CN106745744B - Sewage treatment method and sewage treatment system - Google Patents
Sewage treatment method and sewage treatment system Download PDFInfo
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- CN106745744B CN106745744B CN201611267279.5A CN201611267279A CN106745744B CN 106745744 B CN106745744 B CN 106745744B CN 201611267279 A CN201611267279 A CN 201611267279A CN 106745744 B CN106745744 B CN 106745744B
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- 239000010865 sewage Substances 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 251
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 130
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 65
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 26
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims abstract description 21
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 43
- 229910052698 phosphorus Inorganic materials 0.000 claims description 43
- 239000011574 phosphorus Substances 0.000 claims description 43
- 238000010992 reflux Methods 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 8
- 238000004065 wastewater treatment Methods 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 6
- 239000008213 purified water Substances 0.000 claims description 6
- 239000002351 wastewater Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 9
- 238000004659 sterilization and disinfection Methods 0.000 description 15
- 230000001276 controlling effect Effects 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 206010021143 Hypoxia Diseases 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 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
- 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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
-
- 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
- C02F2101/105—Phosphorus compounds
-
- 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
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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)
- Biodiversity & Conservation Biology (AREA)
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Abstract
The invention discloses a sewage treatment method and a sewage treatment system for removing nitrogen and having a good nitrate nitrogen removal effect. The method comprises the following operations: dividing sewage to be treated into a first water body and a second water body; secondly, introducing the first water body into an aerobic denitrification device for carrying out first denitrification treatment aiming at removing ammonia nitrogen, and then leading out a third water body containing nitrate nitrogen generated by the first denitrification treatment from the aerobic denitrification device; and thirdly, respectively introducing and mixing the second water body and the third water body in an anaerobic denitrification device to perform second denitrification treatment aiming at nitrate nitrogen removal, and then leading out a fourth water body subjected to the second denitrification treatment from the anaerobic denitrification device.
Description
Technical Field
The invention relates to a sewage treatment method and a system, in particular to a town domestic sewage treatment method and a system.
Background
At present, the urban domestic sewage treatment method generally adopts anaerobic, aerobic, anoxic and aerobic treatment processes. The sewage treatment method disclosed in the Chinese patent document CN101423294A belongs to the method.
The target water body treated by the method can generally reach the discharge standard that COD is less than or equal to 50mg/L, BOD5 and less than or equal to 10mg/L, ammonia nitrogen is less than or equal to 5mg/L and 8 mg/L, total nitrogen is less than or equal to 15mg/L, and total phosphorus is less than or equal to 0.5mg/L, SS and less than or equal to 15 mg/L; however, the concentration of total nitrogen and total phosphorus in the target water body is generally closer to the upper limit specified by the discharge standard; in addition, the total nitrogen in the target water body is generally nitrate nitrogen.
Although the above method can meet the discharge standard, the present inventors have been aware of the importance of developing a sewage treatment technology with better effect to meet the real urgency of improving the pollutant discharge index, though the research on the technical scheme for significantly improving the total nitrogen and total phosphorus removal effect is neglected in the art because the above method can meet the discharge standard.
Disclosure of Invention
The invention aims to provide a sewage treatment method and a sewage treatment system for removing nitrogen and having a good effect of removing nitrate nitrogen.
The sewage treatment method comprises the following operations:
dividing sewage to be treated into a first water body and a second water body;
secondly, introducing the first water body into an aerobic denitrification device for carrying out first denitrification treatment aiming at removing ammonia nitrogen, and then leading out a third water body containing nitrate nitrogen generated by the first denitrification treatment from the aerobic denitrification device;
and thirdly, respectively introducing and mixing the second water body and the third water body in an anaerobic denitrification device to perform second denitrification treatment aiming at nitrate nitrogen removal, and then leading out a fourth water body subjected to the second denitrification treatment from the anaerobic denitrification device.
The technical idea of the method is derived from specific analysis of the reasons of poor nitrogen removal effect of the existing sewage treatment method described in the background art and targeted technical innovation based on the analysis conclusion.
As the discharge standard has requirements on the concentration of total nitrogen and ammonia nitrogen in a target water body, for a sewage treatment method adopting an anaerobic, aerobic, anoxic and aerobic treatment process or a similar treatment process, the ammonia nitrogen is mainly converted into nitrate nitrogen at the front aerobic section through nitrification to be removed; the total nitrogen (including nitrate nitrogen) is mainly removed by denitrification in the anoxic section following the aerobic section. The principle of denitrification consists in: the denitrifying bacteria oxidize organic matters by using nitrogen in the nitrate as an electron acceptor under the condition of extremely low dissolved oxygen concentration or oxygen deficiency, so that the nitrogen in the nitrate is reduced into nitrogen. Therefore, denitrification requires a concentration of COD as a carbon source for denitrification. However, the anaerobic section and the aerobic section before the anoxic section consume a large amount of COD in the sewage, so that the anoxic section lacks a carbon source and further affects the denitrification effect, and therefore, the sewage treatment method using the anaerobic, aerobic, anoxic and aerobic treatment process or the similar treatment process is often poor in the effect of removing total nitrogen.
The sewage treatment method comprises the steps of firstly dividing the sewage to be treated into a first water body and a second water body, then introducing the first water body into an aerobic denitrification device for carrying out first denitrification treatment aiming at removing ammonia nitrogen, wherein the ammonia nitrogen is converted into nitrate nitrogen through nitrification under aerobic conditions and is removed, and meanwhile, a large amount of COD in the first water body is removed through oxidation; thereafter, the third water body is introduced into the anaerobic nitrogen removal apparatus, and further, the second water body which is separated from the sewage to be treated is introduced into the anaerobic nitrogen removal apparatus. Because the second water body is derived from the sewage to be treated and reserves COD with higher concentration, the COD concentration of the second water body mixed with the third water body is higher than that of the third water body, so that a carbon source is better guaranteed when the second denitrification treatment of the target including the denitrification nitrogen is carried out, and the denitrification effect can effectively remove the denitrification nitrogen in the water.
The above-mentioned sewage treatment method of the present invention may further comprise the operations of: fourthly, leading the fourth water body back to the aerobic denitrification device; and fifthly, leading out a fifth water body as a target water body source from the aerobic denitrification device. Therefore, the concentrations of ammonia nitrogen and total nitrogen in the fifth water body can be controlled more effectively.
The sewage treatment system of the present invention comprises:
the device comprises a to-be-treated sewage flow-dividing regulation and control device, a first water body output port and a second water body output port, wherein the to-be-treated sewage flow-dividing regulation and control device is provided with the first water body output port and the second water body output port;
the aerobic MBR device is provided with a raw water side first input port, a raw water side second input port, a raw water side first output port and a purified water side first output port; and
the anaerobic nitrogen removal device is provided with a first input port of the water body to be treated, a second input port of the water body to be treated and a first output port of the treated water body;
the first water body output port is connected with the first raw water side input port, the second water body output port is connected with the first to-be-treated water body input port, the second raw water side input port is connected with the first treated water body output port, the first raw water side output port is connected with the second to-be-treated water body input port, and a flow adjusting device is further arranged on a drainage channel formed between the first raw water side output port and the second to-be-treated water body input port.
When the system is operated, sewage to be treated is divided into a first water body and a second water body under the control of the dividing regulation and control device and flows out of the first water body output port and the second water body output port at regulated target flow rates respectively; the first water body enters the raw water side (namely the side of the liquid to be filtered of the filtering membrane) of the aerobic MBR device from the first inlet on the raw water side, and COD, BOD and ammonia nitrogen are effectively removed under aerobic conditions, wherein the ammonia nitrogen is converted into nitrate nitrogen through nitrification and removed; the third water body flowing out of the first output port on the raw water side of the aerobic MBR device enters the anaerobic denitrification device from the second input port of the water body to be treated at a regulated target flow rate, and in addition, the second water body flowing in from the first input port of the water body to be treated enters the anaerobic denitrification device, and the COD concentration of the mixed second water body and third water body is higher than that of the third water body because the second water body is derived from the sewage to be treated and reserves COD with higher concentration, and the carbon source is better ensured, so nitrate nitrogen in the water can be effectively removed in the anaerobic denitrification device through denitrification; and the fourth water body flowing out of the first treated water outlet returns to the raw water side of the aerobic MBR device through the second raw water side inlet, the sewage on the raw water side of the aerobic MBR device is treated by the aerobic MBR device, and finally, the fifth water body serving as the source of the target water body flows out of the first purified water side outlet of the purified water side (namely the filtered liquid side of the filtering membrane) of the aerobic MBR device.
The concentrations of ammonia nitrogen and total nitrogen in the fifth water body generated by the system can be effectively controlled.
The invention will be further described with reference to the accompanying drawings and specific embodiments. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic view of a sewage treatment system according to the present invention.
FIG. 2 is a schematic view of another sewage treatment system according to the present invention.
Detailed Description
First, related technical terms referred to in the application will be described. "COD" refers to chemical oxygen demand, which is a comprehensive indication of the amount of reducing substances such as organic substances in water; "BOD 5" is a 5-day biochemical oxygen demand, which is an overall index indicating the amount of aerobic pollutants such as organic substances in water; "TP" refers to total phosphorus; "SS" means suspended matter; "MBR" refers to a membrane bioreactor.
The sewage treatment system as shown in fig. 1 comprises a first pretreatment device 100 for removing solid impurities in sewage, a second pretreatment device 200 for removing total phosphorus in sewage, an aerobic nitrogen removal device 300, an anaerobic nitrogen removal device 400, a disinfection treatment device 500 and a to-be-treated sewage diversion regulation device 700.
The first pretreatment device 100 adopts a combination of a grid tank and a sand sedimentation tank, the second pretreatment device 200 adopts a phosphorus removal tank for removing total phosphorus by a chemical phosphorus removal method for sewage, the aerobic denitrification device 300 adopts an aerobic MBR device 310, the anaerobic denitrification device 400 adopts an anaerobic denitrification tank, and the disinfection device 500 adopts an ultraviolet disinfection tank.
Of course, the combination of the grating tank and the sand settling tank is just a conventional choice for the first pretreatment device 100, wherein the grating tank functions to intercept floating garbage in water and the sand settling tank functions to settle silt in sewage. It is easy to encounter that the first pretreatment device 100 may also optionally use other suitable devices such as a ceramic filter or the like to remove solid impurities from the wastewater. Similarly, the second pretreatment device 200 and other apparatuses may be replaced by other apparatuses having the same or similar functions.
The flow-dividing regulating device 700 comprises pipelines respectively connected with the water outlets of the phosphorus removal tanks so as to respectively introduce the sewage to be treated flowing out of the phosphorus removal tanks into the aerobic nitrogen removal device 300 and the anaerobic nitrogen removal device 400, and control valves arranged on the pipelines. The to-be-treated sewage from the phosphorus removal tank can be divided into a first water body with controllable flow rate and used for being guided to the aerobic nitrogen removal device 300 and a second water body used for being guided to the anaerobic nitrogen removal device 400 through the flow dividing and controlling device 700, and the first water body and the second water body respectively flow out from the first water body output port and the second water body output port of the flow dividing and controlling device 700.
The aerobic MBR device 310 is provided with a raw water side first input port, a raw water side second input port, a raw water side first output port and a purified water side first output port; the anaerobic denitrification apparatus 400 has a first inlet for the body of water to be treated, a second inlet for the body of water to be treated and a first outlet for the treated body of water.
A first water body output port of the diversion regulation and control device 700 is connected with a first raw water side input port of the aerobic MBR device 310, and a second water body output port of the diversion regulation and control device 700 is connected with a first water body input port to be treated of the anaerobic denitrification device 400; the raw water side second input port of the aerobic MBR device 310 is connected with the treated water first output port of the anaerobic nitrogen removal device 400; the first output port on the raw water side of the aerobic MBR device 310 is connected with the second input port of the water body to be treated of the anaerobic denitrification device 400, and a flow regulating device is further arranged on a drainage channel formed between the first output port on the raw water side and the second input port of the water body to be treated. In addition, the first outlet of the clean water side of the aerobic MBR device 310 is connected with the ultraviolet disinfection tank.
A sewage treatment method using the sewage treatment system shown in FIG. 1 comprises the following steps:
1) carrying out first pretreatment operation for removing solid impurities in the sewage through a grid tank and a desilting tank;
2) introducing the sewage from which the solid impurities are removed into a phosphorus removal tank to carry out a second pretreatment operation for removing total phosphorus in the sewage, wherein the second pretreatment operation adopts a chemical phosphorus removal method, namely, a phosphorus removal agent is added into the sewage and is uniformly mixed in the sewage under a specific reaction condition to carry out chemical reaction phosphorus removal, so that a higher phosphorus removal rate can be achieved;
3) the sewage to be treated after the dephosphorization treatment in the dephosphorization pool is divided into a first water body and a second water body by the flow dividing and controlling device 700 and flows out from a first water body output port and a second water body output port of the flow dividing and controlling device 700 at regulated target flow rates respectively;
4) the first water body enters the raw water side of the aerobic MBR device 310 from a first raw water side input port, COD, BOD and ammonia nitrogen are effectively removed under aerobic conditions, wherein the ammonia nitrogen is converted into nitrate nitrogen through nitrification to be removed (namely, first denitrification treatment), and then a third water body containing the nitrate nitrogen generated by the first denitrification treatment is led out from a first raw water side output port of the aerobic MBR device 310;
5) the third water body enters the anaerobic nitrogen removal device 400 (anaerobic nitrogen removal tank) from the second inlet of the water body to be treated at the adjusted target flow rate, and in addition, the second water body which flows in from the first inlet of the water body to be treated enters the anaerobic nitrogen removal device 400, and the COD concentration of the second water body mixed with the third water body is improved compared with the COD concentration of the third water body because the second water body is derived from the sewage to be treated and retains higher-concentration COD, so that nitrate nitrogen in water can be effectively removed (namely, the second nitrogen removal treatment) in the anaerobic nitrogen removal device 400 through denitrification, and then the fourth water body after the second nitrogen removal treatment is led out from the first outlet of the treated water body of the anaerobic nitrogen removal device 400;
6) the fourth water body returns to the raw water side of the aerobic MBR device 310 through a second inlet on the raw water side, and the sewage on the raw water side of the aerobic MBR device 310 is treated by the aerobic MBR device 310 and finally flows out of a fifth water body from a first outlet on the clean water side of the aerobic MBR device 310;
7) and introducing the fifth water body into an ultraviolet disinfection tank for disinfection and sterilization to obtain the target water body.
In step 1) of the above sewage treatment method, the ratio of the flow rate of the first water body to the flow rate of the sewage to be treated is a split ratio, and the split ratio is generally 50% to 90%, such as 60%, 70%, 80%, and the like. In addition, the ratio of the flow rate of the third water body to the flow rate of the first water body extracted in the step 3) is a reflux ratio, and the reflux ratio is generally 30% -100%, such as 40%, 50%, 60%, 70%, 80%, 90%, and the like.
An important feature of the above-described wastewater treatment method is that the split ratio and reflux ratio can be flexibly adjusted according to the conditions of the wastewater to be treated or the first water body. If the COD value of the sewage to be treated or the first water body is higher, the split ratio can be reduced, so that the flow of the first water body is reduced, the flow of the second water body is relatively increased, more anaerobic nitrogen removal tanks are used for removing a large amount of COD through anaerobic treatment, and the load of the aerobic MBR device 301 is reduced; conversely, when the COD value is lower, the split ratio can be increased. If the ammonia nitrogen and the total nitrogen value of the sewage to be treated or the first water body are lower, the reflux ratio can be reduced, so that the sewage treatment efficiency is accelerated; on the contrary, if the ammonia nitrogen and the total nitrogen value of the sewage to be treated or the first water body are higher, the reflux ratio can be increased.
Experiments show that when the COD value of the sewage to be treated or the first water body is higher than 250mg/L in the first operation, the split flow ratio is set to be 50-60%, so that a large amount of COD can be removed by utilizing the anaerobic nitrogen removal tank in an anaerobic mode. And when the COD value of the sewage to be treated or the first water body in the first operation is lower than 250mg/L, the split flow ratio is preferably set to be 60-90%.
When the ammonia nitrogen value of the sewage to be treated or the first water body is lower than 25mg/L and the total nitrogen value is lower than 60mg/L, the reflux ratio is preferably 30-60 percent, thereby achieving higher sewage treatment efficiency. When the ammonia nitrogen value of the sewage or the first water body to be treated is higher than 25mg/L or the total nitrogen value is higher than 60mg/L, the reflux ratio is generally 60-90%.
The sewage treatment system as shown in fig. 2 comprises a first pretreatment device 100 for removing solid impurities in sewage, a second pretreatment device 200 for removing total phosphorus in sewage, an aerobic denitrification device 300, an anaerobic denitrification device 400, a disinfection treatment device 500, a to-be-treated sewage diversion regulation device 700 and an aerobic MBR device 600.
The first pretreatment device 100 adopts a combination of a grid tank and a sand sedimentation tank, the second pretreatment device 200 adopts a phosphorus removal tank for removing total phosphorus by a chemical phosphorus removal method for sewage, the aerobic denitrification device 300 adopts an aerobic MBR device 310, the anaerobic denitrification device 400 adopts an anaerobic denitrification tank, and the disinfection device 500 adopts an ultraviolet disinfection tank.
The flow-dividing regulating device 700 comprises pipelines respectively connected with the water outlets of the phosphorus removal tanks so as to respectively introduce the sewage to be treated flowing out of the phosphorus removal tanks into the aerobic nitrogen removal device 300 and the anaerobic nitrogen removal device 400, and control valves arranged on the pipelines. The to-be-treated sewage from the phosphorus removal tank can be divided into a first water body with controllable flow rate and used for being guided to the aerobic nitrogen removal device 300 and a second water body used for being guided to the anaerobic nitrogen removal device 400 through the flow dividing and controlling device 700, and the first water body and the second water body respectively flow out from the first water body output port and the second water body output port of the flow dividing and controlling device 700.
The aerobic MBR device 310 is provided with a first raw water side input port and a first purified water side output port; the anaerobic denitrification device 400 is provided with a first input port of the water body to be treated, a second input port of the water body to be treated and a first output port of the treated water body; the aerobic MBR device 600 is provided with a raw water side first input port and a clean water side first output port.
A first water body output port of the diversion regulation and control device 700 is connected with a first raw water side input port of the aerobic MBR device 310, and a second water body output port of the diversion regulation and control device 700 is connected with a first water body input port to be treated of the anaerobic denitrification device 400; a first output port on the raw water side of the aerobic MBR device 310 is connected with a second input port of the water body to be treated of the anaerobic nitrogen removal device 400; the treated water first output port of the anaerobic denitrification apparatus 400 is connected to the raw water side first input port of the aerobic MBR apparatus 600. In addition, the first outlet on the clean water side of the aerobic MBR device 600 is connected to the ultraviolet disinfection tank.
A sewage treatment method using the sewage treatment system shown in FIG. 1 comprises the following steps:
1) carrying out first pretreatment operation for removing solid impurities in the sewage through a grid tank and a desilting tank;
2) introducing the sewage from which the solid suspended matters are removed into a phosphorus removal tank to carry out a second pretreatment operation for removing total phosphorus in the sewage, wherein the second pretreatment operation adopts a chemical phosphorus removal method, namely, a phosphorus removal agent is added into the sewage and is uniformly mixed in the sewage under a specific reaction condition to carry out chemical reaction phosphorus removal, so that a higher phosphorus removal rate can be achieved;
3) the sewage to be treated after the dephosphorization treatment in the dephosphorization pool is divided into a first water body and a second water body by the flow dividing and controlling device 700 and flows out from a first water body output port and a second water body output port of the flow dividing and controlling device 700 at regulated target flow rates respectively;
4) the first water body enters the raw water side of the aerobic MBR device 310 from a first raw water side input port, COD, BOD and ammonia nitrogen are effectively removed under aerobic conditions, wherein the ammonia nitrogen is converted into nitrate nitrogen through nitrification to be removed (namely, first denitrification treatment), and then a third water body containing the nitrate nitrogen generated by the first denitrification treatment is led out from a first raw water side output port of the aerobic MBR device 310;
5) the third water body enters the anaerobic nitrogen removal device 400 (anaerobic nitrogen removal tank) from the second input port of the water body to be treated, and in addition, the second water body which flows in from the first input port of the water body to be treated also enters the anaerobic nitrogen removal device 400, and the COD concentration of the second water body mixed with the third water body is improved compared with the COD concentration of the third water body because the second water body is derived from the sewage to be treated and reserves higher COD, so nitrate nitrogen in the water can be effectively removed (namely, the second nitrogen removal treatment) in the anaerobic nitrogen removal device 400 through denitrification, and then the fourth water body after the second nitrogen removal treatment is led out from the first output port of the treated water body of the anaerobic nitrogen removal device 400;
6) the fourth water body enters the raw water side of the aerobic MBR device 600, and the sewage on the raw water side of the aerobic MBR device 600 is treated by the aerobic MBR device 310 and finally flows out of the fifth water body from the first output port on the clean water side of the aerobic MBR device 600;
7) and introducing the fifth water body into an ultraviolet disinfection tank for disinfection and sterilization to obtain the target water body.
Example 1
A certain town domestic sewage treatment plant adopts the sewage treatment system shown in figure 1. The water inlet amount of the plant is 100 tons/h, and the water quality index COD is as follows: 200mg/L, BOD 5: 80mg/L, ammonia nitrogen: 20mg/L, total nitrogen: 50mg/L, TP: 3mg/L, SS: 100 mg/L. The sewage flows through a grid pond, floating garbage is intercepted by a grid machine, the sewage is lifted into a phosphorus removal pond by a lifting pump after silt is removed in a sedimentation pond, 50KG dry powder phosphorus removal agent (JX-305 phosphorus removal agent produced by Jiangxi Huihai environmental protection science and technology limited company is adopted, the phosphorus removal agent is directly put into the phosphorus removal pond according to two ten-thousandth of the proportion of the dry powder to water, a stirrer of the phosphorus removal pond operates to ensure that the phosphorus removal agent is fully dissolved in the water, the phosphorus removal agent fully reacts with the water to remove TP, the TP removal rate can reach more than 90 percent, the TP of the water discharged from the phosphorus removal pond is less than or equal to 0.3mg/L, because the water inlet is higher, 70 percent of the water discharged from the phosphorus removal pond enters an aerobic MBR pond, 30 percent of the water discharged from the anaerobic MBR pond, and the. The anaerobic denitrification pool can carry out anaerobic digestion on COD (chemical oxygen demand) and carry out denitrification to remove total nitrogen, the COD removal efficiency by anaerobic treatment can reach more than 60%, and the treated low-concentration sewage enters the aerobic MBR device to reduce the treatment load of the aerobic MBR device. In the anaerobic denitrification tank, nitrate nitrogen is combined with organic matters under the action of denitrifying bacteria, so that the total nitrogen can be well removed, the removal effect can reach over 80 percent, and the index of the total nitrogen of effluent can be guaranteed to be below 10 mg/L. The aerobic MBR device is provided with a fan for providing aeration, has good removal rate on COD, BOD and ammonia nitrogen in an aerobic state, and the ammonia nitrogen is oxidized into nitrite and nitrate. The aerobic MBR device discharges water through the MBR membrane, the COD removal rate can reach more than 90 percent, the ammonia nitrogen removal rate can reach more than 93 percent, BOD5 can reach below 6mg/L, and the SS of the discharged water can reach below 3 mg/L. After the sewage is treated by the system, the indexes of the sewage reaching the ultraviolet disinfection tank can reach COD less than or equal to 30mg/L, BOD less than or equal to 6mg/L, ammonia nitrogen less than or equal to 1.5mg/L, total nitrogen less than or equal to 10mg/L, TP less than or equal to 0.3mg/L and SS less than or equal to 3 mg/L.
Claims (9)
1. The sewage treatment method is characterized by comprising the following operations:
dividing sewage to be treated into a first water body and a second water body;
secondly, introducing the first water body into an aerobic denitrification device (300) for carrying out first denitrification treatment aiming at removing ammonia nitrogen, and then leading out a third water body containing nitrate nitrogen generated by the first denitrification treatment from the aerobic denitrification device (300);
and thirdly, respectively introducing and mixing the second water body and the third water body in an anaerobic nitrogen removal device (400) to perform second nitrogen removal treatment aiming at nitrate nitrogen removal, and then leading out a fourth water body subjected to the second nitrogen removal treatment from the anaerobic nitrogen removal device (400).
Fourthly, the fourth water body is led back to the aerobic nitrogen removal device (300); and
and fifthly, leading out a fifth water body as a target water body source from the aerobic denitrification device (300).
2. The wastewater treatment method according to claim 1, wherein the aerobic membrane bioreactor (300) is an aerobic Membrane Bioreactor (MBR), the third water is introduced from the raw water side of the aerobic MBR, the fourth water is introduced back to the raw water side of the aerobic MBR, and the fifth water is introduced from the clean water side of the aerobic MBR.
3. The wastewater treatment method according to claim 1, characterized in that: the method comprises a pretreatment process, and the sewage treated by the pretreatment process is led out to be used as the sewage to be treated in the first operation; the pretreatment process includes a first pretreatment operation for removing solid impurities from the wastewater.
4. The wastewater treatment method according to claim 1, characterized in that: the method comprises a pretreatment process, and the sewage treated by the pretreatment process is led out to be used as the sewage to be treated in the first operation; the pretreatment process includes a second pretreatment operation for removing total phosphorus from the wastewater.
5. The wastewater treatment method according to claim 4, characterized in that: the second pretreatment operation removes at least total phosphorus in the wastewater by chemical phosphorus removal.
6. The wastewater treatment method according to any one of claims 1 to 5, characterized in that: and the ratio of the flow of the first water body to the flow of the sewage to be treated in the first operation is the split ratio, and the split ratio is 50-90%.
7. The wastewater treatment method according to claim 6, characterized in that: and if the ratio of the flow rate of the third water body to the flow rate of the first water body introduced in the second operation is a reflux ratio, the reflux ratio is 30-100%.
8. The wastewater treatment method according to claim 7, characterized in that: when the COD value of the sewage to be treated or the first water body is higher than 250mg/L in the first operation, the split ratio is 50-60 percent; when the ammonia nitrogen value of the sewage or the first water body to be treated is lower than 25mg/L and the total nitrogen value is lower than 60mg/L, the reflux ratio is 30-60 percent.
9. Sewage treatment system, its characterized in that includes: the sewage treatment system comprises a to-be-treated sewage diversion regulation and control device (700), wherein the diversion regulation and control device (700) is provided with a first water body output port and a second water body output port; the aerobic MBR device (310) is provided with a raw water side first input port, a raw water side second input port, a raw water side first output port and a purified water side first output port; and an anaerobic nitrogen removal device (400), the anaerobic nitrogen removal device (400) having a first input port for the water body to be treated, a second input port for the water body to be treated and a first output port for the treated water body; the first water body output port is connected with the first raw water side input port, the second water body output port is connected with the first to-be-treated water body input port, the second raw water side input port is connected with the first treated water body output port, the first raw water side output port is connected with the second to-be-treated water body input port, and a flow adjusting device is further arranged on a drainage channel formed between the first raw water side output port and the second to-be-treated water body input port.
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