CN112744978A - Treatment method of petrochemical mixed discharged sewage - Google Patents
Treatment method of petrochemical mixed discharged sewage Download PDFInfo
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- CN112744978A CN112744978A CN201911051803.9A CN201911051803A CN112744978A CN 112744978 A CN112744978 A CN 112744978A CN 201911051803 A CN201911051803 A CN 201911051803A CN 112744978 A CN112744978 A CN 112744978A
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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
- C02F2101/30—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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
Abstract
The invention discloses a method for treating petrochemical mixed discharged sewage. The method comprises the following steps: the mixed effluent of petrochemical industry gets into sewage lift pit, then carries to sedimentation tank and multistage combination biomembrane denitrogenation unit and deposits and handle, and multistage combination biomembrane denitrogenation unit needs plus carbon source, and the backwash waste water that multistage combination biomembrane denitrogenation unit bottom came out returns the sedimentation tank lower part, and the play water of multistage combination biomembrane denitrogenation unit gets into the control pond, and the control is qualified after discharges. The method can realize the standard discharge of total nitrogen and total phosphorus of petrochemical mixed discharged sewage, and simultaneously reduce the investment and the operating cost of the petrochemical mixed discharged sewage.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a treatment method for standard discharge of petrochemical mixed discharged sewage.
Background
With the development of economy in China, the social attention is more and more aroused by water pollution and water resource shortage, and the development of enterprises is severely restricted by the more strict sewage discharge standard and drainage index of China if no measures are taken. Water conservation, emission reduction and standard treatment become necessary conditions promised by most enterprises, particularly new enterprises, and especially several power enterprises, petrochemical enterprises and state resource committees sign responsibility. Petrochemical industry plays an important role in national economy and is a large household for industrial water in China, but petrochemical enterprises have high sewage treatment difficulty and high public attention, public opinion is more and more aroused, and higher requirements are put forward for the petrochemical enterprises. Therefore, the total amount of water taking and sewage discharge of China petrochemical enterprises is greatly reduced, the problems of water resource shortage and environmental protection capacity restriction in the China petrochemical development process can be effectively solved, and better economic benefits and remarkable social benefits and environmental benefits can be created for the enterprises.
As the water pollution in China is aggravated, more strict sewage discharge standards are established in China and places, law enforcement is increased, the law enforcement in sensitive areas is more comprehensive and strict, meanwhile, the supervision of public opinion makes petrochemical enterprises face challenges, with the release and implementation of national standard GB31570 one 2015 emission Standard for pollutants for oil refining industry, special pollutant factors are required besides ammonia nitrogen, total phosphorus and Chemical Oxygen Demand (COD) indexes, and the standard discharge of discharged sewage faces increasingly serious challenges.
The sewage treatment plants of petrochemical enterprises (coal-containing chemical enterprises) all have sewage discharge, and the sewage of the petrochemical enterprises has higher concentrations of ammonia nitrogen and total phosphorus in the sewage due to the characteristics of the processing process and the characteristics of fossil raw materials, and the traditional process technology of the existing sewage treatment plants is not enough to realize the standard treatment of the total nitrogen and the total phosphorus. Therefore, the technology suitable for standard treatment of total nitrogen and total phosphorus in petrochemical wastewater is developed, design parameters are optimized, and a complete set of technology is formed, and is extremely important for the survival development of petrochemical enterprises.
After GB31570-2015 discharge Standard for Industrial pollutants for Petroleum refining is implemented in 7/1/2017, the total nitrogen index of the discharged sewage of petrochemical enterprises is less than 15mg/L, the total phosphorus index is less than 0.5mg/L, and the Chemical Oxygen Demand (COD) index is less than 50 mg/L. After the new standard is released, the discharged sewage fully reaches the standard and is scheduled. The removal of ammonia nitrogen, total phosphorus and total nitrogen in the petrochemical wastewater treatment consumes larger investment and operation energy consumption, and the advanced treatment and standard discharge of the discharged wastewater in a wastewater treatment plant are realized by optimizing, developing and combining related technologies of process technology. The development and application of the technology can not only realize the standard reaching of total nitrogen and total phosphorus of the discharged sewage, but also optimize the operation mode and design parameters, reduce investment and operation cost, and have wide significance for the standard reaching treatment of the discharged sewage in petrochemical enterprises including coal chemical enterprises.
Disclosure of Invention
The invention aims to provide a treatment method of petrochemical mixed discharged sewage, which aims to realize standard discharge of total nitrogen and total phosphorus in the petrochemical mixed discharged sewage and reduce investment and operation cost of the petrochemical mixed discharged sewage.
The invention provides a method for treating petrochemical mixed discharged sewage, which is characterized by comprising the following steps:
1) sending the petrochemical mixed discharged sewage into a sewage lifting tank, then conveying the sewage to a sedimentation tank for sedimentation, preferably conveying the sewage to a high-density sedimentation tank by a sewage lifting pump, and removing suspended matters and Total Phosphorus (TP) in the sewage;
2) after the sewage is precipitated in the sedimentation tank, the residual sludge in the sedimentation tank is discharged into a sludge treatment system, the effluent of the sedimentation tank enters a multi-section combined biological membrane denitrification unit, and the main function of the multi-section combined biological membrane denitrification unitNitrite Nitrogen (NO) in sewage2-N), nitrate Nitrogen (NO)3-N) reduction to nitrogen (N)2) And the total nitrogen in the sewage is removed, the multi-section combined biological membrane denitrification unit needs an external carbon source, backwashing wastewater discharged from the bottom of the multi-section combined biological membrane denitrification unit returns to the lower part of the sedimentation tank, and the effluent of the multi-section combined biological membrane denitrification unit enters a monitoring tank and is discharged after the monitoring is qualified.
The invention provides a second method for treating petrochemical mixed discharged sewage, which is characterized by comprising the following steps:
1) the petrochemical industry mixed discharged sewage enters a sewage lifting tank and is then conveyed to a multi-section combined biomembrane denitrification unit, preferably a sewage lifting pump, and the multi-section combined biomembrane denitrification unit mainly has the function of removing nitrite Nitrogen (NO) in the sewage2-N), nitrate Nitrogen (NO)3-N) reduction to nitrogen (N)2) In order to remove the total nitrogen in the sewage, the multi-section combined biological membrane denitrification unit needs an additional carbon source;
2) the play water of multistage combination biomembrane denitrogenation unit gets into the sedimentation tank, and the backwash waste water that multistage combination biomembrane denitrogenation unit bottom came out gets into the sedimentation tank lower part, and sewage deposits in the sedimentation tank, removes suspended solid and Total Phosphorus (TP) in the sewage, and sludge treatment system is discharged to the surplus mud of sedimentation tank bottom, and the play water of sedimentation tank gets into the control pond, and the control is qualified after discharges.
The sedimentation tank can be a high-density sedimentation tank or other sedimentation tanks, and the high-density sedimentation tank is preferred.
The multistage combined biological membrane denitrification unit is generally combined by 1-10 stages, and preferably combined by 1-4 stages.
The petrochemical mixed discharged sewage mainly comprises one or more of side ditch treatment system drainage, flue gas desulfurization drainage, high-concentration sewage treatment series drainage, high-ammonia nitrogen sewage treatment system drainage and the like. The petrochemical mixed discharged sewage can be sewage after pretreatment or sewage directly discharged.
The external carbon source can be one or more of organic matters which are convenient for microorganisms to absorb, such as methanol, ethanol, glucose, acetic acid, sodium acetate and the like, or primary sedimentation tank sludge.
The high-density sedimentation tank (Ds) is adopted for sedimentation, iron salt and Polyacrylamide (PAM) are added into the high-density sedimentation tank, and after mixing, flocculation and sedimentation, phosphorus in sewage is removed, so that the total phosphorus index reaches the standard, suspended matters in the sewage are effectively removed, and the reduction of treatment capacity caused by the fact that microorganisms cannot fully contact with pollutants due to the fact that excessive suspended matters are adhered to the surface of a biological membrane in a membrane bioreactor of a multi-section combined biological membrane denitrification unit is avoided, and the treatment effect of a reaction unit is influenced.
The multi-section combined biological membrane denitrification unit has the action mechanism that a reaction system is divided into relatively independent biological membrane reaction sections, an aerator is arranged in the reaction section, the reaction conditions in a certain reaction section of the multi-section combined biological membrane denitrification unit (nAO) are set according to water quality, an A-type anoxic reactor aims at removing total nitrogen, and a carbon source is added into the reactor by adopting a denitrification method; the O-shaped aerobic reactor aims at removing organic pollutants, adopts an aerobic oxidation method and adopts an air blower to oxygenate the reactor.
The multi-section combined biological membrane denitrification unit adopts light polymer biological filler to realize the multi-stage series connection of reactors, flexibly realizes facultative and aerobic environments by adjusting the aeration amount of each stage of reactor, inoculates denitrifying bacteria in the facultative reactor, inoculates nitrobacteria and removes organic heterotrophic bacteria in the aerobic reactor, thereby realizing the simultaneous removal of Chemical Oxygen Demand (COD), ammonia nitrogen and total nitrogen in the same system and achieving the purpose of purifying sewage.
Compared with the prior art, the petrochemical mixed discharged sewage treatment method has the beneficial effects that:
1. the method has wide treatment range, can treat single sewage and mixed sewage, and the sewage can be pretreated sewage or directly discharged sewage.
2. The method adopts the high-density sedimentation tank technology and the chemical phosphorus removal technology to be matched, so that the total phosphorus can be removed while the suspended matters in the sewage are reduced. The high-density sedimentation tank can be replaced by other sedimentation tanks and flexibly combined.
3. The method adopts nAO multistage combined biomembrane denitrification technology, can flexibly regulate and control Dissolved Oxygen (DO) by adjusting the aeration quantity of each stage of reactor in each tank body during operation, thereby flexibly realizing aerobic and anoxic environments among each stage of reactor, having the functions of synchronous nitrification and denitrification and achieving the purpose of simultaneously removing Chemical Oxygen Demand (COD), ammonia nitrogen and total nitrogen.
4. The method of the invention has more flexible operation, and the nAO multi-section combined biomembrane denitrification technology can be flexibly combined and flexibly operated according to the water quality requirement.
5. The method has the advantages of high organic matter volume load, large hydraulic load and short hydraulic retention time.
6. The method has the advantages of strong impact load resistance, no sludge bulking problem, less microorganism loss and stable treatment effect.
7. The method of the invention can be operated discontinuously, and because a large amount of microorganisms grow in the rough and porous interior and surface of the granular filler, the microorganisms cannot be lost, and the strains can be maintained even if the granular filler is not operated for a long time.
8. The method of the invention can simplify the treatment process on the premise of ensuring the treatment effect, and has the advantages of small occupied area, less investment and low operation cost.
9. The method can realize the comprehensive standard reaching of the discharged sewage of the petrochemical enterprises, and has good prospect in the standard reaching discharge treatment process of the mixed discharged sewage of the petrochemical enterprises.
The invention is described in further detail below with reference to the figures and the detailed description, without limiting the scope of the invention.
Drawings
FIG. 1 is a simple schematic diagram of a petrochemical mixed effluent treatment method of the invention.
FIG. 2 is a simple schematic diagram of a second petrochemical mixed effluent treatment method of the present invention.
Detailed Description
As shown in fig. 1, a method for treating petrochemical mixed effluent, the process flow is described as follows:
1) the petrochemical mixed discharged sewage enters a sewage lifting tank 5, and is conveyed to a sedimentation tank 8 for sedimentation, preferably conveyed to a high-density sedimentation tank by a sewage lifting pump, which is not shown in the figure 1, so as to remove suspended matters and Total Phosphorus (TP) in the sewage;
2) after the sewage is precipitated in the sedimentation tank 8, the residual sludge 13 in the sedimentation tank 8 is discharged into a sludge treatment system 14, the effluent of the sedimentation tank 8 enters a multi-section combined biological membrane denitrification unit 10, and the main function of the multi-section combined biological membrane denitrification unit 10 is to remove nitrite Nitrogen (NO) in the sewage2-N), nitrate Nitrogen (NO)3-N) reduction to nitrogen (N)2) And in order to remove the total nitrogen in the sewage, the multi-section combined biological membrane denitrification unit 10 needs an external carbon source 9, backwashing wastewater 15 coming out from the bottom of the multi-section combined biological membrane denitrification unit 10 returns to the lower part of the sedimentation tank 8, effluent of the multi-section combined biological membrane denitrification unit 10 enters a monitoring tank 11, and qualified sewage 12 after the monitoring is qualified is discharged.
As shown in fig. 2, a second method for treating petrochemical mixed effluent, the process flow is described as follows:
1) the petrochemical mixed effluent enters a sewage lifting tank 5 and is then conveyed to a multi-section combined biomembrane denitrification unit 10, preferably a sewage lifting pump to the multi-section combined biomembrane denitrification unit 10, not shown in figure 2, and the main function of the multi-section combined biomembrane denitrification unit 10 is to remove nitrite Nitrogen (NO) in the sewage2-N), nitrate Nitrogen (NO)3-N) reduction to nitrogen (N)2) In order to remove the total nitrogen in the sewage, the multi-section combined biological membrane denitrification unit needs an additional carbon source;
2) effluent of the multi-section combined biological membrane denitrification unit 10 enters a sedimentation tank 8, backwash wastewater 15 coming out of the bottom of the multi-section combined biological membrane denitrification unit 10 enters the lower part of the sedimentation tank 8, sewage is precipitated in the sedimentation tank 8, suspended matters and Total Phosphorus (TP) in the sewage are removed, residual sludge 13 at the bottom of the sedimentation tank 8 is discharged into a sludge treatment system 14, effluent of the sedimentation tank 8 enters a monitoring tank 11, and qualified sewage 12 after being monitored is discharged.
The petrochemical mixed discharged sewage comprises side ditch treatment system drainage 1, flue gas desulfurization drainage 2, high-concentration sewage treatment series drainage 3 and high ammonia nitrogen sewage treatment system drainage 4, and all sewage is converged into a sewage lifting pool 5 through a collecting and conveying system.
In the two methods, ferric salt 6 and polyacrylamide 7 can be added into the sedimentation tank, floc adsorption is enhanced by using continuously circulating medium particles and various chemical agents, so that the sedimentation performance of suspended matters in water is improved, and in the sedimentation tank 8, the total phosphorus content in the sewage can be removed besides reducing the suspended matters in the sewage by adopting the cooperation of a sedimentation technology and a chemical phosphorus removal technology.
The reactors of the nA/O multi-section combined biomembrane denitrification unit 10 in the two methods are connected in series in multiple stages, facultative and aerobic environments are flexibly realized by adjusting the aeration amount of each stage of reactor, denitrifying bacteria are inoculated in the facultative reactor, nitrifying bacteria are inoculated in the aerobic reactor to remove organic heterotrophic bacteria, and the simultaneous removal of Chemical Oxygen Demand (COD), ammonia nitrogen and total nitrogen is realized in one biochemical pond. The multistage combined biological membrane denitrification unit is usually combined by 1-10 stages, and preferably combined by 1-4 stages. In order to ensure sufficient carbon source for denitrification, a carbon source 9 is added into the multi-section combined biomembrane denitrification unit pool, the added carbon source 9 can be organic matters which are convenient for microorganisms to absorb, such as methanol, ethanol, glucose, acetic acid, sodium acetate and the like, and the sludge in the primary sedimentation pool is also an option.
The sewage is treated by the sedimentation of the sedimentation tank 8, the total phosphorus in the effluent is qualified, the concentration of suspended matters meets the reaction conditions of the biomembrane reaction technology, and the stable and efficient operation of the system of the postposition multi-section combined biomembrane denitrification unit can be ensured.
The sedimentation tank 8 can be a high-density sedimentation tank or other sedimentation tanks, and preferably a high-density sedimentation tank. The effluent of the sedimentation tank 8 preferably flows automatically into the lower part of the denitrification biomembrane reactor of the multi-section combined biomembrane denitrification unit 10. The sewage is in a biofilm reactor, and the biofilm on the carrier is in a suspension state, is kept in full contact with dissolved oxygen and a medium in the sewage, and is fully transferred, so that the reaction efficiency is high, the surface of the biofilm is continuously updated, and the sewage treatment efficiency and the impact resistance of the reactor are greatly improved.
By using the method for treating the petrochemical mixed discharged sewage, the total nitrogen and the total phosphorus of the petrochemical mixed discharged sewage can be discharged up to the standard, and the investment and the operating cost of the petrochemical mixed discharged sewage are reduced.
Claims (10)
1. A treatment method of petrochemical industry mixed discharged sewage is characterized by comprising the following steps:
1) the petrochemical industry mixed discharged sewage enters a sewage lifting tank, then is conveyed to a sedimentation tank for sedimentation, and is preferably conveyed to a high-density sedimentation tank by a sewage lifting pump to remove suspended matters and total phosphorus in the sewage;
2) after sewage is precipitated in the sedimentation tank, the residual sludge in the sedimentation tank is discharged into the sludge treatment system, the effluent of the sedimentation tank enters the multi-section combined biological membrane denitrification unit to remove total nitrogen in the sewage, the multi-section combined biological membrane denitrification unit needs an external carbon source, the backwashing wastewater coming out from the bottom of the multi-section combined biological membrane denitrification unit returns to the lower part of the sedimentation tank, the effluent of the multi-section combined biological membrane denitrification unit enters the monitoring tank, and the monitoring is qualified and then is discharged.
2. A treatment method of petrochemical industry mixed discharged sewage is characterized by comprising the following steps:
1) the petrochemical industry mixed discharged sewage enters a sewage lifting pond and is conveyed to a multi-section combined biological membrane denitrification unit to remove total nitrogen in the sewage, and the multi-section combined biological membrane denitrification unit needs an external carbon source;
2) the effluent of multistage combination biomembrane denitrogenation unit gets into the sedimentation tank, and the backwash waste water that multistage combination biomembrane denitrogenation unit bottom came out gets into the sedimentation tank lower part, and sewage deposits in the sedimentation tank, removes suspended solid and total phosphorus in the sewage, and sludge treatment system is discharged to the surplus mud of sedimentation tank bottom, and the effluent of sedimentation tank gets into the control pond, and the control is qualified after discharges.
3. The method for treating petrochemical mixed discharged sewage according to claim 1 or 2, wherein the method comprises the following steps: the sedimentation tank is a high-density sedimentation tank or other sedimentation tanks.
4. The method for treating petrochemical mixed discharged sewage according to claim 3, wherein the method comprises the following steps: the sedimentation tank is a high-density sedimentation tank.
5. The method for treating petrochemical mixed discharged sewage according to claim 1 or 2, wherein the method comprises the following steps: the multi-section combined biological film denitrification unit is combined by 1-10 sections.
6. The method for treating petrochemical mixed discharged sewage according to claim 5, wherein the method comprises the following steps: the multi-section combined biological film denitrification unit is combined by 1-4 sections.
7. The method for treating petrochemical mixed discharged sewage according to claim 1 or 2, wherein the method comprises the following steps: the petrochemical mixed discharged sewage comprises one or more of side ditch treatment system drainage, flue gas desulfurization drainage, high-concentration sewage treatment series drainage and high ammonia nitrogen sewage treatment system drainage, and is pretreated sewage or directly discharged sewage.
8. The method for treating petrochemical mixed discharged sewage according to claim 1 or 2, wherein the method comprises the following steps: the external carbon source of the multi-section combined biological membrane denitrification unit is one or more of organic matters which are convenient for microorganisms to absorb, such as methanol, ethanol, glucose, acetic acid and sodium acetate, or primary sedimentation tank sludge.
9. The method for treating petrochemical mixed discharged sewage according to claim 1 or 2, wherein the method comprises the following steps: the method adopts the sedimentation tank for sedimentation, and is characterized in that iron salt and polyacrylamide are added into the high-density sedimentation tank, and after mixing, flocculation and sedimentation, phosphorus in the sewage is removed, so that the total phosphorus index reaches the standard, and suspended matters in the sewage are effectively removed.
10. The method for treating petrochemical mixed discharged sewage according to claim 1 or 2, wherein the method comprises the following steps: the multi-section combined biological membrane denitrification unit has the action mechanism that a reaction system is divided into relatively independent biological membrane reaction sections, an aerator is arranged in the reaction section, the reaction conditions in a certain reaction section of the multi-section combined biological membrane denitrification unit are set according to water quality, the A-type anoxic reactor aims to remove total nitrogen, and a carbon source is added into the reactor by adopting a denitrification method; the O-shaped aerobic reactor aims at removing organic pollutants, adopts an aerobic oxidation method and adopts an air blower to oxygenate the reactor.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101880109A (en) * | 2010-06-30 | 2010-11-10 | 中冶焦耐(大连)工程技术有限公司 | Full-denitrification treatment process of coked wastewater by adopting biological membrane method |
| CN109607965A (en) * | 2019-01-09 | 2019-04-12 | 湖北君集水处理有限公司 | A kind of system and method for sewage treatment plant tail water advanced nitrogen dephosphorization |
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- 2019-10-31 CN CN201911051803.9A patent/CN112744978A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101880109A (en) * | 2010-06-30 | 2010-11-10 | 中冶焦耐(大连)工程技术有限公司 | Full-denitrification treatment process of coked wastewater by adopting biological membrane method |
| CN109607965A (en) * | 2019-01-09 | 2019-04-12 | 湖北君集水处理有限公司 | A kind of system and method for sewage treatment plant tail water advanced nitrogen dephosphorization |
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Application publication date: 20210504 |