CN101531442B - Processing method of wastewater produced during process of using glycerol as raw material to produce epichlorohydrin and device thereof - Google Patents
Processing method of wastewater produced during process of using glycerol as raw material to produce epichlorohydrin and device thereof Download PDFInfo
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Abstract
The invention relates to a processing method of wastewater produced during a process of using glycerol as raw material to produce epichlorohydrin and a device thereof. According to differences of sodium chloride, water and glycerol molecular diameters, absorption material similar with the glycerol molecular diameter is adopted by the invention for absorbing glycerol; therefore, an absorption device can be reused, the wastewater containing sodium chloride can be used as chlorine alkali industrialized saline, and cleaning water containing the glycerol with low concentration can be discharged safely after being processed by a biological method. The wastewater processing device comprises a sewage treatment pool, a raw water pool, a brine pool and a cleaning water pool. Connecting pipelines are arranged between the raw water pool and the brine pool and between the cleaning water pool and the sewage treatment pool. The pipeline is provided with a constant flow pump, a control valve, an absorption column, a control system and a total organic carbon detection instrument. The control system controls the circulation absorption and the recoil of the absorption column. The processing method has the positive effects of reasonable processing method, simple step, systematic control, less equipment investment, low energy consumption and small occupied area and effectively solves the problem of processing organic wastewater produced during the production process of using the glycerol as the raw material to produce the epichlorohydrin.
Description
[technical field]
The present invention relates to chemical industry and with the technical field that chemical process is disposed of sewage, being specifically related to glycerine is the wastewater treatment method and the treatment unit thereof of raw material production epoxy chloropropane.
[background technology]
The energy is the material that modern society be unable to do without.In view of the rise and the fluctuation of oil price, and the huge consumption of petroleum resources, people are also exploring other energy actively when using oil, and biofuel is exactly one of them.Now, many in the world countries are all developing biofuel energetically.
Can produce a large amount of by-product glycerins in the production process of biofuel, this causes the glycerine surplus again, and the price of glycerine is slumped.In this case, it is the novel process of raw material production epoxy chloropropane that people have developed with glycerine, and still, this technology can produce a kind of high salinity (sodium-chlor), high chemical oxygen demand (COD) in process of production---based on the organic waste water of glycerine.Therefore, this organic waste water low cost, high efficiency processing are just become the key that can this technology successful Application.
At present, it is several that domestic and international treatment process to salt-containing organic wastewater mainly contains biological process, physico-chemical process and oxidation style etc.
Chinese patent CN1004695B discloses a kind of method that reclaims glycerine from brine waste, its step mainly comprises evaporation---contacts---separate and separate out salt---flash distillation go out amylalcohol---rectification under vacuum etc. with amylalcohol, this patent is called oneself the brine waste that produces when being particularly suitable for the process for producing epichlorohydrin resin, refining glycerine can be obtained, and solid sodium chloride can be obtained simultaneously.But the deficiency of this method is: complex process, energy consumption height, processing costs costliness.
Biological process is a kind of method of handling salt-containing organic wastewater of present widespread use.But, the high salt that contains can produce infringement and suppress to the biology of Waste Water Treatment, and destroys the settling property of mud, thereby causes ordinary activated sludge to be difficult to realize to containing effective processing of high-salt wastewater, make the anti-salt impact capacity of common sludge poor, processing efficiency is low.Chinese patent CN 101054232A discloses a kind of high-salt wastewater treatment process efficiently that contains, it is by forming aerobic particle mud and adopting certain startup operation method and activated sludge acclimatization mode in sequencing batch reactor, under the condition that does not add halophilic bacterium, make the microorganism in the active sludge in the reactor realize assembling growth, and form the coenosis that meets little ecology, thereby realize efficient processing that contains high-salt wastewater and the anti-salt impact capacity of improving treatment system itself.But its main drawback is: can not handle the waste water that saltness surpasses 30g/L.
Chinese patent CN 101066819 discloses a kind of combined treatment process of high density salt-containing organic wastewater, it comprises: 1. freezing pre-treatment---place freezing field freezing described waste water, temperature is 0～-30 ℃, treat that waste water is freezing and after certain solid-to-liquid ratio, take out ice sample, melt with the water purification flushing, treat that follow-up catalytic treatment is standby; 2. the ice sample thawing water is carried out photocatalytic degradation, control light-catalysed dosage, light application time and pH value parameter and control the processing operation.The advantage of this combined treatment process is, can be to the high density salt-containing organic wastewater, handle as the reluctant waste water of biological processes such as percolate, dye intermediate wastewater, remove most of salinity and organism in the waste water, reduce the photocatalysis treatment load, improve photocatalysis efficiency, chemical oxygen demand (COD) (COD) clearance can be improved more than 30%.But this method is not suitable for handling the big waste water of day output, and processing power is low, the energy consumption height.
Method of evaporating also can be used for containing the processing of high-salt wastewater, often can obtain the salt solid, but its energy consumption is bigger, and cost is too high.
[summary of the invention]
The objective of the invention is to overcome the deficiencies in the prior art, providing a kind of is the treatment process that contains organic high-salinity wastewater of raw material production epoxy chloropropane with glycerine; A further object of the present invention is the wastewater treatment equipment that provides described method to adopt.
With glycerine is the high salt that produces in the production process of raw material production epoxy chloropropane, the organic waste water of high chemical oxygen demand, its sodium chloride content is 200～260g/L, chemical oxygen demand (COD) (COD) content is 2400～4300mg/L, because the COD of the overwhelming majority is made of glycerine in this waste water, amounts to into glycerol content and is about 2.0～3.5g/L.Hence one can see that, though be waste water salinity height, the COD height that produces in the production process of raw material production epoxy chloropropane with glycerine, its component is simple, mainly is made of sodium-chlor, water and glycerine, is a kind of more special waste water.Therefore; can adopt the glycerine in charcoal absorption-method of reproduction absorption waste water; keep the sodium-chlor in the waste water simultaneously; make and contain high-salt wastewater and meet chlorine industry brinish standard; then, utilize this waste water that contains high salt, enter chlorine industry as raw material as sodium chloride solution; reach and both protect environment, the dual purpose of making rational use of resources again.
For achieving the above object, the technical scheme taked of the present invention is:
A kind of is the wastewater treatment method of raw material production epoxy chloropropane with glycerine, it is characterized in that, different according to sodium-chlor, water with the glycerol molecule diameter, employing has the adsorbents adsorb glycerine to the similar space of glycerol molecule diameter, sorbent material is arranged in the adsorption unit different, that can be used alternatingly, alternately adsorbs the glycerine in the waste water; Adsorbing adsorption unit after saturated, to feed the clear water recoil promptly renewable, reuses, and as the change salt solution of chlorine industry, the recoil water that will contain lower concentration glycerine is handled the back discharging by biological process with the waste water of sodium chloride-containing that removes glycerine.
Described sorbent material comprises gac and molecular sieve.
Described adsorption unit is the form of adsorption column.
A kind of is the wastewater treatment method of raw material production epoxy chloropropane with glycerine, it is characterized in that, may further comprise the steps:
(1) by constant flow pump the organic waste water in the former pond is injected first adsorption column;
(2) first adsorption columns are handled in the effusive brine waste inflow in the back brine tank and are stored, and are sent to subsequent processing then and use as changing salt solution;
(3) to the outlet pipe of brine tank, total organic carbon detector and Controlling System are housed at first adsorption column, second adsorption column, after the total organic carbon in the first adsorption column effluent liquid reaches set(ting)value, under the control of Controlling System, organic waste water does not reinject in first adsorption column;
(4) when the situation of step (3) occurred, distributed control system was made two-step reaction:
The first step, water in the clean water basin is drawn and is sent into by constant flow pump and carries out backwash in first adsorption column, effusive recoil water is sent into treatment tank and is handled, to the outlet pipe of treatment tank, total organic carbon detector and Controlling System are housed at first adsorption column, second adsorption column, when the total organic carbon in the recoil water is reduced to set(ting)value, backwash stops, and first adsorption column is waited for the injection of organic waste water next time;
Second step, to close in the first adsorption column water filling, constant flow pump will inject the organic waste water in the former pond second adsorption column, specifically handle same step (2);
(5) after the total organic carbon in the second adsorption column effluent liquid reaches set(ting)value, under the control of distributed control system, organic waste water does not reinject in second adsorption column;
(6) when the situation of (5) occurred, distributed control system was made two-step reaction, repeating step (4) the first step and the content in second step, but circulation is switched between first adsorption column and second adsorption column.
For achieving the above object, the technical scheme taked of the present invention is:
A kind of is the treatment unit of the waste water of raw material production epoxy chloropropane with glycerine, contains treatment tank, Controlling System and control valve, it is characterized in that, also comprises former pond, brine tank and clean water basin; Treatment tank, former pond, brine tank and clean water basin are arranged according to the order of sequence, between former pond and brine tank, be provided with connecting tube, end is provided with first constant flow pump in the near former pond of pipeline, the stage casing is provided with first adsorption column and second adsorption column that separately connects with two first control valves, is provided with first distributed control system and the first total organic carbon detector at water side to the pipeline of first adsorption column and second adsorption column on the pipeline of brine tank water side; Between clean water basin and treatment tank, be provided with connecting tube, on the pipeline of nearly clean water basin, be provided with second constant flow pump, the stage casing separately connects first adsorption column and second adsorption column by two second control valves, is provided with second distributed control system and the second total organic carbon detector at water side to the pipeline of first adsorption column and second adsorption column on the pipeline of treatment tank water side; The running of distributed control system control total organic carbon detector, constant flow pump and control valve.
In described first adsorption column and second adsorption column sorbent material is housed.
Described sorbent material comprises gac and molecular sieve.
Described distributed control system is the architecture computer network supervisory control system that comprises the network topology of dual bus, annular or dual star, comprises total organic carbon on-line detector, operation-interface, computer monitoring online data system and computer control valve system.
Described total organic carbon detector is online total organic carbon detector, is controlled by distributed control system.
Described connecting tube adopts the salt tolerant pipeline, comprises stainless steel, pvc pipe road.
The present invention is that the wastewater treatment method of raw material production epoxy chloropropane and the positively effect of treatment unit thereof are with glycerine:
(1) method is reasonable, step is succinct, realized under distributed control system control, detect with the total organic carbon detector, adsorption column can reuse through absorption and backwash, organic waste water after the absorption can be used for chlorine industry, but discharge after the waste water biodegrade after the backwash, both effectively utilized resource, can not produce secondary pollution again.
(2) facility investment is few, and energy consumption is low, and floor space is little, and secondary wastewater can be effectively addressed.
(3) having solved effectively is the high salinity that produces in process of production of the technology of raw material production epoxy chloropropane, the organic waste water of high COD with glycerine, and it is low to satisfy processing cost, efficient height, the requirement good to the level of resources utilization.
[description of drawings]
Accompanying drawing 1 the present invention is the structural representation of treatment unit of the waste water of raw material production epoxy chloropropane with glycerine;
Accompanying drawing 2 is for being the glycerine adsorption test of sorbent material with the gac.
Label shown in the figure is respectively:
1, treatment tank, 2, former pond, 3, brine tank,
4, clean water basin, 5, first distributed control system, 52, second distributed control system,
6, the first total organic carbon detector, 62, the second total organic carbon detector, 7, first adsorption column,
8, second adsorption column, 9, first constant flow pump, 92, second constant flow pump,
10, first control valve, 102, second control valve.
[embodiment]
Below provide the specific embodiment of the present invention by accompanying drawing, still, the invention is not restricted to following embodiment.
The present invention with glycerine be the raw material production epoxy chloropropane wastewater treatment method to the effect that: (1) according to the difference of sodium-chlor, water and glycerol molecule diameter, adopts the sorbing material absorption glycerine similar to the glycerol molecule diameter; (2) the glycerine adsorption unit can use repeatedly; (3) removing the waste water of the sodium chloride-containing behind the glycerine can be as the change salt solution of chlorine industry; (4) rinse water that contains lower concentration glycerine of by-product can be handled the back safety dumping with biological process.
Referring to accompanying drawing 1.
The a kind of of the method according to this invention design is the treatment unit of the waste water of raw material production epoxy chloropropane with glycerine, contain treatment tank 1, former pond 2, brine tank 3, clean water basin 4, Controlling System and control valve 10, treatment tank 1, former pond 2, brine tank 3 and clean water basin 4 are arranged according to the order of sequence, it is the waste water of raw material production epoxy chloropropane that former pond 2 is used to store with glycerine, brine tank 3 is used to store the waste water that removes the sodium chloride-containing behind the glycerine, clean water basin 4 are used to store the water that is used to recoil of cleaning, treatment tank 1 is used to store the secondary wastewater that contains lower concentration glycerine after the recoil, and the scale in each pond can be determined by the processing power of design or adjust.Its engineering can be built by the national environmental protection engineering specification.
Between former pond 2 and brine tank 3 connecting tube is set, connecting tube adopts the salt tolerant pipeline, comprises stainless steel, pvc pipe road; 2 ends are provided with first constant flow pump 9 in the near former pond of pipeline, constant flow pump adopts peristaltic pump, first adsorption column 7 and second adsorption column 8 that separately connects with two first control valves 10 is set in the pipeline stage casing, control valve adopts the pneumatic piston control valve, at water side to the pipeline of first adsorption column 7 and second adsorption column 8 first distributed control system 5 and the first total organic carbon detector 6 is set on the pipeline of brine tank 3 water sides.
Connecting tube (connecting tube adopts the stainless steel pipes and/or the pvc pipe road of salt tolerant equally) is set between clean water basin 4 and treatment tank 1, second constant flow pump 92 (with first constant flow pump 9) is set on the pipeline of nearly clean water basin 4, the stage casing separately connects first adsorption column 7 and second adsorption column 8 by two second control valves 102, at water side to the pipeline of first adsorption column 7 and second adsorption column 8 second distributed control system 52 and the second total organic carbon detector 62 is set on the pipeline of treatment tank 1 water side.
The distributed control system system of this treatment unit comprises the architecture computer network supervisory control system of the network topology of dual bus, annular or dual star, comprises total organic carbon on-line detector, operation-interface, computer monitoring online data system and computer control valve system.The running of distributed control system control total organic carbon detector (being online total organic carbon detector), constant flow pump and control valve.
Above-mentioned adsorption column is that stainless steel constitutes part, and sorbent material is housed in the adsorption column, and the material of sorbent material comprises gac and molecular sieve.
The base conditioning step of treatment unit that with glycerine is the waste water of raw material production epoxy chloropropane is:
(1) by first constant flow pump 9 organic waste water in the former pond 2 is injected first adsorption column 7;
(2) first adsorption columns 7 are handled the effusive brine waste in back and are flowed into storage in the brine tank 3, are sent to subsequent processing then and use as changing salt solution;
(3) record after total organic carbon in first adsorption column, 7 effluent liquid reaches set(ting)value when first distributed control system 5 and the first total organic carbon detector 6, stop to 7 water fillings of first adsorption column;
(4) when the situation of step (3) occurs, first distributed control system 5 is made two-step reaction:
The first step, starting second constant flow pump 92 injects first adsorption column 7 with the water in the clean water basin 4 and carries out backwash, effusive rinse water is sent into treatment tank 1, when second distributed control system 52 and the second total organic carbon detector 62 record total organic carbon in the rinse water and are reduced to set(ting)value, backwash stops, and first adsorption column 7 is waited for the injection of organic waste water next time;
Second step when closing first control valve 10 that connects first adsorption column 7, started first control valve 10 that connects second adsorption column 8, by first constant flow pump 9 organic waste water in the former pond 2 was injected second adsorption column 8, specifically handled same step (2);
(5) after the total organic carbon in second adsorption column, 8 effluent liquid reaches set(ting)value, under the control of distributed control system, organic waste water does not reinject in second adsorption column 8;
(6) when the situation of (5) occurred, distributed control system was made two-step reaction, repeating step (4) the first step and the content in second step, but circulation is switched between first adsorption column 7 and second adsorption column 8.
The concrete data of implementing
The situation that adopts aforesaid method and related device to implement is:
Glycerol concentration is 2.2g/L in the stoste, and sodium chloride concentration 250g/L injects first adsorption column 7 with the constant flow velocity with stoste with first constant flow pump 9, and the detected glycerol concentration of effluent liquid is 0 during beginning, and sodium chloride concentration is 200g/L; Along with the increase of time, glycerol concentration raises gradually, and sodium chloride concentration is stabilized in 250g/L.5.3 after hour, the detected glycerol concentration of effluent liquid is 1.43g/L, stoste is sent into termination.Meanwhile, open second constant flow pump 92, inject clear water in first adsorption column 7, recoil, flow rate control is the twice of former flow velocity, and the recoil time is 1 hour, and the water outlet of recoil is sent to treatment tank 1 and is stored pending.
When closing the injection of first adsorption column, 7 stostes, open the inlet valve of second adsorption column 8, operational condition is identical with the operation of first adsorption column 7, when the detected glycerol concentration of effluent liquid is 1.43g/L, stoste is sent into termination, switches to first adsorption column 7, this moment, the regeneration of first adsorption column 7 was finished, realized the recycle of first adsorption column 7 and second adsorption column 8, the glycerine clearance is about 43.82%
By accompanying drawing 2 as seen, glycerol concentration reaches between 0.8～1 in the 8th times of column volume.
Because adsorption process of the present invention belongs to physical adsorption, therefore desorption is also than being easier to, adsorb the sorbent material after saturated as long as feed clear water promptly renewable (referring to table 1), the reuse water that only contains lower concentration glycerine can be handled back up to standard discharging by simple biological process, and the waste water that removes the sodium chloride-containing of glycerine then enters chlorine industry as changing salt solution.
Show the glycerine clearance and the absorption quality of 1-18 clear water desorption experiment
Claims (10)
1. one kind is the wastewater treatment method of raw material production epoxy chloropropane with glycerine, it is characterized in that, different according to sodium-chlor, water with the glycerol molecule diameter, employing has the adsorbents adsorb glycerine to the similar space of glycerol molecule diameter, sorbent material is arranged in the adsorption unit different, that can be used alternatingly, alternately adsorbs the glycerine in the waste water; Adsorb adsorption unit after saturated and feed clear water and recoil, the regeneration back is reused, and as the change salt solution of chlorine industry, the recoil water that will contain lower concentration glycerine is handled the back discharging through biological process with the waste water of sodium chloride-containing that removes glycerine.
2. according to claim 1 is the wastewater treatment method of raw material production epoxy chloropropane with glycerine, it is characterized in that described sorbent material comprises gac and molecular sieve.
3. according to claim 1 is the wastewater treatment method of raw material production epoxy chloropropane with glycerine, it is characterized in that, described adsorption unit is an adsorption column.
4. according to claim 1 is the wastewater treatment method of raw material production epoxy chloropropane with glycerine, it is characterized in that, may further comprise the steps:
(1) by constant flow pump the organic waste water in the former pond is injected first adsorption column;
(2) first adsorption columns are handled in the effusive brine waste inflow in the back brine tank and are stored, and are sent to subsequent processing then and use as changing salt solution;
(3) to the outlet pipe of brine tank, total organic carbon detector and distributed control system are housed at first adsorption column, second adsorption column, after the total organic carbon in the first adsorption column effluent liquid reaches set(ting)value, under the control of distributed control system, organic waste water does not reinject in first adsorption column;
(4) when the situation of step (3) occurred, distributed control system was made two-step reaction:
The first step, water in the clean water basin is drawn and is sent into by constant flow pump and carries out backwash in first adsorption column, effusive recoil water is sent into treatment tank and is handled, to the outlet pipe of treatment tank, total organic carbon detector and Controlling System are housed at first adsorption column, second adsorption column, when the total organic carbon in the recoil water is reduced to set(ting)value, backwash stops, and first adsorption column is waited for the injection of organic waste water next time;
Second step, to close in the first adsorption column water filling, constant flow pump will inject the organic waste water in the former pond second adsorption column, specifically handle same step (2);
(5) after the total organic carbon in the second adsorption column effluent liquid reaches set(ting)value, under the control of distributed control system, organic waste water does not reinject in second adsorption column;
(6) when the situation of (5) occurred, distributed control system was made two-step reaction, repeating step (4) the first step and the content in second step, but circulation is switched between first adsorption column and second adsorption column.
5. one kind is the treatment unit of the waste water of raw material production epoxy chloropropane with glycerine, contains treatment tank, Controlling System and control valve, it is characterized in that, also comprises former pond, brine tank and clean water basin; Treatment tank, former pond, brine tank and clean water basin are arranged according to the order of sequence, between former pond and brine tank, be provided with connecting tube, end is provided with first constant flow pump in the near former pond of pipeline, the stage casing is provided with first adsorption column and second adsorption column that separately connects with two first control valves, is provided with first distributed control system and the first total organic carbon detector in the water side of first adsorption column and second adsorption column to the pipeline of brine tank water side; Between clean water basin and treatment tank, be provided with connecting tube, on the pipeline of nearly clean water basin, be provided with second constant flow pump, the stage casing separately connects first adsorption column and second adsorption column by two second control valves, is provided with second distributed control system and the second total organic carbon detector in the water side of first adsorption column and second adsorption column to the pipeline of treatment tank water side; The running of distributed control system control total organic carbon detector, constant flow pump and control valve.
6. according to claim 5 is the treatment unit of the waste water of raw material production epoxy chloropropane with glycerine, it is characterized in that, in described first adsorption column and second adsorption column sorbent material is housed.
7. according to claim 6 is the treatment unit of the waste water of raw material production epoxy chloropropane with glycerine, it is characterized in that described sorbent material comprises gac and molecular sieve.
8. according to claim 5 is the treatment unit of the waste water of raw material production epoxy chloropropane with glycerine, it is characterized in that, described distributed control system is the architecture computer network supervisory control system that comprises the network topology of dual bus, annular or dual star, comprises total organic carbon on-line detector, operation-interface, computer monitoring online data system and computer control valve system.
9. according to claim 5 is the treatment unit of the waste water of raw material production epoxy chloropropane with glycerine, it is characterized in that, described total organic carbon detector is online total organic carbon detector, is controlled by distributed control system.
10. according to claim 5 is the treatment unit of the waste water of raw material production epoxy chloropropane with glycerine, it is characterized in that, described connecting tube adopts the salt tolerant pipeline, comprises stainless steel, the pvc pipe road.
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| CN2009100464170A CN101531442B (en) | 2009-02-20 | 2009-02-20 | Processing method of wastewater produced during process of using glycerol as raw material to produce epichlorohydrin and device thereof |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102153230B (en) * | 2011-02-28 | 2012-08-22 | 上海化学工业区中法水务发展有限公司 | Method and device for treating salt-containing wastewater produced during producing epoxy chloropropane by using glycerol as raw material |
| CN103073086B (en) * | 2013-01-18 | 2013-12-11 | 上海化学工业区中法水务发展有限公司 | Method for adsorbing glycerol contained in wastewater by using resin treated by boric acid |
| CN104230659B (en) * | 2014-08-21 | 2015-10-07 | 波鹰(厦门)科技有限公司 | A kind of high salt contains the recovery method of sodium-chlor and glycerine in glycerine high concentrated organic wastewater |
| CN104230046B (en) * | 2014-08-21 | 2015-09-30 | 波鹰(厦门)科技有限公司 | A kind of high salt contains the tripping device of sodium-chlor and glycerine in glycerine high concentrated organic wastewater |
| CN104230084B (en) * | 2014-08-21 | 2015-08-19 | 波鹰(厦门)科技有限公司 | High salt contains the retrieving arrangement of sodium-chlor and glycerine in glycerine high concentrated organic wastewater |
| CN104230082B (en) * | 2014-08-21 | 2015-08-19 | 波鹰(厦门)科技有限公司 | A kind of high salt contains the retrieving arrangement of sodium-chlor and glycerine in glycerine high concentrated organic wastewater |
| CN104230083B (en) * | 2014-08-21 | 2015-08-05 | 波鹰(厦门)科技有限公司 | High salt contains the recovery method of sodium-chlor and glycerine in glycerine high concentrated organic wastewater |
| CN104291523A (en) * | 2014-09-18 | 2015-01-21 | 波鹰(厦门)科技有限公司 | Method for recovering sodium chloride and glycerin from glycerin-containing high-salinity organic wastewater |
| CN104355470B (en) * | 2014-10-11 | 2016-01-06 | 波鹰(厦门)科技有限公司 | The retrieving arrangement of glycerine in highly salt containing organic waste water |
| CN104609629B (en) * | 2014-12-30 | 2017-02-22 | 中国天辰工程有限公司 | Method for treating glycerin-based epoxy chloropropane saponification wastewater |
| TWI547470B (en) | 2015-12-18 | 2016-09-01 | 長春人造樹脂廠股份有限公司 | Process for Preparing Dichloropropanol |
| CN106007092A (en) * | 2016-07-15 | 2016-10-12 | 郑巧丹 | Method for recycling epoxy chloropropane in epoxy chloropropane wastewater and treating wastewater |
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