CN114716018B - Integrated sewage treatment system and process - Google Patents
Integrated sewage treatment system and process Download PDFInfo
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- CN114716018B CN114716018B CN202210378767.2A CN202210378767A CN114716018B CN 114716018 B CN114716018 B CN 114716018B CN 202210378767 A CN202210378767 A CN 202210378767A CN 114716018 B CN114716018 B CN 114716018B
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- 229920002635 polyurethane Polymers 0.000 claims description 11
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- 230000035484 reaction time Effects 0.000 claims description 6
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Classifications
-
- 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
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- 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)
- Biological Treatment Of Waste Water (AREA)
Abstract
The application belongs to the technical field of sewage treatment, and relates to an integrated sewage treatment system and process. Aiming at the technical problems that in the prior art, a rural sewage treatment system is required to be provided with a sedimentation device such as a secondary sedimentation tank or a sludge tank at the water outlet end, so that the occupied area is difficult to reduce, the application provides an integrated sewage treatment system which is provided with a water outlet at the lower part of a sequencing batch biofilm reaction device, is 1/10-1/5 away from the bottom, is filled with a plurality of elastic fillers, does not need to be provided with a sedimentation device, has few monomer structures, and has high integration degree and small occupied area. The application also provides an integrated sewage treatment process, which combines a biomembrane method and a sequencing batch treatment mode with self-filtering of the discharged water, and the sedimentation time is not required to be set in the treatment process.
Description
Technical Field
The application belongs to the technical field of sewage treatment, and particularly relates to an integrated sewage treatment system and process.
Background
With the rapid development of rural economy in recent years, the water consumption of rural life is greatly improved, but the problem of rural sewage discharge is more and more remarkable due to the fact that the population of the rural area is numerous and the environmental awareness is weak, a large amount of sewage is not effectively treated and is directly discharged in an unorganized manner, so that the serious environmental pollution of the rural area is caused, and the health problem of vast rural people is directly or indirectly influenced. Rural sewage has the characteristics of dispersed sewage water sources, unsound pipe network collecting systems, large change of sewage water quality and water quantity, higher concentration of pollutants in sewage and the like, if rural domestic sewage is uniformly collected and treated, the sewage pipe network collecting systems are required to be built in a large area, the cost of ton water is high, and the problems of difficult operation and maintenance caused by lack of professional operators are solved, so that the rural sewage still cannot be treated economically and effectively.
At present, most of common rural sewage treatment equipment adopts traditional biochemical water treatment processes, such as MBR (membrane biological reactor) membrane process, biological contact oxidation method and the like. Chinese patent application publication No. CN112079528A, the application is named as a centralized treatment type rural sewage treatment method, and the disclosed method sends wastewater from a rural sewage pipe network into a mechanical grid for separating garbage in water; stirring and pre-aerating the wastewater in an adjusting tank, and sending the treated water into a methane tank for fermentation treatment; after BOD in the water is removed by the anoxic reaction tank; degrading organic matters in the water in the aerobic gas reaction tank; the secondary sedimentation tank separates the sludge from the supernatant liquid. The scheme improves the treatment efficiency of rural wastewater and improves the recycling rate. However, although the process has small mud yield, the water outlet end still needs to be provided with facilities such as a secondary sedimentation tank, a sludge tank and the like, and the single structure is more and the occupied area is difficult to reduce. As another example, chinese patent application publication No. CN111908607a, entitled "a system suitable for treating rural sewage", the disclosed method includes a biological rotating disc tank, an anoxic tank, an anaerobic tank, a biological contact oxidation tank and a filter tank which are sequentially connected, a first mixed liquid return pipe is disposed between the biological rotating disc tank and the anaerobic tank, and a second mixed liquid return pipe is disposed between the biological contact oxidation tank and the anoxic tank. In the sewage treatment process, three denitrification and three dephosphorization are realized, and the TP and TN values of the sewage are greatly reduced through multistage denitrification and dephosphorization, so that the sewage reaches the emission standard. However, the biological phosphorus removal is difficult to reach the corresponding index, chemical phosphorus removal is used as a later-stage technical guarantee in the general process design, a precipitation structure of a coagulation structure agent is further increased, a precipitation stage is required to be added in the operation section, and then the equipment occupation and the investment operation cost are increased. In addition, part of the process operation and maintenance management is complex, the requirement on personnel operation capacity is high, and the labor cost is high.
The Chinese patent application publication No. CN1450004A, entitled "method for synchronous nitrification and denitrification treatment of municipal sewage by sequencing batch biofilm method", discloses a method comprising four stages of anaerobic circulating water inlet, aerobic aeration, precipitation and drainage, wherein the operation procedure of the method is anaerobic/aerobic, and can be used for removing organic matters and nitrogen and phosphorus in a reaction device. The method is characterized in that the anaerobic circulation time is 3-4 hours, the aerobic aeration time is 3-5 hours, the sedimentation time is 0.5-1 hour, and the drainage time is 0.3-0.5 hour. However, the process needs to set separate sedimentation time, adopts a drainage mode, and the drainage after sedimentation is easy to carry sludge out of the system, so that the effluent index exceeds the standard.
Disclosure of Invention
1. Problems to be solved
Aiming at the technical problems that in the prior art, a rural sewage treatment system is required to be provided with a sedimentation device such as a secondary sedimentation tank or a sludge tank at the water outlet end, so that single structures are more and the occupied area is difficult to reduce, the application provides an integrated sewage treatment system. The application also provides an integrated sewage treatment process, which combines a biomembrane method and a sequencing batch treatment mode with self-filtering of the discharged water, and the sedimentation time is not required to be set in the treatment process.
2. Technical proposal
In order to achieve the above purpose, the technical scheme provided is as follows:
the application relates to an integrated sewage treatment system, which comprises a sequencing batch type biological film reaction device, wherein the sequencing batch type biological film reaction device is provided with a water outlet, and the distance between the water outlet and the bottom of the sequencing batch type biological film reaction device is 1/10-1/5 of the height of the sequencing batch type biological film reaction device;
and a plurality of elastic fillers are placed in the sequencing batch type biological film reaction device, and the filling volume of the fillers is 85-95% of the volume of the sequencing batch type biological film reaction device.
Preferably, the filling volume of the filler is 90-95% of the volume of the sequencing batch biofilm reaction device.
Preferably, the water inlet is arranged at the bottom of the sequencing batch biofilm reaction device, and the distance from the bottom is 1/10-1/5 of the height of the sequencing batch biofilm reaction device.
By placing the elastic filler in the integrated sewage treatment system, a large amount of microorganisms adhere to the surface of the filler for growth and reproduction, and the pollutant in the sewage is intercepted by utilizing the characteristic of smaller particle size of the filler and the biological flocculation effect of the biological film, so that the higher microorganism concentration in the biochemical system is ensured, the pollutant treatment load is improved, the treatment flux is increased, and the hydraulic time is shortened. Not only can the system stability be increased, the sludge expansion risk is reduced, and the impact load resistance is improved; the water can be discharged while being filtered, and the precipitation device and the precipitation time at the water outlet end of the equipment are reduced.
The water outlet is arranged at the lower part of the sequencing batch biofilm reaction device, so that in the water outlet process of the equipment, sludge is fully intercepted in the filler along with the rising process of sewage, and suspended matters in the water outlet are ensured to reach the standard.
The integrated sewage treatment system does not need to be provided with a secondary sedimentation tank or a sludge tank and other sedimentation devices, has few single structures and occupies small area.
Further, the elastic filler is one or more of polyurethane filler and modified polymer filler.
Elastic filler is arranged in the sequencing batch biofilm reaction device and used as a carrier: 1. the three-dimensional elastic filler has high mechanical toughness, is resistant to friction collision and hydraulic shearing action between fillers, and has low wear rate; 2. rough surface and inside, good hydrophilicity, porosity of more than 95 percent, specific surface area of 10000m 2 /m 3 The method comprises the steps of carrying out a first treatment on the surface of the 3. In the nitration reaction system, the carrier can play a role in cutting and blocking bubbles, so that the residence time of the bubbles in the water body and the contact surface area of the bubbles with the liquid are greatly increased, and the mass transfer efficiency is improved; 4. the device has strong interception capability to microorganisms, can intercept suspended matters in water while discharging water in the drainage process, and has good water discharge effect.
The high porosity of the elastic filler is suitable for microorganism growth, sewage flows through the filler and is fully contacted, and the sewage is rapidly purified by utilizing the strong degradation capability of high-concentration biomass on the filler; in addition, the biological membrane intercepts pollutants in sewage by utilizing the characteristic of smaller particle size of the filler and the biological flocculation of the biological membrane. The treatment system can effectively remove pollutants in sewage in the biochemical operation stage through the characteristic of combining the two actions. After the biochemical stage treatment is completed, the drainage valve is directly opened to drain, and pollutants and suspended matters generated in water are intercepted by the filler in the drainage process, so that filtration is realized while drainage, a sedimentation device is not required to be arranged at the tail end, and the sedimentation time is not required to be specially set in the operation process.
Further, when the elastic filler is polyurethane filler, the polyurethane filler has a size of a cube with a side length of 20-30 mm; when the filler is modified polymer filler, the size of the modified polymer filler is a cylinder with the diameter of 5-25 mm and the length of 5-10 mm.
Preferably, the elastic polyurethane filler is a cube with a side length of 25mm.
Preferably, the polymer filler is a cylinder with the diameter of 25mm and the length of 10mm.
Further, the system also comprises a regulating and storing tank and a lifting device, wherein the regulating and storing tank, the lifting device and the sequencing batch type biological film reaction device are sequentially connected; the lifting water quantity of the lifting device is 10-15 times of the processing capacity of the sequencing batch biofilm reaction device.
Preferably, the lifting device mainly comprises a lifting pump station and a grating, the lifting pump lifts sewage into the sequencing batch type biological film reaction device, the grating intercepts larger suspended matters in the sewage, and the lifting pump selects a large amount of high-lift water pumps to realize rapid water inlet.
Preferably, when aiming at a sequencing batch biofilm reaction device with smaller volume (below 200 square), the volume of the regulating reservoir is set to be 20-24 h of water inflow; when the sequencing batch biofilm reaction device with larger volume (200 square or above) is used, the volume of the regulating reservoir is set to be 12-15 h water inflow in order to avoid the oversized regulating reservoir. By the design, the water pump is prevented from being blocked due to continuous small-square-volume water inflow, the later-period shutdown maintenance frequency is reduced, and the continuous water inflow energy consumption of a large-square-volume short-time water inflow with smaller square-volume water inflow is lower. The system stability is improved, the impact load resistance is strong, and the system is suitable for use scenes in which the rural sewage water quantity and the water quality are unstable.
Further, the device also comprises a return pipeline arranged between the sequencing batch biofilm reaction device and the regulating reservoir.
Further, the device also comprises a dosing device arranged in the sequencing batch biofilm reaction device.
Preferably, the device also comprises a back flushing device arranged in the sequencing batch biofilm reaction device.
An integrated sewage treatment process, which uses the integrated sewage treatment system, comprises the following steps:
pumping the sewage stored in the regulating reservoir into a sequencing batch biofilm reaction device through a lifting device, and then performing anoxic reaction to obtain sewage after anoxic treatment;
a step of carrying out an aerobic reaction on the sewage subjected to the anoxic treatment to obtain sewage subjected to the aerobic treatment;
and directly discharging the sewage after the aerobic treatment through the water outlet without precipitation treatment.
Further, the method also comprises the step of refluxing the supernatant liquid of the sewage after the aerobic treatment to the regulating reservoir.
Further, the water inlet time is 15-30 min; the reaction time of the hypoxia and the aerobic is 3-5 hours; the drainage time is about 10-15 min.
Further, the method also comprises a step of adding medicines after the aerobic treatment step.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the application has the following beneficial effects:
(1) According to the integrated sewage treatment system, the water outlet is arranged at the lower part of the sequencing batch type biological film reaction device, the distance between the water outlet and the bottom is 1/10-1/5 of the height of the sequencing batch type biological film reaction device, a plurality of elastic fillers are placed in the sequencing batch type biological film reaction device, and the filling volume of the fillers is 85-95% of the volume of the sequencing batch type biological film reaction device. In the system, filler is added to serve as a biological carrier, sewage flows through the filler and is fully contacted, and the sewage is rapidly purified by utilizing the strong degradation capability of high-concentration biomass on the filler; meanwhile, the characteristics of small filler particle size and biological flocculation of the biological film are utilized, the biological film intercepts pollutants in sewage, and the sewage is discharged and filtered, a precipitation device is not required to be arranged at the tail end of the system, the whole manufacturing cost of the equipment is low, the energy consumption is low, the occupied area is small, the stability is high, and the impact load resistance is strong.
(2) The integrated sewage treatment process of the application can be summarized as follows: compared with the existing rural sewage treatment process, the sedimentation time is not required to be set in the treatment process, the treated water body is filtered while being discharged, the sedimentation is completed after the water discharge is completed, and the water inlet pump can be started to start the next batch of treatment after the water discharge is completed. The water inlet time is 15-30 min; the anoxic reaction time is 3-5 hours; the drainage time is about 10-15 min, namely the treatment time of each batch is about 4-6 h, and 4-6 batches can be treated every day.
Drawings
FIG. 1 is a schematic diagram of the operating conditions of an integrated wastewater treatment process plant;
FIG. 2 is a schematic diagram of an integrated wastewater treatment process.
Detailed Description
For a further understanding of the present application, the present application will be described in detail with reference to examples.
Example 1
An integrated sewage treatment system of this embodiment includes the following devices:
the device comprises a regulating and accumulating tank, a lifting device and a sequencing batch type biological film reaction device which are sequentially connected, wherein the size of the sequencing batch type biological film reaction device is B, H=Φ2200, 2000mm, and the effective volume of the device is 6.7m 3 . The water inlet is 200mm away from the bottom of the device, and the water outlet is 180mm away from the bottom of the sequencing batch biofilm reaction device.
The filling volume of the filler in the device is 6m 3 The filler adopts square polyurethane filler, and the filler size is 25 x 25mm.
The lifting water quantity of the lifting device is 15 times of the processing capacity of the sequencing batch biofilm reaction device. The lifting device mainly comprises a lifting pump station and a grating, the lifting pump lifts sewage into the sequencing batch type biological film reaction device, the grating intercepts larger suspended matters in the sewage, and the lifting pump selects a large amount of high-lift water pumps to realize quick water feeding.
The embodiment further comprises a return pipeline arranged between the sequencing batch biofilm reaction device and the regulating reservoir, and a dosing device arranged in the sequencing batch biofilm reaction device.
The system can be highly combined with an automatic control system, and can realize unattended station.
Example 2
An integrated wastewater treatment system according to this embodiment is substantially the same as that of embodiment 1, except that the filler packing volume in the apparatus is 5.7m 3 At this time, the equipment filling rate was 85%; the filler size is 20 x 20mm, and the water outlet is 400mm away from the bottom of the sequencing batch biofilm reaction device. The lifting water quantity of the lifting device is 10 times of the processing capacity of the sequencing batch biofilm reaction device.
Example 3
An integrated sewage treatment system according to this embodiment is substantially the same as that of embodiment 1, except that the elastic filler according to this embodiment is a modified high molecular filler HDPE (high density polyethylene filler), and the filler filling volume in the apparatus is 6.4m 3 . The filler size isThe packing density is 0.95g/cm < 3 >, which is close to water, and the membrane can be well suspended in water body without sinking and floating.
Comparative example 1
An integrated wastewater treatment system of this comparative example was substantially the same as in example 1, except that the apparatus used polyurethane filler sizes of 10 x 10mm. The water outlet is 1000mm away from the bottom of the sequencing batch biofilm reactor.
Comparative example 2
An integrated wastewater treatment system of this comparative example was substantially the same as in example 1, except that the apparatus employed a conventional ceramic filler. The filler size is 5mm, the filling height is 0.8m, and the filling volume is 3.5m 3 。
Comparative example 3
An integrated sewage treatment system of this comparative example was substantially the same as in example 1, except that the apparatus was filled with a filler having a filling volume of 3m 3 The filler loading was 45%.
Example 4
An integrated wastewater treatment process of this embodiment uses the system of example 1.
When the first batch starts, the liquid level meter at the top of the regulating reservoir starts to read the liquid level of the regulating reservoir, when the liquid level is larger than the set safety liquid level, the system lifting device is opened, and when the probe liquid level meter at the top of the sequencing batch type biological film reaction device detects that the liquid level of the sequencing batch type biological film reaction device reaches the preset reaction liquid level, the lifting device is closed. And (3) standing the system and starting an anoxic reaction stage, when the anoxic reaction is finished, starting an air blower by the automatic control system to start aeration, enabling the system to enter an aerobic treatment stage along with the continuous rise of the dissolved oxygen of the sewage, and after the set aerobic treatment time, starting a PAC dosing pump by the system in the last five minutes of the aerobic stage, and fully reacting in the system through aeration PAC. After the coagulation time is set, detecting the liquid level of the regulating reservoir by a liquid level meter at the top of the regulating reservoir, and when the water level in the regulating reservoir is higher than the set minimum water inlet liquid level, opening a valve of a water outlet by the system, and discharging supernatant out of the system; when the water level in the regulating and storing tank is lower than the set minimum water inlet liquid level, the system is communicated with a return pipeline, the supernatant returns to the regulating and storing tank and is continuously mixed with the residual sewage in the regulating and storing tank, and the residual sewage returns to the system to participate in the reaction, so that the condition that the system has no water inlet is avoided.
In the system drainage process, when the liquid level in the system reaches the designed minimum liquid level, which is monitored by the liquid level meter at the top of the sequencing batch biofilm reaction device, the water outlet valve is closed, the first batch processing is completed, and then water inflow starts to the next batch.
The original sewage of the system is reserved with a large amount of nitrate reserved in the sequencing batch biofilm reaction device in the previous batch of aerobic nitrification stage, the inlet water is fully mixed with the original sewage in the system, the mixed solution takes organic matters in the sewage as a carbon source, and denitrification are carried out in the anoxic reaction system process, so that the aim of removing total nitrogen is fulfilled; and according to the operation condition, after the anoxic reaction time is reached, starting an aeration system, and continuously increasing the concentration of dissolved oxygen in the system and entering an aerobic reaction stage. After aeration is added in the aerobic stage, the sewage is further degraded into organic matters, and nitrification of ammonia nitrogen and removal of partial COD are mainly carried out. After the reaction time of the aerobic system is reached, the aeration system is closed, the water outlet valve is opened, and the water outlet is discharged out of the system through the water outlet.
Except for the normal treatment process, the system needs to be backwashed regularly, and the general system is backwashed once in about 7 to 10 days according to the water quality condition. When the system detects that the total amount of water inflow in the backwashing period reaches the set water inflow amount of 7-10 days, the system automatically backflushes before the next batch. Backwashing: after the last batch is finished, the aeration valve is closed, the backwashing valves on two sides are opened, the lifting pump is started, the fan is started at the same time, after the backwashing time is set, the fan and the backwashing valve are closed, the emptying valve is opened to empty the sludge in the sludge concentration tank, and the sludge in the concentration tank is regularly pumped and discharged.
In this example, the wastewater to be treated is typical rural sewage, and the water inlet parameters mainly include Chemical Oxygen Demand (COD), ammonia nitrogen, total Phosphorus (TP) and solid Suspended Solids (SS). The water inflow of the rural sewage is 10m 3 And/d, the sewage treatment device accords with the conventional rural sewage discharge characteristics, and water or intermittent water inflow is usually generated. The water quality of the inflow water is designed to be that COD is less than or equal to 250mg/L, ammonia nitrogen is less than or equal to 40mg/L, TP is less than or equal to 4mg/L, and SS is less than or equal to 200mg/L. The water quality index of the effluent is designed to be COD less than or equal to 100mg/L, ammonia nitrogen less than or equal to 25mg/L, TP less than or equal to 3mg/L and SS less than or equal to 30mg/L.
The sewage enters the sequencing batch type biological film reaction device from the water inlet at the bottom after most solid impurities are removed by the lifting device through the grating, the fan provides oxygen for the sequencing batch type biological film reaction device, and the microorganism carries out nitration reaction under the aerobic condition to remove ammonia nitrogen and COD. After the aerobic state runs for a certain time, the fan system is closed, the water outlet valve is opened, clean water is discharged out of the sequencing batch type biological film reaction device through the water outlet at the lower part and is intercepted, and total phosphorus and suspended matters in sewage are intercepted in the sequencing batch type biological film reaction device by the filler in the form of sludge, so that the removal of two pollutants is realized. And discharging supernatant after the system is settled, and periodically draining the sludge into a sludge collecting tank.
The detection results of the inlet water and the outlet water show that the ammonia nitrogen of the inlet water is about 46.9mg/L, the TP is about 4mg/L, the COD is about 360mg/L, the SS is about 120mg/L, the ammonia nitrogen of the outlet water is about 6mg/L, the TP is about 2.1mg/L, the COD is about 15mg/L, and the SS is about 13mg/L. The high-integration design of each reaction stage can effectively remove various pollutants in sewage and ensure that the effluent is stable and reaches the standard.
Example 5
An integrated wastewater treatment system in this embodiment is substantially the same as in embodiment 4, except that the system is required to check the total nitrogen index, and the system includes an anoxic reaction system. The method is suitable for scenes with low total nitrogen content and total phosphorus water outlet requirements.
When the total nitrogen index is set in the water to be treated, an anoxic reaction stage can be added before the aerobic reaction stage on the basis of the embodiment 4, and indexes such as total nitrogen, ammonia nitrogen, total phosphorus, SS and the like are removed by adopting a two-stage sequencing batch processing mode of anoxic reaction and aerobic reaction.
After sewage enters the system, the anoxic reaction is started, the original sewage in the system contains a large amount of nitrate which is reserved in the system from the previous batch of aerobic nitrification stage, the inflow water is fully mixed with the original sewage in the system, the mixed liquid takes organic matters in the sewage as a carbon source, and denitrification are carried out in the anoxic reaction system process, so that the aim of removing total nitrogen is fulfilled; and (3) starting an aeration system according to the operation condition after the anoxic reaction time is reached, and enabling the system to enter an aerobic reaction stage. After aeration is added in the aerobic stage, the sewage is further degraded into organic matters, and the nitrification of ammonia nitrogen and the removal of COD are mainly carried out. After the biochemical section treatment is completed, a drainage valve is opened, and the pollutant is trapped while the water is drained.
Example 6
An integrated wastewater treatment process of this embodiment is substantially the same as that of embodiment 4, except that the system of embodiment 2 is used.
In this embodiment, the water to be treated adopts typical rural sewage, and the water inlet parameters mainly include Chemical Oxygen Demand (COD), ammonia nitrogen, total Phosphorus (TP) and solid Suspended Solids (SS). The water inflow of the rural sewage is 10m 3 And/d, the sewage treatment device accords with the conventional rural sewage discharge characteristics, and water or intermittent water inflow is usually generated. The water quality of the inflow water is designed to be COD less than or equal to 200mg/L, ammonia nitrogen less than or equal to 35mg/L, TP less than or equal to 4mg/L and SS less than or equal to 200mg/L. The water quality index of the effluent is designed to be COD less than or equal to 100mg/L, ammonia nitrogen less than or equal to 20mg/L, TP less than or equal to 3mg/L and SS less than or equal to 30mg/L.
After the sewage is treated by adopting the filling rate and the filling size, the ammonia nitrogen in the effluent is about 10.6mg/L, the TP is about 2.3mg/L, the COD is about 63mg/L, the SS is about 21mg/L, and the effluent can reach the standard stably.
Example 7
An integrated wastewater treatment process of this embodiment is substantially the same as that of embodiment 6, except that the system of embodiment 3 is used.
The method is the same as that of the example 6 for treating water quality and quantity, after the sewage is treated by adopting the filling rate and the filling size, ammonia nitrogen in the effluent is about 16.6mg/L, TP is about 2.2mg/L, COD is about 49mg/L, SS is about 27mg/L, various pollutants in the sewage can be effectively removed, and the effluent is stable and reaches the standard.
Comparative example 4
An integrated wastewater treatment system of this comparative example was substantially the same as in example 4, except that the filler of comparative example 2 was used.
As in the case of the water quality and quantity in example 4, after the sewage is treated by adopting the ceramsite filler, the ammonia nitrogen in the effluent is about 9.6mg/L, the TP is about 2.4mg/L, the COD is about 49mg/L, the SS is about 24mg/L, and the effluent can reach the standard stably. After the equipment runs for a period of time, the inside of the ceramsite filler is blocked, the sewage treatment efficiency is obviously reduced, the ammonia nitrogen in the effluent is about 19.5mg/L, the TP is about 2.9mg/L, the COD is about 87mg/L, the SS is about 31.6mg/L, the effluent index is obviously increased, and the system effluent occasionally does not reach the standard.
As can be seen from the comparison between the example 4 and the comparative example 4, the polyurethane filler has higher porosity than the ceramsite, volcanic filler and the like, has smaller gaps and is easier for microorganisms to attach in the agricultural sewage system. Therefore, in the filler with the same volume, the microbial concentration of the polyurethane filler is higher than that of the ceramic filler, the treatment efficiency is higher, and the concentration of effluent pollutants is lower under the same condition. In addition, the ceramsite filler has high requirement on wind pressure and water pressure in the backwashing process due to large dead weight, is easy to recoil incompletely and is easy to block, so that subsequent water yielding is easy to reach the standard.
Comparative example 5
An integrated sewage treatment system of this comparative example was substantially the same as in example 4, except that the water outlet was provided in a position on the side wall of the tank, at a middle upper position, and the water outlet was 300mm from the top of the apparatus. The comparative example 4 adopts the same operation mode as the example 4, and after sewage sequentially passes through a lifting system, a grille and an aerobic system, the effluent of the equipment is discharged. When the treatment is carried out by adopting the upper drainage mode, a water inlet valve is required to be opened, and the clear water in the previous batch treatment is ejected out of the system by continuously feeding water, wherein ammonia nitrogen in the water discharged by the mode is about 21mg/L, TP is about 2.6mg/L, COD is about 75mg/L, SS is about 24mg/L, the discharged water can reach the standard, but the concentration of discharged water pollutants is higher.
Compared with the upper drainage mode, the lower drainage mode adopted in the agricultural sewage system is better in pollutant interception effect of the filler in the system and more stable in water outlet as shown in the comparison of the example 4 and the comparative example 5. Therefore, in the same treatment system, the interception effect of polyurethane filler can be better reflected by adopting a drainage mode, pollutants are intercepted in the system, and the system water outlet is more stable.
Comparative example 6
An integrated wastewater treatment system of this comparative example was substantially the same as in example 4, except that the corresponding size of the filler of comparative example 1 was used.
The comparative example 6 adopts the same operation mode as that of the example 4, and after sewage sequentially passes through a lifting system, a grille and an aerobic system, the effluent of the equipment is discharged. After the treatment by adopting the drainage mode, the ammonia nitrogen in the effluent is about 11mg/L, the TP is about 2.1mg/L, the COD is about 45mg/L, the SS is about 26mg/L, and the effluent can reach the standard, but the SS index has the risk of exceeding the standard. In addition, because the filler size is smaller, the filler is seriously worn due to mutual friction and sun exposure among the fillers in the use process, and the fillers need to be periodically replenished or replaced.
As can be seen from the comparison of the example 4 and the comparative example 6, in the agricultural pollution system, the filler with smaller size is adopted, the interception effect of the filler on pollutants in the system is poor, the yielding water is unstable, and the abrasion condition of the filler is more prominent. Therefore, in the same treatment system, the proper filler size is adopted, so that pollutants are more effectively trapped in the system, and the system water outlet is more stable.
Comparative example 7
An integrated wastewater treatment system of this comparative example was substantially the same as in example 4, except that the filler of comparative example 3 was used at the corresponding filling rate.
The comparative example 7 adopts the same operation mode as that of the example 4, and after sewage sequentially passes through a lifting system, a grille and an aerobic system, the effluent of the equipment is discharged. After the treatment by adopting the drainage mode, the ammonia nitrogen in the effluent is about 23mg/L, the TP is about 3.2mg/L, the COD is about 79mg/L, the SS is about 36mg/L, and the effluent cannot reach the standard stably.
As can be seen from the comparison between the example 4 and the comparative example 7, in the agricultural sewage system, when the filling rate of the filler in the treatment system is low, on one hand, microorganisms in the treatment system are few, and pollutants in sewage cannot be removed stably, so that various indexes of water quality are high, and on the other hand, when the filling rate of the filler is low, the interception effect of the filler on pollutants in the system is poor, and the effluent is unstable. Therefore, in the same treatment system, the proper filling rate of the filling material is adopted, so that corresponding pollutants are removed more effectively and are trapped in the system, and the system water outlet is more stable.
Example 1 is a preferred embodiment, example 2 is an embodiment with the lowest value in the practical range, example 3 is an embodiment with the highest value in the practical range, example 3 is an embodiment with the lowest water outlet point, example 4 is a preferred embodiment corresponding to a specific system and its operation mode, and example 5 is an addition of an anoxic reaction system based on the example. Comparative example 1 is an embodiment in which the filler size is not satisfied, comparative example 2 is an embodiment in which the filler type is not satisfied, comparative example 3 is an embodiment in which the filler filling rate is not satisfied, and comparative example 4 is a specific system and its operation data in the case of using the filler of comparative example 2. Comparative example 5 is a specific system and its operation data when the height of the water outlet does not meet the range, and comparative example 6 is a specific system and its operation data when the filler size of comparative example 1 is used. Comparative example 7 is a specific system and its operation data in the case of using the filler filling rate of comparative example 3. As can be seen from comparison of examples and comparative examples, in the embodiment of examples, the effluent quality is better and the effluent is more stable.
The foregoing examples have shown only the preferred embodiments of the application, which are described in more detail and are not to be construed as limiting the scope of the application. It should be noted that modifications, improvements and substitutions can be made by those skilled in the art without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (5)
1. An integrated sewage treatment process is characterized in that: the method comprises the following steps:
pumping the sewage stored in the regulating reservoir into a sequencing batch biofilm reaction device through a lifting device, and then performing an anoxic reaction to obtain sewage after anoxic treatment;
carrying out an aerobic reaction on the sewage subjected to the anoxic treatment to obtain sewage subjected to the aerobic treatment;
directly discharging the sewage after the aerobic treatment through a water outlet without precipitation treatment;
the water outlet is arranged on the sequencing batch type biological film reaction device, and the distance between the water outlet and the bottom of the sequencing batch type biological film reaction device is 1/5 of the height of the sequencing batch type biological film reaction device;
a plurality of elastic fillers are placed in the sequencing batch biofilm reaction device, and the filling volume of the elastic fillers is 85% of the volume of the sequencing batch biofilm reaction device;
when the elastic filler is polyurethane filler, the polyurethane filler has a size of a cube with a side length of 20 mm;
the water inlet time is 15-30 min; the total reaction time of hypoxia and aerobic reaction is 3-5 hours; the drainage time is 10-15 min;
the sewage is rural sewage.
2. An integrated wastewater treatment process according to claim 1, wherein: the device also comprises a return pipeline arranged between the sequencing batch biofilm reaction device and the regulating and accumulating tank.
3. An integrated wastewater treatment process according to claim 1, wherein: the device also comprises a dosing device arranged in the sequencing batch biofilm reaction device.
4. An integrated wastewater treatment process according to claim 1, wherein: and the method also comprises the step of refluxing the supernatant of the sewage after the aerobic treatment to a regulating reservoir.
5. An integrated wastewater treatment process according to claim 1, wherein: and the method also comprises the step of adding medicines after the step of aerobic treatment.
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