CN111675406A - Low-cost concentration reduction and resource treatment process for high-salinity wastewater - Google Patents
Low-cost concentration reduction and resource treatment process for high-salinity wastewater Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000008569 process Effects 0.000 title claims abstract description 20
- 230000009467 reduction Effects 0.000 title claims abstract description 11
- 239000012528 membrane Substances 0.000 claims abstract description 31
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000003546 flue gas Substances 0.000 claims abstract description 30
- 238000000909 electrodialysis Methods 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 150000003839 salts Chemical class 0.000 claims abstract description 21
- 238000001728 nano-filtration Methods 0.000 claims abstract description 19
- 238000004064 recycling Methods 0.000 claims abstract description 19
- 238000000926 separation method Methods 0.000 claims abstract description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 44
- 239000000243 solution Substances 0.000 claims description 23
- 239000012266 salt solution Substances 0.000 claims description 22
- 239000003513 alkali Substances 0.000 claims description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 10
- 239000003729 cation exchange resin Substances 0.000 claims description 7
- 238000001471 micro-filtration Methods 0.000 claims description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 7
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 7
- 239000013505 freshwater Substances 0.000 claims description 6
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- 239000003814 drug Substances 0.000 claims description 5
- 239000011780 sodium chloride Substances 0.000 claims description 5
- 239000002585 base Substances 0.000 claims description 4
- 239000007832 Na2SO4 Substances 0.000 claims description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 6
- 239000003245 coal Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
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Abstract
The invention discloses a low-cost concentration reduction and resource treatment process for high-salinity wastewater, which solves the problems that the prior art can not meet the current environmental protection requirement or has high investment and operation cost, the treated product can not realize resource utilization and the like. The device comprises a low-temperature flue gas/hot air heating concentration decrement system, a softening turbidity removal pretreatment system, a nanofiltration salt separation system and a bipolar membrane electrodialysis recycling treatment system. The invention provides a new process for treating high-salinity wastewater through the coupling synergistic effect of multiple systems, has reasonable design, meets the national environmental protection requirement, has low operation cost, and can recycle the treated product.
Description
Technical Field
The invention relates to the technical field of water pollution control, in particular to the related fields of wastewater treatment, resource utilization and the like.
Background
In the industrial production process, a large amount of high-salinity wastewater can be generated, such as thermal power plant desulfurization wastewater, acid-base wastewater, coal chemical wastewater, industrial park high-salinity wastewater and the like, and the high-salinity wastewater has the characteristics of complex components, unstable water quality and quantity and the like, so that the treatment difficulty is high and the treatment cost is high. With the continuous improvement of the environmental protection requirement, the treatment of high-salinity wastewater is more and more emphasized, and the common treatment modes at present comprise a conventional chemical precipitation technology, a zero-emission treatment technology and the like. For example, a neutralization-precipitation-coagulation triple box treatment process is commonly used for treating desulfurization wastewater of a thermal power plant, but the salt content of the treated wastewater is still high, and the existing environmental protection requirements are difficult to meet, so that many enterprises begin to try zero-emission treatment technologies. The zero-emission treatment technology of the high-salinity wastewater comprises softening turbidity removal treatment in the early stage, deep membrane concentration decrement treatment and evaporation crystallization treatment at the tail end. However, the investment cost and the operation cost of the treatment technology are high, and the treated product is difficult to treat or influences subsequent product processes, so that resource utilization cannot be realized.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the high-salinity wastewater treatment process which is reasonable in design, meets the national environmental protection requirements, is low in operation cost and can recycle the treatment product.
The technical scheme adopted by the invention for solving the problems is as follows: a low-cost concentration, decrement and resource treatment process for high-salinity wastewater is characterized by comprising a low-temperature flue gas/hot air heating concentration and decrement system, a softening and turbidity removal pretreatment system, a nanofiltration salt separation system and a bipolar membrane electrodialysis resource treatment system, wherein a high-salinity wastewater inlet port of the low-temperature flue gas/hot air heating concentration and decrement system is connected to a high-salinity wastewater pipeline, a steam condensate water reuse outlet of the low-temperature flue gas/hot air heating concentration and decrement system is connected to a fresh water reuse pipeline, and a concentrated water outlet of the low-temperature flue gas/hot air heating concentration and decrement system is connected with a water inlet of the softening and turbidity removal pretreatment system; the water outlet of the softening and turbidity removal pretreatment system is connected with the water inlet of the nanofiltration salt separation system; and a monovalent salt solution outlet and a divalent salt solution outlet of the nanofiltration salt separation system are respectively connected with a water inlet of the bipolar membrane electrodialysis recycling treatment system, and acid-base solution generated by the bipolar membrane electrodialysis recycling treatment system can be recycled.
Furthermore, the low-temperature flue gas/hot air heating concentration decrement system adopts hot flue gas of enterprises such as thermal power plants, coal chemical industry and the like as a heat source, and projects without the hot flue gas can adopt heated air as the heat source; therefore, the utilization rate of energy can be improved, the cost is saved, and the cost of subsequent treatment can be reduced; in addition, the system is provided with a high-salinity wastewater inlet interface, a steam condensate water recycling outlet and a concentrated water outlet, and fresh water after steam condensation can be recycled to other systems, so that the water utilization efficiency is improved.
Further, the softening and turbidity removal pretreatment system adopts NaOH/Na2CO3A double-alkali method dosing softening-tubular microfiltration membrane turbidity removal-cation exchange resin deep hardness removal process; therefore, the efficiency of softening and removing turbidity can be improved, and the service life and the operation period of the equipment can be ensured.
Furthermore, the nanofiltration salt separation system is provided with a high-salinity wastewater water inlet, a monovalent salt solution water outlet and a divalent salt solution water outlet, so that the subsequent bipolar membrane electrodialysis can conveniently perform quality-based treatment on monovalent salt solution and divalent salt solution.
Furthermore, the bipolar membrane electrodialysis recycling treatment system is provided with two sets of bipolar membrane electrodialysis devices for respectively treating monovalent salt solution (NaCl) and divalent salt solution (Na) generated by the nanofiltration salt separation system2SO4) Treating NaCl solution to generate NaOH and HCl solution by using bipolar membrane electrodialysis technology, and adding Na2SO4Solution treatment to generate NaOH and H2SO4The solution, the generated acid and alkali liquor can be recycled, and resource utilization is realized.
When in use, the high-salinity wastewater is heated, concentrated and reduced from the low-temperature flue gas/hot airThe interface of intaking of water flows in, and through the hot flue gas of enterprises such as thermal power plant, coal chemical industry or heated air as the heat source, carries out concentrated decrement with high salt waste water, and the steam that waste water evaporation formed passes through steam condensate water retrieval and utilization export condensation retrieval and utilization, improves the comprehensive utilization rate of water, and dense water gets into through dense water export and softens except that turbid pretreatment systems, through NaOH/Na2CO3Adding medicine for softening by a double alkali method, removing turbidity by a tubular microfiltration membrane, deeply removing hardness by cation exchange resin to reduce turbidity and hardness of high-salinity wastewater, continuously sending the wastewater to a nanofiltration salt separation system for separating monovalent salt solution and divalent salt solution, finally treating NaCl solution by two sets of bipolar membrane electrodialysis equipment to generate NaOH and HCl solution, and adding Na into the NaOH solution2SO4Solution treatment to generate NaOH and H2SO4The solution, the generated acid and alkali liquor can be recycled, and resource utilization is realized.
Compared with the prior art, the invention has the following advantages and effects:
1. the invention utilizes low-temperature flue gas, hot air and the like as heat sources of the concentration and reduction system, improves the energy utilization rate, greatly reduces the water treatment amount of the subsequent process and reduces the operation cost.
2. The softening and turbidity removal system adopts NaOH/Na2CO3The double-alkali method adds medicine for softening, the tubular microfiltration membrane removes turbidity, and the cation exchange resin removes hardness deeply, so that the softening and turbidity removing efficiency can be improved, and the service life and the operation cycle of the equipment can be ensured.
3. The invention can realize the resource treatment of the high-salinity wastewater, and the acid and alkali generated after the treatment can be reused in other systems, thereby being more environment-friendly and economical compared with the prior art.
Drawings
FIG. 1 is a process flow diagram of an embodiment of the invention.
In the figure: the system comprises a low-temperature flue gas/hot air heating concentration decrement system 1, a softening turbidity removal pretreatment system 2, a nanofiltration salt separation system 3, a bipolar membrane electrodialysis resource treatment system 4, a high-salinity wastewater pipeline 5 and a fresh water recycling pipeline 6.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
Referring to fig. 1, in this embodiment, a low-cost concentration, reduction and recycling treatment process for high-salinity wastewater includes a low-temperature flue gas/hot air heating concentration and reduction system 1, a softening and turbidity removal pretreatment system 2, a nanofiltration salt separation system 3 and a bipolar membrane electrodialysis recycling treatment system 4, a high-salinity wastewater inlet port of the low-temperature flue gas/hot air heating concentration and reduction system 1 is connected to a high-salinity wastewater pipeline 5, a steam condensate water recycling outlet of the low-temperature flue gas/hot air heating concentration and reduction system 1 is connected to a fresh water recycling pipeline 6, and a concentrated water outlet of the low-temperature flue gas/hot air heating concentration and reduction system 1 is connected to a water inlet of the softening and turbidity removal pretreatment system 2; the water outlet of the softening and turbidity removal pretreatment system 2 is connected with the water inlet of the nanofiltration salt separation system 3; and a monovalent salt solution outlet and a divalent salt solution outlet of the nanofiltration salt separation system 3 are respectively connected with a water inlet of the bipolar membrane electrodialysis recycling treatment system 4, and acid-base solution generated by the bipolar membrane electrodialysis recycling treatment system 4 can be recycled.
The low-temperature flue gas/hot air heating concentration decrement system 1 adopts hot flue gas of enterprises such as thermal power plants, coal chemical industry and the like as a heat source, and projects without the hot flue gas can adopt heated air as the heat source.
The softening and turbidity removal pretreatment system 2 adopts NaOH/Na2CO3The double alkali method adds medicine to soften, the tubular micro-filtration membrane removes turbidity, the cation exchange resin removes the hard craft deeply.
The bipolar membrane electrodialysis recycling treatment system 4 is provided with two sets of bipolar membrane electrodialysis devices for respectively treating monovalent salt solution and divalent salt solution generated by the nanofiltration salt separation system 3.
When in use, high-salinity wastewater flows in from a high-salinity wastewater inlet interface of the low-temperature flue gas/hot air heating concentration decrement system 1, the high-salinity wastewater is concentrated and reduced by taking hot flue gas or heated air of enterprises such as thermal power plants, coal chemical industry and the like as a heat source, steam is condensed and reused through a steam condensate water recycling outlet, the comprehensive utilization rate of water is improved,the concentrated water enters the softening and turbidity removal pretreatment system 2 through a concentrated water outlet and passes through NaOH/Na2CO3Adding medicine for softening by a double alkali method, removing turbidity by a tubular microfiltration membrane, deeply removing hardness by cation exchange resin to reduce the turbidity and hardness of the high-salinity wastewater, continuously sending the wastewater to a nanofiltration salt separation system 3 for separating monovalent salt solution and divalent salt solution, finally treating NaCl solution by two sets of bipolar membrane electrodialysis equipment to generate NaOH and HCl solution, and treating Na solution2SO4Solution treatment to generate NaOH and H2SO4The solution, the generated acid and alkali liquor can be recycled, and resource utilization is realized.
The implementation process comprises the following steps: the water quality and the water quantity of the high-salinity wastewater generated by a certain thermal power generating unit are as follows: conductivity of 62000 mu s/cm, TDS55000mg/L, chloride ion concentration of 28500mg/L and concentration of 50-60 m3The recovery rate of fresh water reaches more than 80 percent by adopting the process treatment and the coupling synergistic effect of multiple systems of heating, concentration and decrement, softening and turbidity removal, nanofiltration and salt separation and bipolar membrane electrodialysis, and the generated NaOH, HCl and H2SO4The solution molar concentration respectively reaches 2mol/L, 2mol/L and 1mol/L, and the solution can be reused in other systems of the plant to realize resource utilization. Through measurement and calculation, the process is expected to save the cost by about 1000 ten thousand per year compared with the traditional treatment process.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (3)
1. A low-cost concentration, decrement and resource treatment process for high-salinity wastewater is characterized by comprising a low-temperature flue gas/hot air heating concentration and decrement system (1), a softening and turbidity removal pretreatment system (2), a nanofiltration salt separation system (3) and a bipolar membrane electrodialysis resource treatment system (4), wherein a high-salinity wastewater inlet interface of the low-temperature flue gas/hot air heating concentration and decrement system (1) is connected to a high-salinity wastewater pipeline (5), a steam condensate water reuse outlet of the low-temperature flue gas/hot air heating concentration and decrement system (1) is connected to a fresh water reuse pipeline (6), and a concentrated water outlet of the low-temperature flue gas/hot air heating concentration and decrement system (1) is connected with a water inlet of the softening and turbidity removal pretreatment system (2); the water outlet of the softening and turbidity removal pretreatment system (2) is connected with the water inlet of the nanofiltration salt separation system (3); a monovalent salt solution water outlet and a divalent salt solution water outlet of the nanofiltration salt separation system (3) are respectively connected with a water inlet of the bipolar membrane electrodialysis recycling treatment system (4), and acid-base solution generated by the bipolar membrane electrodialysis recycling treatment system (4) is recycled;
the low-temperature flue gas/hot air heating concentration decrement system (1) adopts hot flue gas of an enterprise as a heat source, and adopts heating air as the heat source for projects without hot flue gas;
the softening and turbidity removal pretreatment system (2) adopts NaOH/Na2CO3The double alkali method adds medicine to soften, the tubular micro-filtration membrane removes turbidity, the cation exchange resin removes the hard craft deeply.
2. The high-salinity wastewater low-cost concentration reduction and recycling treatment process according to claim 1, characterized in that the bipolar membrane electrodialysis recycling treatment system (4) is provided with two sets of bipolar membrane electrodialysis devices for respectively treating monovalent salt solution and divalent salt solution generated by the nanofiltration salt separation system (3).
3. The low-cost concentration and resource treatment process of high-salinity wastewater as claimed in claim 2, wherein, in use, the high-salinity wastewater flows in from a high-salinity wastewater inlet port of the low-temperature flue gas/hot air heating concentration and reduction system (1), the high-salinity wastewater is concentrated and reduced by taking hot flue gas or heated air of an enterprise as a heat source, steam is condensed and recycled through a steam condensate water recycling outlet to improve the comprehensive utilization rate of water, concentrated water enters the softening and turbidity removal pretreatment system (2) through a concentrated water outlet, and the concentrated water passes through NaOH/Na2CO3Double-alkali method dosing softening-tubular microfiltration membrane turbidity removal-cation exchange resin deep hardness removal process for reducing turbidity of high-salinity wastewaterAnd hardness, continuously sending to a nanofiltration salt separating system (3) for separation of monovalent salt solution and divalent salt solution, finally treating NaCl solution by two sets of bipolar membrane electrodialysis equipment to generate NaOH and HCl solution, and adding Na2SO4Solution treatment to generate NaOH and H2SO4The solution, the generated acid and alkali liquor are recycled, and resource utilization is realized.
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| CN112979028A (en) * | 2021-01-07 | 2021-06-18 | 北京朗新明环保科技有限公司 | Coal-electricity integrated wastewater recycling intelligent treatment system and method |
| CN116282733A (en) * | 2023-04-03 | 2023-06-23 | 矿冶科技集团有限公司 | High-salt membrane concentrated water treatment method and high-salt membrane concentrated water treatment equipment |
| CN116815209A (en) * | 2023-07-20 | 2023-09-29 | 成都硕特科技股份有限公司 | Method and device for producing hydrogen by coupling waste water recycling |
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Application publication date: 20200918 |
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