CN105174644A - Efficient treatment combination process of acrylonitrile wastewater - Google Patents
Efficient treatment combination process of acrylonitrile wastewater Download PDFInfo
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- CN105174644A CN105174644A CN201510656003.5A CN201510656003A CN105174644A CN 105174644 A CN105174644 A CN 105174644A CN 201510656003 A CN201510656003 A CN 201510656003A CN 105174644 A CN105174644 A CN 105174644A
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Abstract
The invention belongs to the field of chemical wastewater treatment of the petrochemical industry and particularly relates to an efficient treatment combination process of acrylonitrile wastewater. The combination process comprises: (1) acrylonitrile production wastewater enters a catalytic oxidation tower for catalytic hydrogen peroxide oxidation treatment; (2) water discharged form the catalytic oxidation tower and factory domestic sewage enter a biochemical treatment system after full mixing; the biochemical treatment system sequentially comprises an anaerobic hydrolysis tank, an anoxia tank and an MBR tank; (3) the biochemical treatment system adopts a membrane separation technique for treatment; partial concentrated solution flows back; the acrylonitrile production wastewater is wastewater produced by acrylonitrile device wastewater after four-effect evaporation and steam stripping; the temperature is 50 DEG C-80 DEG C; the hydraulic retention time in the catalytic oxidation tower is 30-120 min. According to the efficient treatment combination process of acrylonitrile wastewater, the microorganism poison inhibition effect of the biochemical treatment system microorganism can be reduced, the wastewater biodegradability is improved, the treatment load and the treatment cost of the catalytic oxidation tower are reduced, the denitrification effect is guaranteed, and the membrane service life is prolonged.
Description
Technical field
The invention belongs to petrochemical industry chemical wastewater treatment field, particularly a kind of efficient treatment combination technique of acrylic nitrile waste water high-level oxidation technology, biochemical processing and membrane separation technique organically combined.
Background technology
Vinyl cyanide is a kind of important Organic Chemicals, produce except acrylic fibers except main, also for the production of ABS, AS, acrylamide, paracril and nitrile rubber, adiponitrile/diamines, vinyl cyanide barrier resin, polyacrylonitrile carbon fiber etc., purposes widely.The conventional process of current domestic production vinyl cyanide is propylene ammmoxidation process, namely with propylene, ammonia and air for main raw material, under the effect of certain reaction conditions and catalyzer, produce vinyl cyanide, by-product acetonitrile and prussic acid.The acrylic nitrile waste water organic content produced in aforesaid propylene nitrile production process is high, pollutant component is extremely complicated, at least containing more than ten organism such as vinyl cyanide, acetonitrile, prussic acid, propenal, vinylformic acid, cyanopyridine, maleimide, ammonium sulfate and large weight oligomers.High prussiate (or nitrile compound) is a key character of acrylic nitrile waste water, these have strong toxicity and restraining effect containing nitrile compound to microorganism, be listed in the pollutent of priority acccess control, if directly enter biochemical treatment system can cause very large impact to system.Another large feature of acrylic nitrile waste water is that organonitrogen and TN content are high, about can account for 20%, be converted into ammonia nitrogen and nitric nitrogen in wastewater biochemical treating processes in all contaminants, because C/N is than low, causes ammonia nitrogen and total nitrogen to be difficult to reach emission standard.What require industrial wastewater discharge along with country improves constantly, and the qualified discharge of acrylic nitrile waste water has become the important factor of restriction vinyl cyanide and downstream industry development thereof.
Acrylic nitrile waste water is as the high-concentration organic sewage difficult to degrade of generally acknowledging, current main methods comprises pressurizing hydrolysis, burning method, Wet Catalytic Oxidation Method, Ozonation, Coagulation Method, biochemical process etc.Pressurizing hydrolysis utilizes Wastewater from Acrylonitrile Production at high temperature to pressurize by the feature of caustic digestion, generally first can to carry out pre-treatment by this method to quenched water, then processed by biochemical process.The investment of this method is less, but needs to consume a large amount of fresh waters, there is final outflow water salts contg too high, the problems such as secondary pollution environment.Waste water is at high temperature carried out oxygenolysis by burning method, wherein organism is made to generate water and the innoxious substance such as carbonic acid gas, nitrogen and enter air, owing to also containing the components such as sulphur ammonium, acetonitrile in Wastewater from Acrylonitrile Production, burn the flue gas produced and can produce the problems such as fouling, blocking, corrosion, simultaneously, burn and consume a large amount of fuel, processing cost is higher.The pollutents such as the CODcr of Coal Gas Washing Cycling Water and nitrile can be transformed into CO through catalyzed oxidation by Wet Catalytic Oxidation Method
2, N
2and H
2the harmless components such as O, process is comparatively thorough, and its difficult point is the catalyzer developing excellent property.Biochemical process is a kind of technology in water treatment field widespread use, but because Wastewater from Acrylonitrile Production nitrile compounds content is high, they have very strong toxicity and restraining effect to microorganism, so adopt conventional anoxic or Aerobic biological process water outlet to be difficult to reach emission standard.At present conventional means are to reach the treatment effect of expection by biochemical process and other materializing strategy technology couplings.Chinese invention patent CN102399044A provides a kind of integrated processing method of Wastewater from Acrylonitrile Production, first Wastewater from Acrylonitrile Production enters equalizing tank and carries out Homogeneous phase mixing, then enter A/O biochemical treatment tank and carry out biochemical treatment, water outlet enters reverse osmosis unit and carries out reverse-osmosis treated after uf processing.Chinese invention patent CN103304096A provides a kind of method of ozone catalytic coupled biological nitration treatment acrylic nitrile waste water, first water enters the equilibrium that equalizing tank carries out water quality and quantity, after flowing through preoxidation tower and catalyzed oxidation tower again, ozone residual in pond removal water is removed from flowing into ozone, carry out the removal of ammonia nitrogen through nitrification tank, discharge from clean water basin and finally produce water.The treatment process of above-mentioned biochemical process and physico-chemical process coupling realizes qualified discharge for acrylic nitrile waste water and serves obvious promoter action, but treatment process ubiquity goes out the problems such as olighydria safeguards up to standard to acrylic nitrile waste water feature understanding deficiency, biochemical system denitrification functions imperfection, biochemical system at present.Therefore, a kind of efficient treatment process efficiently can removing hazardous contaminant and itrogenous organic substance in waste water is developed on abundant analysis acrylic nitrile waste water water quality characteristic basis and become current problem in the urgent need to address.
Summary of the invention
The object of the invention is to go out the problems such as olighydria safeguards up to standard for existing acrylic nitrile waste water treatment process is ubiquitous to waste water feature understanding deficiency, biochemical system denitrification functions imperfection, biochemical system, provide a kind of acrylic nitrile waste water high-level oxidation technology, biochemical processing and membrane separation technique organically combined efficient treatment combination technique.This technique can reduce the murder by poisoning restraining effect to biochemical treatment system microorganism, improves the biodegradability of waste water, reduces processing load and the processing cost of catalyzed oxidation tower, ensures denitrification effect, extend the work-ing life of film.
For solving the problems of the technologies described above, the present invention realizes like this.
An efficient treatment combination technique for acrylic nitrile waste water, it comprises following processing step.
(1) Wastewater from Acrylonitrile Production enters catalyzed oxidation tower and carries out catalyzing hydrogen peroxide oxide treatment.
(2) water outlet of catalyzed oxidation tower and plant area sanitary sewage enter biochemical treatment system after fully mixing; Described biochemical treatment system comprises anaerobic fixed film reactor, anoxic pond and MBR pond successively.
(3) biochemical treatment system effluent adopting membrane isolation technique carries out advanced treatment; Gained is purified waste water standard discharge; Concentrated solution is partly refluxed to step (1).
As a kind of preferred version, Wastewater from Acrylonitrile Production of the present invention is the waste water that acrylonitrile installation sewage produces after four-effect evaporation and stripping; Temperature is 50 ~ 80 DEG C; Hydraulic detention time in catalyzed oxidation tower is 30 ~ 120min.
Further, catalyzed oxidation tower of the present invention is the one in fixed bed, fluidized-bed or moving-bed; The catalyzer that described catalyzing hydrogen peroxide oxide treatment adopts is loaded catalyst; Carrier is silicon-based mesoporous molecular sieve; Active ingredient is one or more the mixture in Cu, Mn, Co, Ni, Ce, La and metal oxide thereof.
Further, the catalyzer that catalyzing hydrogen peroxide oxide treatment of the present invention adopts is loaded catalyst; Carrier is SBA-16 mesopore molecular sieve; Active ingredient is nano Ce O.
Further, in step of the present invention (2), the water outlet of catalyzed oxidation tower and plant area's sanitary sewage volume flow proportion are 1:2 ~ 6.
Further, arrange filler respectively in anaerobic fixed film reactor and anoxic pond in step of the present invention (2), packing ratio is 25 ~ 30%; Packing material size is 1 ~ 3cm; Specific surface area is not less than 600m
2/ m
3, filler proportion is 0.85 ~ 1.05g/cm
3.
Further, in step of the present invention (2), the membrane module in MBR pond is plate and frame, spiral wound, circular pipe type, hollow fiber form or capillary type; Membrane pore size is 0.1 ~ 0.4 μm.
Further, the hydraulic detention time of Wastewater from Acrylonitrile Production of the present invention in anaerobic fixed film reactor, anoxic pond and MBR pond is followed successively by 10 ~ 22h, 4 ~ 12h and 6 ~ 18h; Anaerobic fixed film reactor volumetric loading is 2 ~ 10kgCOD/m
3d; MBR pool volume load is 1 ~ 3kgCOD/m
3d.
Further, the MBR pond of biochemical treatment system of the present invention is provided with nitrification liquid reflux; Nitrification liquid is back to anoxic pond feed-water end; Reflux ratio is 100 ~ 300%.
Further, the membrane module that in step of the present invention (3), membrane separation technique adopts is nanofiltration membrane or reverse osmosis membrane; Working temperature is normal temperature to 50 DEG C, and operating pressure is 0.5 ~ 10MPa.
The present invention fully combines the advantage of the technology such as advanced oxidation, biochemical treatment, membrane sepn, effectively can not only to reduce in waste water hazardous contaminant to the impact of biochemical treatment system, and make biochemical treatment system form Co metabolism effect due to being mixed into of sanitary sewage, substantially increase processing efficiency, the simultaneously application of membrane separation technique ensure that the qualified discharge steady in a long-term of acrylic nitrile waste water, and creates precondition for Treated sewage reusing.The present invention, compared with existing acrylic nitrile waste water treatment process, can obtain following effect.
(1) catalyzing hydrogen peroxide oxidation takes full advantage of the higher feature of acrylic nitrile waste water temperature, solve and directly add the undesirable problem of hydrogen peroxide treatment effect, the hazardous contaminants such as the vinyl cyanide in waste water, acetonitrile are decomposed, reduce the murder by poisoning restraining effect to biochemical treatment system microorganism, improve the biodegradability of waste water.
(2) acrylic nitrile waste water and plant area's sanitary sewage " source dual treatment ", reduce processing load and the processing cost of catalyzed oxidation tower, give full play to again Co metabolism effect in biochemical system combination treatment simultaneously, improve biochemical system to the processing power of hardly degraded organic substance in acrylic nitrile waste water and treatment effect.
(3) biochemical treatment system anaerobic fixed film reactor further increases the biodegradability of waste water, reduce the organic loading of subsequent disposal, and anoxic pond and MBR pond collectively form the A/O technique of biological denitrificaion, the application of Simultaneous Nitrification liquid return-flow system and membrane technique enhances the denitrification functions of whole system, ensure that denitrification effect.
(4) adopt membrane separation technique to carry out advanced treatment to biochemical system water outlet, remove hard-degraded substance and salt in waste water further, guaranteeing role up to standard is played to effluent quality.High frequency diaphragm significantly reduces fouling membrane, decreases the frequency of Membrane cleaning, extends the work-ing life of film, thus greatly reduces cost for wastewater treatment.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the invention will be further described.Protection scope of the present invention is not only confined to the statement of following content.
Fig. 1 is the efficient treatment combination process flow sheet of acrylic nitrile waste water of the present invention.
Embodiment
As shown in Figure 1, acrylonitrile installation sewage is through four-effect evaporation, first the waste water produced after stripping enter catalyzed oxidation tower and carry out catalyzing hydrogen peroxide oxide treatment, catalyzer is loaded catalyst, carrier is silicon-based mesoporous molecular sieve, biochemical treatment system is entered after the water outlet of catalyzed oxidation tower and plant area sanitary sewage fully mix, biochemical treatment system comprises anaerobic fixed film reactor, anoxic pond, MBR pond, MBR pond arranges nitrification liquid reflux, biochemical treatment system effluent adopting membrane isolation technique carries out advanced treatment, gained is purified waste water standard discharge or reuse, concentrated solution is partly refluxed to technique foremost.
embodiment 1.
Acrylic nitrile waste water efficient treatment combination technique catalyzed oxidation tower is intake the waste water produced after four-effect evaporation, stripping for acrylonitrile installation sewage, and its water-quality guideline is as follows: COD2081mg/L, NH
3-N34.9mg/L, TN337mg/L, pH7.40, CN
-7.73mg/L, vinyl cyanide (AN) 0.30mg/L, water temperature 65 DEG C.
The water-quality guideline of plant area's sanitary sewage is as follows: COD340mg/L, BOD
5176mg/L, NH
3-N23.4mg/L, SS167mg/L, pH7.16.
As shown in Figure 1, first Wastewater from Acrylonitrile Production enters catalyzed oxidation tower and carries out catalyzing hydrogen peroxide oxide treatment, and catalyzer is loaded catalyst, carrier S BA-16 mesopore molecular sieve, active ingredient is nano Ce O, and catalyzed oxidation tower adopts upflow fixed bed form, and hydraulic detention time is 60min.Enter biochemical treatment system after the water outlet of catalyzed oxidation tower and plant area sanitary sewage fully mix according to volumetric flow rate 1:4 ratio, arrange filler in biochemical treatment system anaerobic fixed film reactor and anoxic pond, packing ratio is 30%, and packing material size is 3cm, and specific surface area is 650m
2/ m
3, filler proportion is 1g/cm
3; MBR membrane module is the plate and frame flat sheet membrane of membrane pore size 0.25 μm, and nitrification liquid reflux reflux ratio is 250%, and the hydraulic detention time of acrylic nitrile waste water in anaerobic fixed film reactor, anoxic pond, MBR pond respectively is 16h, 10h, 10h.Anaerobic fixed film reactor volumetric loading is 5kgCOD/m
3d; MBR pool volume load is 2kgCOD/m
3d.Biochemical treatment system MBR pond water outlet adopts rolling nanofiltration membrane to carry out advanced treatment, and working temperature is normal temperature, and operating pressure is 2MPa, and gained is purified waste water standard discharge, and concentrated solution is partly refluxed to technique foremost.
The water-quality guideline that gained is purified waste water after the efficient treatment combination art breading of aforesaid propylene nitrile waste water is as follows: COD37.6mg/L, BOD
55.3mg/L, NH
3-N4.8mg/L, TN8.5mg/L, SS11mg/L, pH7.03, two poisonous and harmful characteristic contamination CN
-, vinyl cyanide (AN), DMF all do not detect.
embodiment 2.
Acrylic nitrile waste water efficient treatment combination technique catalyzed oxidation tower is intake the waste water produced after four-effect evaporation, stripping for acrylonitrile installation sewage, and its water-quality guideline is as follows: COD2395mg/L, NH
3-N45.3mg/L, TN306mg/L, pH7.36, CN
-7.60mg/L, vinyl cyanide (AN) 0.30mg/L, water temperature 70 DEG C.
The water-quality guideline of plant area's sanitary sewage is as follows: COD319mg/L, BOD
5160mg/L, NH
3-N25.2mg/L, SS159mg/L, pH7.28.
As shown in Figure 1, first Wastewater from Acrylonitrile Production enters catalyzed oxidation tower and carries out catalyzing hydrogen peroxide oxide treatment, and catalyzer is loaded catalyst, carrier S BA-16 mesopore molecular sieve, and active ingredient is MnO
2, catalyzed oxidation tower adopts fluidized-bed form, and hydraulic detention time is 45min.Enter biochemical treatment system after the water outlet of catalyzed oxidation tower and plant area sanitary sewage fully mix according to volumetric flow rate 1:6 ratio, arrange filler in biochemical treatment system anaerobic fixed film reactor and anoxic pond, packing ratio is 25%, and packing material size is 2cm, and specific surface area is 650m
2/ m
3, MBR membrane module is the flat sheet membrane of membrane pore size 0.25 μm, and nitrification liquid reflux reflux ratio is 200%, and the hydraulic detention time of acrylic nitrile waste water in anaerobic fixed film reactor, anoxic pond, MBR pond respectively is 12h, 10h, 8h.Anaerobic fixed film reactor volumetric loading is 4kgCOD/m
3d; MBR pool volume load is 3kgCOD/m
3d.Biochemical treatment system MBR pond water outlet adopts flat high frequency diaphragm (see application number: 201310690242.3 Chinese patent literatures) to carry out reverse osmosis advanced process, working temperature is normal temperature, operating pressure is 6MPa, gained Purified water re-use is in production equipment recirculated cooling water, and concentrated solution is partly refluxed to technique foremost.
The water-quality guideline that gained is purified waste water after the efficient treatment combination art breading of aforesaid propylene nitrile waste water is as follows: COD16.3mg/L, BOD
52.4mg/L, NH
3-N3.9mg/L, TN6.6mg/L, SS6mg/L, pH7.16, two poisonous and harmful characteristic contamination CN
-, vinyl cyanide (AN) all do not detect.
embodiment 3.
The efficient treatment combination technique catalyzed oxidation tower of acrylic nitrile waste water is intake the waste water produced after four-effect evaporation, stripping for acrylonitrile installation sewage, and its water-quality guideline is as follows: COD2037mg/L, NH
3-N46.8mg/L, TN325mg/L, pH7.33, CN-6.39mg/L, vinyl cyanide (AN) 0.30mg/L, water temperature 67 DEG C.
The water-quality guideline of plant area's sanitary sewage is as follows: COD320mg/L, BOD
5158mg/L, NH
3-N26.1mg/L, SS142mg/L, pH7.29.
As shown in Figure 1, first Wastewater from Acrylonitrile Production enters catalyzed oxidation tower and carries out catalyzing hydrogen peroxide oxide treatment, and catalyzer is loaded catalyst, carrier MCM-41 mesopore molecular sieve, active ingredient is Cu, and catalyzed oxidation tower adopts upflow fixed bed form, and hydraulic detention time is 120min.Enter biochemical treatment system after the water outlet of catalyzed oxidation tower and plant area sanitary sewage fully mix according to volumetric flow rate 1:4 ratio, arrange filler in biochemical treatment system anaerobic fixed film reactor and anoxic pond, packing ratio is 25%, and packing material size is 3cm, and specific surface area is 650m
2/ m
3, MBR membrane module is the hollow-fibre membrane of membrane pore size 0.30 μm, and nitrification liquid reflux reflux ratio is 300%, and the hydraulic detention time of acrylic nitrile waste water in anaerobic fixed film reactor, anoxic pond, MBR pond is respectively 16h, 8h, 8h.Anaerobic fixed film reactor volumetric loading is 8kgCOD/m
3d; MBR pool volume load is 2kgCOD/m
3d.Biochemical treatment system MBR pond water outlet adopts rolling nanofiltration membrane to carry out advanced treatment, and working temperature is normal temperature, and operating pressure is 2.5MPa, and gained is purified waste water standard discharge, and concentrated solution is partly refluxed to technique foremost.
The water-quality guideline that gained is purified waste water after the efficient treatment combination art breading of aforesaid propylene nitrile waste water is as follows: COD47.2mg/L, BOD
57.5mg/L, NH
3-N5.8mg/L, TN8.7mg/L, SS12mg/L, pH7.19, two poisonous and harmful characteristic contamination CN
-, vinyl cyanide (AN) all do not detect.
embodiment 4.
The efficient treatment combination technique catalyzed oxidation tower of acrylic nitrile waste water is intake the waste water produced after four-effect evaporation, stripping for acrylonitrile installation sewage, and its water-quality guideline is as follows: COD2171mg/L, NH
3-N42.3mg/L, TN322mg/L, pH7.37, CN
-7.24mg/L, vinyl cyanide (AN) 0.30mg/L, water temperature 68 DEG C.
The water-quality guideline of plant area's sanitary sewage is as follows: COD325mg/L, BOD
5154mg/L, NH
3-N26.2mg/L, SS148mg/L, pH7.18.
As shown in Figure 1, first Wastewater from Acrylonitrile Production enters catalyzed oxidation tower and carries out catalyzing hydrogen peroxide oxide treatment, and catalyzer is loaded catalyst, carrier MCM-41 mesopore molecular sieve, active ingredient is nano Ce O, and catalyzed oxidation tower adopts upflow fixed bed form, and hydraulic detention time is 90min.Enter biochemical treatment system after the water outlet of catalyzed oxidation tower and plant area sanitary sewage fully mix according to volumetric flow rate 1:6 ratio, arrange filler in biochemical treatment system anaerobic fixed film reactor and anoxic pond, packing ratio is 25%, and packing material size is 2cm, and specific surface area is 700m
2/ m
3, MBR membrane module is the hollow-fibre membrane of membrane pore size 0.25 μm, and nitrification liquid reflux reflux ratio is 250%, and the hydraulic detention time of acrylic nitrile waste water in anaerobic fixed film reactor, anoxic pond, MBR pond is respectively 10h, 6h, 8h.Anaerobic fixed film reactor volumetric loading is 7kgCOD/m
3d; MBR pool volume load is 1kgCOD/m
3d.Biochemical treatment system MBR pond water outlet adopts flat high frequency diaphragm (see application number: 201310690242.3 Chinese patent literatures) to carry out nanofiltration advanced treatment, working temperature is normal temperature, operating pressure is 3MPa, and gained is purified waste water standard discharge, and concentrated solution is partly refluxed to technique foremost.
The water-quality guideline that gained is purified waste water after the efficient treatment combination art breading of aforesaid propylene nitrile waste water is as follows: COD41.7mg/L, BOD
55.9mg/L, NH
3-N6.3mg/L, TN9.4mg/L, SS13mg/L, pH6.98, two poisonous and harmful characteristic contamination CN
-, vinyl cyanide (AN) all do not detect.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an efficient treatment combination technique for acrylic nitrile waste water, is characterized in that, comprise following processing step:
(1) Wastewater from Acrylonitrile Production enters catalyzed oxidation tower and carries out catalyzing hydrogen peroxide oxide treatment;
(2) water outlet of catalyzed oxidation tower and plant area sanitary sewage enter biochemical treatment system after fully mixing; Described biochemical treatment system comprises anaerobic fixed film reactor, anoxic pond and MBR pond successively;
(3) biochemical treatment system effluent adopting membrane isolation technique carries out advanced treatment; Gained is purified waste water standard discharge; Concentrated solution is partly refluxed to step (1).
2. the efficient treatment combination technique of a kind of acrylic nitrile waste water as claimed in claim 1, is characterized in that: described Wastewater from Acrylonitrile Production is the waste water that acrylonitrile installation sewage produces after four-effect evaporation and stripping; Temperature is 50 ~ 80 DEG C; Hydraulic detention time in catalyzed oxidation tower is 30 ~ 120min.
3. the efficient treatment combination technique of a kind of acrylic nitrile waste water as claimed in claim 2, is characterized in that: described catalyzed oxidation tower is the one in fixed bed, fluidized-bed or moving-bed; The catalyzer that described catalyzing hydrogen peroxide oxide treatment adopts is loaded catalyst; Carrier is silicon-based mesoporous molecular sieve; Active ingredient is one or more the mixture in Cu, Mn, Co, Ni, Ce, La and metal oxide thereof.
4. the efficient treatment combination technique of a kind of acrylic nitrile waste water as claimed in claim 2, is characterized in that: the catalyzer that described catalyzing hydrogen peroxide oxide treatment adopts is loaded catalyst; Carrier is SBA-16 mesopore molecular sieve; Active ingredient is nano Ce O.
5. the efficient treatment combination technique of a kind of acrylic nitrile waste water as claimed in claim 3, is characterized in that: in described step (2), the water outlet of catalyzed oxidation tower and plant area's sanitary sewage volume flow proportion are 1:2 ~ 6.
6. the efficient treatment combination technique of a kind of acrylic nitrile waste water as claimed in claim 5, is characterized in that: arrange filler respectively in anaerobic fixed film reactor and anoxic pond in described step (2), packing ratio is 25 ~ 30%; Packing material size is 1 ~ 3cm; Specific surface area is not less than 600m
2/ m
3, filler proportion is 0.85 ~ 1.05g/cm
3.
7. the efficient treatment combination technique of a kind of acrylic nitrile waste water as claimed in claim 6, is characterized in that: in described step (2), the membrane module in MBR pond is plate and frame, spiral wound, circular pipe type, hollow fiber form or capillary type; Membrane pore size is 0.1 ~ 0.4 μm.
8. the efficient treatment combination technique of a kind of acrylic nitrile waste water as claimed in claim 7, is characterized in that: the hydraulic detention time of described Wastewater from Acrylonitrile Production in anaerobic fixed film reactor, anoxic pond and MBR pond is followed successively by 10 ~ 22h, 4 ~ 12h and 6 ~ 18h; Anaerobic fixed film reactor volumetric loading is 2 ~ 10kgCOD/m
3d; MBR pool volume load is 1 ~ 3kgCOD/m
3d.
9. the efficient treatment combination technique of a kind of acrylic nitrile waste water as claimed in claim 8, is characterized in that: the MBR pond of described biochemical treatment system is provided with nitrification liquid reflux; Nitrification liquid is back to anoxic pond feed-water end; Reflux ratio is 100 ~ 300%.
10. the efficient treatment combination technique of a kind of acrylic nitrile waste water as claimed in claim 9, is characterized in that: the membrane module that in described step (3), membrane separation technique adopts is nanofiltration membrane or reverse osmosis membrane; Working temperature is normal temperature to 50 DEG C, and operating pressure is 0.5 ~ 10MPa.
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| CN109422430A (en) * | 2017-09-04 | 2019-03-05 | 中国石油化工股份有限公司 | A kind of processing method of high organic nitrogen waste water |
| CN109603893A (en) * | 2018-12-10 | 2019-04-12 | 合肥学院 | A kind of preparation method of Cu, Sr doping SBA-16 mesopore molecular sieve |
| CN112811725A (en) * | 2020-12-31 | 2021-05-18 | 荣成碳纤维科技有限公司 | Treatment method of carbon fiber production wastewater |
| CN115745207A (en) * | 2021-09-01 | 2023-03-07 | 中国石油化工股份有限公司 | Pretreatment process for acrylonitrile refining wastewater |
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| CN109603893A (en) * | 2018-12-10 | 2019-04-12 | 合肥学院 | A kind of preparation method of Cu, Sr doping SBA-16 mesopore molecular sieve |
| CN112811725A (en) * | 2020-12-31 | 2021-05-18 | 荣成碳纤维科技有限公司 | Treatment method of carbon fiber production wastewater |
| CN115745207A (en) * | 2021-09-01 | 2023-03-07 | 中国石油化工股份有限公司 | Pretreatment process for acrylonitrile refining wastewater |
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