobic biological film tank 4.
Preferably, as an alternative embodiment, the clarification system 300 comprises a loaded clarifier water distribution zone 6, a coagulant reaction tank 7, a loaded reaction tank 8, a flocculant reaction tank 9, and a loaded sediment clarification zone 10; the water distribution area 6 of the loading clarifying tank, the coagulant reaction tank 7, the loading reaction tank 8, the flocculant reaction tank 9 and the loading sedimentation clarifying area 10 are communicated with each other through pipelines in sequence every two adjacent areas according to the arrangement sequence; the water outlet end of the loading sedimentation clarification zone 10 is connected with a second rapid purification device 29 to realize the water body discharge after purification;
the water distribution area 6 of the loading clarification tank is arranged in a through mode of a plurality of channels along the length direction of the water distribution area, at least 2 electric gates 19 are arranged in the channels, and the electric gates 19 are used for controlling the water inflow of the water distribution area of the loading clarification tank;
a coagulation stirring device 20 and a coagulant preparation and adding unit 31 are arranged in the coagulant reaction tank 7; the coagulant preparation and adding unit 31 is used for adding the pumped coagulant into the coagulant reaction tank 7, so that suspended matters in overflowed sewage and positively charged metal salt coagulant are coagulated, destabilization is carried out to form micro flocs, and meanwhile, phosphate in raw water and metal salt form a complex, and the complex is enriched in the micro flocs; the coagulant is positively charged metal salt coagulant; the micro flocs enter a tank body of the loading reaction tank 8 again; the coagulation stirring device 20 is used for stirring and mixing the pumped coagulant;
A loading stirring device is arranged in the tank body of the loading reaction tank 8, and a feeding port for feeding ferroferric oxide particles is also arranged in the tank body of the loading reaction tank 8; the loading stirring device is used for fusing the destabilized micro-flocs with the ferroferric oxide particles, so that the micro-flocs surround the iron particles to form composite flocs; a flocculation stirring device 22 and a flocculant preparation and adding unit 32 are arranged in the flocculant reaction tank 9; the polymeric flocculant pumped by the flocculant preparation and adding unit 32 further enlarges and compacts the composite flocs with the ferroferric oxide particles to form secondary composite flocs through the bridging effect of the polymeric flocculant; the flocculation stirring device 22 is used for stirring the pumped polymeric flocculant;
the loaded sedimentation clarification zone 10 is used for carrying out final mud-water separation treatment on raw water entering the loaded sedimentation clarification zone 10.
Preferably, as an alternative embodiment, the loaded particle concentrator 23, the honeycomb inclined tube device 27 and the clarifier water collecting device 33 are arranged in the loaded sedimentation clarification zone 10;
wherein, the sewage to be subjected to mud-water separation flows down to the bottom of the tank body 10, and the secondary composite flocs containing iron powder particles quickly settle to the bottom of the tank; the loading particle concentrator is used for scraping the secondary composite flocs settled to the bottom of the tank to a bottom center mud bucket, and the flocs without iron powder particles reversely flow to the honeycomb inclined tube device 27 along with the effluent; the honeycomb inclined tube device 27 is used for surrounding the floccules without iron powder particles to increase the area of a sedimentation area, so that the residual micro floccules in the sewage are finally sedimented in the area; a clarifier water collecting device 33 is arranged at the top of the honeycomb inclined tube device 27; the clarifier water collecting device 33 is used for collecting and treating the raw water loaded on the top of the sediment clarification zone 10;
The top of the loading reaction tank 8 is also provided with a loading object separating and adding unit 26; the loading material separating and feeding unit can recycle the iron powder in the iron powder and sludge mixture through the rotation of the magnet turntable, and gravity falls back to the rack inside the loading reaction tank 8 after recycling to finish the recycling of the loading material.
Preferably, as an alternative embodiment, the clarification system 300 further comprises a sludge dewatering zone 11; the loading sediment clarification zone 10 is communicated with the sludge dewatering zone 11, and the sludge dewatering zone 11 is used for receiving sludge discharged by the loading sediment clarification zone 10; a sludge concentrating unit 25 is arranged in the loading sedimentation clarification zone 10; the sludge concentration unit 25 receives the sludge separated by the loading object separation and adding unit 26, carries out concentration treatment on the water content of the sludge, and discharges the concentrated sludge out of the field through a discharge port of the sludge concentration unit 25.
Preferably, as an alternative embodiment, the regulating reservoir further comprises a nitrifying liquid reflux channel 13; one end of the nitrifying liquid backflow channel 13 is communicated with the biological membrane system backflow and effluent distribution area 5, and the other end of the nitrifying liquid backflow channel 13 is communicated with the pre-anoxic tank biological membrane tank 1; the nitrifying liquid backflow channel 13 is used for backflow of sewage which is produced by the biological film system backflow and water outlet distribution area 5 and takes nitrate nitrogen as a main body into the biological film pool 1 of the pre-anoxic pool.
Preferably, as an alternative embodiment, the regulation tank further comprises a facility auxiliary house 12; the equipment auxiliary room 12 is internally provided with a blower unit 30, a coagulant preparation and adding unit 31 and a flocculant preparation and adding unit 32.
Preferably, as an alternative embodiment, the outer edge of the honeycomb chute device 27 is installed by adopting a regular octagon design, the inclined length is 1500mm, the inscribed circle diameter DN80 and the inclined angle of 60 degrees.
Compared with the prior art, the invention has the following beneficial effects: the regulating reservoir comprises a regulating reservoir zone 100, a biomembrane fluidized bed unit 200 and a clarification system 300 from one end to the other end in sequence;
wherein the biofilm fluidized bed unit 200 comprises a plurality of groups of biofilm pools; each group of biological film tanks comprises a pre-anoxic tank biological film tank 1, an anoxic tank biological film tank 2, a pre-aerobic biological film tank 3, an aerobic biological film tank 4, a biological film system reflux and effluent distribution area 5; a pretreatment mesh bag 34 is arranged between the biological film fluidized bed unit 200 and the regulation zone 100 and near the inner side of the biological film fluidized bed unit 200; wherein, the pre-anoxic tank biological film tank 1, the anoxic tank biological film tank 2, the pre-aerobic biological film tank 3, the aerobic biological film tank 4 and the biological film system reflux and water outlet distribution area 5 in each group of biological film tanks are communicated with each other through pipelines in sequence between every two adjacent film tanks according to the arrangement sequence;
A first rapid purification device 28 is arranged on a connecting pipeline between the regulation and storage area 100 and the biological film fluidized bed unit 200; the inlet end of the first rapid purification device 28 is connected to the water outlet of the end of the regulating reservoir in the regulating reservoir area 100, and the water outlet end of the first rapid purification device 28 is connected to the pretreatment mesh bag 34;
wherein polyurethane fluidized bed filler 15 is arranged in the pre-anoxic tank biological film tank 1 and the anoxic tank biological film tank 2, and a biological film anoxic tank circulation stirrer 16 is arranged at the bottoms of the pre-anoxic tank biological film tank 1 and the anoxic tank biological film tank 2; the biomembrane anoxic tank circulation stirrer 16 makes the water flow in the tank body form circulation by adopting a mode of absorbing water at the bottom and uniformly spraying water towards the depth direction of the tank so as to make the polyurethane fluidized bed filling 15 in a fluidized state; the fluidized bed filler interception screen 14 is arranged at the inlet and outlet of different monomer tanks of the pre-anoxic tank biological film tank 1 and the anoxic tank biological film tank 2, and is used for protecting the polyurethane fluidized bed filler 15 from being discharged along with the effluent water, and ensuring the filler filling ratio in the monomer tanks; the pretreatment mesh bag 34 is used for intercepting coarse floaters and preventing the floaters from fouling the fluidized bed filler interception screen 14 in the biological membrane fluidized bed unit 200;
Polyurethane fluidized bed filler 15 and a biological film aerobic tank aeration device 17 are arranged in the pre-aerobic biological film tank 3 and the aerobic biological film tank 4; the air inlet end of the biological film aerobic tank aeration device 17 is connected with a blower unit 30 in the auxiliary equipment room 12; the air outlet end of the biomembrane aerobic tank aeration device 17 is arranged on the bottom surface of the bottom of the tank bottom and is used for extruding the blown air to float from bottom to top so as to realize the suspension state of the polyurethane fluidized bed filler 15;
the clarification system 300 is used for carrying out reduction treatment on SS and TP in the raw water body so as to clarify the water body; the four sections of biological film tanks adopt polyurethane filling 15 as biological film carriers, namely a pre-anoxic tank biological film tank 1, an anoxic tank biological film tank 2, a pre-aerobic biological film tank 3 and an aerobic biological film tank 4.
The combined overflow sewage purification treatment method provided by the invention can obviously improve the sewage purification capability.
Drawings
FIG. 1a is a schematic diagram of a prior art reservoir;
FIG. 1b is a schematic diagram of a prior art reservoir;
FIG. 1c is a schematic diagram of a reservoir according to the prior art;
FIG. 2 is a schematic diagram of a regulating reservoir according to the principles of the present invention;
FIG. 3 is a schematic top plan view of a regulating reservoir according to the present invention;
FIG. 4 is a schematic view of the bottom plan structure of the regulating reservoir according to the present invention;
FIG. 5 is a schematic cross-sectional view of the regulating reservoir in the length direction;
FIG. 6 is a schematic cross-sectional view of the regulating reservoir in the width direction;
FIG. 7 is a schematic cross-sectional view of a unit for separating and adding a load in a regulating reservoir in one direction;
fig. 8 is a schematic diagram of a top planar structure of a loading material separation and addition unit in a regulating reservoir provided by the invention.
Wherein: 1-a biological film pre-anoxic tank; 2-a biomembrane anoxic tank; 3-a biomembrane pre-aerobic tank; 4-a biomembrane aerobic tank; 5-a biofilm system reflux and water outlet distribution area; 6-loading a water distribution area of the clarifier; 7-a coagulant reaction tank; 8-loading a reaction tank; 9-a flocculant reaction tank; 10-loading a precipitation clarification zone; 11-a sludge dewatering zone; 12-a room for auxiliary equipment; 13-nitrifying liquid reflux channel; 14-a fluidized bed packing interception screen; 15-polyurethane fluidized bed packing; 16-a biomembrane anoxic tank circulation stirrer; 17-a biological membrane aerobic tank aeration device; 18-a nitrifying liquid reflux device of a biological film system; 19-an electric gate; 20-a coagulation stirring device; 21-loading a stirring device; 22-flocculation stirring device; 23-loading a particle concentrator; 24-surplus sludge pump group; 25-a sludge concentration unit; 26-separating and adding the loading materials into a unit; 27-honeycomb chute apparatus; 28-a first rapid purification device; 29-a second rapid purification device; 30-blower units; preparing a feeding unit by using 31-coagulant; 32-flocculant preparation and adding units; 33-a clarifier water collection device; 34-pretreatment mesh bag.
Detailed Description
In order that the manner in which the above recited features, objects and advantages of the present invention are obtained will become readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Based on the examples in the embodiments, those skilled in the art can obtain other examples without making any inventive effort, which fall within the scope of the invention. The experimental methods in the following examples are conventional methods unless otherwise specified, and materials, reagents, etc. used in the following examples are commercially available unless otherwise specified.
Example 1
Referring to fig. 2-5, a first embodiment of the present invention provides a regulating reservoir, which performs strengthening treatment on the basis of a CSO regulating reservoir, adds a biomembrane fluidized bed unit 200, a clarification system 300 and auxiliary facilities, adopts an integrated pool type structure design, is integrally embedded into the regulating reservoir structure, and can stably reach three water standards (wherein TN is less than or equal to 10 mg/L) of the surface water environment quality.
The invention provides a regulating reservoir (regulating reservoir), which comprises a regulating reservoir zone 100, a biomembrane fluidized bed unit 200 (namely, a pre-anoxic tank biomembrane tank 1, an anoxic tank biomembrane tank 2, a pre-aerobic biomembrane tank 3 and an aerobic biomembrane tank 4, wherein polyurethane sponge filler is adopted as a biomembrane carrier in the four-section biomembrane tank) and a clarification system 300 from one end to the other end in sequence;
Wherein the biofilm fluidized bed unit 200 comprises a plurality of groups of biofilm pools; each group of biological film tanks comprises a pre-anoxic tank biological film tank 1, an anoxic tank biological film tank 2, a pre-aerobic biological film tank 3, an aerobic biological film tank 4, a biological film system reflux and effluent distribution area 5; a pretreatment mesh bag 34 is arranged between the biological film fluidized bed unit 200 and the regulation zone 100 and near the inner side of the biological film fluidized bed unit 200; wherein, the pre-anoxic tank biological film tank 1, the anoxic tank biological film tank 2, the pre-aerobic biological film tank 3, the aerobic biological film tank 4 and the biological film system reflux and water outlet distribution area 5 in each group of biological film tanks are communicated with each other through pipelines in sequence between every two adjacent film tanks according to the arrangement sequence;
a first rapid purification device 28 is arranged on a connecting pipeline between the regulation and storage area 100 and the biological film fluidized bed unit 200; the inlet end of the first rapid purification device 28 is connected to the water outlet of the end of the regulating reservoir in the regulating reservoir area 100, and the water outlet end of the first rapid purification device 28 is connected to the pretreatment mesh bag 34; the pretreatment mesh bag 34 is used for intercepting coarse floaters and preventing the floaters from fouling the fluidized bed filler interception screen 14 in the biological membrane fluidized bed unit 200;
Wherein polyurethane fluidized bed filler 15 is arranged in the pre-anoxic tank biological film tank 1 and the anoxic tank biological film tank 2, and a biological film anoxic tank circulation stirrer 16 (or biological film pre-anoxic tank circulation stirrer) is arranged at the bottom of the pre-anoxic tank biological film tank 1 and the anoxic tank biological film tank 2; the biomembrane anoxic tank circulation stirrer 16 makes the water flow in the tank body form circulation by adopting a mode of absorbing water at the bottom and uniformly spraying water towards the depth direction of the tank so as to make the polyurethane fluidized bed filling 15 in a fluidized state; the fluidized bed filler interception screen 14 is arranged at the inlet and outlet of different monomer tanks of the pre-anoxic tank biological film tank 1 and the anoxic tank biological film tank 2, and is used for protecting the polyurethane fluidized bed filler 15 from being discharged along with the effluent water, and ensuring the filler filling ratio in the monomer tanks;
polyurethane fluidized bed filler 15 and a biological film aerobic tank aeration device 17 (or biological film pre-aerobic tank aeration device) are arranged in the tanks of the pre-aerobic biological film tank 3 and the aerobic biological film tank 4; the air inlet end of the biological film aerobic tank aeration device 17 is connected with a blower unit 30 in the auxiliary equipment room 12, and the air outlet end of the biological film aerobic tank aeration device 17 is arranged on the bottom surface of the bottom of the tank for extruding the blown air from bottom to top to realize the suspension state of the polyurethane fluidized bed filler 15; (wherein, the air inlet end of the biological film aerobic tank aeration device 17 is connected with a blower unit 30 in the auxiliary equipment room 12, fresh air is blown into the tank body to ensure that the tank bodies of the pre-aerobic biological film tank 3 and the aerobic biological film tank 4 are in an aerobic state, meanwhile, the biological film aerobic tank aeration device 17 adopts a perforated gas distribution mode and is arranged on the bottom surface of the tank bottom, the blown air floats from bottom to top, and can form a shearing action on the polyurethane fluidized bed filling 15 in the process to ensure the suspension state of the device 15);
Overflow water treated by a biomembrane method (namely a pool body of a pre-anoxic pool biomembrane pool 1, an anoxic pool biomembrane pool 2, a pre-aerobic biomembrane pool 3 and an aerobic biomembrane pool 4) finally flows into a biomembrane system reflux and effluent distribution area 5, and a biomembrane system nitrifying liquid reflux device 18 is arranged in the pool body where the biomembrane system reflux and effluent distribution area 5 is positioned; the nitrifying liquid reflux device 18 of the biological film system is used for adjusting nitrifying liquid reflux ratio in the tanks of the pre-aerobic biological film tank 3 and the aerobic biological film tank 4; the biofilm system reflux and effluent distribution area 5 mainly solves the problem of reflux ratio of nitrified liquid after aerobic nitrifying treatment of the tank bodies of the pre-aerobic biofilm tank 3 and the aerobic biofilm tank 4, the biofilm system nitrified liquid reflux device 18 is designed into a micro-power mode, adopts a mode of a plurality of perforated pipes, is fixed (the upper and lower heights of the perforated pipes can be adjusted) at a certain tank depth by using a steel wire rope, and simultaneously, the perforated pipes are introduced with air, and the reflux ratio is controlled by adjusting the air quantity and the upper and lower heights of the perforated pipes, so that the reflux ratio can be between 200% and 1000%. The returned nitrifying liquid flows back to the inside of the biological membrane tank 1 of the pre-anoxic tank through the nitrifying liquid return channel 13 positioned at the top of the tank body;
The clarification system 300 is used for carrying out reduction treatment on SS and TP in the raw water body so as to clarify the water body; the four sections of biological film tanks adopt polyurethane filling 15 as biological film carriers, namely a pre-anoxic tank biological film tank 1, an anoxic tank biological film tank 2, a pre-aerobic biological film tank 3 and an aerobic biological film tank 4.
Preferably, as an alternative embodiment, the clarification system 300 comprises a loaded clarifier water distribution zone 6, a coagulant reaction tank 7, a loaded reaction tank 8, a flocculant reaction tank 9, and a loaded sediment clarification zone 10; the water distribution area 6 of the loading clarifying tank, the coagulant reaction tank 7, the loading reaction tank 8, the flocculant reaction tank 9 and the loading sedimentation clarifying area 10 are communicated with each other through pipelines in sequence every two adjacent areas according to the arrangement sequence; the water outlet end of the loading sedimentation clarification zone 10 is connected with a second rapid purification device 29 to realize the water body discharge after purification;
the water distribution area 6 of the loading clarification tank is arranged in a through mode of a plurality of channels along the length direction of the water distribution area, at least 2 electric gates 19 are arranged in the channels, and the electric gates 19 are used for controlling the water inflow of the water distribution area of the loading clarification tank;
a coagulation stirring device 20 and a coagulant preparation and adding unit 31 are arranged in the coagulant reaction tank 7; the coagulant preparation and adding unit 31 is used for adding the pumped coagulant into the coagulant reaction tank 7, so that suspended matters in overflowed sewage and positively charged metal salt coagulant are coagulated, destabilization is carried out to form micro flocs, and meanwhile, phosphate in raw water and metal salt form a complex, and the complex is enriched in the micro flocs; the coagulant is positively charged metal salt coagulant; the micro flocs enter a tank body of the loading reaction tank 8 again; the coagulation stirring device 20 is used for stirring and mixing the pumped coagulant;
A loading stirring device is arranged in the tank body of the loading reaction tank 8, and a feeding port for feeding 100-mesh ferroferric oxide particles is also arranged in the tank body of the loading reaction tank 8; the loading stirring device is used for fusing the destabilized micro-flocs with the ferroferric oxide particles, so that the micro-flocs surround the iron particles to form composite flocs; (meanwhile, 100 meshes of ferroferric oxide particle medium is added into the tank body, and the micro flocs after destabilization are fused with the ferroferric oxide particles through the action of a stirring device, so that the micro flocs surround the iron particles)
A flocculation stirring device 22 and a flocculant preparation and adding unit 32 are arranged in the flocculant reaction tank 9; the polymeric flocculant pumped by the flocculant preparation and adding unit 32 further enlarges and compacts the composite flocs with the ferroferric oxide particles through the bridging effect of the polymeric flocculant; the flocculation stirring device 22 is used for stirring the pumped polymeric flocculant; the composite floccules enter the flocculant reaction tank 9 again, a flocculation stirring device 22 is arranged in the flocculant reaction tank 9, and meanwhile, a polymeric flocculant pumped by a flocculant preparation and feeding unit 32 is fed, and the floccules with ferroferric oxide particles are further enlarged and further compacted to form secondary composite floccules through the bridging effect of the polymeric flocculant;
The loaded sedimentation clarification zone 10 is used for carrying out final mud-water separation treatment on raw water entering the loaded sedimentation clarification zone 10.
Preferably, as an alternative embodiment, the loaded particle concentrator 23, the honeycomb inclined tube device 27 and the clarifier water collecting device 33 are arranged in the loaded sedimentation clarification zone 10;
wherein, the sewage to be subjected to mud-water separation flows down to the bottom of the tank body 10, and the secondary composite flocs containing iron powder particles quickly settle to the bottom of the tank; the loading particle concentrator is used for scraping the secondary composite flocs settled to the bottom of the tank to a bottom center mud bucket, and the flocs without iron powder particles reversely flow to the honeycomb inclined tube device 27 along with the effluent; the outer edge of the honeycomb inclined tube device 27 is arranged by adopting a regular octagon design, the inclined length is 1500mm, the inscribed circle diameter DN80 and the inclined angle of 60 degrees, the area of a sedimentation area can be increased by adopting the mode, and the residual micro flocs in the sewage are finally sedimentated in the area; a clarifier water collecting device 33 is arranged at the top of the honeycomb inclined tube device 27;
the clarifier water collecting device 33 is used for collecting and treating the raw water loaded on the top of the settling clarification zone 10, and the clarifier water collecting device 33 finally discharges the collected water to the second rapid purification device 29 through a channel and then flows out of the system;
The sewage to be subjected to mud-water separation flows down to the bottom of the tank body 10, at the moment, the floccules containing iron powder particles quickly settle to the bottom of the tank, the floccules are scraped to the bottom center mud bucket by the loading particle concentrator 23, the floccules without the iron powder particles reversely flow to the honeycomb inclined tube device 27 along with the effluent, the honeycomb inclined tube is installed by adopting a regular octagon design, the inclined length is 1500mm, the inscribed circle diameter DN80 and the inclined angle of 60 degrees, the area of a sedimentation area can be enlarged by adopting the mode, and the residual micro floccules in the sewage are finally sedimentated in the area; the water collecting device of the 33-clarification tank is designed at the top of the tank body 10, 6 groups of water collecting devices are arranged in a single-group clarification tank, the water collecting devices are manufactured by adopting a glass fiber reinforced plastic integrated forming process and are designed to be in a water tank form with the width of 300mm and the height of 350mm, and the top of the water tank is provided with a weir plate in an adjustable form, so that the water collecting quantity of all water collecting tanks can be ensured to be kept consistent. Finally, the water treated by the loading clarification tank is discharged into a nearby river channel through a second rapid purification device 29, and all pollutants are effectively removed at the moment;
the loaded material ferroferric oxide is added into the loading clarifier, the sludge flocs can be settled rapidly, the floor area of the tank body 10 is reduced, meanwhile, in order to avoid discharging the loaded material along with the discharged sludge, the cyclic operation of the loaded material in the loading clarifier is ensured, and a loaded material separating and adding unit 26 is designed and positioned at the top 8 of the loading reaction tank. The iron powder and sludge mixture in the sludge hopper at the bottom of the tank body 10 is pumped into a loading object separating and adding unit 26 under the action of a surplus sludge pump set 24, and the loading object separating and adding unit 26 can recycle the iron powder in the iron powder and sludge mixture through the rotation of a magnet turntable, and gravity falls back into the loading reaction tank 8 after recycling, so that the recycling of the loading object is completed. The loading material separating and feeding unit 26 is composed of an iron powder loading material bin 261, an iron powder recycling machine 262, a loading material quantitative feeding screw 263, a material supplementing and recycling communicating vessel 264, an integrated bracket and the like 265. The iron powder loading material bin 261 can store the needed supplementary loading material amount for 7-10 days, and the automatic supplementary feeding work is realized through the loading material quantitative feeding screw 263.
The sludge separated by the loading material separation and feeding unit 26 flows to the sludge concentration unit 25 by gravity, the sludge with the water content of 97% can be concentrated to be less than 80%, the concentration unit is positioned at the top of the tank body 10, and the dehydrated sludge can be subjected to off-site treatment by a transport vehicle;
preferably, as an alternative embodiment, the clarification system 300 further comprises a sludge dewatering zone 11; the loading sediment clarification zone 10 is communicated with the sludge dewatering zone 11, and the sludge dewatering zone 11 is used for receiving sludge discharged by the loading sediment clarification zone 10; a sludge concentrating unit 25 is arranged in the loading sedimentation clarification zone 10; the sludge concentration unit 25 receives the sludge separated by the loading object separation and adding unit 26, carries out concentration treatment on the water content of the sludge, and discharges the concentrated sludge out of the field through a discharge port of the sludge concentration unit 25.
Preferably, as an alternative embodiment, the regulating reservoir further comprises a nitrifying liquid reflux channel 13; one end of the nitrifying liquid backflow channel 13 is communicated with the biological membrane system backflow and effluent distribution area 5, and the other end of the nitrifying liquid backflow channel 13 is communicated with the pre-anoxic tank biological membrane tank 1; the nitrifying liquid backflow channel 13 is used for backflow of sewage which is produced by the biological film system backflow and water outlet distribution area 5 and takes nitrate nitrogen as a main body into the biological film pool 1 of the pre-anoxic pool.
Preferably, as an alternative embodiment, the regulation tank further comprises a facility auxiliary house 12; the equipment auxiliary room 12 is internally provided with a blower unit 30, a coagulant preparation and adding unit 31 and a flocculant preparation and adding unit 32.
The auxiliary room 12 is internally provided with a blower unit 30, a coagulant preparation and adding unit 31 and a flocculant preparation and adding unit 32, and can store a certain amount of medicaments.
Preferably, as an alternative embodiment, the outer edge of the honeycomb chute device 27 is installed by adopting a regular octagon design, the inclined length is 1500mm, the inscribed circle diameter DN80 and the inclined angle of 60 degrees.
In summary, the combined overflow sewage is subjected to two-stage treatment process, firstly subjected to biological treatment by an aerobic-lack biological membrane fluidized bed unit, and then subjected to coagulation strengthening treatment by loading coagulation sedimentation clarification:
1. a deficient aerobic biomembrane fluidized bed unit: the biological film fluidized bed unit consists of a (pre) anoxic tank biological film tank and a (pre) aerobic biological film tank, wherein the four sections of biological film tanks all adopt polyurethane sponge filler as biological film carriers, a fluidized state is formed in a monomer tank, and the biological metabolism activities of various microorganisms in the suspended filler biological film are utilized to remove pollutants in overflow sewage.
The water flow sequentially circulates from left to right, and the pre-anoxic biological membrane tank 1 is mainly added with the specific surface area 2800-3200m 2 /m 3 Polyurethane filler, filling rate 50%, and pool DO about 0.5-0.8mg/L (reflux nitrifying liquid amount control by end aerobic biomembrane pool), mixing raw water, reflux nitrifying liquid and suspended filler by built-in submerged circulation stirrer, and mainly enriching and growing anoxic denitrification flora and partial small amount of aerobic nitrifying flora to complete the process of converting nitrate nitrogen into nitrogen;
the water flow passes through the anoxic tank biological film tank 2 again, and the specific surface area of the tank is mainly 2800-3200m 2 /m 3 Polyurethane filler, filling rate 50%, pool DO control below 0.5mg/L, at the same time, built-in submerged circulation type agitator mixes raw water, suspended filler, mainly enrich and grow denitrifying flora and some little anaerobic ammonia oxidation flora (wherein anaerobic ammonia oxidation flora is mainly enriched in filler), in this stage, nitrate nitrogen in overflowed sewage is converted into nitrogen, reduce nitrate nitrogen to the minimum level, at this stage, meanwhile, organic phosphorus in overflowed water is completely converted into inorganic phosphorus, have made the bedding for the depth dephosphorization of the subsequent loading coagulation precipitation;
the water flow passes through a biological membrane tank 3 of the pre-aerobic tank, and the specific surface area of the tank is mainly 2800-3200m 2 /m 3 Polyurethane filler, filling rate of 30%, controlling pool DO below 2.0mg/L, controlling pool DO and filler fluidization state by bottom exclusive design aeration pipe, and filling main enriching and growing aerobic microorganism flora to complete residual organic carbon removal, ammonia nitrogen nitration and partial denitrification (due to special structure of polyurethane filler, forming dissolved oxygen gradient inside)The surface layer is a pure aerobic layer, oxygen in the biomembrane can be influenced by mass transfer resistance, DO in the filler is lower to form a certain anoxic environment, and the synchronous nitrification and denitrification phenomenon can occur due to the existence of the microcosmic aerobic-anoxic/anaerobic environment;
the water flow passes through an aerobic biomembrane pool 4, and the specific surface area 2800-3200m is mainly added in the pool 2 /m 3 Polyurethane filler, filling rate of 30%, and pool DO of 3.0-4.0mg/L, wherein the pool DO and filler fluidization state are controlled by the dedicated design of aeration pipe at bottom, the filler mainly enriches and grows aerobic microorganism flora, COD and BOD in overflow sewage are reduced to minimum level by high-flow oxygenation and filler fluidization high circulation, and simultaneously the nitrification process of ammonia nitrogen is thoroughly completed.
The water flow finally flows through a biofilm system reflux and effluent distribution area, 200% -1000% of sewage can be subjected to nitrifying liquid reflux treatment, wherein when the concentration of raw water pollutants is high or a large amount of toxic organic pollutants exist, the 1000% of reflux can dilute the raw water in a large proportion, so that toxic damage to the biofilm system is avoided (the combined overflow sewage can be in the initial stage of heavy rain, and the ground flushing can cause toxic pollutants with high concentration).
The embodiment of the invention provides a method for purifying and treating sewage overflowed by a confluence system, which adopts the regulating reservoir in the embodiment and comprises the following operation steps:
step S1, starting a first rapid purification device 28 to perform initial purification treatment on raw water flowing into a tank body of the biological membrane fluidized bed unit 200 from the regulation and storage area 100, and performing interception treatment on the raw water by a pretreatment mesh bag 34;
step S2, sewage to be treated by the pretreatment mesh bag 34 sequentially enters a biological film pre-anoxic tank 1, a biological film anoxic tank 2, a biological film pre-aerobic tank 3, a biological film aerobic tank 4 and a biological film system reflux and water outlet distribution area 5; the biological film anoxic tank circulation agitators 16 in the biological film anoxic tank 1 and the biological film anoxic tank 2 adopt a mode of absorbing water at the bottom and spraying water uniformly towards the deep direction of the tank to form circulation in the tank body so as to enable the polyurethane fluidized bed filling 15 to be in a fluidized state; the biological film aerobic tank aeration devices 17 in the tanks of the pre-aerobic biological film tank 3 and the aerobic biological film tank 4 are started; the aeration device 17 of the biomembrane aerobic tank extrudes the blown air from bottom to top to realize the suspension state of the polyurethane fluidized bed filler 15;
step S3, overflow water treated by a biomembrane method through a biomembrane pre-anoxic tank 1, a biomembrane anoxic tank 2, a biomembrane pre-aerobic tank 3 and a biomembrane aerobic tank 4 finally flows into a biomembrane system reflux and effluent distribution area 5, and a biomembrane system nitrifying liquid reflux device 18 is arranged in the tank; the nitrifying liquid reflux device 18 of the biological film system adjusts nitrifying liquid reflux ratios in the tanks of the pre-aerobic biological film tank 3 and the aerobic biological film tank 4;
S4, controlling the water inflow of the water distribution area of the loading clarification tank by an electric gate 19 of the water distribution area 6 of the loading clarification tank;
s5, adding a pumped coagulant into the coagulant reaction tank 7 by a coagulant preparation adding unit 31 in the tank body of the coagulant reaction tank 7 to coagulate suspended matters in overflowed sewage and positively charged metal salt coagulant, and performing destabilization to form micro flocs, wherein phosphate in raw water and metal salt form a complex, and the complex is enriched in the micro flocs; the coagulant is positively charged metal salt coagulant; the coagulation stirring device 20 in the tank body of the coagulant reaction tank 7 stirs and mixes the pumped coagulant;
s6, a loading stirring device in a tank body of the loading reaction tank 8 is used for fusing the 'destabilized' micro-flocs with the ferroferric oxide particles, so that the micro-flocs surround the iron particles to form composite flocs;
step S7, preparing a polymeric flocculant pumped by a feeding unit 32 from a flocculant in a flocculant reaction tank 9, and further enlarging and compacting the composite flocs with the ferroferric oxide particles to form secondary composite flocs through the bridging effect of the polymeric flocculant; the flocculation stirring device 22 is used for stirring the pumped polymeric flocculant;
The loaded sedimentation clarification zone 10 carries out final mud-water separation treatment on the raw water entering the loaded sedimentation clarification zone 10.
Compared with the prior art, the method for purifying and treating the sewage by the combined overflow provided by the embodiment of the invention has the technical advantages that:
(1) the purification device is embedded in the regulation and storage tank, and can reach the discharge standard after being treated, and overflow sewage is not required to be pumped to a town sewage treatment plant for treatment (for example, the town sewage treatment plant can accept part of overflow sewage), so that the risk of water quality substandard caused by the increase of water yield load of the sewage treatment plant can be reduced;
(2) the purification device is embedded in the regulation and storage tank, and can reach the discharge standard after being treated, so that a new sewage treatment facility (such as the existing urban sewage treatment plant can not accept the existing overflow sewage) is not needed, and the construction land investment and the engineering construction investment are reduced;
(3) the purification device is embedded in the regulation and storage tank, and can reach the discharge standard after being treated, and pumping to a town sewage treatment plant for treatment is not needed, so that a new pressure pipeline is not needed, and a large amount of construction cost is saved;
(4) according to the invention, all process treatment facilities and auxiliary facilities are integrated into a whole, a newly built building is not required to be considered outside the regulating and storing pool, and the occupied area is saved;
(5) The invention adds a unique biomembrane biochemical treatment unit, synchronously removes COD, TN, NH-N and other pollutant indexes, and can directly drain the effluent by combining with a subsequent loading clarifier;
(6) the invention adopts the design of a loading clarification tank, the sedimentation process of pollutant flocs is faster, the concentration of effluent suspended matters is lower, the concentration of effluent suspended matters can be stabilized below 10mg/L, and a subsequent filtering unit is not needed; and the impact load resistance is strong, and the device is suitable for occasions with large operation and maintenance water quantity change amplitude.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A regulation pond, its characterized in that: comprises a regulating and accumulating area, a biomembrane fluidized bed unit and a clarification system from one end to the other end in sequence;
Wherein the biofilm fluidization bed unit comprises a plurality of groups of biofilm pools; each group of the biological film tanks comprise a pre-anoxic tank biological film tank, an anoxic tank biological film tank, a pre-aerobic biological film tank, an aerobic biological film tank and a biological film system reflux and water outlet distribution area; a pretreatment mesh bag is arranged between the biological film fluidized bed unit and the regulation area and close to the inner side of the biological film fluidized bed unit; wherein, the pre-anoxic tank biological film tank, the pre-aerobic biological film tank, the aerobic biological film tank and the biological film system reflux in each group of biological film tanks are communicated with each other through pipelines in sequence every two adjacent film tanks in the arrangement sequence;
a first rapid purification device is arranged on a connecting pipeline between the regulation and storage area and the biomembrane fluidized bed unit; the inlet end of the first rapid purification device is connected with the water outlet of the tail end of the regulating reservoir in the regulating reservoir, and the water outlet end of the first rapid purification device is connected with the pretreatment mesh bag;
wherein polyurethane fluidized bed filler is arranged in the pre-anoxic tank biological film tank and the anoxic tank biological film tank, and a biological film anoxic tank circulation stirrer is arranged at the bottoms of the pre-anoxic tank biological film tank and the anoxic tank biological film tank; the biomembrane anoxic tank circulation stirrer is used for enabling water flow in the tank body to form circulation by adopting a mode of absorbing water at the bottom and uniformly spraying water towards the deep direction of the tank so as to enable polyurethane fluidized bed filler to be in a fluidized state; the fluidized bed filler interception screen is arranged at the inlet and the outlet of different monomer tank bodies of the pre-anoxic tank biological film tank and the anoxic tank biological film tank, so as to protect the polyurethane fluidized bed filler from being discharged along with water outlet and ensure the filler filling ratio in the monomer tank body; the pretreatment mesh bag is used for intercepting coarse floaters and preventing the floaters from fouling a fluidized bed filler interception screen in the biomembrane fluidized bed unit;
Polyurethane fluidized bed filler and a biological film aerobic tank aeration device are arranged in the pre-aerobic biological film tank and the tank body of the aerobic biological film tank; the air inlet end of the biological film aerobic tank aeration device is connected with a blower unit in an auxiliary equipment room; the air outlet end of the biological film aerobic tank aeration device is arranged on the bottom surface of the bottom of the tank bottom and is used for extruding the blown air to float from bottom to top so as to realize the suspension state of the polyurethane fluidized bed filler 15;
the clarification system is used for carrying out reduction treatment on SS and TP in the raw water body so as to clarify the water body; the four sections of biological film tanks adopt polyurethane filling materials as biological film carriers.
2. The regulation reservoir of claim 1, wherein: the clarification system comprises a water distribution area of a loading clarification tank, a coagulant reaction tank, a loading reaction tank, a flocculant reaction tank and a loading sedimentation clarification area; the water distribution area of the loading clarifying tank, the coagulant reaction tank, the loading reaction tank, the flocculant reaction tank and the loading sedimentation clarifying area are communicated with each other through pipelines in sequence every two adjacent areas according to the arrangement sequence; the water outlet end of the loading sedimentation clarification zone is connected with a second rapid purification device to realize the water body discharge after purification;
The water distribution area of the loading clarification tank is arranged in a through mode of a plurality of channels along the length direction of the water distribution area of the loading clarification tank, and at least one electric gate is arranged in each channel and used for controlling the water inflow of the water distribution area of the loading clarification tank;
a coagulation stirring device and a coagulant preparation and addition unit are arranged in the coagulant reaction tank; the coagulant preparation and adding unit is used for adding the pumped coagulant into the coagulant reaction tank, so that suspended matters in overflowed sewage and positively charged metal salt coagulant are coagulated, destabilization is carried out to form micro flocs, and meanwhile, phosphate in raw water and metal salt form a complex, and the complex is enriched in the micro flocs; the coagulant is positively charged metal salt coagulant; the micro flocs enter a tank body of a loading reaction tank again; the coagulation stirring device is used for stirring and mixing the pumped coagulant;
a loading stirring device is arranged in the tank body of the loading reaction tank, and a feeding port for feeding ferroferric oxide particles is also arranged in the tank body of the loading reaction tank; the loading stirring device is used for fusing the destabilized micro-flocs with the ferroferric oxide particles, so that the micro-flocs surround the iron particles to form composite flocs; a flocculation stirring device and a flocculant preparation and adding unit are arranged in the tank body of the flocculant reaction tank; the polymer flocculant pumped by the flocculant preparation adding unit is further enlarged and compacted to form secondary composite flocs by the bridging effect of the polymer flocculant; the flocculation stirring device is used for stirring the pumped polymeric flocculant;
The loading sedimentation clarification zone is used for carrying out final mud-water separation treatment on the raw water entering the loading sedimentation clarification zone.
3. The regulation reservoir of claim 2, wherein: a loading particle concentrator, a honeycomb inclined tube device and a clarifier water collecting device are arranged in the loading sedimentation clarification area;
wherein, the sewage to be subjected to mud-water separation flows down to the bottom of the tank body, and the secondary composite flocs containing iron powder particles quickly settle to the bottom of the tank; the loading particle concentrator is used for scraping the secondary composite flocs which settle to the bottom of the tank to a bottom center mud bucket, and the flocs which do not contain iron powder particles reversely flow to the honeycomb inclined tube device along with the effluent; the honeycomb inclined tube device is used for surrounding the floccules without iron powder particles to increase the area of a sedimentation area, so that the residual micro floccules in the sewage are subjected to final sedimentation in the area; a clarifier water collecting device is arranged at the top of the honeycomb inclined tube device; the clarifier water collecting device is used for collecting and treating raw water at the top in the loaded sedimentation clarifier zone;
the top of the loading reaction tank is also provided with a loading object separating and adding unit; the loading material separating and feeding unit can recycle the iron powder in the iron powder and sludge mixture through the rotation of the magnet turntable, and gravity falls back to the interior of the loading reaction tank after recycling to finish the recycling of the loading material.
4. A regulating reservoir according to claim 3, characterized in that: the clarification system also comprises a sludge dewatering zone; the loading sedimentation clarification zone is communicated with the sludge dewatering zone, and the sludge dewatering zone is used for receiving sludge discharged by the loading sedimentation clarification zone; a sludge concentration unit is arranged in the loading sedimentation clarification area; the sludge concentration unit receives the sludge separated by the loading object separation and feeding unit, carries out concentration treatment on the water content of the sludge, and discharges the concentrated sludge out of the field through a discharge port of the sludge concentration unit.
5. A regulating reservoir according to claim 3, characterized in that: the regulating reservoir also comprises a nitrifying liquid backflow channel; one end of the nitrifying liquid backflow channel is communicated with the biological membrane system backflow and effluent distribution area, and the other end of the nitrifying liquid backflow channel is communicated with the pre-anoxic tank biological membrane tank; the nitrifying liquid backflow channel is used for backflow of sewage which is produced by the biological film system backflow and water outlet distribution area and takes nitrate nitrogen as a main body into the biological film pool of the pre-anoxic pool.
6. The regulation reservoir of claim 4, wherein: the regulating reservoir also comprises an equipment auxiliary room; the auxiliary room of the equipment is internally provided with a blower unit, a coagulant preparation and adding unit and a flocculant preparation and adding unit.
7. The regulation reservoir of claim 2, wherein: the outer edge of the honeycomb inclined tube device adopts a regular octagon shape.
8. A method for purifying sewage by confluence overflow is characterized in that: use of a regulating reservoir according to any of claims 1-6, comprising the following operating steps:
step S1, starting a first rapid purification device to perform initial purification treatment on raw water flowing into a tank body of a biological film fluidized bed unit from a regulation area, and performing interception treatment on a pretreatment mesh bag;
step S2, sewage to be treated by the pretreatment mesh bag sequentially enters a biological film pre-anoxic tank, a biological film pre-aerobic tank, a biological film aerobic tank and a biological film system reflux and outlet water distribution area; the biological film pre-anoxic tank and a biological film anoxic tank circulation stirrer in the biological film pre-anoxic tank adopt a mode of absorbing water at the bottom and uniformly spraying water towards the deep direction of the tank to form circulation in the tank body so as to enable the polyurethane fluidized bed filler to be in a fluidized state; the aeration device of the biological film aerobic tank in the tank body of the pre-aerobic biological film tank is started; the aeration device of the biomembrane aerobic tank extrudes the air blown in from bottom to top to realize the suspension state of polyurethane fluidized bed filler;
Step S3, overflow water treated by a biomembrane method through a biomembrane pre-anoxic tank, a biomembrane pre-aerobic tank and a biomembrane aerobic tank finally flows into a biomembrane system reflux and effluent distribution area, and a biomembrane system nitrifying liquid reflux device is arranged in the tank; the nitrifying liquid reflux device of the biological film system adjusts the nitrifying liquid reflux ratio in the tank body of the pre-aerobic biological film tank and the aerobic biological film tank;
s4, controlling the water inflow of the water distribution area of the loading clarification tank by an electric gate of the water distribution area of the loading clarification tank;
s5, adding the pumped coagulant into the coagulant reaction tank by a coagulant preparation adding unit in the tank body of the coagulant reaction tank, condensing suspended matters in overflowed sewage and positively charged metal salt coagulant, performing destabilization to form micro flocs, forming a complex by phosphate in raw water and metal salt, and enriching the complex in the micro flocs; the coagulant is positively charged metal salt coagulant; the coagulation stirring device in the tank body of the coagulant reaction tank stirs and mixes the pumped coagulant;
s6, a loading stirring device in a tank body of the loading reaction tank is used for fusing the 'destabilized' micro-flocs with the ferroferric oxide particles, so that the micro-flocs surround the iron particles to form composite flocs;
S7, preparing a polymeric flocculant pumped by a feeding unit from a flocculant in a tank body of the flocculant reaction tank, and further enlarging and compacting the composite flocs with the ferroferric oxide particles to form secondary composite flocs through the bridging effect of the polymeric flocculant; the flocculation stirring device is used for stirring the pumped polymeric flocculant; and the loading sedimentation clarification zone performs final mud-water separation treatment on the raw water entering the loading sedimentation clarification zone.
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