CN112661337A - Recycling pretreatment method and treatment device for waste water of ethylene production - Google Patents
Recycling pretreatment method and treatment device for waste water of ethylene production Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 64
- 238000004064 recycling Methods 0.000 title claims abstract description 37
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 239000005977 Ethylene Substances 0.000 title claims abstract description 23
- 238000002203 pretreatment Methods 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 238000000909 electrodialysis Methods 0.000 claims abstract description 170
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 80
- 239000000243 solution Substances 0.000 claims abstract description 46
- 238000001704 evaporation Methods 0.000 claims abstract description 42
- 230000008020 evaporation Effects 0.000 claims abstract description 41
- 239000011780 sodium chloride Substances 0.000 claims abstract description 39
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 239000012267 brine Substances 0.000 claims abstract description 14
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 13
- 238000011033 desalting Methods 0.000 claims abstract description 12
- 238000003825 pressing Methods 0.000 claims abstract description 11
- 230000018044 dehydration Effects 0.000 claims abstract description 7
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 7
- 239000002274 desiccant Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- UDPGUMQDCGORJQ-UHFFFAOYSA-N (2-chloroethyl)phosphonic acid Chemical compound OP(O)(=O)CCCl UDPGUMQDCGORJQ-UHFFFAOYSA-N 0.000 claims description 27
- 239000005976 Ethephon Substances 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 14
- 238000010612 desalination reaction Methods 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 8
- 239000000047 product Substances 0.000 description 9
- 150000003839 salts Chemical class 0.000 description 7
- 239000002699 waste material Substances 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 238000005185 salting out Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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Abstract
The invention discloses a recycling pretreatment method and a treatment device for waste water of ethylene, wherein the waste water of ethylene is subjected to first-stage electrodialysis treatment by using a first-stage electrodialysis module to obtain first-stage electrodialysis concentrated solution and first-stage electrodialysis desalted solution; feeding the first-stage electrodialysis concentrated solution into the triple-effect evaporation unit for treatment to obtain sodium chloride strong brine, feeding the obtained sodium chloride strong brine into the filter press for filter pressing and dehydration to obtain a wet sodium chloride product, and drying the wet sodium chloride product by using the drying agent; performing secondary electrodialysis treatment on the primary electrodialysis desalted liquid by using the secondary electrodialysis module to obtain a secondary electrodialysis concentrated liquid and a secondary electrodialysis desalted liquid; and (3) delivering the second-stage electrodialysis concentrated solution into a desalting tank in the first-stage electrodialysis module for treatment, and delivering the second-stage electrodialysis desalted solution into a wastewater station for treatment, so as to realize the treatment of recycling the waste water of the ethylene.
Description
Technical Field
The invention relates to the technical field of ethephon waste water treatment, in particular to a recycling pretreatment method and a treatment device for ethephon waste water.
Background
Ethephon of the chemical formula C2H6ClO3P has molecular weight of 144.50, is an organic compound, pure white needle crystal, light brown liquid, is easily soluble in water, methanol, acetone, ethylene glycol, and propylene glycol, is slightly soluble in toluene, and is insoluble in petroleum ether. Used as an agricultural plant growth stimulant. In the current production process, the content of sodium chloride salt in high-salinity wastewater generated in the ethephon production process is about 1-1.2%, and the COD is about 2500-.
The current industry mainly comprises the following treatment modes aiming at ethephon waste water: ozone catalytic oxidation: the ethephon waste water is directly treated by ozone and a catalyst to remove organic matters in the ethephon waste water, but because the ozone catalytic oxidation can only reduce COD and basically has no effect on the salinity of the ethephon waste water, the ethephon waste water can be treated after being diluted, so that the treatment cost is higher; a distillation method: the MVR is used for distilling and separating organic matters and salt, the distillate enters a biochemical treatment system, and the distilled mother liquor can be used for incineration treatment; an electrolytic method: COD is decomposed through direct current, organic matters are decomposed, and the treated wastewater enters a dilution discharge port or a biochemical system, but the method only has little effect on salt action due to organic matter degradation, and the method is not recycled; film treatment method: the ethephon waste water is treated by the ultrafiltration reverse osmosis membrane system, the effluent directly reaches the discharge standard, and the concentrated solution is incinerated or buried after being subjected to MVR or multi-effect evaporation treatment, but the concentrated solution generated by the method is dangerous solid waste, the evaporation energy consumption is high, and the membrane treatment cost is high. Therefore, it is necessary to provide a method for recycling ethephon waste water.
Disclosure of Invention
The invention aims to provide a recycling pretreatment method and a recycling treatment device for waste ethephon water, and aims to solve the technical problem that waste ethephon water cannot be recycled in the prior art.
In order to achieve the purpose, the recycling treatment device for the waste water of the ethephon comprises a direct-current power supply, a first-stage electrodialysis module, a second-stage electrodialysis module, two water distributors, a centrifugal pump, a triple-effect evaporation unit, a filter press and a dryer, wherein the number of the two water distributors is two, the two water distributors are respectively arranged on the first-stage electrodialysis module and the second-stage electrodialysis module, the first-stage electrodialysis module is respectively connected with the second-stage electrodialysis module, the centrifugal pump and the triple-effect evaporation unit, and the filter press is respectively connected with the triple-effect evaporation unit, the first-stage electrodialysis module and the dryer;
the one-stage electrodialysis module with the second-stage electrodialysis module comprises anode chamber, cathode chamber, a plurality of desalination ponds and a plurality of concentrated pond, the one-stage electrodialysis module with the second-stage electrodialysis module the anode chamber all with DC power supply's anodal is connected, the one-stage electrodialysis module with the second-stage electrodialysis module the cathode chamber all with DC power supply's negative pole is connected.
The invention also provides a recycling pretreatment method for the waste water of ethylene by adopting the recycling treatment device for the waste water of ethylene, which comprises the following steps:
performing primary electrodialysis treatment on the ethephon wastewater by using the primary electrodialysis module to obtain a primary electrodialysis concentrated solution and a primary electrodialysis desalted solution;
feeding the first-stage electrodialysis concentrated solution into the triple-effect evaporation unit for treatment to obtain sodium chloride strong brine, feeding the obtained sodium chloride strong brine into the filter press for filter pressing and dehydration to obtain a wet sodium chloride product, and drying the wet sodium chloride product by using the drying agent;
performing secondary electrodialysis treatment on the primary electrodialysis desalted liquid by using the secondary electrodialysis module to obtain a secondary electrodialysis concentrated liquid and a secondary electrodialysis desalted liquid;
and feeding the second-stage electrodialysis concentrated solution into a desalting tank in the first-stage electrodialysis module for treatment, and feeding the second-stage electrodialysis desalted solution into a wastewater station for treatment.
Wherein, in the step of using the first-stage electrodialysis module to carry out first-stage electrodialysis treatment on the ethephon waste water: the operating voltage of the first-stage electrodialysis module is 10-13V, the operating current is 1-1.2A, and the operating temperature is controlled to be less than 28 ℃.
Wherein, in the step of sending the first-stage electrodialysis concentrated solution into the triple-effect evaporation unit for treatment: the triple effect evaporation unit controls the pressure of the evaporation process to be-0.09 Mpa to-0.2 Mpa, and the evaporation temperature is 80 ℃.
Wherein, in the step of sending the first-stage electrodialysis concentrated solution into the triple-effect evaporation unit for treatment: the filter pressing pressure of the filter press is 0.4 MPa-0.6 MPa.
Wherein, in the step of sending the first-stage electrodialysis concentrated solution into the triple-effect evaporation unit for treatment: the dryer is a single-channel dryer, the drying temperature is 80-100 ℃, and the drying time is 2-5 h.
Wherein, in the step of using the secondary electrodialysis module to carry out secondary electrodialysis treatment on the primary electrodialysis desalted liquid: the operating voltage of the secondary electrodialysis module is 10-13V, the operating current is 1-1.2A, and the operating temperature is controlled to be less than 28 ℃.
The invention has the beneficial effects that: performing first-stage electrodialysis treatment on the ethephon wastewater by using the first-stage electrodialysis module to obtain first-stage electrodialysis concentrated solution and first-stage electrodialysis desalted solution; feeding the first-stage electrodialysis concentrated solution into the triple-effect evaporation unit for treatment to obtain sodium chloride strong brine, feeding the obtained sodium chloride strong brine into the filter press for filter pressing and dehydration to obtain a wet sodium chloride product, and drying the wet sodium chloride product by using the drying agent; performing secondary electrodialysis treatment on the primary electrodialysis desalted liquid by using the secondary electrodialysis module to obtain a secondary electrodialysis concentrated liquid and a secondary electrodialysis desalted liquid; sending second-stage electrodialysis concentrated solution into a desalting tank in a first-stage electrodialysis module for treatment, sending second-stage electrodialysis desalted solution into a wastewater station for treatment, effectively removing salt in the waste water of the vinyl alcohol, recycling sodium chloride, realizing efficient treatment of the waste water of the vinyl alcohol during recycling, realizing direct standard discharge of the treated waste water, realizing comprehensive treatment cost forward income, and realizing the treatment of recycling the waste water of the vinyl alcohol.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of the steps of the recycling pretreatment method of waste water from waste ethylene production.
FIG. 2 is a process flow diagram of the recycling pretreatment method of waste water from recycling of ethylene production.
FIG. 3 is a schematic structural diagram of the recycling pretreatment device for waste water of ethylene production of the present invention.
The device comprises a direct current power supply 1, a primary electrodialysis module 2, a secondary electrodialysis module 3, a water distributor 4, a centrifugal pump 5, a triple-effect evaporation unit 6, a filter press 7, a dryer 8, an anode chamber 9, a cathode chamber 10, a desalination tank 11, a concentration tank 12, a heat exchanger 13, a single-effect separator 14, a double-effect separator 15 and a triple-effect separator 16.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1 to 3, the invention provides a recycling treatment device for waste water from recycling of ethephon, which includes a direct current power supply 1, a first-stage electrodialysis module 2, a second-stage electrodialysis module 3, water distributors 4, a centrifugal pump 5, a triple-effect evaporation unit 6, a filter press 7 and a dryer 8, wherein the number of the water distributors 4 is two, the two water distributors 4 are respectively arranged on the first-stage electrodialysis module 2 and the second-stage electrodialysis module 3, the first-stage electrodialysis module 2 is respectively connected with the second-stage electrodialysis module 3, the centrifugal pump 5 and the triple-effect evaporation unit 6, and the filter press 7 is respectively connected with the triple-effect evaporation unit 6, and the first-stage electrodialysis module 2 and the dryer 8;
the one-stage electrodialysis module 2 with the second-stage electrodialysis module 3 comprises anode chamber 9, cathode chamber 10, a plurality of desalination pools 11 and a plurality of concentration pools 12, the one-stage electrodialysis module 2 with the second-stage electrodialysis module 3 the anode chamber 9 all with DC power supply 1's positive pole is connected, the one-stage electrodialysis module 2 with the second-stage electrodialysis module 3 the cathode chamber 10 all with DC power supply 1's negative pole is connected.
The triple-effect evaporation unit 6 comprises three heat exchangers 13, a first-effect separator 14, a second-effect separator 15 and a triple-effect separator 16, the heat exchangers 13 are arranged between every two adjacent heat exchangers 13, the first heat exchanger 13 is respectively connected with the centrifugal pump 5 and the first-effect separator 14 from left to right, the second heat exchanger 13 is respectively connected with the first-effect separator 14 and the second-effect separator 15, the third heat exchanger 13 is respectively connected with the second-effect separator 15 and the triple-effect separator 16, and the triple-effect separator 16 is connected with the pressure filter.
The desalting cells 11 and the concentration cells 12 in the first-stage electrodialysis module 2 are arranged at intervals, and the desalting cells 11 and the concentration cells 12 in the second-stage electrodialysis module 3 are arranged at intervals.
In the embodiment, the first-stage electrodialysis module 2 is used for carrying out first-stage electrodialysis treatment on the ethephon wastewater to obtain first-stage electrodialysis concentrated solution and first-stage electrodialysis desalted solution; feeding the first-stage electrodialysis concentrated solution into the triple-effect evaporation unit 6 for treatment to obtain sodium chloride strong brine, feeding the obtained sodium chloride strong brine into the filter press 7 for filter pressing and dehydration to obtain a wet sodium chloride product, and drying the wet sodium chloride product by using the drying agent; performing secondary electrodialysis treatment on the primary electrodialysis desalted liquid by using the secondary electrodialysis module 3 to obtain a secondary electrodialysis concentrated liquid and a secondary electrodialysis desalted liquid; send into second grade electrodialysis concentrate desalination pond 11 in the one-level electrodialysis module 2 is handled, send into waste water station with second grade electrodialysis desalination liquid and handle, through this processing apparatus's structural design, can effectively get rid of the salinity in the ethylene waste water to can resource recycle sodium chloride, realize the high-efficient processing of ethylene waste water in the time of recycle, direct discharge to reach standard is realized to the waste water after handling, realize synthesizing the forward income of cost of dealing with, realize the processing to ethylene waste water resourceful.
The invention also provides a recycling pretreatment method of the waste water of ethylene by using the recycling treatment device of the waste water of ethylene, which comprises the following steps:
s1: performing primary electrodialysis treatment on the ethephon wastewater by using the primary electrodialysis module 2 to obtain a primary electrodialysis concentrated solution and a primary electrodialysis desalted solution;
s2: feeding the first-stage electrodialysis concentrated solution into the triple-effect evaporation unit 6 for treatment to obtain sodium chloride strong brine, feeding the obtained sodium chloride strong brine into the filter press 7 for filter pressing and dehydration to obtain a wet sodium chloride product, and drying the wet sodium chloride product by using the drying agent;
s3: performing secondary electrodialysis treatment on the primary electrodialysis desalted liquid by using the secondary electrodialysis module 3 to obtain a secondary electrodialysis concentrated liquid and a secondary electrodialysis desalted liquid;
s4: and (3) delivering the second-stage electrodialysis concentrated solution into a desalting tank 11 in the first-stage electrodialysis module 2 for treatment, and delivering the second-stage electrodialysis desalted solution into a wastewater station for treatment.
In the embodiment, the first-stage electrodialysis module 2 is used for carrying out first-stage electrodialysis treatment on the ethephon wastewater, the operating voltage of the first-stage electrodialysis module 2 is controlled to be 10V-13V, the operating current is controlled to be 1A-1.2A, the operating temperature is controlled to be less than 28 ℃, and the inlet water of the desalting tank 11 of the first-stage electrodialysis module 2 consists of ethephon raw water (the content of sodium chloride salt is about 1-1.2%, the COD is about 2500-; the water inlet amount of the first-stage electrodialysis concentration tank 12 is one fifth of that of the desalination tank 11, and the first-stage electrodialysis concentration tank consists of triple-effect evaporation condensed water and tap water; the salt content of the first-stage electrodialysis concentrated solution after first-stage electrodialysis is 10%, the COD is 50-100mg/L, the generation amount of the concentrated solution is about 15% of the original water amount, and the treated first-stage electrodialysis concentrated solution enters a triple-effect evaporation system for treatment; the production amount of the primary electrodialysis desalination liquid (the content of sodium chloride is about 0.5 percent, and the COD is about 2500-;
sending the first-stage electrodialysis desalted water into the second-stage electrodialysis module 3 for second-stage electrodialysis treatment, controlling the operating voltage of the second-stage electrodialysis module 3 to be 10-13V, the operating current to be 1-1.2A, controlling the operating temperature to be less than 28 ℃, the inlet water of the desalting tank 11 of the secondary electrodialysis module 3 forms primary electrodialysis desalted water (the content of sodium chloride is about 0.5%, and COD is about 2500-, the water inflow of the desalting cell 11 of the secondary electrodialysis module 3 is one fifth of the water in the desalting cell 11 of the secondary electrodialysis module 3, the composition of the system consists of triple-effect evaporation condensed water, the salt content of a secondary electrodialysis concentrated solution after secondary electrodialysis is 1-1.5%, the COD (chemical oxygen demand) is 10-50mg/L, the generation amount of a concentrated solution is about 15% of the original water amount, and the treated secondary electrodialysis concentrated solution enters the desalting tank 11 of the primary electrodialysis module 2; the production amount of the secondary electrodialysis desalination liquid (the content of sodium chloride is about 0.25%, COD is about 2500-;
in the process of concentrating the primary electrodialysis concentrated solution and carrying out triple effect evaporation treatment, the pressure in the evaporation process is controlled to be-0.09 Mpa to-0.2 Mpa, the evaporation temperature is 80 ℃, the generated condensate is cooled to below 25 ℃ and then is supplemented with the concentrated solution for the electrodialysis device, the generated sodium chloride concentrated brine (the water content is about 95 percent and the sodium chloride content is about 5 percent) enters the filter press 7 for dehydration, and the triple effect evaporation condensate enters the concentration tanks 12 of the primary electrodialysis module 2 and the secondary electrodialysis module 3; the concentrated solution of the triple-effect evaporation unit 6 is continuously recycled, no wastewater is generated in the step, the process belongs to a clean production flow, and the disposal cost can be obviously reduced; and (2) allowing the sodium chloride concentrated brine generated by triple effect evaporation to enter a filter press 7 for filter pressing, wherein the filter pressing pressure is 0.4-0.6 Mpa, allowing the waste liquid generated by filter pressing to enter a triple effect evaporation unit 6, and allowing the generated sodium chloride wet product (with the water content of 3% and the sodium chloride content of about 97%) to enter a single-channel dryer, wherein the drying temperature is 80-100 ℃, and the drying time is about 2-5 hours. The content of the dried sodium chloride reaches more than 99 percent and far exceeds the requirement of sodium chloride by-product. Wherein, pure high-salt water is obtained through two-stage electrodialysis desalination, low-cost salt concentration is realized, the salinity is concentrated to 15 percent, and the salinity of the generated low-salt water can directly accord with the receiving range of a biochemical system; directly preparing sodium chloride by-products with the content of more than 99% by evaporating, salting out and drying, realizing resource utilization, and recycling the condensate to the electrodialysis step to finish the non-waste clean treatment process;
in summary, the following steps: according to the technical scheme, the salt in the waste water of the ethephon can be effectively removed, the sodium chloride can be recycled, the high-efficiency treatment of the waste water of the ethephon is realized while the sodium chloride is recycled, the treated waste water is directly discharged up to the standard, the forward income of comprehensive treatment cost is realized, and the recycling treatment of the waste water of the ethephon is realized.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A recycling treatment device for waste water of ethylene production, which is characterized in that,
the water distributor comprises a direct-current power supply, a primary electrodialysis module, a secondary electrodialysis module, water distributors, a centrifugal pump, a three-effect evaporation unit, a filter press and a dryer, wherein the number of the water distributors is two, the two water distributors are respectively arranged on the primary electrodialysis module and the secondary electrodialysis module, the primary electrodialysis module is respectively connected with the secondary electrodialysis module, the centrifugal pump and the three-effect evaporation unit, and the filter press is respectively connected with the three-effect evaporation unit and the primary electrodialysis module and the dryer;
the one-stage electrodialysis module with the second-stage electrodialysis module comprises anode chamber, cathode chamber, a plurality of desalination ponds and a plurality of concentrated pond, the one-stage electrodialysis module with the second-stage electrodialysis module the anode chamber all with DC power supply's anodal is connected, the one-stage electrodialysis module with the second-stage electrodialysis module the cathode chamber all with DC power supply's negative pole is connected.
2. The recycling pretreatment method for waste water of ethylene production using the recycling treatment apparatus for waste water of ethylene production according to claim 1, comprising the steps of:
performing primary electrodialysis treatment on the ethephon wastewater by using the primary electrodialysis module to obtain a primary electrodialysis concentrated solution and a primary electrodialysis desalted solution;
feeding the first-stage electrodialysis concentrated solution into the triple-effect evaporation unit for treatment to obtain sodium chloride strong brine, feeding the obtained sodium chloride strong brine into the filter press for filter pressing and dehydration to obtain a wet sodium chloride product, and drying the wet sodium chloride product by using the drying agent;
performing secondary electrodialysis treatment on the primary electrodialysis desalted liquid by using the secondary electrodialysis module to obtain a secondary electrodialysis concentrated liquid and a secondary electrodialysis desalted liquid;
and feeding the second-stage electrodialysis concentrated solution into a desalting tank in the first-stage electrodialysis module for treatment, and feeding the second-stage electrodialysis desalted solution into a wastewater station for treatment.
3. The recycling pretreatment method of waste water from recycling of waste water of ethylene as claimed in claim 2,
in the step of performing the first-stage electrodialysis treatment on the ethephon wastewater by using the first-stage electrodialysis module: the operating voltage of the first-stage electrodialysis module is 10-13V, the operating current is 1-1.2A, and the operating temperature is controlled to be less than 28 ℃.
4. The recycling pretreatment method of waste water from recycling of waste water of ethylene as claimed in claim 2,
in the step of feeding the first electrodialysis concentrated solution into the triple-effect evaporation unit for treatment: the triple effect evaporation unit controls the pressure of the evaporation process to be-0.09 Mpa to-0.2 Mpa, and the evaporation temperature is 80 ℃.
5. The recycling pretreatment method of waste water from recycling of waste water of ethylene as claimed in claim 2,
in the step of feeding the first electrodialysis concentrated solution into the triple-effect evaporation unit for treatment: the filter pressing pressure of the filter press is 0.4 MPa-0.6 MPa.
6. The recycling pretreatment method of waste water from recycling of waste water of ethylene as claimed in claim 2,
in the step of feeding the first electrodialysis concentrated solution into the triple-effect evaporation unit for treatment: the dryer is a single-channel dryer, the drying temperature is 80-100 ℃, and the drying time is 2-5 h.
7. The recycling pretreatment method of waste water from recycling of waste water of ethylene as claimed in claim 2,
in the step of performing secondary electrodialysis treatment on the primary electrodialysis desalted liquid by using the secondary electrodialysis module: the operating voltage of the secondary electrodialysis module is 10-13V, the operating current is 1-1.2A, and the operating temperature is controlled to be less than 28 ℃.
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