CN117049741A - A method for refining salty wastewater - Google Patents
A method for refining salty wastewater Download PDFInfo
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- CN117049741A CN117049741A CN202311140501.5A CN202311140501A CN117049741A CN 117049741 A CN117049741 A CN 117049741A CN 202311140501 A CN202311140501 A CN 202311140501A CN 117049741 A CN117049741 A CN 117049741A
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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
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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Abstract
本发明提供了一种含盐废水的精制方法，包括以下步骤：a)将含盐废水进行除杂后，通过补加盐酸控制pH为2～4，得到电渗析原水；b)将步骤a)得到的电渗析原水进行电渗析，控制终点电导率为75～90mS/cm，分别得到浓盐水和淡盐水；其中，浓盐水经深度精制后用于氯碱资源化；淡盐水回流至零排放预处理系统后，重复步骤a)进行精制。与现有技术相比，本发明提供的精制方法采用特定工艺步骤、条件及参数，实现整体较好的相互作用，在浓缩盐分的同时，限制TOC随盐分的迁移，强化了对盐分的偏向性浓缩，控制了TOC在浓缩盐水中的积累，从而减轻了后续精制压力，可以提升氯碱资源化工艺中副产盐的掺混比例，促使更多副产盐得以被资源化工艺消纳。
The invention provides a method for refining salt-containing wastewater, which includes the following steps: a) after removing impurities from the salt-containing wastewater, adding hydrochloric acid to control the pH to 2-4 to obtain electrodialysis raw water; b) performing step a) The obtained electrodialysis raw water is subjected to electrodialysis, and the end-point conductivity is controlled to 75-90 mS/cm to obtain concentrated brine and light brine respectively; among them, the concentrated brine is used for chlor-alkali resource utilization after being deeply refined; the light brine is returned to zero-discharge pretreatment After systemization, repeat step a) for refining. Compared with the existing technology, the refining method provided by the present invention adopts specific process steps, conditions and parameters to achieve better overall interaction. While concentrating salt, it limits the migration of TOC with salt and strengthens the bias towards salt. Concentration controls the accumulation of TOC in concentrated brine, thereby reducing the subsequent refining pressure and increasing the blending ratio of by-product salt in the chlor-alkali resource utilization process, allowing more by-product salt to be absorbed by the resource utilization process.
Description
Technical Field
The invention relates to the technical field of chlor-alkali reclamation, in particular to a refining method of salt-containing wastewater.
Background
At present, zero-emission byproduct sodium chloride is recycled for chlor-alkali recycling, which becomes a promising attack direction, and the deep refining of the byproduct sodium chloride is the key for realizing the recycling finally. The zero-emission brine sodium chloride has lower salinity, can not realize the recycling directly, and can be accessed into the chlor-alkali recycling process after the salinity is concentrated, deeply refined and industrial salt is blended. The existing refining process is to treat the zero-emission brine by a chemical method and a physical method, so that the refined index, particularly TOC (total organic matters), meets the salt requirement for the chlor-alkali recycling process, and can be reused as part of production salt for production.
In the prior electrodialysis scheme, TOC components are enriched at the same time of salt concentration, and higher requirements are put on the subsequent refining process. In order to ensure the effect of the recycling process, two general process schemes exist: (1) first treating TOC and then concentrating brine; (2) concentrating the brine and then deeply removing TOC.
However, the prior art also has the following disadvantages: (1) In the prior art relating to electrodialysis, salt concentration and TOC enrichment are generally synchronous, and the salt concentration and TOC enrichment are contradictory in process economy; (2) Along with the continuous concentration of salt, the energy consumption required to be input for the TOC treatment in the prior art is increased.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for refining salt-containing wastewater, which can concentrate salt and limit TOC enrichment by adjusting process parameters, and only needs fine adjustment of electrodialysis concentration conditions, so that the energy consumption of salt concentration is not affected, and simultaneously, TOC enrichment is limited, and the energy consumption of TOC treatment is reduced.
The invention provides a refining method of salt-containing wastewater, which comprises the following steps:
a) Removing impurities from the salt-containing wastewater, and controlling the pH value to be 2-4 by adding hydrochloric acid to obtain electrodialysis raw water;
b) Electrodialysis is carried out on the electrodialysis raw water obtained in the step a), and the final conductivity is controlled to be 75-90 mS/cm, so that strong brine and weak brine are respectively obtained; wherein, the concentrated brine is deeply refined and then is used for recycling chlor-alkali; and d), after the light brine is returned to the zero-emission pretreatment system, repeating the step a) for refining.
Preferably, the sodium chloride content in the salt-containing wastewater in the step a) is 100-120 g/L, the TOC content is 29-100 mg/L, and the calcium-magnesium hardness is CaCO 3 500-2000 mg/L and 15-50 mg/L of silicon.
Preferably, the impurity removal process in step a) specifically includes:
a1 Removing calcium, magnesium, silicon and suspended matters in the brine wastewater by using a chemical coagulation process to obtain filtered brine;
a2 And (3) regulating the pH value of the filtered brine to 8-9, introducing chelate resin, and deeply removing the hardness components contained in the brine to obtain the purified brine.
Preferably, in the filtered brine of step a 1), the calcium and magnesium content is <10mg/L and the silicon is <5mg/L.
Preferably, the content of calcium and magnesium in the purified brine in the step a 2) is less than 1mg/L.
Preferably, the additional hydrochloric acid in step a) controls the pH to 2.5-3.5.
Preferably, the controlled endpoint conductivity in step b) is 80mS/cm.
Preferably, before the electrodialysis in step b), the method further comprises:
and (3) purifying the TOC of the electrodialysis raw water by using macroporous adsorption resin to obtain the TOC-purified electrodialysis raw water.
Preferably, the TOC content of the electrodialysis raw water after TOC refining is less than or equal to 31mg/L.
The invention also provides a byproduct sodium chloride for recycling chlor-alkali, which is obtained by the refining method in the technical scheme, and is reused as a raw material for producing chlor-alkali after deep refining of electrodialysis strong brine.
The invention provides a refining method of salt-containing wastewater, which comprises the following steps: a) Removing impurities from the salt-containing wastewater, and controlling the pH value to be 2-4 by adding hydrochloric acid to obtain electrodialysis raw water; b) Electrodialysis is carried out on the electrodialysis raw water obtained in the step a), and the final conductivity is controlled to be 75-90 mS/cm, so that strong brine and weak brine are respectively obtained; wherein, the concentrated brine is deeply refined and then is used for recycling chlor-alkali; and d), after the light brine is returned to the zero-emission pretreatment system, repeating the step a) for refining. Compared with the prior art, the refining method provided by the invention adopts specific process steps, conditions and parameters to realize overall better interaction, limits the migration of TOC along with salt while concentrating the salt, strengthens the biased concentration of the salt, and controls the accumulation of TOC in the concentrated salt water, thereby reducing the subsequent refining pressure, improving the mixing proportion of byproduct salt in the chlor-alkali recycling process, and promoting more byproduct salt to be consumed by the recycling process.
Drawings
FIG. 1 shows a method for refining salt-containing wastewater provided by an embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a refining method of salt-containing wastewater, which comprises the following steps:
a) Removing impurities from the salt-containing wastewater, and controlling the pH value to be 2-4 by adding hydrochloric acid to obtain electrodialysis raw water;
b) Electrodialysis is carried out on the electrodialysis raw water obtained in the step a), and the final conductivity is controlled to be 75-90 mS/cm, so that strong brine and weak brine are respectively obtained; wherein, the concentrated brine is deeply refined and then is used for recycling chlor-alkali; and d), after the light brine is returned to the zero-emission pretreatment system, repeating the step a) for refining.
The invention provides a concentration refining process of zero-emission brine, which reduces the enrichment trend of TOC in the concentrated brine while concentrating the brine, thereby reducing the subsequent TOC refining treatment pressure and improving the utilization rate. The process only controls the pH and the end point conductivity in the electrodialysis concentration process, is simple to operate, has limited influence on the cost of the electrodialysis process, reduces TOC enrichment while obtaining strong brine, and has better economy.
The invention firstly removes the impurities from the salt-containing wastewater, and then the pH value is controlled to be 2-4 by adding hydrochloric acid, thus obtaining electrodialysis raw water.
In the invention, sodium chloride in the salt-containing wastewaterThe content is preferably 100 to 120g/L, more preferably 106 to 117g/L, the TOC content is preferably 29 to 100mg/L, more preferably 29 to 51mg/L, and the calcium magnesium hardness is CaCO 3 The content of silicon is preferably 500 to 2000mg/L, more preferably 1000 to 1500mg/L, and the content of silicon is preferably 15 to 50mg/L, more preferably 20 to 23mg/L. The source of the salt-containing wastewater is not particularly limited, and zero-emission brine or a solution obtained by dissolving solid salt of byproduct sodium chloride can be adopted, which is well known to a person skilled in the art.
In the invention, the impurity removal process is preferably specifically as follows:
a1 Removing calcium, magnesium, silicon and suspended matters in the brine wastewater by using a chemical coagulation process to obtain filtered brine;
a2 And (3) regulating the pH value of the filtered brine to 8-9, introducing chelate resin, and deeply removing the hardness components contained in the brine to obtain the purified brine.
The specific process of the chemical coagulation process is not particularly limited, and the method is realized by adopting the technical means of removing calcium, magnesium, silicon and suspended matters in the brine through sodium carbonate, sodium hydroxide, magnesium salt and ferric trichloride and then filtering, which are well known to the person skilled in the art.
In the filtered brine, the calcium and magnesium content is preferably <10mg/L and the silicon content is preferably <5mg/L.
The kind and source of the chelate resin are not particularly limited, and the commercial product in which the hardness component contained in the brine is deeply removed in the above-mentioned chelate resin process can be realized.
In the present invention, the content of calcium and magnesium in the purified brine is preferably <1mg/L.
In the invention, the pH of the supplemented hydrochloric acid is controlled to be 2-4, preferably 2.5-3.5, and electrodialysis raw water is obtained for subsequent salt concentration.
After electrodialysis raw water is obtained, electrodialysis is carried out on the obtained electrodialysis raw water, and the final conductivity is controlled to be 75-90 mS/cm, so that strong brine and weak brine are respectively obtained; wherein, the concentrated brine is deeply refined and then is used for recycling chlor-alkali; and d), after the light brine is returned to the zero-emission pretreatment system, repeating the step a) for refining.
In the present invention, before the electrodialysis is performed, the electrodialysis device preferably further comprises:
and (3) purifying the TOC of the electrodialysis raw water by using macroporous adsorption resin to obtain the TOC-purified electrodialysis raw water. In the present invention, the TOC content of the electrodialysis raw water after TOC purification is preferably 31mg/L or less.
In the present invention, the control endpoint conductivity is 75 to 90mS/cm, preferably 80mS/cm.
According to the method, conditions such as salt concentration at the salt water end point are controlled, and a TOC enrichment rule is obtained; and further, according to the enrichment rule of the salt and the TOC, determining the biased enrichment process condition, strengthening the separation of the salt and the TOC, and reducing the migration quantity of the TOC in the strong brine.
In the present invention, "TOC with NaCl mobility" is defined as: migration TOC amount/migration NaCl amount; "migration TOC amount" is defined as: initial brine TOC concentration initial brine volume-end brine TOC concentration end brine volume; "migrate NaCl amount" is defined as: initial strong brine NaCl concentration (initial strong brine volume-end strong brine NaCl concentration (end strong brine volume)).
The invention provides a simple and feasible operation method, which controls the enrichment of TOC and saves the subsequent refining cost of TOC in the strong brine while realizing the concentration of salt by electrodialysis.
The invention also provides a byproduct sodium chloride for recycling chlor-alkali, which is obtained by the refining method in the technical scheme, and is reused as a raw material for producing chlor-alkali after deep refining of electrodialysis strong brine.
The invention provides a method for limiting TOC enrichment process to reuse byproduct sodium chloride for chlor-alkali reclamation, and the electrodialysis strong brine is reused as raw material for producing chlor-alkali after advanced treatment, and the TOC content is reduced, so that the load of the subsequent refining process is reduced, and the blending proportion of the strong brine can be improved; the electrodialysis light brine is returned to the zero-emission pretreatment system, so that the impact on the zero-emission system is small due to the reduction of the salt content of the light brine, and the treatment difficulty of TOC contained in the electrodialysis light brine is also reduced; through the biased enrichment process conditions, the separation of salt and TOC by electrodialysis is enhanced, and the overall economy of the process flow is improved.
The invention provides a refining method of salt-containing wastewater, which comprises the following steps: a) Removing impurities from the salt-containing wastewater, and controlling the pH value to be 2-4 by adding hydrochloric acid to obtain electrodialysis raw water; b) Electrodialysis is carried out on the electrodialysis raw water obtained in the step a), and the final conductivity is controlled to be 75-90 mS/cm, so that strong brine and weak brine are respectively obtained; wherein, the concentrated brine is deeply refined and then is used for recycling chlor-alkali; and d), after the light brine is returned to the zero-emission pretreatment system, repeating the step a) for refining. Compared with the prior art, the refining method provided by the invention adopts specific process steps, conditions and parameters to realize overall better interaction, limits the migration of TOC along with salt while concentrating the salt, strengthens the biased concentration of the salt, and controls the accumulation of TOC in the concentrated salt water, thereby reducing the subsequent refining pressure, improving the mixing proportion of byproduct salt in the chlor-alkali recycling process, and promoting more byproduct salt to be consumed by the recycling process.
In order to further illustrate the present invention, the following examples are provided.
Example 1
The approximate composition of a certain zero emission brine is as follows: sodium chloride content 117g/L, TOC content 51mg/L, calcium magnesium hardness about 1000mg/L (CaCO) 3 Calculated as), the silicon content is 20mg/L.
The method for refining the salt-containing wastewater shown in fig. 1 is adopted for recycling, and comprises the following specific steps:
(1) After chemical coagulation treatment, the calcium and magnesium content in the salt water is less than 10mg/L, and the silicon content is less than 5mg/L;
(2) Adjusting the pH value of the brine to be 8-9, and introducing chelate resin, wherein the calcium and magnesium content is less than 1mg/L;
(3) Respectively regulating the pH value of the brine in the step (2) to be neutral and acidic, taking the brine prepared from refined industrial salt as absorption liquid, and controlling the conductivity at the end point to be 90mS/cm, wherein the initial sodium chloride content is 118g/L and the TOC content is N.D.;
(4) After the concentration is finished, the acid condition is as follows: the sodium chloride content is concentrated from 118g/L to 188g/L, the TOC content is increased to 8.85mg/L, and the TOC mobility with NaCl is 0.072mg TOC/g NaCl; neutral conditions: the sodium chloride content is concentrated from 118g/L to 188g/L, the TOC content is increased to 9.9mg/L, and the TOC mobility with NaCl is 0.083mg TOC/g NaCl;
(5) By controlling the concentration conditions, the TOC is reduced by 13% along with the NaCl mobility on the basis of ensuring the salt concentration effect, and the working energy consumption is not obviously different.
Example 2
The approximate composition of a certain zero emission brine is as follows: sodium chloride 106g/L, TOC 48mg/L, calcium magnesium hardness about 1200mg/L (CaCO) 3 Calculated as), silicon content was 22mg/L.
The method for refining the salt-containing wastewater shown in fig. 1 is adopted for recycling, and comprises the following specific steps:
(1) After chemical coagulation treatment, the calcium and magnesium content in the salt water is less than 10mg/L, and the silicon content is less than 5mg/L;
(2) Adjusting the pH value of the brine to be 8-9, and introducing chelate resin, wherein the calcium and magnesium content is less than 1mg/L;
(3) Adjusting the pH of the brine in the step (2) to be acidic, and respectively controlling the end point conductivity to be 60, 65, 70, 75 and 80mS/cm as electrodialysis raw water;
(4) After the concentration is finished, the following results are obtained:
(5) The endpoint conductivity of raw water will affect TOC mobility with NaCl, and TOC enrichment can be effectively limited by proper control of endpoint conductivity.
Example 3
The approximate composition of a certain zero emission brine is as follows: the content of sodium chloride is 114g/L, the TOC content is 29mg/L, and the calcium-magnesium hardness is about 1500mg/L (CaCO is used) 3 Calculated as), the silicon content is 23mg/L.
The method for refining the salt-containing wastewater shown in fig. 1 is adopted for recycling, and comprises the following specific steps:
(1) After chemical coagulation treatment, the calcium and magnesium content in the salt water is less than 10mg/L, and the silicon content is less than 5mg/L;
(2) Adjusting the pH value of the brine to be 8-9, and introducing chelate resin, wherein the calcium and magnesium content is less than 1mg/L;
(3) Adjusting the pH of the brine in the step (2) to be acidic, controlling the end point conductivity to be 80mS/cm as electrodialysis raw water, and dropwise adding 1 into a group of raw water during the test: 1 hydrochloric acid, controlling the pH to be in the whole range to 3, and adding no hydrochloric acid to the other group;
(4) After the concentration is finished, the following results are obtained:
(5) By controlling the pH of the electrodialysis raw water in the whole course to 3 in the concentration process, the TOC is further reduced by 46% along with the mobility of NaCl, which shows that the enrichment of TOC is obviously improved by controlling the concentration condition of salt.
Example 4
The approximate composition of a certain zero emission brine is as follows: sodium chloride content 117g/L, TOC content 51mg/L, calcium magnesium hardness about 1000mg/L (CaCO) 3 Calculated as), the silicon content is 20mg/L.
The method for refining the salt-containing wastewater shown in fig. 1 is adopted for recycling, and comprises the following specific steps:
(1) After chemical coagulation treatment, the calcium and magnesium content in the salt water is less than 10mg/L, and the silicon content is less than 5mg/L;
(2) Adjusting the pH value of the brine to be 8-9, and introducing chelate resin, wherein the calcium and magnesium content is less than 1mg/L;
(3) Regulating the pH value of the salt water in the step (2) to 3 by using hydrochloric acid, refining TOC by using macroporous adsorption resin, and finally obtaining water with the TOC content of 31mg/L;
(4) Adjusting the pH of the brine in the step (3) to be acidic, and controlling the end point conductivity to be 75 mS/cm and 80mS/cm respectively as electrodialysis raw water;
(5) After the concentration is finished, the following results are obtained:
(6) After TOC is adsorbed, the conductivity of the raw water end point still can influence the mobility of TOC along with NaCl, and the enrichment of TOC can be effectively limited by controlling the conductivity of the raw water end point, so that the mobility of TOC along with NaCl is reduced by 32%; by introducing the TOC refining process, the enrichment trend of TOC is further reduced, and the TOC is reduced by 22% along with the mobility of NaCl.
The data show that the enrichment of TOC in the NaCl concentration process can be effectively relieved by combining electrodialysis parameter control with TOC refining technology.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A refining method of salt-containing wastewater comprises the following steps:
a) Removing impurities from the salt-containing wastewater, and controlling the pH value to be 2-4 by adding hydrochloric acid to obtain electrodialysis raw water;
b) Electrodialysis is carried out on the electrodialysis raw water obtained in the step a), and the final conductivity is controlled to be 75-90 mS/cm, so that strong brine and weak brine are respectively obtained; wherein, the concentrated brine is deeply refined and then is used for recycling chlor-alkali; and d), after the light brine is returned to the zero-emission pretreatment system, repeating the step a) for refining.
2. The refining method according to claim 1, wherein the salt-containing wastewater in the step a) has a sodium chloride content of 100 to 120g/L and a TOC content of 29 to 100mg/L, and the hardness of calcium and magnesium is CaCO 3 500-2000 mg/L and 15-50 mg/L of silicon.
3. The refining method as recited in claim 1, wherein the impurity removal process in the step a) is specifically:
a1 Removing calcium, magnesium, silicon and suspended matters in the brine wastewater by using a chemical coagulation process to obtain filtered brine;
a2 And (3) regulating the pH value of the filtered brine to 8-9, introducing chelate resin, and deeply removing the hardness components contained in the brine to obtain the purified brine.
4. The refining method as claimed in claim 3, wherein the filtered brine in step a 1) has a calcium/magnesium content of <10mg/L and a silicon content of <5mg/L.
5. The refining method as claimed in claim 3, wherein the purified brine in step a 2) has a calcium and magnesium content of <1mg/L.
6. The refining method as recited in claim 1, wherein the additional hydrochloric acid in the step a) controls the pH to 2.5 to 3.5.
7. The refining process of claim 1, wherein the controlled endpoint conductivity in step b) is 80mS/cm.
8. The refining process as recited in any one of claims 1 to 7, characterized in that before electrodialysis in step b), it further comprises:
and (3) purifying the TOC of the electrodialysis raw water by using macroporous adsorption resin to obtain the TOC-purified electrodialysis raw water.
9. The purification method according to claim 8, wherein the TOC content of the electrodialysis raw water after TOC purification is 31mg/L or less.
10. The byproduct sodium chloride for recycling chlor-alkali is prepared by deep refining electrodialysis strong brine and then recycling the electrodialysis strong brine as a raw material for producing chlor-alkali, and is characterized in that the byproduct sodium chloride is the byproduct sodium chloride with TOC enrichment limitation obtained by the refining method of any one of claims 1-7.
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| CN107344785A (en) * | 2017-08-30 | 2017-11-14 | 东华工程科技股份有限公司 | A kind of solventing-out method of embrane method, the hot method group technology processing high strong brine of coal chemical industry |
| CN111268834A (en) * | 2020-03-19 | 2020-06-12 | 大唐环境产业集团股份有限公司 | Desulfurization wastewater treatment system and method capable of recycling resources |
| CN112159023A (en) * | 2020-08-18 | 2021-01-01 | 聊城鲁西聚碳酸酯有限公司 | High-salinity wastewater treatment method and treatment system |
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