CN110577337A - Domestic sewage treatment method - Google Patents
Domestic sewage treatment method Download PDFInfo
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- CN110577337A CN110577337A CN201910963561.4A CN201910963561A CN110577337A CN 110577337 A CN110577337 A CN 110577337A CN 201910963561 A CN201910963561 A CN 201910963561A CN 110577337 A CN110577337 A CN 110577337A
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- 239000010865 sewage Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000000571 coke Substances 0.000 claims abstract description 19
- 238000000926 separation method Methods 0.000 claims abstract description 15
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 8
- 230000014759 maintenance of location Effects 0.000 claims description 14
- 239000010802 sludge Substances 0.000 claims description 10
- 238000001179 sorption measurement Methods 0.000 claims description 7
- 239000002351 wastewater Substances 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 4
- 238000010992 reflux Methods 0.000 claims description 4
- 238000005374 membrane filtration Methods 0.000 claims description 3
- 238000003672 processing method Methods 0.000 claims 7
- 230000000694 effects Effects 0.000 abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 8
- 229910052698 phosphorus Inorganic materials 0.000 description 8
- 239000011574 phosphorus Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 241000894006 Bacteria Species 0.000 description 3
- 238000010170 biological method Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- 238000000053 physical method Methods 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 208000034699 Vitreous floaters Diseases 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000012510 hollow fiber Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 238000012423 maintenance Methods 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
- 239000005416 organic matter Substances 0.000 description 1
- 125000001477 organic nitrogen group Chemical group 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 244000052769 pathogen Species 0.000 description 1
- 230000001717 pathogenic effect Effects 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- 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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- 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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention discloses a method for treating domestic sewage, which comprises the following steps: (1) treating domestic sewage in a grid, and treating the sewage treated by the grid in an oil separation tank to regulate water quantity and homogenize water quality; (2) the sewage lifted by the oil separation tank enters the sewage A2Treating in an O biochemical pool; (3) a. the2The effluent of the O biochemical tank enters an MBR tank for treatment; (4) performing advanced treatment on effluent of the MBR tank by using active coke; (5) and (3) the sewage treated by the active coke enters an ultraviolet sterilization and disinfection tank for sterilization and disinfection to obtain treated water, and the treated water meets the discharge standard of III-class water on the earth surface. The method for treating domestic sewage to the III-class water standard on the ground surface has strong operability and good treatment effect, and the effluent meets the III-class water discharge standard on the ground surface.
Description
Technical Field
the invention relates to a method for treating domestic sewage to the III-class water standard on the ground surface.
Background
Domestic sewage is mainly discharged water produced by various kitchen water, washing water and toilet water used in human life. If the waste water is directly discharged without being treated, pathogen pollution, aerobic organic matter pollution, water eutrophication pollution and the like can be caused. In this environment, the comprehensive treatment of domestic sewage is under great pressure. In the process adopted by urban sewage plants in China, various activated sludge methods are still used as the methodThe main stream. While the conventional domestic sewage treatment is mainly classified into a physical method, a chemical method, and a biological method. The physical method is mainly to remove insoluble suspended substances in water, and the chemical method is to add chemical agents into wastewater to achieve the water purification effect through chemical reaction. The biological method is a technology for degrading organic matters by utilizing the action of microorganisms, and is mainly used for removing organic matters, ammonia nitrogen and the like in water. Among them, the biological method is currently most advantageous in use. A. the2O is a common secondary sewage treatment process, has the function of synchronous nitrogen and phosphorus removal, can be used for secondary sewage treatment or tertiary sewage treatment, and has good nitrogen and phosphorus removal effect. MBR mainly replaces the water treatment technology of a secondary sedimentation tank in the traditional activated sludge process by combining the activated sludge process and the membrane separation technology. The activated coke is a porous carbonaceous substance, is similar to an adsorbent of activated carbon, has wide application space in the field of sewage treatment, and mainly serves to remove pollutants such as COD, chromaticity, colloid, heavy metals and the like.
In recent years, with the rapid development of sewage treatment technology, the pollutant discharge standard of sewage plants is continuously improved, and the treatment standard of domestic sewage is promoted from first grade A to surface III type water, wherein the surface III type water standard is BOD5≤4mg/L；CODcr≤20mg/L；SS≤10mg/L；NH4N is less than or equal to 1 mg/L; the total nitrogen is less than or equal to 1 mg/L; the total phosphorus is less than or equal to 0.2 mg/L. Therefore, the method for treating the domestic sewage by the integrated treatment system with reliable operation has important practical significance.
Disclosure of Invention
The invention aims to provide a method for treating domestic sewage to the III-class water standard on the ground surface, which has strong operability and good treatment effect, and the discharged water meets the III-class water discharge standard on the ground surface.
In order to meet the requirements, the technical scheme of the invention is as follows:
A method for treating domestic sewage comprises the following steps:
(1) Treating domestic sewage in a grid, and treating the sewage treated by the grid in an oil separation tank to regulate water quantity and homogenize water quality; the purpose of the step is to intercept large floating objects and large granular impurities in the sewage by using a grid, and meanwhile, because the sewage has uneven water quantity and water quality, an oil separation tank is arranged before the sewage enters a subsequent treatment device to adjust the water quantity and homogenize the water quality;
(2) The sewage lifted by the oil separation tank enters the sewage A2treating in an O biochemical pool; the purpose of this step is to utilize A2removing nitrogen and phosphorus; a is described2the O biochemical pool is composed of an anaerobic pool, an anoxic pool and an aerobic pool in sequence, an anaerobic environment is maintained in the anaerobic pool, phosphorus-accumulating bacteria are enabled to fully release phosphorus in the anaerobic pool, sewage in the anaerobic pool automatically flows into the anoxic pool, the sewage is hydrolyzed and acidified in the anaerobic pool, the load of subsequent treatment facilities can be effectively reduced, and the nitrification process is carried out in the rear-stage aerobic pool to achieve the purpose of denitrification;
(3)A2The effluent of the O biochemical tank enters an MBR tank for treatment;
(4) Performing advanced treatment on effluent of the MBR tank by using active coke; the step aims to remove macromolecular refractory organic matters, organic nitrogen and organic phosphorus by adsorption by utilizing the adsorption effect of the active coke;
(5) And (4) the sewage treated by the active coke enters an ultraviolet sterilization and disinfection tank for sterilization and disinfection to obtain treated water. The treated water meets the discharge standard of class III water on the earth surface.
Wherein the domestic sewage is CODcr＝220-300mg/L；BOD5＝50-150mg/L；NH4-15-30 mg/L domestic sewage.
Preferably, the grid gap in step (1) is 1-5 mm.
Preferably, in the step (1), the hydraulic retention time of the sewage in the oil separation tank is 6-20 h.
preferably, in the step (2), the hydraulic retention time of the sewage in the anaerobic tank is 1.5-3h, the hydraulic retention time in the anoxic tank is 2-6h, and the hydraulic retention time in the aerobic tank is 4-8 h.
Preferably, the bottom of the aerobic tank in the step (2) is provided with a microporous aeration disc.
Preferably, in the step (3), an MBR membrane and a sludge reflux pump are arranged in the MBR tank, and after membrane filtration is carried out on sewage, high-concentration activated sludge in raw water flows back to the anaerobic tank and the anoxic tank.
Preferably, in the step (3), the hydraulic retention time in the MBR tank is 1-3 h.
Preferably, in the step (4), the effluent of the MBR tank passes through an active coke adsorption column from bottom to top, and the adding amount of the active coke is 0.05-0.12t/m3And (4) waste water.
Preferably, in step (5), the intensity of the ultraviolet light is 5 to 20W/cm2the irradiation time is 0.5-2 h.
preferably, the treatment method consists of steps (1) to (5).
Preferably, each equipment is controlled by adopting a PLC full-automatic control operation program to realize automatic operation, and particularly, the automatic operation is realized by controlling mutual switching of a submersible sewage lifting pump and a fan of a grating and an oil separation tank, a sludge reflux pump of an MBR tank, an MBR self-priming pump, an MBR backwashing pump, an MBR dosing device and an ultraviolet sterilizer.
Compared with the prior art, the invention has the advantages that:
The integrated treatment method for upgrading domestic sewage from the first-grade A to the third-class water standard on the ground surface has the advantages of strong operability, small occupied area and low treatment cost, and the quality of effluent can completely reach the III-class water discharge standard on the ground surface.
Drawings
FIG. 1 is a process flow diagram
Detailed Description
the technical scheme of the invention is further explained by combining the specific example of the attached figure 1.
Examples
The water quality indexes of the domestic sewage treated by the experiment are as follows: CODcr＝300mg/L；BOD5＝150mg/L；NH4-N＝20mg/L。
The domestic sewage enters the grating to intercept larger suspended matters or floaters, so that the blockage of a water pump, a drain pipe and a subsequent treatment structure is prevented, and the normal operation of treatment facilities and equipment is ensured. The grid gap is 5mm, and the grid is provided with one grid, and the grid slag is manually cleaned.
The sewage after the grid treatment enters an oil separation tank, 2 submersible lift pumps are arranged in the oil separation tank, the effective water depth of the tank is 3.5m, and the hydraulic retention time is 15 h. The oil separation tank removes most of floating oil in water by utilizing the characteristics of different oil-water specific gravity and complementary compatibility.
in A2In the O biochemical pool, the sewage lifted by the oil separation pool firstly enters an anaerobic pool, the effective water depth of the anaerobic pool is 2.7m, and the effective volume is 25m3The anaerobic environment is maintained in the anaerobic tank, phosphorus-accumulating bacteria can fully release phosphorus in the anaerobic tank, conditions are created for the phosphorus-accumulating bacteria to fully absorb phosphorus in the aerobic tank, and the hydraulic retention time is 2 hours. Sewage in the anaerobic tank automatically flows into an anoxic tank, the effective water depth of the anoxic tank is 2.7m, and the effective volume is 25m3The sewage is hydrolyzed and acidified in the pool, so that the load of subsequent treatment facilities can be effectively reduced, and the hydraulic retention time is 4 hours. Sewage in the anoxic tank automatically flows into the biological contact oxidation tank in the aerobic tank, the effective water depth of the aerobic tank is 2.7m, and the effective volume is 75m3The bottom of the tank is provided with a micropore aeration disc, the hydraulic retention time is 6 hours, and most COD is decomposed and removed in the tank. COD of effluent water qualitycr＝54mg/L；BOD5＝22.5mg/L；NH4-N＝4mg/L。
A2The effluent O enters an MBR system and stays for 2 hours, the effective water depth of an MBR tank is 2.7m, a PVDF hollow fiber MBR membrane and a sludge reflux pump are placed in the tank, a certain maintenance space is reserved for membrane filtration, high-concentration active sludge in raw water flows back to an anaerobic tank and an anoxic tank, and supernatant fluid which flows back from the MBR tank has NO3the-N is denitrified in the anoxic tank and is subjected to the nitrification process in the later-stage aerobic tank, so that the aim of denitrification is fulfilled. Water quality COD of MBR systemcr＝10.8mg/L；BOD5＝2mg/L；NH4-N＝1.2mg/L。
The effluent of the MBR system enters an active coke adsorption column, the active coke adsorption column is used for producing active coke with an iodine value of 500-700 mg/g by taking coal as a raw material in a mode of from bottom to top, and the adding amount of the active coke is 0.1t/m3The removal rate of each pollutant of the wastewater is up to more than 80 percent. COD of produced watercr＝2.16mg/L；BOD5＝0.37mg/L；NH4-N ═ 0.24 mg/L. WhereinThe active coke can be regenerated: cracking at 800 deg.c, opening active coke pore channel, recovering performance near 100%, and reusing with regeneration rate of about 70%.
the effluent of the MBR tank passes through a suction pump, then passes through active coke for adsorption, and then enters an ultraviolet sterilization disinfection tank, the length, the width and the height are 4 x 2 x 1m, and the intensity of ultraviolet light is 10W/cm2The irradiation time is 1h, and the treated water completely reaches the discharge standard of III-class water on the earth surface: BOD5≤4mg/L；CODcr≤20mg/L；NH4-N≤1mg/L。
It should be understood that the above-mentioned examples are only for the purpose of clearly illustrating the present invention, and are not intended to set the limitations on the implementation of the present invention. All equivalent changes and modifications made within the scope of the present invention are within the protection scope of the present invention.
Claims (10)
1. a method for treating domestic sewage comprises the following steps:
(1) Treating domestic sewage in a grid, and treating the sewage treated by the grid in an oil separation tank to regulate water quantity and homogenize water quality;
(2) The sewage lifted by the oil separation tank enters the sewage A2Treating in an O biochemical pool;
(3)A2The effluent of the O biochemical tank enters an MBR tank for treatment;
(4) Performing advanced treatment on effluent of the MBR tank by using active coke;
(5) And (3) the sewage treated by the active coke enters an ultraviolet sterilization and disinfection tank for sterilization and disinfection to obtain treated water, and the treated water meets the discharge standard of III-class water on the earth surface.
2. The process of claim 1, wherein: the domestic sewage is CODcr＝220-300mg/L；BOD5＝50-150mg/L；NH4-15-30 mg/L domestic sewage.
3. The processing method according to claim 1 or 2, characterized by: the grid gap in the step (1) is 1-5 mm.
4. The processing method according to claim 1 or 2, characterized by: in the step (1), the hydraulic retention time of the sewage in the oil separation tank is 6-20 h.
5. the processing method according to claim 1 or 2, characterized by: in the step (2), the hydraulic retention time of the sewage in the anaerobic tank is 1.5-3h, the hydraulic retention time in the anoxic tank is 2-6h, and the hydraulic retention time in the aerobic tank is 4-8 h.
6. The processing method according to claim 1 or 2, characterized by: in the step (3), an MBR membrane and a sludge reflux pump are arranged in the MBR tank, and high-concentration active sludge in raw water flows back to the anaerobic tank and the anoxic tank after membrane filtration of sewage; the hydraulic retention time in the MBR tank is 1-3 h.
7. The processing method according to claim 1 or 2, characterized by: in the step (4), the effluent of the MBR tank passes through an active coke adsorption column from bottom to top, and the adding amount of the active coke is 0.05-0.12t/m3And (4) waste water.
8. The processing method according to claim 1 or 2, characterized by: in the step (5), the intensity of the ultraviolet light is 5-20W/cm2The irradiation time is 0.5-2 h.
9. The process of any one of claims 1 to 8, wherein: the treatment method comprises the steps (1) to (5).
10. The processing method according to claim 1 or 2, characterized by: and a PLC full-automatic control operation program is adopted to control each device to realize automatic operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910963561.4A CN110577337A (en) | 2019-10-11 | 2019-10-11 | Domestic sewage treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910963561.4A CN110577337A (en) | 2019-10-11 | 2019-10-11 | Domestic sewage treatment method |
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| CN110577337A true CN110577337A (en) | 2019-12-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111592110A (en) * | 2020-06-29 | 2020-08-28 | 中材建设有限公司 | Small-sized domestic sewage treatment system and sewage treatment process |
| CN111908608A (en) * | 2020-07-07 | 2020-11-10 | 同济大学 | Multi-section variable membrane bioreactor sewage treatment system and use method thereof |
| CN113233720A (en) * | 2021-06-24 | 2021-08-10 | 浙江工业大学 | Integrated treatment method for upgrading domestic sewage from first-level A to surface III-class water standard |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111592110A (en) * | 2020-06-29 | 2020-08-28 | 中材建设有限公司 | Small-sized domestic sewage treatment system and sewage treatment process |
| CN111908608A (en) * | 2020-07-07 | 2020-11-10 | 同济大学 | Multi-section variable membrane bioreactor sewage treatment system and use method thereof |
| CN113233720A (en) * | 2021-06-24 | 2021-08-10 | 浙江工业大学 | Integrated treatment method for upgrading domestic sewage from first-level A to surface III-class water standard |
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