CN112919725A - High-concentration oily wastewater treatment process - Google Patents

High-concentration oily wastewater treatment process Download PDF

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Publication number
CN112919725A
CN112919725A CN201911242576.8A CN201911242576A CN112919725A CN 112919725 A CN112919725 A CN 112919725A CN 201911242576 A CN201911242576 A CN 201911242576A CN 112919725 A CN112919725 A CN 112919725A
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wastewater
treatment
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coagulant
tank
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舒建军
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Hunan Jin Yi Environmental Protection Co ltd
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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
    • 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
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • 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
    • C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
    • 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
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • 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

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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)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

The invention discloses a high-concentration oily wastewater treatment process which comprises the following steps of S1 pretreatment, S2 demulsification, S3 deep anaerobic treatment, S4 electrocatalytic oxidation, S5 deep treatment and S6 BAF treatment. The invention has the characteristics of preventing MBR from blocking and blocking pipelines and equipment, being efficient and energy-saving, and the like, and the coagulant, the demulsifier and the filter aid can effectively solve the problem of blocking and fouling by treating the wastewater at different stages, thereby being a very practical wastewater treatment process.

Description

High-concentration oily wastewater treatment process
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a high-concentration oily wastewater treatment process.
Background
The high-concentration oily wastewater mainly contains floating oil, emulsified oil and macromolecular organic matters, has poor biodegradability and is difficult to be directly degraded through biochemistry. In particular, the emulsified oil-containing wastewater can be precipitated together with suspended particles and iron scales in the wastewater in process facilities and pipeline equipment to form oil sludge with larger viscosity, so that pipelines and equipment are blocked to influence the normal production, and therefore, the oily wastewater needs to be effectively treated.
The oily wastewater has high CODcrBasically, the wastewater treatment method is more than 1000mg/L, even up to tens of thousands to hundreds of thousands, and some wastewater has the characteristics of poor biodegradability, low BOD value, easy biotoxicity and difficult degradation, and the like, so that the general conventional wastewater treatment method has difficult ideal effects, and particularly has more complicated conditions when the wastewater exists in the form of organic oily wastewater.
Related industrial enterprises and various research institutions continuously research treatment technologies of high-salinity wastewater containing volatile organic compounds, and the main research methods include biological methods, physical methods, chemical methods or combination of the methods.
The biological method for treating the microbial strains has toxic action on the microorganisms, so that a biochemical treatment system is seriously interfered, the microbial acclimation period is longer, and the treatment efficiency of a sewage treatment system is reduced. Thus, biological methods have certain limitations for treating oily wastewater.
The chemical method treatment method has the characteristics of rapid reaction, relatively thorough treatment and the like, but most of chemical methods need to add a large amount of chemical agents, so the method has the defects of high cost, easy generation of secondary pollutants and difficult application to an actual sewage treatment system.
In summary, a new treatment approach is still needed to be found in the process for treating the organic wastewater containing high-concentration oil, so as to adopt the optimized combination of different technologies to realize a more efficient and high-salinity organic wastewater treatment technology.
Disclosure of Invention
The invention aims to solve the problems, provides a high-concentration oily wastewater treatment process, has the characteristics of preventing MBR from blocking and blocking pipelines and equipment, being efficient and energy-saving, effectively solves the problem of blocking and fouling by treating the wastewater at different stages with a coagulant, a demulsifier and a filter aid, and is a very practical wastewater treatment process.
In order to realize the purpose, the invention adopts the technical scheme that: a process for treating high-concentration oily wastewater comprises the following steps:
s1, preprocessing: discharging the high-concentration oily wastewater into an oil separation tank to remove suspended matters; carrying out air floatation treatment on the discharged wastewater, and carrying out primary separation on the wastewater and oil; adjusting pH, adding coagulant for precipitation;
s2, demulsification: filtering the wastewater in S1, adding a demulsifier, and performing demulsification treatment at 25-55 ℃ to separate residual oil from water; adding a coagulant for precipitation;
s3, deep anaerobic treatment: adopting a UASB anaerobic reactor to carry out anaerobic treatment on the mixed sewage after deep oil removal of S3, removing macromolecular organic matters and changing the macromolecular organic matters into micromolecular organic matters;
s4, electrocatalytic oxidation: carrying out electrocatalytic oxidation on the S2 wastewater to degrade organic pollutants;
s5, deep processing: performing advanced treatment by adopting an MBR process, filtering the wastewater treated by S4 through a solid-phase microfiltration membrane in an MBR process tank, and discharging the filtered wastewater into a collection tank;
s6, BAF processing: adding the coagulant into the wastewater treated in the S5 again, standing, performing solid-liquid separation to obtain the sentiment after advanced treatment, introducing aeration into the purified water, and performing biological advanced treatment in the biological filter to obtain water quality reaching the purified water discharge standard.
Further, the coagulant comprises polyaluminium chloride and polyaluminium ferric chloride, and the molar ratio is 1: 1-3.
Further, the demulsifier is polyacrylamide PAM.
Further, a sulfuric acid solution is added as a PH adjuster to S1, and the adjusted PH is a weakly acidic solution of 6 or more.
Further, the demulsifier in the S2 solution is polyacrylamide PAM, and the molar ratio of polyaluminium chloride, polyaluminium ferric chloride and polyacrylamide PAM is 1: 1-3: 1-2; the concentration of the added polyacrylamide PAM in the S2 solution is 50-80 mg/L.
Furthermore, the solid phase microfiltration membrane separation unit adopts a microfiltration membrane element with the filtration precision of 4-8nm and the oil resistance of 800-1400 ppm.
Further, a filter aid is added during the filtration of the micro-filtration membrane, the filter aid is modified organic clay, the filtration temperature is 20-35 ℃, and the membrane surface flow rate is 3-8 m.s-1The transmembrane pressure difference is between 0.10 and 0.3MPa, the membrane flux is 200-260 L.m-2·h-1。
Further, COD of the high-concentration oily wastewatercr30000-180000 mg/L.
Further, after advanced treatment of S5, the discharged water CODcrIs less than or equal to 80 mg/L.
The invention has the beneficial effects that:
1. the invention greatly simplifies the process flow of the existing high-concentration organic wastewater treatment by effectively combining air floatation treatment, twice coagulant precipitation and demulsification treatment, so that the high-concentration oily wastewater is changed into wastewater for removing a large amount of grease, the treatment capacity of organic matters in the wastewater is reduced, the treatment difficulty is reduced, and the cost of wastewater treatment is obviously reduced.
2. The filter aid is added during the filtration of the microfiltration membrane, so that the service life of the microfiltration membrane is effectively prolonged, and the water quality is more stable; the deep anaerobic treatment of S3 and the electrocatalytic oxidation of S4 decompose a large amount of organic molecules in the wastewater, so that the sludge yield is reduced during the filtration of the filter membrane; the modified organic clay acts on the micro-filtration membrane as a filter aid, acts with S3 and S4 together, increases the frequency of sludge discharge, and effectively solves the problem of filter membrane fouling. The filter aid in the membrane process can reduce membrane pollution, and the membrane flux is 240 L.m < -2 > h < -1 > under the conditions of 30 ℃ of temperature, 5 m.s < -1 > of membrane surface flow rate and 0.10MPa of transmembrane pressure difference, which is increased by 95 percent compared with direct microfiltration.
3. In the invention, when the pH value of the acidic solution with the pH value being more than or equal to 6 in S1 and PAFC and PAF jointly treat emulsified oil-containing wastewater, the existence form of aluminum salt hydrolysate is [ AL13(OH)34]5+, and simultaneously most of colloid accounts for the same time, and the aluminum salt hydrolysate can rapidly generate the effects of adsorption bridging, rolling sweeping, inclusion and the like with suspended matters, colloid and the like in a water body, finally generates reticular sediment to purify the emulsified wastewater, and has good flocculation effect; the generated ferric salt has quick flocculation and sedimentation, good cooling and turbidity reduction treatment performance and small corrosion to equipment pipelines; when PAFC, PAF and PAM act together, the consumption of PAF and PAM is reduced, the consumption of coagulant and emulsifier is reduced, the precipitation effect and demulsification effect are improved, the produced flocculent slag has large and compact body, low water content, good settling and dewatering performance and easy subsequent treatment.
4. In the invention, the S3 deep anaerobic treatment is carried out to remove macromolecular organic matters and change the macromolecular organic matters into micromolecular organic matters, and the S4 electrocatalytic oxidation improves the removal efficiency of residual pollutants in the wastewater and enables large colloidal impurities and suspended particle impurities to be coagulated and removed; and only organic matters in the sewage are decomposed by utilizing hydroxyl radicals with strong oxidizing capability generated under the action of an electric field; meanwhile, chlorine ions in the sewage are oxidized into hypochlorous acid, so that organic pollutants are effectively oxidized and decomposed, and microorganisms are killed; the method has the advantages that the deep anaerobic treatment of S3 and the electrocatalytic oxidation of S4 effectively remove most organic matters in the wastewater, reduce the workload of the MBR process, save resources and provide a foundation for solving the problems of MBR pollution blockage and pipeline blockage.
Detailed Description
The present invention is described in detail below for the purpose of better understanding technical solutions of the present invention by those skilled in the art, and the description of the present invention is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.
A process for treating high-concentration oily wastewater comprises the following steps:
s1, preprocessing: discharging the high-concentration oily wastewater into an oil separation tank to remove suspended matters; carrying out air floatation treatment on the discharged wastewater, and carrying out primary separation on the wastewater and oil; adjusting pH, adding coagulant for precipitation;
s2, demulsification: filtering the wastewater in S1, adding a demulsifier, and performing demulsification treatment at 25-55 ℃ to separate residual oil from water; adding a coagulant for precipitation;
s3, deep anaerobic treatment: adopting a UASB anaerobic reactor to carry out anaerobic treatment on the mixed sewage after deep oil removal of S3;
s4, electrocatalytic oxidation: carrying out electrocatalytic oxidation on the S2 wastewater to degrade organic pollutants;
s5, deep processing: performing advanced treatment by adopting an MBR process, filtering the wastewater treated by S4 through a solid-phase microfiltration membrane in an MBR process tank, and discharging the filtered wastewater into a collection tank;
s6, BAF processing: adding the coagulant into the wastewater treated in the S5 again, standing, performing solid-liquid separation to obtain the sentiment after advanced treatment, introducing aeration into the purified water, and performing biological advanced treatment in the biological filter to obtain water quality reaching the purified water discharge standard.
Preferably, the coagulant comprises polyaluminium chloride and polyaluminium ferric chloride, and the molar ratio is 1: 1-3.
Preferably, the demulsifier is Polyacrylamide (PAM).
Preferably, a sulfuric acid solution is added as a PH adjuster to S1, and the PH after adjustment is a weakly acidic solution of 6 or more. .
Preferably, the demulsifier in the S2 solution is polyacrylamide PAM, and the molar ratio of polyaluminium chloride, polyaluminium ferric chloride and polyacrylamide PAM is 1: 1-3: 1-2; the concentration of the added polyacrylamide PAM in the S2 solution is 50-80 mg/L.
Preferably, the solid-phase microfiltration membrane separation unit adopts microfiltration membrane elements with the filtration precision of 4-8nm and the oil resistance of 800-1400 ppm.
Preferably, a filter aid is added during the microfiltration membrane filtration, the filter aid is modified organic clay, the filtration temperature is 20-35 ℃, and the membrane surface flow rate is 3-8 m.s-1The transmembrane pressure difference is between 0.10 and 0.3MPa, the membrane flux is 200-260 L.m-2·h-1。
Preferably, the COD of the high-concentration oily wastewatercr30000-180000 mg/L.
Preferably, after the advanced treatment of S5, the discharged water CODcr is less than or equal to 80 mg/L.
Example 1:
a process for treating high-concentration oily wastewater comprises the following steps:
s1, preprocessing: discharging high-concentration oily wastewater into an oil separation tank, wherein COD of the high-concentration oily wastewatercr85000 mg/L; removing suspended matters; carrying out air floatation treatment on the discharged wastewater, and carrying out primary separation on the wastewater and oil; adjusting pH, adding coagulant for precipitation;
s2, demulsification: filtering the wastewater in S1, adding a demulsifier, and performing demulsification treatment at 25 ℃ to separate residual oil from water; adding a coagulant for precipitation; the demulsifier is polyacrylamide PAM. The demulsifier in the S2 solution is polyacrylamide PAM, the coagulant comprises polyaluminium chloride and polyaluminium ferric chloride, and the molar ratio is 1: 1. s1, adding a sulfuric acid solution as a pH regulator, and adjusting the pH to be a weak acidic solution with the pH of 6. The molar ratio of polyaluminium chloride, polyaluminium ferric chloride and polyacrylamide PAM in the solution is 1: 1: 1; the concentration of the added polyacrylamide PAM in the S2 solution is 50 mg/L.
S3, deep anaerobic treatment: adopting a UASB anaerobic reactor to carry out anaerobic treatment on the mixed sewage after deep oil removal of S3, removing macromolecular organic matters and changing the macromolecular organic matters into micromolecular organic matters;
s4, electrocatalytic oxidation: carrying out electrocatalytic oxidation on the S2 wastewater to degrade organic pollutants;
s5, deep processing: and (3) performing advanced treatment by adopting an MBR process, filtering the wastewater treated by the S4 through a solid-phase microfiltration membrane in an MBR process tank, and discharging the filtered wastewater into a collecting tank. The solid-phase microfiltration membrane separation unit adopts a microfiltration membrane element with the filtration precision of 4nm and the oil resistance of 800 ppm. Adding a filter aid during the filtration of the micro-filtration membrane, wherein the filter aid is modified organic clay, the filtration temperature is 20 ℃, and the membrane surface flow rate is 3 m.s-1The membrane flux was 200 L.m under the transmembrane pressure difference of 0.10MPa-2·h-1. After the advanced treatment of S5, the discharged water CODcr is less than or equal to 60 mg/L;
s6, BAF processing: adding the coagulant into the wastewater treated in the S5 again, standing, performing solid-liquid separation to obtain the sentiment after advanced treatment, introducing aeration into the purified water, and performing biological advanced treatment in the biological filter to obtain water quality reaching the purified water discharge standard.
Example 2
A process for treating high-concentration oily wastewater comprises the following steps:
s1, preprocessing: discharging high-concentration oily wastewater into an oil separation tank, wherein COD of the high-concentration oily wastewatercr166000 mg/L; removing suspended matters; carrying out air floatation treatment on the discharged wastewater, and carrying out primary separation on the wastewater and oil; adjusting pH, adding coagulant for precipitation; s2, demulsification: filtering the wastewater in S1, adding a demulsifier, and performing demulsification treatment at 55 ℃ to separate residual oil from water; adding a coagulant for precipitation; the demulsifier is polyacrylamide PAM. The demulsifier in the S2 solution is polyacrylamide PAM, the coagulant comprises polyaluminium chloride and polyaluminium ferric chloride, and the molar ratio is 1: 3. s1, adding a sulfuric acid solution as a pH regulator, and adjusting the pH to be a weak acidic solution with 6.8. The molar ratio of polyaluminium chloride, polyaluminium ferric chloride and polyacrylamide PAM in the solution is 1: 3: 2; the concentration of the added polyacrylamide PAM in the S2 solution is 80 mg/L.
S3, deep anaerobic treatment: adopting a UASB anaerobic reactor to carry out anaerobic treatment on the mixed sewage after deep oil removal of S3, removing macromolecular organic matters and changing the macromolecular organic matters into micromolecular organic matters;
s4, electrocatalytic oxidation: carrying out electrocatalytic oxidation on the S2 wastewater to degrade organic pollutants;
s5, deep processing: and (3) performing advanced treatment by adopting an MBR process, filtering the wastewater treated by the S4 through a solid-phase microfiltration membrane in an MBR process tank, and discharging the filtered wastewater into a collecting tank. The solid-phase microfiltration membrane separation unit adopts a microfiltration membrane element with the filtration precision of 8nm and the oil resistance of 1400 ppm. Adding a filter aid during the filtration of the micro-filtration membrane, wherein the filter aid is modified organic clay, the filtration temperature is 35 ℃, and the membrane surface flow rate is 8 m.s-1The membrane flux is 260 L.m under the condition of 0.30Mpa of transmembrane pressure difference-2·h-1. After the advanced treatment of S5, the discharged water CODcr is less than or equal to 70 mg/L;
s6, BAF processing: adding the coagulant into the wastewater treated in the S5 again, standing, performing solid-liquid separation to obtain the sentiment after advanced treatment, introducing aeration into the purified water, and performing biological advanced treatment in the biological filter to obtain water quality reaching the purified water discharge standard.
Example 3
A process for treating high-concentration oily wastewater comprises the following steps:
s1, preprocessing: discharging high-concentration oily wastewater into an oil separation tank, wherein COD of the high-concentration oily wastewatercr120000 mg/L; removing suspended matters; carrying out air floatation treatment on the discharged wastewater, and carrying out primary separation on the wastewater and oil; adjusting pH, adding coagulant for precipitation;
s2, demulsification: filtering the wastewater in S1, adding a demulsifier, and performing demulsification treatment at 55 ℃ to separate residual oil from water; adding a coagulant for precipitation; the demulsifier is polyacrylamide PAM. The demulsifier in the S2 solution is polyacrylamide PAM, the coagulant comprises polyaluminium chloride and polyaluminium ferric chloride, and the molar ratio is 1: 2. s1, adding a sulfuric acid solution as a pH regulator, and adjusting the pH to be a weak acidic solution with 6.5. The molar ratio of polyaluminium chloride, polyaluminium ferric chloride and polyacrylamide PAM in the solution is 1: 2: 1.5; the concentration of the added polyacrylamide PAM in the S2 solution is 60 mg/L.
S3, deep anaerobic treatment: adopting a UASB anaerobic reactor to carry out anaerobic treatment on the mixed sewage after deep oil removal of S3, removing macromolecular organic matters and changing the macromolecular organic matters into micromolecular organic matters;
s4, electrocatalytic oxidation: carrying out electrocatalytic oxidation on the S2 wastewater to degrade organic pollutants;
s5, deep processing: and (3) performing advanced treatment by adopting an MBR process, filtering the wastewater treated by the S4 through a solid-phase microfiltration membrane in an MBR process tank, and discharging the filtered wastewater into a collecting tank. The solid-phase microfiltration membrane separation unit adopts a microfiltration membrane element with the filtration precision of 6nm and the oil resistance of 1250 ppm. Adding a filter aid during the filtration of the micro-filtration membrane, wherein the filter aid is modified organic clay, the filtration temperature is 28 ℃, and the membrane surface flow rate is 6 m.s-1The membrane flux is 210 L.m under the condition of 0.20Mpa of transmembrane pressure difference-2·h-1. After the advanced treatment of S5, the discharged water CODcr is less than or equal to 80 mg/L;
s6, BAF processing: adding the coagulant into the wastewater treated in the S5 again, standing, performing solid-liquid separation to obtain the sentiment after advanced treatment, introducing aeration into the purified water, and performing biological advanced treatment in the biological filter to obtain water quality reaching the purified water discharge standard.
Comparative example 1
In this comparative example, no coagulant was added. The rest of the procedure was the same as in example 3.
Comparative example 2
In this comparative example, no demulsifier was added. The rest of the procedure was the same as in example 3.
Comparative example 3
In this comparative example, no coagulant was added. The coagulant comprises polyaluminium chloride and polyaluminium ferric chloride, the demulsifier in the S2 solution is polyacrylamide PAM, and the molar ratio of the polyaluminium chloride to the polyaluminium ferric chloride to the polyacrylamide PAM in the solution is 1: 4: the concentration of the polyacrylamide PAM in the 1, S2 solution after being added is 20 mg/L. The rest of the procedure was the same as in example 3.
The CODcr contents obtained from the treatment of the high-salt high-concentration organic wastewater in the above examples are summarized in the following table.
Table 1, the CODcr content scale measured at each treatment stage in the examples.
Figure BDA0002306669490000071
Figure BDA0002306669490000081
As can be seen from the above table, the combined process adopted by the invention enables CODcr of the high-concentration oily organic wastewater to account for more than 99% of the original wastewater, achieves the discharge standard of fresh water, and greatly reduces the CODcr, wherein when PAFC, PAF and PAM act together, the consumption of PAF and PAM is reduced, the consumption of coagulant and emulsifier is reduced, and the precipitation effect and demulsification effect are improved. The method has the advantages that the deep anaerobic treatment of S3 and the electrocatalytic oxidation of S4 effectively remove most of the organic matters remained in the wastewater, reduce the workload of the MBR process, save resources, and effectively solve the problems of MBR pollution blockage and pipeline blockage to enable the discharged wastewater to reach the fresh water discharge standard.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes may be made without departing from the principle of the present invention, and the technical features described above may be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.

Claims (10)

1. A process for treating high-concentration oily wastewater is characterized by comprising the following steps:
s1, preprocessing: discharging the high-concentration oily wastewater into an oil separation tank to remove suspended matters; carrying out air floatation treatment on the discharged wastewater, and carrying out primary separation on the wastewater and oil; adjusting pH, adding coagulant for precipitation;
s2, demulsification: filtering the wastewater in S1, adding a demulsifier, and performing demulsification treatment at 25-55 ℃ to separate residual oil from water; adding a coagulant for precipitation;
s3, deep anaerobic treatment: adopting a UASB anaerobic reactor to carry out anaerobic treatment on the mixed sewage after deep oil removal of S3;
s4, electrocatalytic oxidation: carrying out electrocatalytic oxidation on the S2 wastewater to degrade organic pollutants;
s5, deep processing: and (3) performing advanced treatment by adopting an MBR process, filtering the wastewater treated by the S4 through a solid-phase microfiltration membrane in an MBR process tank, and discharging the filtered wastewater into a collecting tank.
S6, BAF processing: adding the coagulant into the wastewater treated in the S5 again, standing, performing solid-liquid separation to obtain the sentiment after advanced treatment, introducing aeration into the purified water, and performing biological advanced treatment in the biological filter to obtain water quality reaching the purified water discharge standard.
2. The process for treating high-concentration oily wastewater according to claim 1, wherein the coagulant comprises polyaluminium chloride and polyaluminium ferric chloride, and the molar ratio is 1: 1-3.
3. The process of claim 1, wherein the demulsifier is Polyacrylamide (PAM).
4. The process of claim 1, wherein the pH of the solution of sulfuric acid added to S1 is a weak acidic solution of 6 or more.
5. The process for treating high-concentration oily wastewater according to claim 1, wherein the demulsifier in the S2 solution is polyacrylamide PAM, and the molar ratio of polyaluminum chloride, polyaluminum ferric chloride and polyacrylamide PAM is 1: 1-3: 1-2; the concentration of the added polyacrylamide PAM in the S2 solution is 50-80 mg/L.
6. The process as claimed in claim 1, wherein the solid-phase microfiltration membrane separation unit comprises microfiltration membrane elements with a filtration precision of 4-8nm and oil resistance of 800-1400 ppm.
7. The process according to claim 1, wherein a filter aid is added during the filtration with the microfiltration membrane, the filter aid is a modified organoclay, the filtration temperature is 20-35 ℃, and the membrane surface flow rate is 3-8 m.s-1The transmembrane pressure difference is between 0.10 and 0.3MPa, the membrane flux is 200-260 L.m-2·h-1。
8. The process according to claim 1, wherein the COD of the high concentration oily wastewater iscr30000-180000 mg/L.
9. The process of claim 1, wherein the discharged water COD is treated by S5crIs less than or equal to 80 mg/L.
10. The process of claim 1, wherein when the sludge concentration in the MBR process tank in S5 is less than 8g/L, the wastewater is continuously introduced into the MBR process tank for filtration, and when the sludge concentration in the MBR process tank is more than 15g/L, the sludge discharge frequency in the tank is increased, so that the sludge concentration in the MBR process tank is always kept at 8-15 g/L.
CN201911242576.8A 2019-12-06 2019-12-06 High-concentration oily wastewater treatment process Pending CN112919725A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN200999217Y (en) * 2007-05-16 2008-01-02 王宝贞 Composite membrane bioreactor
CN203461924U (en) * 2013-06-03 2014-03-05 广西汇泰环保科技有限公司 Grain and oil production sewage treatment system
CN206915935U (en) * 2017-03-28 2018-01-23 苏州博瑞水处理有限公司 Emulsifying liquid waste water processing system
CN108706816A (en) * 2018-05-07 2018-10-26 苏州亚得宝消防设备有限公司 A kind of house refuse sewage treatment process

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN200999217Y (en) * 2007-05-16 2008-01-02 王宝贞 Composite membrane bioreactor
CN203461924U (en) * 2013-06-03 2014-03-05 广西汇泰环保科技有限公司 Grain and oil production sewage treatment system
CN206915935U (en) * 2017-03-28 2018-01-23 苏州博瑞水处理有限公司 Emulsifying liquid waste water processing system
CN108706816A (en) * 2018-05-07 2018-10-26 苏州亚得宝消防设备有限公司 A kind of house refuse sewage treatment process

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