CN115636550A - MVR evaporation crystallization mother liquor reduction and disposal system and disposal method thereof - Google Patents
MVR evaporation crystallization mother liquor reduction and disposal system and disposal method thereof Download PDFInfo
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- 239000012452 mother liquor Substances 0.000 title claims abstract description 40
- 238000001704 evaporation Methods 0.000 title claims abstract description 35
- 230000008020 evaporation Effects 0.000 title claims abstract description 35
- 238000002425 crystallisation Methods 0.000 title claims abstract description 33
- 230000008025 crystallization Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000009467 reduction Effects 0.000 title claims abstract description 16
- 150000003839 salts Chemical class 0.000 claims abstract description 22
- 239000002351 wastewater Substances 0.000 claims abstract description 20
- 238000000926 separation method Methods 0.000 claims abstract description 19
- 238000005189 flocculation Methods 0.000 claims abstract description 14
- 230000016615 flocculation Effects 0.000 claims abstract description 14
- 238000001556 precipitation Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 238000001223 reverse osmosis Methods 0.000 claims description 17
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 238000004062 sedimentation Methods 0.000 claims description 11
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- 238000000108 ultra-filtration Methods 0.000 claims description 7
- 239000008394 flocculating agent Substances 0.000 claims description 5
- 239000000701 coagulant Substances 0.000 claims description 4
- 150000002500 ions Chemical class 0.000 claims description 4
- 244000005700 microbiome Species 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 9
- 239000012528 membrane Substances 0.000 description 7
- 238000009292 forward osmosis Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 238000009300 dissolved air flotation Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000012267 brine Substances 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
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- 238000005188 flotation Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Abstract
The invention provides a MVR evaporation crystallization mother liquor reduction and disposal system and a disposal method thereof, wherein the disposal system sequentially comprises a pretreatment unit, a biochemical unit, a flocculation precipitation unit, a deep treatment unit and a multi-effect evaporation unit; the wastewater sequentially passes through a pretreatment unit, a biochemical unit, a flocculation precipitation unit, a deep treatment unit and a multi-effect evaporation unit to achieve salt separation treatment. The MVR evaporation crystallization mother liquor reduction and disposal system and the disposal method thereof have the advantages of simple structure, simple and convenient operation, small occupied area and low cost.
Description
Technical Field
The invention relates to the field of MVR evaporation crystallization mother liquor decrement, in particular to a MVR evaporation crystallization mother liquor decrement and disposal system and a disposal method thereof.
Background
At present, waste water produced in the production process of various industries, namely organic waste water and high-salinity waste water, is difficult to treat. There are many methods currently used for wastewater treatment: pretreatment such as oil separation sedimentation tank and air flotation, biochemical treatment methods such as hydrolysis acidification, anaerobic and aerobic oxidation, advanced oxidation advanced treatment methods such as ozone and electrocatalysis and the like can not solve the problem of wastewater completely. At present, dozens of zero emission projects are built and operated in China. In the operation of zero-emission plants, many face the problem of reprocessing the evaporation mother liquor. The mother liquor has complex components, high concentration of pollutants and great difficulty in secondary evaporation treatment, becomes a difficult point and a pain point in the industry, and also hinders the development of zero emission in the coal chemical industry.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide an MVR evaporation crystallization mother liquor reduction and treatment system, the purification system has simple structure, simple and convenient operation, small occupied area and low cost, solves the problems of incomplete salt separation, low purity and low utilization rate, realizes the salt separation technology of sodium sulfate and sodium chloride in high-salinity wastewater, ensures the purity of the sodium sulfate and the sodium chloride, and can recycle the produced high-purity salt into industrial production to ensure that no wastewater and solid waste are discharged and realize zero emission.
The second purpose of the invention is to provide the disposal method using the disposal system, which has the advantages of simple operation, mild operation conditions, safety and environmental protection.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the invention provides a MVR evaporation crystallization mother liquor reduction and disposal system, which sequentially comprises a pretreatment unit, a biochemical unit, a flocculation precipitation unit, a deep treatment unit and a multi-effect evaporation unit; the wastewater sequentially passes through a pretreatment unit, a biochemical unit, a flocculation precipitation unit, a deep treatment unit and a multi-effect evaporation unit to achieve salt separation treatment.
Preferably, as a further implementable scheme, the pretreatment unit comprises a grid regulating tank and a dissolved air floatation tank which are sequentially connected, and a flocculating agent and a coagulating agent are added into the dissolved air floatation tank.
Preferably, as a further implementable solution, the biochemical unit comprises a connected in series a 2 O tank and secondary sedimentation tank, A 2 A plurality of salt-tolerant microorganisms are arranged in the O tank.
Preferably, as a further practical scheme, the flocculation precipitation unit comprises a high-density sedimentation tank and an intermediate water tank, and the wastewater is subjected to hardness and turbidity removal by adding PAC, PAM, sodium hydroxide and sodium carbonate.
Furthermore, a plurality of layers of filter screens are arranged in the middle water tank.
Preferably, as a further practicable scheme, a plurality of layers of filter screens are arranged in the middle water tank.
Preferably, as a further implementable solution, the multi-effect evaporation unit comprises an MVR evaporator and a mother liquor evaporator connected with the MVR evaporator, and residual mother liquor is evaporated and crystallized in the mother liquor evaporator.
Preferably, as a further practicable scheme, the multi-effect evaporation unit further comprises a salt separation device, and the MVR evaporator and the mother liquor evaporator are connected with the salt separation device for subsequent salt separation treatment.
The invention provides a system for reducing and disposing MVR evaporation crystallization mother liquor and a method for reducing and disposing MVR evaporation crystallization mother liquor, which specifically comprises the following steps:
the wastewater sequentially passes through a pretreatment unit, a biochemical unit, a flocculation precipitation unit, a deep treatment unit and a multi-effect evaporation unit to achieve salt separation treatment.
The MVR evaporative crystallization mother liquor reduction and disposal system not only can realize the MVR evaporative crystallization mother liquor reduction and disposal technology, but also can reduce the operation cost of enterprises and reduce the pollutant discharge.
In practical operation, the method for reducing and disposing the MVR evaporative crystallization mother liquor can be carried out according to the following steps:
1. a pretreatment stage: the wastewater treatment device comprises a grid adjusting tank and a dissolved air flotation tank, and mainly has the functions of adjusting the pH of wastewater to be neutral in the adjusting tank, then enabling the wastewater to enter the dissolved air flotation tank, adding a flocculating agent and a coagulant to remove oil and suspended matters in the water, and reducing turbidity.
2. And (3) biochemical treatment stage: comprises A 2 And O and a secondary sedimentation tank, wherein the pretreated produced water is introduced into a biological filter for biochemical oxidation treatment to remove organic matters in the water, and salt-tolerant microorganisms are added in a biochemical section.
3. A flocculation precipitation stage: the method comprises a high-density sedimentation tank and a middle water tank, wherein PAC, PAM, sodium hydroxide and sodium carbonate are added at the stage, and then HCl is added, so that the wastewater is subjected to hardness removal and turbidity removal.
4. And (3) a deep treatment stage: the method comprises a multi-medium filter, ultrafiltration, an intermediate water tank, an ion exchanger and reverse osmosis, wherein backwashing water of the multi-medium filter and an ultrafiltration system returns to a flocculation unit for secondary treatment, reverse osmosis produced water is used for production, and concentrated water enters an MVR evaporator for multi-effect evaporation.
5. A multi-effect evaporation stage: introducing the reverse osmosis concentrated water into an MVR evaporator for evaporation crystallization, introducing the reverse osmosis concentrated water into a salt separation device from a crystallization separator for salt separation treatment, introducing the residual mother liquor into a mother liquor evaporator for evaporation crystallization again, and then performing salt separation treatment.
Compared with the prior art, the invention has the following beneficial effects:
(1) The disposal system has the advantages of simple structure, simple and convenient operation, small occupied area and low cost, and not only can realize the MVR evaporation crystallization mother liquor reduction and disposal technology, but also can realize the reduction of the operation cost of enterprises and the reduction of the pollutant discharge.
(2) The treatment method is simple, easy to implement and short in flow, and can produce products with higher added values, so that wide market benefits are formed.
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.
FIG. 1 is a schematic structural diagram of a MVR evaporative crystallization mother liquor reduction and disposal system according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Examples
The MVR evaporation crystallization mother liquor decrement and disposal method is carried out according to the following steps, and the specific implementation steps are shown in figure 1:
1. a pretreatment unit: the wastewater treatment device comprises a grid regulating tank and a dissolved air flotation tank which are connected in sequence, and mainly has the functions of feeding wastewater into the regulating tank, regulating the pH value to be neutral, feeding the wastewater into the dissolved air flotation tank, adding a flocculating agent and a coagulant to remove oil and suspended matters in the water, and reducing turbidity.
2. A biochemical unit: comprises A connected in sequence 2 O and a secondary sedimentation tank, and the produced water of the pretreatment unit is introduced into the A 2 And O is subjected to biochemical oxidation treatment to remove organic matters in water, salt-tolerant microorganisms are required to be added in a biochemical section, and a filter screen is arranged in the secondary sedimentation tank in order to improve the sedimentation effect.
3. A flocculation precipitation unit: the method comprises a high-density sedimentation tank and a middle water tank, PAC, PAM, sodium hydroxide and sodium carbonate are required to be added at the stage, then HCl is added, the aim is to remove hardness and turbidity of the wastewater, other flocculating agents can be added, and a multi-layer filter screen is arranged in the middle water tank.
4. A depth processing unit: the multi-media filter and ultrafiltration system reverse osmosis system comprises a multi-media filter, an ultrafiltration chamber, a middle water tank, an ion exchanger and a reverse osmosis system, wherein reverse washing water of the multi-media filter and the ultrafiltration system returns to a flocculation precipitation unit for secondary treatment, reverse osmosis produced water is used for production, and concentrated water enters an MVR evaporator for multi-effect evaporation.
Except using reverse osmosis system, can also adopt the forward osmosis system in the advanced treatment unit stage, reverse osmosis system includes that RO intakes case, RO charge pump, RO membrane and the membrane shell of establishing in the RO membrane outside, and forward osmosis system includes FO concentrated brine case, FO charge pump, draws liquid charge pump, dilution and draws liquid storage tank, draws liquid recovery system, strong brine air stripping system, FO membrane and establishes the membrane shell in the FO membrane outside.
The reverse osmosis system can be designed into multi-stage treatment, wherein the first stage reverse osmosis concentration is used as a first concentrated solution, the last stage reverse osmosis concentration is used as a first separated solution, the separated solutions of the other stages continue to enter the next stage for reverse osmosis concentration, and the concentrated solution returns to the previous stage for reverse osmosis concentration again; preferably a 2-stage treatment.
The forward osmosis is a process that water molecules spontaneously permeate from high-salt water to a drawing liquid under the driving force of osmotic pressure difference generated on two sides of a semipermeable membrane, and a substance mainly generating a power source is the drawing liquid. These characteristics ensure that the forward osmosis unit has higher anti-pollution performance, and likewise, forward osmosis concentration can also be designed to be single-stage or multi-stage treatment, but in consideration of cost and concentration effect, the single-stage treatment can meet the requirement.
According to specific requirements, one or more treatment means of the multi-media filter, the ultra-filtration tank, the ion exchanger and the reverse osmosis equipment can be organically combined.
5. A multi-effect evaporation unit: and introducing the concentrated water from the reverse osmosis system into an MVR evaporator for evaporation and crystallization, introducing the concentrated water into a salt separating device from a crystallization separator for salt separation treatment, introducing the residual mother liquor into a mother liquor evaporator for evaporation and crystallization again, and then performing salt separation treatment.
In the above disposal process, the used equipment includes a crystallizer, a recycling water tank, a centrifuge and a vibrating conveyor, and the material of the main body of the crystallizer is 1.4529 stainless steel or Alloy926. Wherein, the crystallizer operates under the negative pressure state, and the concentrated solution generated by the forward osmosis system is continuously concentrated to produce water solid crystal salt. The boiling point of the strong brine processed by the crystallizer is greatly increased, the crystallizer adopts a steam driving mode and is provided with a thermodynamic steam compressor to reduce the consumption of fresh steam, and main equipment comprises a circulating pump, a heat exchanger, a condenser, a delivery pump, a cyclone separator and the like. And the crystallized and separated solid particles are dehydrated and dried by a centrifugal machine and then are conveyed to a crystallized salt packaging workshop by a vibrating conveyor for further treatment.
The material selection of the equipment of the invention is also required, and because the waste water is in weak acidity, the suitable material is selected for each component in consideration of the corrosivity to the operation equipment and the fully prolonged service life of the equipment, so that the inventor also pays a great deal of creative work.
Examples of the experiments
The results of treating the industrial wastewater by using the treatment system according to the above embodiment are shown in tables 1 to 2 below.
TABLE 1 quality of certain industrial waste water
| Serial number | Analysis item | Unit | Index of water quality |
| 1 | Appearance of the product | / | A large amount of black precipitate |
| 2 | SS | NTU | 926.3 |
| 3 | pH value of | / | 10.67 |
| 4 | Conductivity, 25 deg.C | μs/cm | 32165 |
| 5 | Ca 2+ | mg/L | 8176.3 |
| 6 | Mg 2+ | mg/L | 510.3 |
| 7 | Chlorine radical | mg/L | 16484.2 |
TABLE 2 Water quality after treatment according to the invention
| Serial number | Analyzing items | Unit of | Treated water quality |
| 1 | Appearance of the product | / | Colorless and transparent |
| 2 | SS | NTU | 3.2 |
| 3 | pH value | / | 7.54 |
| 4 | Conductivity, 25 deg.C | μs/cm | 453 |
| 5 | Ca 2+ | mmol/L | 1.6 |
| 6 | Mg 2+ | mg/L | 0 |
| 7 | Chlorine radical | mg/L | 137 |
As can be seen from the data in tables 1-2, the water quality after being treated by the treatment system of the embodiment of the invention reaches excellent levels in all aspects and can reach the standard of recycling.
In a word, the MVR evaporative crystallization mother liquor reduction and disposal system disclosed by the invention gets rid of the defect of adopting a single technology in the past, realizes the treatment of the high-salt-content wastewater by combining various evaporative crystallization and purification means, can obtain a product with a high added value, and is worthy of wide popularization and application.
While particular embodiments of the present invention have been illustrated and described, it would be obvious that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
Claims (9)
1. A MVR evaporation crystallization mother liquor decrement and disposal system is characterized by sequentially comprising a pretreatment unit, a biochemical unit, a flocculation precipitation unit, a deep treatment unit and a multi-effect evaporation unit; the wastewater sequentially passes through a pretreatment unit, a biochemical unit, a flocculation precipitation unit, a deep treatment unit and a multi-effect evaporation unit to achieve salt separation treatment.
2. The MVR evaporative crystallization mother liquor reduction and disposal system according to claim 1, wherein the pretreatment unit comprises a grid adjusting tank and a dissolved air floatation tank which are connected in sequence, and a flocculating agent and a coagulating agent are added into the dissolved air floatation tank.
3. The MVR evaporative crystallization mother liquor abatement and disposal system of claim 1, wherein the biochemical unit comprises a connected A 2 O tank and secondary sedimentation tank, A 2 A plurality of salt-tolerant microorganisms are arranged in the O tank.
4. The MVR evaporative crystallization mother liquor reduction and disposal system according to claim 1, wherein the flocculation precipitation unit comprises a high-density sedimentation tank and an intermediate water tank, and wastewater is subjected to hardness removal and turbidity removal by adding PAC, PAM, sodium hydroxide and sodium carbonate.
5. The MVR evaporative crystallization mother liquor abatement and disposal system of claim 4, wherein a plurality of layers of screens are disposed within the intermediate water basin.
6. The MVR evaporative crystallization mother liquor abatement and disposal system of claim 1, wherein said advanced treatment unit comprises one or a combination of several treatment means selected from the group consisting of a multi-media filter, an ultra-filtration tank, an ion exchanger, and a reverse osmosis device.
7. The MVR evaporative crystallization mother liquor reduction and disposal system according to claim 6, wherein the multi-effect evaporation unit comprises an MVR evaporator and a mother liquor evaporator connected with the MVR evaporator, wherein residual mother liquor is evaporated and crystallized in the mother liquor evaporator.
8. The MVR evaporative crystallization mother liquor decrement and disposal system according to claim 7, wherein the multi-effect evaporation unit further comprises a salt separation device, and the MVR evaporator and the mother liquor evaporator are connected with the salt separation device for subsequent salt separation treatment.
9. The method for disposing in a system for reducing and disposing MVR evaporative crystallization mother liquor as recited in any one of claims 1 to 8, comprising the steps of:
the wastewater sequentially passes through a pretreatment unit, a biochemical unit, a flocculation precipitation unit, a deep treatment unit and a multi-effect evaporation unit to achieve salt separation treatment.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105540967A (en) * | 2015-12-09 | 2016-05-04 | 大唐国际化工技术研究院有限公司 | Processing method for reducing and recycling organic waste water and processing system |
| CN107902826A (en) * | 2017-11-06 | 2018-04-13 | 新疆环境工程技术有限责任公司 | A kind of power plant desulfurization wastewater zero-discharge treatment system and method |
| CN113955892A (en) * | 2021-11-18 | 2022-01-21 | 宝武水务科技有限公司 | Concentrated salt wastewater evaporation crystallization mother liquor treatment method and system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105540967A (en) * | 2015-12-09 | 2016-05-04 | 大唐国际化工技术研究院有限公司 | Processing method for reducing and recycling organic waste water and processing system |
| CN107902826A (en) * | 2017-11-06 | 2018-04-13 | 新疆环境工程技术有限责任公司 | A kind of power plant desulfurization wastewater zero-discharge treatment system and method |
| CN113955892A (en) * | 2021-11-18 | 2022-01-21 | 宝武水务科技有限公司 | Concentrated salt wastewater evaporation crystallization mother liquor treatment method and system |
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