CN109626739A - A kind of Denitrification of Coking Wastewater method - Google Patents
A kind of Denitrification of Coking Wastewater method Download PDFInfo
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- CN109626739A CN109626739A CN201811650523.5A CN201811650523A CN109626739A CN 109626739 A CN109626739 A CN 109626739A CN 201811650523 A CN201811650523 A CN 201811650523A CN 109626739 A CN109626739 A CN 109626739A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/166—Nitrites
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
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- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The present invention provides a kind of Denitrification of Coking Wastewater methods, the steps include: that coagulant and demulsifier are added in coking wastewater, remove the sulfide and mineral oil in coking wastewater, then coking wastewater is successively passed into short distance nitration pond, anaerobic ammonium oxidation tank, aerobic decarburization pond carries out nitration reaction, denitrogenation processing, decarburization, treated coking wastewater is separated into supernatant and sludge by sedimentation in secondary sedimentation tank, sludge reflux is to short distance nitration pond, supernatant is passed into coagulative precipitation tank precipitating again, flocculant is added, remove the suspended matter in mixed liquor, coking wastewater after finally obtaining denitrogenation, obtained excess sludge is precipitated to be discharged from the outlet of coagulating sedimentation bottom of pond portion；The present invention use short-cut nitrification-denitrification process coking wastewater method, can effectively shorten the reaction mechanism mechanism of reaction, reduce carbon source consumption, reduce power consumption, reduce operating cost.
Description
Technical field
The present invention relates to environment protection field, specifically a kind of Denitrification of Coking Wastewater method.
Background technique
Coking wastewater complicated composition, water is big, and environmental pollution is serious.It removes in water containing ammonia nitrogen, sulfide, cyanide etc.
Inorganic chemical beyond the region of objective existence, also containing the monocycles such as phenol, naphthalene, pyridine, quinoline or polycyclc aromatic compound and nitrogenous, sulphur, oxygen it is miscellaneous
Ring organic pollutant is one of most intractable industrial wastewater.
Currently, domestic and foreign countries are mainly A/O or A for the traditional technology of Treatment of Coking Effluent2/ O technique, Nitrogen Removal Mechanism
For complete nitrification and denitrification.The technology is the biochemical action by bacterium, by the ammonia nitrogen in sewage through nitrification and denitrification denitrogenation
Process makes the mineralized nitrogen nitrogen in sewage and the method that removes from water body.Nitration reaction is in aerobic environment, by good
Oxygen autotroph is completed, and is carried out in two steps, and it is nitrite nitrogen that the first step, which is nitrite bacteria by ammonium oxidation, and second step is
Nitrite nitrogen is further oxidized to nitrate nitrogen by nitrobacteria.Its key reaction is as follows:
NH4 ++2HCO3 -+3/2O2→NO2 -+H2O+2H2CO3
NO2 -+1/2O2→NO3 -
Anti-nitration reaction is under anoxic conditions, by different oxygen type bacterium using the oxygen in NO3-N and NO2-N as electricity
Nitrate nitrogen and nitrite nitrogen are reduced into nitrogen and escaped from water body, together by sub- receptor using organic matter as electron donor
When the partial organic substances in sewage are oxidized to CO2And H2O.Its key reaction process is as follows:
NO2 -+ 3H (hydrogen donor-organic matter) → 1/2N2+H2O+OH-
NO3 -+ 5H (hydrogen donor-organic matter) → 1/2N2+2H2O+OH-
A/O technique and A2/ O technique plays the role of Treatment of Coking Effluent within one period preferable, reduces useless
The discharge of water pollutant.But with the continuous improvement of environmental requirement in recent years, based on traditional complete nitrification and denitrification theory base
The coking waste water treatment process established on plinth cannot be guaranteed the stably reaching standard of COD (COD) and ammonia nitrogen.In engineering operation
In, there is also following items drawbacks for above-mentioned technique:
(1) denitrification percent is limited by mixed liquid recycle ratio, raw water carbon-nitrogen ratio, and large scale nitrification liquid is needed to be back to denitrification
Pond, to cause power consumption larger, operating cost is higher；
(2) process flow is longer, and structures are larger, and construction investment is higher, and occupied area is larger；
(3) since coked waste water carbon-nitrogen ratio is low, outside is needed to add carbon source to maintain anti-nitration reaction.
Summary of the invention
Power consumption present in current coking waste-water denitrification is big, operating cost is high, technique in order to solve by the present invention
Long flow path, investment is high, needs the problem of adding carbon source, provides a kind of short-cut nitrification-denitrification process coking wastewater
Method, can effectively shorten the reaction mechanism mechanism of reaction, reduce carbon source consumption, reduce power consumption, reduce operating cost.
A kind of Denitrification of Coking Wastewater method, comprising the following steps:
(1) coagulant and demulsifier are added in coking wastewater, removes sulfide and mineral oil in coking wastewater；
(2) coking wastewater is then passed into short distance nitration pond progress nitration reaction to go under the action of aerobic microbiological
It controls except most of organic matter, while by nitration reaction in Nitrification Stage；
(3) coking wastewater after nitration reaction is passed through anaerobic ammonium oxidation tank, denitrogenation processing is carried out to coking wastewater；
(4) coking wastewater after denitrogenation is passed through aerobic decarburization pond and carries out decarburization, further remove having in coking wastewater
Machine pollutant；
(5) by the coking wastewater after decarburization by precipitating to secondary settling tank, burnt waste water is separated into supernatant and sludge,
Sludge reflux is to short distance nitration pond；
(6) supernatant is passed into coagulative precipitation tank precipitating, flocculant is added, removed the suspended matter in mixed liquor, obtain
Coking wastewater after denitrogenation, the excess sludge precipitated are discharged from the outlet of coagulating sedimentation bottom of pond portion.
Specifically, coking wastewater maintains the dissolved oxygen of Nitrification Stage in 0.8-1.0mg/L in short distance nitration pond, and
By the control to conditions such as temperature, sludge age, hydraulic detention times, mineralized nitrogen rate is 40% or so, shortcut nitrification
Rate is more than 70%, realizes the accumulation of nitrite nitrogen, while the removal rate of COD is 70% or more.
Specifically, it is substantially carried out Anammox denitrification reaction in anaerobic ammonium oxidation tank, exists simultaneously minimal amount of anti-nitre
Change denitrification reaction, denitrification percent is higher, and nitrite nitrogen is substantially removed, and nitrogen pollutant is predominantly in the form of ammonia in water
The removal rate of nitrogen, COD is not high, but anaerobic acidification hydrolysis can improve the biodegradability of sewage.
Specifically, by short distance nitration pond, anaerobic ammonium oxidation tank, aerobic three biochemical units in decarburization pond continuous processing,
Biochemical reaction system water outlet CODcr (bichromate index) can be down to 90-100mg/L, and denitrification process does not consume carbon source, denitrification percent
It greatly improves, can reach 75%-80%.
Specifically, flocculant M180, ferric sulfate, aluminum sulfate, polysilicon acid, poly-silicic acid iron sulfate, poly- phosphorus iron chloride, poly- phosphorus
One of aluminium chloride, ferric-polysilicate, polyacrylamide, methacrylic acid.
Specifically, coagulant M180, ferric sulfate, aluminum sulfate, polysilicon acid, poly-silicic acid iron sulfate, poly- phosphorus iron chloride, poly- phosphorus
One of aluminium chloride, ferric-polysilicate, polyacrylamide, methacrylic acid.
Specifically, demulsifier is polyoxyethylene polyoxypropylene octadecyl alcolol ether, polyoxyethylene polyoxypropylene polyethers, aluminium chloride
One of PAC.
Compared with traditional complete nitrification-denitrification biological decarbonization denitrogenation method, the invention has the characteristics that:
1) it is not necessarily to additional carbon in denitrification process, reduces operating cost；
2) nitrifying process control flows back without nitrification liquid in Nitrification Stage, saves power consumption cost, reduce two
Heavy pond, coagulative precipitation tank volume, reduce occupied area；
3) short distance nitration process reduces the production acid amount in nitrification, reduces and throws alkali number, reduces oxygen consumption and power disappears
Consumption, because only need to be nitrite nitrogen by the ammonium oxidation of half in short distance nitration using ammonia nitrogen as electron donor,
60%-70% oxygen demand and 50%-60% alkali consumption are saved than complete nitrification；
4) in anaerobic ammonium oxidation process, since ammonia nitrogen can be not required to outer directly as the electron donor of denitrification reaction
Portion adds organic carbon source as electron donor, produces alkali number and is reduced to zero, saves medicament expense；
5) biochemical system each unit uses biological contact oxidation process, and the surplus sludge volume that sewage disposal system generates is remote low
In traditional nitrifying process, the 1/4-1/3 of about traditional nitrifying process；
6) Anammox denitrification process is not limited by organic carbon source in waste water, and denitrification percent greatly improves, total nitrogen removal efficiency
It can reach 75%-80%, improve 30%-40% than traditional handicraft；
7) decarbonizing process is enhanced, it is the depth of a step coking wastewater that biochemical system water outlet CODcr, which can be down to 90-100mg/L,
Degree processing reduces processing load.
Specific embodiment
For a further understanding of the present invention, the preferred embodiment of the invention is described below with reference to embodiment, still
It should be appreciated that these descriptions are only further explanation the features and advantages of the present invention, rather than to the claims in the present invention
Limitation.
Coking wastewater is derived from certain large-scale coke-oven plant, and water quality is shown in Table 1, the pH of waste water is adjusted by addition sulfuric acid and phosphoric acid
Value adds P elements according to C:N:P=200:50:1 to adjust the trophic component of waste water, and seed sludge is derived from coking wastewater biochemistry
The aeration tank of processing system, quiet heavy 30min is to remove the sludge and suspended impurity of settling property difference.
Controlled at (35 ± 1) DEG C, dissolved oxygen 2.0-3.0mg/L, the aerobic continuous flow biofilm reactor of level-one exists
Short distance nitration is realized while removing most of organic matter.When ammonia nitrogen volumetric loading is 0.13-0.22g NH4 +-N/(L·d)
When, continuous flow reactor is able to achieve short distance nitration and effectively removes ammonia nitrogen.
Under conditions of temperature is 34 DEG C, pH value 7.5-8.5, biochemical stop total duration are 33h, successfully opened by 115d
Anaerobic ammonia oxidation reactor is moved.When influent ammonia nitrogen, nitrite nitrogen concentration are respectively that 80mg/L and 90mg/L, total nitrogen load are
When 160mg/ (Ld), 86% and 98% are respectively reached to the removal rate highest of ammonia nitrogen and nitrite nitrogen, nitrogen removal rate reaches
To 75%.Meanwhile NO2 -- N concentration has inhibiting effect to anaerobic ammonia oxidizing bacteria, to NO2 -The maximum tolerance range of-N is 87.5-
110mg/L。
Later, waste water realizes the complete nitrification of ammonia nitrogen in second level aerobic reactor, further eliminates in waste water and remains
Ammonia nitrogen, nitrite nitrogen and organic pollutant.
The present embodiment can effectively remove ammonia nitrogen and organic pollutant in coking wastewater, and when normal operation is discharged ammonia nitrogen <
15mg/L, nitrite nitrogen < 1.0mg/L, COD are down to 124-186mg/L；Effluent quality is better than A/O, A2/ O biological denitrificaion work
The effluent quality of skill.
1 coking wastewater water-quality constituents of table
Claims (5)
1. a kind of Denitrification of Coking Wastewater method, comprising the following steps:
(1) coagulant and demulsifier are added in coking wastewater, removes sulfide and mineral oil in coking wastewater；
(2) coking wastewater is then passed into short distance nitration pond and carries out nitration reaction, under the action of aerobic microbiological, removal is big
Partial organic substances, while nitration reaction being controlled in Nitrification Stage；
(3) coking wastewater after nitration reaction is passed through anaerobic ammonium oxidation tank, denitrogenation processing is carried out to coking wastewater；
(4) coking wastewater after denitrogenation is passed through aerobic decarburization pond and carries out decarburization, further remove organic dirt in coking wastewater
Contaminate object；
(5) by the coking wastewater after decarburization by precipitating to secondary settling tank, burnt waste water is separated into supernatant and sludge, sludge
Flow back into short distance nitration pond；
(6) supernatant is passed into coagulative precipitation tank precipitating, flocculant is added, removed the suspended matter in mixed liquor, obtain denitrogenation
Coking wastewater afterwards, the excess sludge precipitated are discharged from the outlet of coagulating sedimentation bottom of pond portion.
2. a kind of Denitrification of Coking Wastewater method according to claim 1, which is characterized in that in anaerobic ammonium oxidation tank mainly into
Row Anammox denitrification reaction exists simultaneously minimal amount of denitrification denitrogenation reaction, and denitrification percent is higher, and nitrite nitrogen is basic
It is removed, nitrogen pollutant is predominantly in the form of ammonia nitrogen in water, and the removal rate of COD is not high, but anaerobic acidification hydrolysis
The biodegradability of sewage can be improved.
3. a kind of Denitrification of Coking Wastewater method according to claim 1, which is characterized in that the flocculant is M180, sulphur
Sour iron, aluminum sulfate, polysilicon acid, poly-silicic acid iron sulfate, poly- phosphorus iron chloride, poly- phosphorus aluminium chloride, ferric-polysilicate, polyacrylamide, first
One of base acrylic acid.
4. a kind of Denitrification of Coking Wastewater method according to claim 1, which is characterized in that the coagulant is M180, sulphur
Sour iron, aluminum sulfate, polysilicon acid, poly-silicic acid iron sulfate, poly- phosphorus iron chloride, poly- phosphorus aluminium chloride, ferric-polysilicate, polyacrylamide, first
One of base acrylic acid.
5. a kind of Denitrification of Coking Wastewater method according to claim 1, which is characterized in that the demulsifier is polyoxyethylene
One of polyoxypropylene octadecyl alcolol ether, polyoxyethylene polyoxypropylene polyethers, aluminium chloride PAC.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111533353A (en) * | 2020-05-07 | 2020-08-14 | 山东济炼石化工程有限公司 | Delayed coking device sewage treatment method |
| CN111807610A (en) * | 2020-06-19 | 2020-10-23 | 绿源(北京)环保设备股份有限公司 | Method and system for deeply removing total nitrogen in sewage |
| CN112408722A (en) * | 2020-12-04 | 2021-02-26 | 江西省华赣环境集团有限公司 | Anaerobic ammonia oxidation denitrification treatment process for rare earth tail water |
| CN114014497A (en) * | 2021-11-05 | 2022-02-08 | 山东中移能节能环保科技股份有限公司 | Coking wastewater treatment process |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1778725A (en) * | 2005-10-14 | 2006-05-31 | 单明军 | Energy-saving coking waste-water denitrification |
-
2018
- 2018-12-31 CN CN201811650523.5A patent/CN109626739A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1778725A (en) * | 2005-10-14 | 2006-05-31 | 单明军 | Energy-saving coking waste-water denitrification |
Non-Patent Citations (1)
| Title |
|---|
| 于勇等: "《钢铁工业绿色工艺技术》", 31 January 2017, 冶金工业出版社 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111533353A (en) * | 2020-05-07 | 2020-08-14 | 山东济炼石化工程有限公司 | Delayed coking device sewage treatment method |
| CN111807610A (en) * | 2020-06-19 | 2020-10-23 | 绿源(北京)环保设备股份有限公司 | Method and system for deeply removing total nitrogen in sewage |
| CN111807610B (en) * | 2020-06-19 | 2021-03-30 | 绿源(北京)环保设备股份有限公司 | Method and system for deeply removing total nitrogen in sewage |
| CN112408722A (en) * | 2020-12-04 | 2021-02-26 | 江西省华赣环境集团有限公司 | Anaerobic ammonia oxidation denitrification treatment process for rare earth tail water |
| CN114014497A (en) * | 2021-11-05 | 2022-02-08 | 山东中移能节能环保科技股份有限公司 | Coking wastewater treatment process |
| CN114014497B (en) * | 2021-11-05 | 2022-06-17 | 山东中移能节能环保科技股份有限公司 | Coking wastewater treatment process |
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Application publication date: 20190416 |