CN115490352A - Process for improving discharge standard of nitrogen and phosphorus in secondary biochemical effluent of municipal domestic sewage - Google Patents
Process for improving discharge standard of nitrogen and phosphorus in secondary biochemical effluent of municipal domestic sewage Download PDFInfo
- Publication number
- CN115490352A CN115490352A CN202110682308.9A CN202110682308A CN115490352A CN 115490352 A CN115490352 A CN 115490352A CN 202110682308 A CN202110682308 A CN 202110682308A CN 115490352 A CN115490352 A CN 115490352A
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- Prior art keywords
- tank
- phosphorus
- nitrogen
- water
- removing agent
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 33
- 239000011574 phosphorus Substances 0.000 title claims abstract description 33
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 239000010865 sewage Substances 0.000 title claims abstract description 23
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 23
- 239000007800 oxidant agent Substances 0.000 claims abstract description 17
- 230000001590 oxidative effect Effects 0.000 claims abstract description 17
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 238000000926 separation method Methods 0.000 claims abstract description 11
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 8
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 claims abstract 3
- 238000003756 stirring Methods 0.000 claims description 6
- 239000010802 sludge Substances 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 claims 3
- 238000004062 sedimentation Methods 0.000 claims 1
- 239000000460 chlorine Substances 0.000 abstract description 12
- 229910052801 chlorine Inorganic materials 0.000 abstract description 12
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract description 11
- 229910019142 PO4 Inorganic materials 0.000 abstract description 5
- 239000010452 phosphate Substances 0.000 abstract description 5
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical class O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 abstract description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- JRIGSKUONNQDID-UHFFFAOYSA-K [P].[Al](Cl)(Cl)Cl Chemical compound [P].[Al](Cl)(Cl)Cl JRIGSKUONNQDID-UHFFFAOYSA-K 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 2
- 238000010907 mechanical stirring Methods 0.000 description 2
- 239000002352 surface water Substances 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 1
- 241000192710 Microcystis aeruginosa Species 0.000 description 1
- 230000003851 biochemical process Effects 0.000 description 1
- 125000001309 chloro group Chemical group Cl* 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052816 inorganic phosphate Inorganic materials 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Images
Classifications
-
- 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
- C02F1/586—Treatment of water, waste water, or sewage by removing specified dissolved compounds by removing ammoniacal nitrogen
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- 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
-
- 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
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- 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)
- Removal Of Specific Substances (AREA)
- Activated Sludge Processes (AREA)
Abstract
The invention relates to a process for improving the discharge standard of nitrogen and phosphorus in the secondary biochemical effluent of municipal domestic sewage, wherein the secondary biochemical effluent of the municipal domestic sewage sequentially enters an oxidant adding tank (1), a phosphorus removing agent adding tank (2), a separation reaction tank (3) and a water outlet tank (4); the reaction is as follows: chlorine is added into the oxidant adding pool (1), organic matters in the chlorine are oxidized, the COD value in water is reduced, meanwhile, the chlorine reacts with ammonia nitrogen to generate an oxidation-like reaction, most of the ammonia nitrogen is oxidized to generate nitrogen, and the nitrogen overflows from the system; meanwhile, excessive chlorine gas oxidizes part of organic phosphorus into phosphate substances while oxidizing organic matters; adding a phosphorus removing agent such as aluminum chloride into the phosphorus removing agent adding tank (2), and reacting the aluminum chloride with phosphate radicals to generate insoluble aluminum phosphate salts; residual chlorine in the separation reaction tank (3) continuously oxidizes organic matters in the water, insoluble aluminum phosphate generated in the phosphorus removing agent adding tank (2) is removed in the separation reaction tank (3), and effluent enters an effluent tank (4) to achieve the purpose of improving the effluent standard of nitrogen and phosphorus.
Description
Technical Field
The process relates to the field of municipal domestic sewage treatment or sewage treatment with requirements on nitrogen and phosphorus removal discharge, in particular to a process for improving the discharge standard of nitrogen and phosphorus in secondary biochemical effluent of municipal domestic sewage.
Background
At present, in China, under the strong requirement of national policy, municipal domestic sewage treatment rate in the district is obviously improved in various places, municipal sewage treatment facilities matched in various places are basically matched in place, and matching of public institutions such as cities and towns, hospitals and the like and rural domestic sewage treatment facilities is more complete.
Although the treatment rate of the domestic sewage is obviously improved, water pollution conditions such as water bloom, excessive growth of algae and the like of a receiving water body discharged by the domestic sewage treatment water still appear in various places undeniably, the environment is influenced, and the life experience of people is reduced.
In view of the pollution of the water body for receiving the domestic sewage treatment water, call for improving the discharge standard of the domestic sewage treatment appears in various places, for example, the discharge standard of a domestic sewage treatment station in the urban area of Beijing partially requires to reach the requirements of surface IV or V in the quality standard of surface water GB 3838-2002.
In the specific practical work of the work, COD, SS, BOD and the like in the discharge indexes of the domestic sewage treatment station can easily meet the requirements through biochemical processes and processes such as coagulation, precipitation, filtration and the like, but ammonia nitrogen, total nitrogen and total phosphorus can hardly meet the requirements of discharge standards, so that the work is a difficult point and a key point which troubles engineers.
The invention meets the high standard requirement of nitrogen and phosphorus removal in domestic sewage treatment by analyzing the water quality condition and flexibly adding the medicament.
Disclosure of Invention
The oxidant is chlorine, but not only chlorine; the dephosphorizing agent is aluminum chloride, but not only aluminum chloride. The oxidant of the invention is chlorine as an example, and the phosphorus removal agent is aluminum chloride as an example.
The invention adopts a process of an oxidant adding tank (1), a phosphorus removing agent adding tank (2), a separation reaction tank (3) and a water outlet tank (4).
The sewage related by the invention is the discharged water of domestic sewage after secondary biochemical treatment, wherein NH is contained in the water quality index 3 N is more than or equal to 2.0mg/L, total nitrogen is more than or equal to 2.0mg/L, TP is more than or equal to 0.4mg/L, and the discharge requirements of surface IV type or surface V type in surface water quality standard GB3838-2002 are not met.
The invention relates to an oxidant adding tank (1) for receiving effluent of secondary biochemical treatment to be treated, wherein a mechanical stirring device is arranged in the oxidant adding tank (1), and the stirring power is 8w/m 3 HRT =15min, and simultaneously adding an oxidant chlorine into the mixed solution, wherein the adding amount is 4 x ammonia nitrogen concentration +15mg/L; chlorine is dissolved in water to generate hypochlorous acid, and the hypochlorous acid oxidizes organic matters in the effluent water of the secondary biochemical treatment and reduces the COD value of the water; then, the ammonia reacts with ammonia in water to achieve the purpose of reducing the concentration of ammonia nitrogen in water; and alsoAs the phosphorus in the effluent water after the secondary biochemical treatment exists in the form of inorganic phosphate and organic compounds respectively, the organic matters in the effluent water are oxidized and the phosphorus in the organic matters is oxidized and exists in the form of phosphate in the water by adding the chlorine oxidant.
The phosphorus removing agent adding pool (2) receives the effluent of the oxidant adding pool (1), a mechanical stirring device is arranged in the phosphorus removing agent adding pool (2), and the stirring power is 8w/m 3 Wherein HRT =15min, the chlorine oxidant, the organic matters and the ammonia nitrogen which are added in the oxidant adding tank (1) can continue to react in the phosphorus removing agent adding tank (2) so as to obtain better treatment effect; and simultaneously, adding an aluminum chloride phosphorus removing agent into the phosphorus removing agent adding tank (2), wherein the adding amount of the aluminum chloride phosphorus removing agent is 3 multiplied by the total phosphorus concentration, and the aluminum chloride phosphorus removing agent is combined with phosphate radicals in the phosphorus removing agent adding tank (2) to generate aluminum phosphate salt which is insoluble in water.
The separation reaction tank (3) of the invention receives the effluent of the phosphorus removing agent adding tank (2), an inclined plate device is arranged in the separation reaction tank (3), and the effluent load is 25m 3 /(m 2 H), wherein the HRT =25min, a sludge discharge hopper is arranged at the bottom of the tank, the chlorine oxidant, the organic matters and the ammonia nitrogen in the water can continuously react in the separation reaction tank (3), and the reaction can be thorough so as to obtain better treatment effect; meanwhile, aluminum chloride phosphorus removing agent added in the phosphorus removing agent adding tank (2) and aluminum phosphate salt generated by phosphate radical in the phosphorus removing agent adding tank (2) fully react in the separation reaction tank (3) and are separated, and phosphorus is separated from the water treatment system, so that the purpose of reducing total phosphorus is achieved.
The water outlet tank (4) of the invention receives the outlet water of the separation reaction tank (3), and the water quality detection is carried out in the water outlet tank (4).
Drawings
FIG. 1 is a flow chart of a process for improving the discharge standard of nitrogen and phosphorus in secondary biochemical effluent of municipal domestic sewage.
Claims (5)
1. A sewage treatment method adopts the technology of an oxidant adding tank (1), a phosphorus removing agent adding tank (2), a separation reaction tank (3) and a water outlet tank (4),
the treated sewage is domestic sewage which is subjected to secondary biochemical treatmentIn which NH is an index of water quality 3 N, total nitrogen and TP do not meet the emission requirements.
2. The method of claim 1 wherein the oxidizing agent is chlorine gas, but not exclusively chlorine gas; the dephosphorizing agent is aluminum chloride, but not only aluminum chloride.
3. The adding amount of the oxidant added into the oxidant adding pool (1) of claim 1 is 4 multiplied by ammonia nitrogen concentration +15mg/L, a stirring device is arranged in the pool, and the unit stirring power is 8w/m 3 And the retention time of the pond water is 10-20min.
4. The phosphorus removing agent adding pool (2) of claim 1, wherein the adding amount of the phosphorus removing agent added is 3 x the total phosphorus concentration, a stirring device is arranged in the pool, and the unit stirring power is 8w/m 3 And the retention time of the pond water is 10-20min.
5. The separation reaction tank (3) according to claim 1, wherein an inclined plate sedimentation device is arranged in the tank, the retention time of the tank water is 20-30min, and a sludge discharge device is arranged at the bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110682308.9A CN115490352A (en) | 2021-06-20 | 2021-06-20 | Process for improving discharge standard of nitrogen and phosphorus in secondary biochemical effluent of municipal domestic sewage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110682308.9A CN115490352A (en) | 2021-06-20 | 2021-06-20 | Process for improving discharge standard of nitrogen and phosphorus in secondary biochemical effluent of municipal domestic sewage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115490352A true CN115490352A (en) | 2022-12-20 |
Family
ID=84464816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110682308.9A Pending CN115490352A (en) | 2021-06-20 | 2021-06-20 | Process for improving discharge standard of nitrogen and phosphorus in secondary biochemical effluent of municipal domestic sewage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115490352A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1715217A (en) * | 2004-07-02 | 2006-01-04 | 桂林工学院 | Process for removing nitrogen and phosphor from sewage capable of being built by separate periods |
| CN102126799A (en) * | 2011-01-17 | 2011-07-20 | 无锡德宝水务投资有限公司 | Method for treating fluorine-containing and ammonia nitrogen-containing waste water in electronic industry |
| CN102616993A (en) * | 2012-03-30 | 2012-08-01 | 南京大学连云港高新技术研究院 | Residual sludge zero discharge denitrification and phosphorous removal process and device |
| CN102826723A (en) * | 2012-09-20 | 2012-12-19 | 江苏艾特克环境工程有限公司 | Treatment method for urban sanitary sewage |
| CN105776758A (en) * | 2016-04-20 | 2016-07-20 | 安徽国祯环保节能科技股份有限公司 | Improved SBR wastewater treatment process for obtaining standard IV-class surface water |
| CN105776542A (en) * | 2016-04-20 | 2016-07-20 | 安徽国祯环保节能科技股份有限公司 | Improved AAO wastewater treatment process for obtaining standard IV-class surface water |
| CN107963709A (en) * | 2017-12-21 | 2018-04-27 | 上海万狮环保科技有限公司 | A kind of high-efficiency sewage dephosphorization agent and its application in municipal wastewater advanced treating |
| CN108083582A (en) * | 2017-12-29 | 2018-05-29 | 天津膜天膜科技股份有限公司 | Small-sized sewage treating system and sewage treatment process |
| CN108218118A (en) * | 2018-01-08 | 2018-06-29 | 浙江利欧环境科技有限公司 | A kind of city domestic sewage MBBR+MBR biological carbon and phosphorous removals device and denitrification and dephosphorization method |
| CN110642460A (en) * | 2019-09-19 | 2020-01-03 | 济南大学 | Method for removing nitrogen and phosphorus by ferrate enhanced denitrification phosphorus removal biological filter |
| CN111217477A (en) * | 2019-12-27 | 2020-06-02 | 安道麦股份有限公司 | Method for treating wastewater from phosphorus trichloride production |
| CN111453887A (en) * | 2020-05-12 | 2020-07-28 | 深圳市世清环保科技有限公司 | Phosphorus removal device and phosphorus removal method for high-concentration phosphorus-containing wastewater |
-
2021
- 2021-06-20 CN CN202110682308.9A patent/CN115490352A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1715217A (en) * | 2004-07-02 | 2006-01-04 | 桂林工学院 | Process for removing nitrogen and phosphor from sewage capable of being built by separate periods |
| CN102126799A (en) * | 2011-01-17 | 2011-07-20 | 无锡德宝水务投资有限公司 | Method for treating fluorine-containing and ammonia nitrogen-containing waste water in electronic industry |
| CN102616993A (en) * | 2012-03-30 | 2012-08-01 | 南京大学连云港高新技术研究院 | Residual sludge zero discharge denitrification and phosphorous removal process and device |
| CN102826723A (en) * | 2012-09-20 | 2012-12-19 | 江苏艾特克环境工程有限公司 | Treatment method for urban sanitary sewage |
| CN105776758A (en) * | 2016-04-20 | 2016-07-20 | 安徽国祯环保节能科技股份有限公司 | Improved SBR wastewater treatment process for obtaining standard IV-class surface water |
| CN105776542A (en) * | 2016-04-20 | 2016-07-20 | 安徽国祯环保节能科技股份有限公司 | Improved AAO wastewater treatment process for obtaining standard IV-class surface water |
| CN107963709A (en) * | 2017-12-21 | 2018-04-27 | 上海万狮环保科技有限公司 | A kind of high-efficiency sewage dephosphorization agent and its application in municipal wastewater advanced treating |
| CN108083582A (en) * | 2017-12-29 | 2018-05-29 | 天津膜天膜科技股份有限公司 | Small-sized sewage treating system and sewage treatment process |
| CN108218118A (en) * | 2018-01-08 | 2018-06-29 | 浙江利欧环境科技有限公司 | A kind of city domestic sewage MBBR+MBR biological carbon and phosphorous removals device and denitrification and dephosphorization method |
| CN110642460A (en) * | 2019-09-19 | 2020-01-03 | 济南大学 | Method for removing nitrogen and phosphorus by ferrate enhanced denitrification phosphorus removal biological filter |
| CN111217477A (en) * | 2019-12-27 | 2020-06-02 | 安道麦股份有限公司 | Method for treating wastewater from phosphorus trichloride production |
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