CN116102199A - Low-dissolved-oxygen sewage treatment system and method - Google Patents
Low-dissolved-oxygen sewage treatment system and method Download PDFInfo
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- CN116102199A CN116102199A CN202211607242.8A CN202211607242A CN116102199A CN 116102199 A CN116102199 A CN 116102199A CN 202211607242 A CN202211607242 A CN 202211607242A CN 116102199 A CN116102199 A CN 116102199A
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- 239000001301 oxygen Substances 0.000 title claims abstract description 125
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 125
- 239000010865 sewage Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 101
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 83
- 239000010802 sludge Substances 0.000 claims abstract description 65
- 238000010992 reflux Methods 0.000 claims abstract description 57
- 238000005273 aeration Methods 0.000 claims abstract description 53
- 238000005352 clarification Methods 0.000 claims abstract description 31
- 206010021143 Hypoxia Diseases 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims abstract description 11
- 230000007954 hypoxia Effects 0.000 claims abstract description 11
- 239000006228 supernatant Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 15
- 238000005422 blasting Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 8
- 210000005056 cell body Anatomy 0.000 claims description 7
- 239000011259 mixed solution Substances 0.000 claims description 7
- 238000005276 aerator Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000004065 wastewater treatment Methods 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 9
- 229910052799 carbon Inorganic materials 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 9
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 230000001360 synchronised effect Effects 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000008235 industrial water Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000010841 municipal wastewater Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/043—Treatment of partial or bypass streams
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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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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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention belongs to the technical field of sewage treatment, and discloses a low-dissolved-oxygen sewage treatment system and a method. The system comprises a device control zone, a low oxygen zone, a stripping zone, a clarification zone and a reflux zone. The sewage enters a low-oxygen area, an aeration pipe is arranged in the low-oxygen area, and a blower oxygenates the low-oxygen area through the aeration pipe. The rear end of the low oxygen area is provided with a gas stripping area, and sewage at the rear end of the low oxygen area is lifted to the front end of the low oxygen area through an air lifter. The sludge mixed liquor enters the clarification zone after passing through the gas stripping zone, the supernatant fluid flows into the upper water receiving weir from bottom to top, and the sludge is lifted to the front end of the hypoxia zone by a reflux pump at the rear end of the clarification zone. The invention controls the dissolved oxygen concentration in the low oxygen area in a lower range, can realize synchronous nitrification and denitrification of the system, simplifies the process, effectively improves the utilization rate of the carbon source in the raw water, and reduces the addition amount of the carbon source. The system and the method have the characteristics of small occupied area, simple system operation, high automation degree, low energy consumption and the like.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a low-dissolved-oxygen sewage treatment system and a method.
Background
At present, the construction of a rapid sewage treatment plant brings about a great demand for sewage treatment operation resources. Along with the increasing of town speed and the construction of a large number of sewage treatment plants, the prior professional operation and maintenance teams cannot meet the requirement of increasing operation and maintenance capability. Especially in small and medium-sized sewage treatment plants with large proportion, the operation and maintenance units can hardly find professional operation and maintenance personnel. The main reasons for unstable operation of most sewage treatment plants at present are insufficient operation strength, and besides, the reasons for mixing industrial water, large fluctuation of water quality of inflow water, insufficient carbon source of inflow water, complex process design and the like are also included.
Currently, municipal wastewater treatment processes put into operation include oxidation, A2/O processes, activated sludge process, SBR and the like. The existing sewage treatment process has the following defects: firstly, the utilization rate of the carbon source of the inlet water is not high, so that an additional carbon source is added; secondly, the degree of automation is not high, and professional operation and maintenance team is required; thirdly, the impact load resistance is weak, and the stable standard is difficult to achieve under the condition of fluctuation of the quality of the incoming water.
Therefore, a system with low energy consumption, high automation degree and impact load resistance and a sewage treatment process are needed to be provided at present, and the problems of long process flow, low automation degree, frequent mixing of industrial sewage in water inflow and the like of the existing small and medium-sized sewage treatment plants are solved, so that the increasingly strict requirements on water environment supervision are met.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art and provides a low-dissolved-oxygen sewage treatment system and a low-dissolved-oxygen sewage treatment method. The invention controls the dissolved oxygen concentration in the low oxygen area in a lower range, can realize synchronous nitrification and denitrification of the system, simplifies the process, effectively improves the utilization rate of the carbon source in the raw water, and reduces the addition amount of the carbon source. The system and the method have the characteristics of small occupied area, simple system operation, high automation degree, low energy consumption and the like.
In order to achieve the above objects, in one aspect, the present invention provides a low dissolved oxygen sewage treatment system comprising an apparatus control zone, a low oxygen zone, a stripping zone, a clarification zone, and a reflux zone;
the equipment control area comprises a blower, a variable frequency control device and an oxygen dissolving instrument; one end of the oxygen dissolving instrument is connected with the variable frequency control device, and the other end of the oxygen dissolving instrument is arranged in the low oxygen area; one end of the blower is connected with the variable frequency control device;
the low oxygen area comprises a low oxygen area tank body, a water distribution device, a haulage rope, a guide groove, an aeration pipe, a blast branch pipe, a diverter valve and an air inlet pipe; the water distribution device is arranged above the low-oxygen area tank body and is used for uniformly feeding water into the low-oxygen area tank body; the guide groove is arranged at the bottom of the low-oxygen area tank body, and the aeration pipe is arranged in the guide groove; one end of the haulage rope is fixedly connected with the low oxygen area tank body, and the other end of the haulage rope is sequentially connected with the aeration pipe, the blast branch pipe, the diverter valve and the air outlet of the air inlet pipe;
the air stripping zone comprises a pool body of the air stripping zone, an air lifter, an air stripping air pipe, a sewage return pipe and a reflux groove; the air lifter is arranged in the gas stripping zone tank body, the air outlet of the gas stripping air pipe is connected with the air lifter, the air lifter is used for conveying sewage in the gas stripping zone tank body into the water inlet of the reflux tank through the sewage reflux pipe, and the water outlet of the reflux tank is arranged at the front end of the hypoxia zone tank body;
the other end of the air blower is connected with the air inlet of the air inlet pipe and the air inlet of the stripping air pipe;
the clarification zone comprises a clarification zone tank body, a bottom water inlet, an inclined tube group and a water receiving weir; the bottom water inlet is arranged at the bottom of the wall of the pond between the stripping zone and the clarifying zone; the water receiving weir is arranged above the inclined tube group, and the inclined tube group and the water receiving weir are used for realizing solid-liquid separation of the sludge mixed liquid in the clarification area;
a mud inlet is formed in the bottom of the wall of the pond body between the backflow area and the clarification area; the reflux zone comprises a reflux pump and a sludge reflux pipe, one end of the sludge reflux pipe is connected with the reflux pump, and the other end of the sludge reflux pipe is connected with a water inlet of the reflux groove.
According to the present invention, preferably,
the water distribution device comprises a water inlet pipe, a water distribution weir and a horizontal regulator;
the water inlet pipe is arranged above the water distribution weir;
the horizontal regulator is used for horizontally fixing the water distribution weir in the hypoxia zone.
According to the invention, the water distribution weir is preferably a saw-tooth stainless steel water distribution weir, the height of the weir plate is 15-25cm, and the opening depth is 10-20cm.
According to the present invention, preferably,
the aeration pipes comprise single aeration pipes and double aeration pipes;
the blast branch pipes comprise singular blast branch pipes and even blast branch pipes;
the diverter valve comprises a singular diverter valve and a double diverter valve;
the other end of the traction rope is respectively connected with one end of the single aerator pipe and one end of the double aerator pipes; the other end of the singular aeration pipe is sequentially connected with a singular blasting branch pipe and a singular diverter valve; the other end of the double-number aeration pipe is sequentially connected with a double-number blasting branch pipe and a double-number flow dividing valve;
and the single-number diverter valve and the double-number diverter valve are both connected with the air outlet of the air inlet pipe.
In the present invention, as a preferable scheme, both the singular diverter valve and the double diverter valve are opened during normal aeration.
According to the invention, preferably, the single aeration pipe and the double aeration pipes are strip hoses made of PU materials, and the widths of the hoses are respectively and independently 60-70mm.
According to the present invention, preferably, the single aeration pipe and the double aeration pipe are arranged at a pitch of 5-20cm.
According to the present invention, preferably, the tube-set for inclined tubes includes a plurality of inclined tubes, the interval between the inclined tubes is 45-55mm, and the length of each inclined tube is 0.5-1.5m.
According to the invention, preferably, the clarification zone comprises an upper clear water layer having a height of 0.5-1m and a lower sludge layer having a height of 0.5-1.5m.
In another aspect, the invention provides a method for treating sewage with low dissolved oxygen, which adopts the system and comprises the following steps:
adding activated sludge into the low-oxygen area tank body; evenly feeding water into the low-oxygen area tank body through the water distribution device; controlling the concentration of dissolved oxygen in the low-oxygen area cell body through the equipment control area;
in the stripping zone, the sludge mixed liquor entering the tank body of the stripping zone is refluxed to the front end of the tank body of the hypoxia zone through the sewage reflux pipe by virtue of the stripping action;
in the clarification area, solid-liquid separation of the sludge mixed solution is realized by utilizing a shallow pool principle, so as to obtain precipitated sludge and supernatant, wherein the precipitated sludge enters the reflux area through the sludge inlet, and the supernatant is discharged out of the system through the water receiving weir;
in the reflux zone, the precipitated sludge is refluxed to the front end of the low-oxygen zone tank body through the reflux pump.
According to the present invention, it is preferable that the activated sludge concentration in the low oxygen zone tank is 5000mg/l to 7000mg/l.
According to the present invention, preferably, the aeration pipe in the hypoxia zone has an aeration rate of 0.5-1m 3 And/m.h, the bubble size is 20-50 μm, and the rising speed of bubbles is 0.3-0.8m/s.
According to the present invention, preferably, the dissolved oxygen concentration in the low oxygen zone tank is controlled to be 0.5 to 1.0mg/l by the equipment control zone. In the invention, the dissolved oxygen meter of the equipment control area can detect the dissolved oxygen of a biochemical system in the low-oxygen area, and the variable frequency control device calculates the frequency of the blower according to the concentration of the dissolved oxygen.
According to the present invention, it is preferable that the bubble particle diameter of the air lifter is 15 to 25 μm.
According to the invention, preferably, the reflux ratio of the sludge mixed solution which flows back from the stripping zone to the front end of the low-oxygen zone tank body is 20-30 times. In the invention, the air lifter adopts a small-bubble lifting mode, and the air lifter has small bubbles with the bubble particle size of 15-25 mu m, so that the large water volume and small lift are lifted by reducing the density of the mixed liquid and depending on the buoyancy of the gas.
According to the present invention, it is preferable that the flow rate of the precipitated sludge entering the recirculation zone through the sludge inlet is 0.3m/s or more.
In the invention, after the sludge mixed liquid passes through the water inlet at the bottom, supernatant liquid passes through the inclined tube from bottom to top and then enters the water receiving weir.
In the present invention, the working principle of the present invention is as follows: firstly, sewage is uniformly distributed in a low-oxygen area through a water distribution device. After entering the low-oxygen area, the sewage is fully mixed with the activated sludge in the low-oxygen area. The dissolved oxygen in the low oxygen area is monitored on line through an oxygen dissolving instrument, and the frequency conversion control device controls the frequency of the blower according to the monitoring data of the oxygen dissolving instrument and the built-in program algorithm, so that the dissolved oxygen in the low oxygen area is controlled to be 0.5-1.0mg/l. The distance between two adjacent aeration pipes in the low oxygen area is 10cm to 15cm, and the low aeration rate is controlled, so that the micro-bubble group which is densely distributed along the whole tank body, uniform in size and rises at a low speed is formed, the gas-liquid contact area is increased, the gas-liquid contact time is prolonged, and the total transfer coefficient of oxygen is improved. Because of the oxygen supply mode of low dissolved oxygen, the mass transfer driving force of oxygen is increased, thereby improving the transfer speed of oxygen in the liquid phase. So that the limited DO can be fully utilized by the microorganisms, i.e., the apparent DO concentration in the liquid phase can be controlled to be very low or even zero. Synchronous nitrification and denitrification are carried out on the activated sludge system under the condition, so that removal of COD, TN and ammonia nitrogen in sewage is realized.
The air stripping zone at the rear end of the low-oxygen zone realizes the sludge reflux from the rear end to the front end through an air lifter, and the reflux ratio is 20-30 times. Because the air stripping pipe and the air inlet pipe supply air for the unified blower, the variable frequency control device can synchronously adjust the air supply quantity and the circulating flow quantity of the aeration area along with the change of running water, thereby being beneficial to balancing pollutant load, avoiding great fluctuation of oxygen demand and being beneficial to real-time control of low dissolved oxygen.
Sewage enters the clarification area after passing through the gas stripping area, sludge passes through a lower sludge layer at the lower part of the clarification area under the action of gravity, and the flow rate of the precipitated sludge entering the reflux area through the sludge inlet is more than 0.3m/s so as to avoid sludge accumulation and anaerobic fermentation in the clarification area and the reflux area. Supernatant enters the upper water receiving weir through the inclined pipe, so that mud-water separation is finally realized, and sewage is discharged after reaching standards. The inclined tube in the clarification area can effectively improve the mud-water separation efficiency of the clarification area by utilizing the shallow pool principle.
The technical scheme of the invention has the following beneficial effects:
the system has strong adaptability to sewage concentration change, and mainly benefits from the following two designs: firstly, sewage can be uniformly distributed in a biochemical pond through a water distribution device; secondly, the sewage passes through an air lifter at the tail end of the low-oxygen area, the sludge mixed solution at the tail end of the low-oxygen area is lifted to the front end, the reflux ratio is 20-30 times, and the inflow water can be rapidly diluted by the large reflux ratio.
Compared with the blower of the conventional sewage treatment system, the blower of the system can save energy by more than 40%, and mainly benefits from the following two designs: firstly, the system of the invention is provided with a special dissolved oxygen variable frequency control device, and the dissolved oxygen is controlled to be 0.5-1.0mg/l. The low dissolved oxygen not only reduces the energy consumption of the blower, but also can increase the proportion of synchronous nitrification and denitrification, thereby effectively reducing the addition amount of the carbon source; secondly, the system adopts a special PU material aeration pipe, compared with the traditional aerator, the particle size of the aeration pipe is 20-50 mu m, the smaller particle size of the aeration pipe reduces the rising speed of the bubbles in the mixed liquid by half, the residence time is doubled, and meanwhile, the smaller bubbles bring larger contact area, so that the oxygen utilization rate is effectively improved.
The system of the invention saves 30% of the floor space compared with the conventional sewage treatment system, and mainly benefits from two designs, the concentration of the activated sludge of the first system is about 5000mg/l-7000mg/l, and the system is improved by 60% compared with the conventional activated sludge system, and the unit volume of sludge is large, so that the floor space of a hypoxia area is small; secondly, the settling zone utilizes the shallow layer principle, the inclined tube design is added, the settling efficiency of the settling zone is improved by 50%, and the occupied area of the settling zone is further reduced.
The system has the advantages of large reflux ratio and low dissolved oxygen, and is particularly suitable for sewage with the following characteristics: firstly, TN of inflow water is more than 75mg/l, a carbon source is insufficient, and C/N of inflow water is less than 4; secondly, the fluctuation of the inflow water is larger, and the time-varying coefficient of COD and ammonia nitrogen is larger than 2; thirdly, partial industrial water and hardly degradable COD exist in the inflow water, and BOD/COD is lower than 0.3. After the treatment of the system of the invention, the effluent can stably reach the discharge standard, and individual areas can be directly used for reclaimed water recycling or landscape water recycling.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the invention.
Fig. 1 shows a schematic diagram of a low dissolved oxygen sewage treatment system provided in embodiment 1 of the present invention.
The reference numerals are explained as follows:
1-water inlet pipe, 2-water distribution weir, 3-low oxygen area, 4-haulage rope, 5-sludge mixed liquor, 6-aeration pipe,
9-low oxygen area cell body, 10-dissolved oxygen appearance, 11-singular blast branch pipe, 12-even number blast branch pipe, 13-singular diverter valve, 14-intake pipe, 15-stripping air pipe, 16-reflux tank, 17-air blower, 18-variable frequency control device, 19-mud back flow, 20-stripping area, 21-sewage back flow, 22-air lifter, 23-inclined tube nest, 24-water receiving weir, 25-clarification area, 26-reflux area, 27-reflux pump, 28-bottom water inlet, 29-even number diverter valve, 30-stripping area cell body, 31-clarification area cell body, 32-mud inlet, 33-reflux area cell body.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the preferred embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1
This embodiment provides a low dissolved oxygen wastewater treatment system, as shown in fig. 1, comprising an equipment control zone, a low oxygen zone 3, a stripping zone 20, a clarification zone 25, and a reflux zone 26;
the equipment control area comprises a blower 17, a variable frequency control device 18 and an oxygen dissolving instrument 10; one end of the oxygen dissolving instrument 10 is connected with the variable frequency control device 18, and the other end of the oxygen dissolving instrument 10 is arranged in the low oxygen area 3; one end of the blower 17 is connected with a variable frequency control device 18;
the low oxygen area 3 comprises a low oxygen area tank body 9, a water distribution device, a haulage rope 4, a guide groove (not shown), an aeration pipe 6, a blast branch pipe, a diverter valve and an air inlet pipe 14; the water distribution device is arranged above the low-oxygen area tank body 9 and is used for uniformly feeding water into the low-oxygen area tank body 9, and the water distribution device comprises a water inlet pipe 1, a water distribution weir 2 and a horizontal regulator (not shown); the water inlet pipe 1 is arranged above the water distribution weir 2; the horizontal regulator is used for horizontally fixing the water distribution weir 2 in the low oxygen zone 3; the water distribution weir 2 is a zigzag stainless steel water distribution weir, the height of the weir plate is 20cm, and the opening depth is 15cm; the guide groove is arranged at the bottom of the low oxygen area tank body 9, the aeration pipe 6 is arranged in the guide groove, the aeration pipe 6 comprises a singular aeration pipe and a double aeration pipe, the blasting branch pipe comprises a singular blasting branch pipe 11 and a double blasting branch pipe 12, and the splitter valve comprises a singular splitter valve 13 and a double splitter valve 29; one end of the haulage rope 4 is fixedly connected with the low oxygen area tank body 9, and the other end of the haulage rope 4 is respectively connected with one end of the single aeration pipe and one end of the double aeration pipes; the other end of the singular aeration pipe is sequentially connected with the singular blasting branch pipe 11 and the singular dividing valve 13; the other end of the double aeration pipe is sequentially connected with a double blast branch pipe 12 and a double flow dividing valve 29; the singular splitter valve 13 and the double splitter valve 29 are connected with the air outlet of the air inlet pipe 14; the single aeration pipe and the double aeration pipes are strip hoses made of PU materials, and the width of each hose is 65mm; the arrangement space between the single aeration pipe and the double aeration pipes is 10cm.
The stripping zone 20 comprises a stripping zone tank body 30, an air lifter 22, a stripping air pipe 15, a sewage return pipe 21 and a return groove 16; the air lifter 22 is arranged in the stripping zone tank body 30, an air outlet of the stripping air pipe 15 is connected with the air lifter 22, the air lifter 22 is used for conveying sewage in the stripping zone tank body 30 into a water inlet of the reflux groove 16 through the sewage reflux pipe 21, and a water outlet of the reflux groove 16 is arranged at the front end of the low-oxygen zone tank body 9;
the other end of the blower 17 is connected with the air inlet of the air inlet pipe 14 and the air inlet of the stripping air pipe 15;
the clarification zone 25 comprises a clarification zone tank body 31, a bottom water inlet 28, an inclined tube group 23 and a water receiving weir 24; the bottom water inlet 28 is arranged at the bottom of the wall of the tank body between the stripping zone 20 and the clarification zone 25; the water receiving weir 24 is arranged above the inclined tube group 23, and the inclined tube group 23 and the water receiving weir 24 are used for realizing solid-liquid separation of the sludge mixed liquid in the clarification area 25; the inclined tube group 23 includes a plurality of inclined tubes, the interval between the inclined tubes is 50mm, and the length of each inclined tube is 1m. The clarification zone 25 comprises an upper clear water layer and a lower sludge layer, the height of the upper clear water layer is 0.5-1m, and the height of the lower sludge layer is 1m;
a mud inlet 32 is arranged at the bottom of the wall of the pond between the reflux zone 26 and the clarification zone 25; the return zone 26 comprises a return pump 27 and a sludge return pipe 19, one end of the sludge return pipe 19 is connected with the return pump 27, and the other end of the sludge return pipe 19 is connected with the water inlet of the return tank 16.
The method for treating the low-dissolved oxygen sewage by adopting the system comprises the following steps of:
adding activated sludge into the low-oxygen area tank body 9; evenly feeding water into the low-oxygen area tank body through the water distribution device; controlling the concentration of dissolved oxygen in the low oxygen area pool body to be 0.5-1.0mg/l through the equipment control area; wherein the concentration of the activated sludge in the low-oxygen area tank body is 5000mg/l-7000mg/l; the aeration rate of the aeration pipe in the hypoxia zone is 0.5-1m 3 M.h the bubble particle size is 20-50 μm, and the rising speed of the bubbles is 0.5m/s;
in the stripping zone 20, the sludge mixed liquor entering the stripping zone tank body 30 is returned to the front end of the low-oxygen zone tank body 9 through the sewage return pipe 21 by the stripping action; wherein the air bubbles of the air lifter 22 have a particle size of 20 μm; the reflux ratio of the sludge mixed solution which flows back from the stripping zone 20 to the front end of the low-oxygen zone tank body 9 is 20-30 times;
in the clarification area 25, solid-liquid separation of the sludge mixed solution is realized by utilizing a shallow pool principle, so as to obtain precipitated sludge and supernatant, wherein the precipitated sludge enters the reflux area 26 through the sludge inlet 32, the flow rate is more than 0.3m/s, and the supernatant is discharged out of the system through the water receiving weir 24;
in the reflux zone 26, the precipitated sludge is refluxed to the front end of the low-oxygen zone tank body 9 by the reflux pump 27.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (10)
1. A low dissolved oxygen sewage treatment system, which is characterized by comprising an equipment control area, a low oxygen area, a gas stripping area, a clarifying area and a reflux area;
the equipment control area comprises a blower, a variable frequency control device and an oxygen dissolving instrument; one end of the oxygen dissolving instrument is connected with the variable frequency control device, and the other end of the oxygen dissolving instrument is arranged in the low oxygen area; one end of the blower is connected with the variable frequency control device;
the low oxygen area comprises a low oxygen area tank body, a water distribution device, a haulage rope, a guide groove, an aeration pipe, a blast branch pipe, a diverter valve and an air inlet pipe; the water distribution device is arranged above the low-oxygen area tank body and is used for uniformly feeding water into the low-oxygen area tank body; the guide groove is arranged at the bottom of the low-oxygen area tank body, and the aeration pipe is arranged in the guide groove; one end of the haulage rope is fixedly connected with the low oxygen area tank body, and the other end of the haulage rope is sequentially connected with the aeration pipe, the blast branch pipe, the diverter valve and the air outlet of the air inlet pipe;
the air stripping zone comprises a pool body of the air stripping zone, an air lifter, an air stripping air pipe, a sewage return pipe and a reflux groove; the air lifter is arranged in the gas stripping zone tank body, the air outlet of the gas stripping air pipe is connected with the air lifter, the air lifter is used for conveying sewage in the gas stripping zone tank body into the water inlet of the reflux tank through the sewage reflux pipe, and the water outlet of the reflux tank is arranged at the front end of the hypoxia zone tank body;
the other end of the air blower is connected with the air inlet of the air inlet pipe and the air inlet of the stripping air pipe;
the clarification zone comprises a clarification zone tank body, a bottom water inlet, an inclined tube group and a water receiving weir; the bottom water inlet is arranged at the bottom of the wall of the pond between the stripping zone and the clarifying zone; the water receiving weir is arranged above the inclined tube group, and the inclined tube group and the water receiving weir are used for realizing solid-liquid separation of the sludge mixed liquid in the clarification area;
a mud inlet is formed in the bottom of the wall of the pond body between the backflow area and the clarification area; the reflux zone comprises a reflux pump and a sludge reflux pipe, one end of the sludge reflux pipe is connected with the reflux pump, and the other end of the sludge reflux pipe is connected with a water inlet of the reflux groove.
2. The low dissolved oxygen sewage treatment system of claim 1, wherein,
the water distribution device comprises a water inlet pipe, a water distribution weir and a horizontal regulator;
the water inlet pipe is arranged above the water distribution weir;
the horizontal regulator is used for horizontally fixing the water distribution weir in the hypoxia zone.
3. The low dissolved oxygen sewage treatment system of claim 2, wherein the water distribution weir is a serrated stainless steel water distribution weir, the height of the weir plate is 15-25cm, and the depth of the opening is 10-20cm.
4. The low dissolved oxygen sewage treatment system of claim 1, wherein,
the aeration pipes comprise single aeration pipes and double aeration pipes;
the blast branch pipes comprise singular blast branch pipes and even blast branch pipes;
the diverter valve comprises a singular diverter valve and a double diverter valve;
the other end of the traction rope is respectively connected with one end of the single aerator pipe and one end of the double aerator pipes; the other end of the singular aeration pipe is sequentially connected with a singular blasting branch pipe and a singular diverter valve; the other end of the double-number aeration pipe is sequentially connected with a double-number blasting branch pipe and a double-number flow dividing valve;
and the single-number diverter valve and the double-number diverter valve are both connected with the air outlet of the air inlet pipe.
5. The low dissolved oxygen sewage treatment system of claim 4, wherein,
the single aeration pipe and the double aeration pipes are strip hoses made of PU materials, and the widths of the hoses are respectively and independently 60-70mm;
the arrangement space between the single aeration pipe and the double aeration pipes is 5cm to 20cm.
6. The low dissolved oxygen sewage treatment system of claim 1, wherein the group of inclined pipes comprises a plurality of inclined pipes, the interval between the inclined pipes is 45-55mm, and the length of each inclined pipe is 0.5-1.5m.
7. The low dissolved oxygen wastewater treatment system of claim 1, wherein the clarification zone comprises an upper clear water layer and a lower sludge layer, the upper clear water layer having a height of 0.5-1m and the lower sludge layer having a height of 0.5-1.5m.
8. A method for treating sewage with low dissolved oxygen, characterized in that the method adopts the system as defined in any one of claims 1 to 7, and comprises the following steps:
adding activated sludge into the low-oxygen area tank body; evenly feeding water into the low-oxygen area tank body through the water distribution device; controlling the concentration of dissolved oxygen in the low-oxygen area cell body through the equipment control area;
in the stripping zone, the sludge mixed liquor entering the tank body of the stripping zone is refluxed to the front end of the tank body of the hypoxia zone through the sewage reflux pipe by virtue of the stripping action;
in the clarification area, solid-liquid separation of the sludge mixed solution is realized by utilizing a shallow pool principle, so as to obtain precipitated sludge and supernatant, wherein the precipitated sludge enters the reflux area through the sludge inlet, and the supernatant is discharged out of the system through the water receiving weir;
in the reflux zone, the precipitated sludge is refluxed to the front end of the low-oxygen zone tank body through the reflux pump.
9. The low dissolved oxygen sewage treatment method according to claim 8, wherein,
the concentration of the activated sludge in the low-oxygen area tank body is 5000mg/l-7000mg/l;
the aeration rate of the aeration pipe in the hypoxia zone is 0.5-1m 3 M.h the bubble particle size is 20-50 μm, and the rising speed of the bubbles is 0.3-0.8m/s;
and controlling the concentration of dissolved oxygen in the low oxygen area cell body to be 0.5-1.0mg/l through the equipment control area.
10. The low dissolved oxygen sewage treatment method according to claim 8, wherein,
the bubble particle size of the air lifter is 15-25 mu m;
the reflux ratio of the sludge mixed solution which flows back from the stripping zone to the front end of the low-oxygen zone tank body is 20-30 times;
the flow rate of the precipitated sludge entering the reflux zone through the sludge inlet is more than 0.3 m/s.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103395948A (en) * | 2013-08-18 | 2013-11-20 | 武汉宝捷能环境工程技术有限公司 | Z-shaped gas stripping reflux two-stage precipitation integrated sewage treatment tank |
| CN109305725A (en) * | 2018-11-23 | 2019-02-05 | 恩格拜（武汉）生态科技有限公司 | Biochemical sewage treatment process |
| CN110510737A (en) * | 2019-08-09 | 2019-11-29 | 恩格拜（武汉）生态科技有限公司 | Reinforced activated sludge process for sewage treatment |
| CN210974309U (en) * | 2019-08-09 | 2020-07-10 | 恩格拜（武汉）生态科技有限公司 | Strengthen biochemical treatment pond of activated sludge process sewage |
| US20220055929A1 (en) * | 2018-12-25 | 2022-02-24 | Hunan Wisdom Water Environmental Engineering Co., Ltd | Sewage treatment equipment applicable to domestic sewage treatment of multiple households |
-
2022
- 2022-12-14 CN CN202211607242.8A patent/CN116102199A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103395948A (en) * | 2013-08-18 | 2013-11-20 | 武汉宝捷能环境工程技术有限公司 | Z-shaped gas stripping reflux two-stage precipitation integrated sewage treatment tank |
| CN109305725A (en) * | 2018-11-23 | 2019-02-05 | 恩格拜（武汉）生态科技有限公司 | Biochemical sewage treatment process |
| US20220055929A1 (en) * | 2018-12-25 | 2022-02-24 | Hunan Wisdom Water Environmental Engineering Co., Ltd | Sewage treatment equipment applicable to domestic sewage treatment of multiple households |
| CN110510737A (en) * | 2019-08-09 | 2019-11-29 | 恩格拜（武汉）生态科技有限公司 | Reinforced activated sludge process for sewage treatment |
| CN210974309U (en) * | 2019-08-09 | 2020-07-10 | 恩格拜（武汉）生态科技有限公司 | Strengthen biochemical treatment pond of activated sludge process sewage |
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Inventor after: Shi Luyuan Inventor after: Chang Jiang Inventor after: Bai Yongsheng Inventor after: Wang Jiawei Inventor after: Su Bojun Inventor after: Zhao Mengqi Inventor after: Cui Baocong Inventor before: Shi Luyuan Inventor before: Chang Jiang Inventor before: Bai Yongsheng Inventor before: Wang Jiawei Inventor before: Su Bojun Inventor before: Zhao Mengqi Inventor before: Cui Baocong |