CN112978964A - Low-cost recycling treatment system and method for high-salinity wastewater in coal chemical industry - Google Patents
Low-cost recycling treatment system and method for high-salinity wastewater in coal chemical industry Download PDFInfo
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Abstract
The invention relates to the technical field of coal chemical industry high-salt wastewater low-cost recycling treatment, in particular to a coal chemical industry high-salt wastewater low-cost recycling treatment system and a coal chemical industry high-salt wastewater low-cost recycling treatment method, which comprise a high-salt wastewater homogenizing pool, a first concentration device, a second concentration device and a third concentration device, wherein the first concentration device, the second concentration device and the third concentration device are respectively provided with a water production outlet and a concentrated water outlet; the method comprises the steps of reducing the water quantity to one fourth by utilizing a first concentration device after pretreatment, then carrying out step-by-step pretreatment, carrying out advanced treatment on impurities, scaling ions, organic matters and miscellaneous salts to obtain a salt solution with the main components of sodium sulfate and sodium chloride, concentrating and separating by a nanofiltration device to obtain a sodium sulfate solution and a sodium chloride solution with higher purity, and finally preparing acid-base by bipolar membrane electrodialysis. The invention has the advantages of simple operation, good treatment effect, low operation cost and the like.
Description
Technical Field
The invention relates to the technical field of coal chemical industry high-salt wastewater treatment, in particular to a low-cost recycling treatment system and method for coal chemical industry high-salt wastewater.
Background
The advanced treatment of water or the treatment of waste lye devices in the production process of coal chemical industry, petrochemical industry and natural gas chemical industry causes great harmfulness due to the complex characteristics of complex salt types and components, large pH value fluctuation, high organic matter content and the like in water quality, and mixed salt and industrial salt produced by conventional zero discharge cannot be directly used and cannot be stored for a long time, so that a low-cost recycling treatment system and a low-cost recycling treatment method for high-salt wastewater are necessary to solve the problems faced at present.
At present, the research on zero discharge process of partial units and colleges, for example, Chinese patent CN202011173907.X discloses a zero discharge process system for sewage treatment, and the sewage is directly treated to produce crystal salt. CN201810344100.4 discloses a zero release treatment process of high salt waste water, directly replaces hardness ions for the reaction in the water treatment process, does not concentrate first, and has higher operation cost. CN202010831763.6 discloses a high salt waste water treatment method and a treatment system, the method directly becomes strong brine and weak brine through electrodialysis under acidic condition, then the oxidation treatment is carried out, the cost of the method is higher, the method is faced with the market that the mixed salt production is increasing, the policy requirement that the environmental protection pressure is increasing, the cost is low, and the resource disposal method with universal applicability is necessary.
Disclosure of Invention
In order to solve the defects of high treatment cost and difficult product use of the existing high-salt wastewater, an economical, efficient and simple-to-operate low-cost recycling treatment system and method for the high-salt wastewater in the coal chemical industry are provided, and the system and method are used for removing hardness, impurities, organic matters and miscellaneous salts in the wastewater and producing hydrochloric acid, sulfuric acid and sodium hydroxide solution used in the industry.
The invention relates to a low-cost recycling treatment system for high-salinity wastewater in coal chemical industry, which comprises a high-salinity wastewater homogenizing pool, a first concentration device, a second concentration device and a third concentration device, wherein the first concentration device, the second concentration device and the third concentration device are respectively provided with a water production outlet and a concentrated water outlet;
the high-salinity wastewater homogenizing tank is connected with a first concentration device through a first filter, a concentrated water outlet of the first concentration device is connected with a second concentration device through a hardness and impurity removing device, a concentrated water outlet of the second concentration device is connected with a third concentration device through an organic matter removing device and a decarburization device which are connected in series, a nanofiltration device is connected onto the concentrated water outlet of the third concentration device, a nanofiltration water production outlet and a nanofiltration concentrated water outlet are arranged on the nanofiltration device, a water production BPED device is connected onto the nanofiltration water production outlet, and a concentrated water BPED device is connected onto the nanofiltration concentrated water outlet;
and the water production outlets of the first concentrating device, the second concentrating device and the third concentrating device are connected with a reuse water pipe.
Preferably, the hard impurity removing device comprises a high-density pool, a second filter and an ultrafiltration device which are connected in sequence, wherein the high-density pool is connected with a concentrated water outlet of the first concentration device, and the ultrafiltration device is connected with the second concentration device.
Preferably, the first filter and the second filter are both multimedia filters or sand filtration devices.
Preferably, the high-density tank is a high-density sedimentation tank integrating silicon removal and hardness removal.
Preferably, the organic matter removing device is an organic matter removing device for removing organic matters by using advanced catalytic oxidation or electrolysis.
Preferably, the water-producing BPED device and the concentrated water BPED device are both bipolar membrane electrodialysis devices.
Preferably, the nanofiltration device is a butterfly nanofiltration device.
Preferably, the first concentration device, the second concentration device and the third concentration device are reverse osmosis membrane devices, the first concentration device is a butterfly reverse osmosis membrane device, the second concentration device is a roll reverse osmosis membrane device, and the third concentration device is a high-salt reverse osmosis membrane device.
A low-cost resource treatment method for high-salt wastewater in coal chemical industry utilizes a low-cost resource treatment system for high-salt wastewater in coal chemical industry to treat the high-salt wastewater, and comprises the following steps:
(1) introducing the high-salinity wastewater into a high-salinity wastewater homogenizing pool for homogenizing the water quality, controlling TDS to be 4000-6000mg/L, and introducing the high-salinity wastewater subjected to homogenizing treatment into a first filter;
(2) the first filter is pretreated to remove impurity suspended matters, then a first concentration device is used for concentration, the concentration multiplying power is 4 times, the water quantity is reduced to one fourth of that of raw water, and then the raw water enters a high-density pool;
(3) treating in high density pond with double alkali method, controlling pH value in reaction process at 11 + -0.5 by adding medicinal agent according to water quality, and treating CO3 2-The content is controlled within 200-300 mg/L; the sludge reflux proportion of the high-density tank is 10-15%, the pH value of the effluent of the high-density tank is controlled to be 7.5 +/-0.5, and then the effluent enters a second filter and an ultrafiltration device for treatment and then enters a second concentration device, wherein the concentration rate of the second concentration device is 3 times;
(4) the concentrated water of the second concentration device enters an organic matter removal device, the organic matter content of the water produced by the organic matter removal device is less than or equal to 40mg/L, the organic matter degradation index is controlled according to the content and the type of the organic matter, then the concentrated water enters a decarburization device, decarburization is carried out by adding a decarburization agent, and the carbonate content is controlled to be less than or equal to 50 mg/L;
(5) the decarbonized produced water enters a third concentration device, and the concentration multiplying power of the third concentration device is 2 times;
(6) concentrated water of the third concentration device enters a nanofiltration device for treatment, the produced water of the nanofiltration device is sodium chloride, the concentrated water is sodium sulfate, then a water production BPED device and a concentrated water BPED device are utilized to carry out corresponding concentration ratio adjustment according to the content proportion of chloride ions and sulfate radicals in water quality, bidirectional concentration is controlled, the water production BPED device produces hydrochloric acid and a sodium hydroxide solution, and the concentrated water enters the concentrated water BPED device to produce sulfuric acid and a sodium hydroxide solution.
The method comprises the steps of reducing the water quantity to one fourth by utilizing a first concentration device after pretreatment, then carrying out step-by-step pretreatment, carrying out advanced treatment on impurities, scaling ions, organic matters and miscellaneous salts to obtain a salt solution with the main components of sodium sulfate and sodium chloride, concentrating and separating by a nanofiltration device to obtain a sodium sulfate solution and a sodium chloride solution with higher purity, and finally preparing acid-base by bipolar membrane electrodialysis. The invention has the advantages of simple operation, good treatment effect, low operation cost and the like.
Drawings
FIG. 1 is a schematic view of a low-cost recycling treatment system for high-salinity wastewater in coal chemical industry.
Reference numerals: 1-high-salinity wastewater homogenizing pool, 2-first filter, 3-first concentrating device, 4-high-density pool, 5-second filter, 6-ultrafiltration device, 7-second concentrating device, 8-organic matter removing device, 9-decarbonization device, 10-third concentrating device, 11-nanofiltration device, 12-water production BPED device, 13-concentrated water BPED device, 14-medicament, 15-reuse water pipe and 16-decarbonization medicament.
Detailed Description
The invention relates to a low-cost recycling treatment system for high-salinity wastewater in coal chemical industry, which comprises a high-salinity wastewater homogenizing pool 1, a first concentration device 3, a second concentration device 7 and a third concentration device 10, wherein a water production outlet and a concentrated water outlet are formed in each of the first concentration device 3, the second concentration device 7 and the third concentration device 10;
the high-salinity wastewater homogenizing tank 1 is connected with a first concentration device 3 through a first filter 2, a concentrated water outlet of the first concentration device 3 is connected with a second concentration device 7 through a hardness and impurity removing device, a concentrated water outlet of the second concentration device 7 is connected with a third concentration device 10 through an organic matter removing device 8 and a decarburization device 9 which are connected in series, a nanofiltration device 11 is connected onto a concentrated water outlet of the third concentration device 10, a nanofiltration water production outlet and a nanofiltration concentrated water outlet are arranged on the nanofiltration device 11, a water production BPED device 12 is connected onto the nanofiltration water production outlet, and a concentrated water filtration BPED device 13 is connected onto the nanofiltration concentrated water outlet;
and the water production outlets of the first concentration device 3, the second concentration device 7 and the third concentration device 10 are connected with a reuse water pipe 15.
The hard impurity removing device comprises a high-density pool 4, a second filter 5 and an ultrafiltration device 6 which are sequentially connected, wherein the high-density pool 4 is connected with a concentrated water outlet of the first concentration device 3, and the ultrafiltration device 6 is connected with a second concentration device 7.
The first filter 2 and the second filter 5 are both multi-media filters or sand filtration devices.
The high-density tank 4 is a high-density sedimentation tank integrating silicon removal and hardness removal.
The organic matter removal device 8 is an organic matter removal device 8 for removing organic matters by advanced catalytic oxidation or electrolysis.
The water production BPED device 12 and the concentrated water BPED device 13 are both bipolar membrane electrodialysers.
The nanofiltration device 11 is a butterfly nanofiltration device 11.
The first concentration device 3, the second concentration device 7 and the third concentration device 10 are all reverse osmosis membrane devices, the first concentration device 3 is a butterfly reverse osmosis membrane device, the second concentration device 7 is a roll reverse osmosis membrane device, and the third concentration device 10 is a high-salt reverse osmosis membrane device.
A low-cost resource treatment method for high-salt wastewater in coal chemical industry utilizes a low-cost resource treatment system for high-salt wastewater in coal chemical industry to treat the high-salt wastewater, and comprises the following steps:
(1) introducing the high-salinity wastewater into a high-salinity wastewater homogenizing pool 1 for homogenizing the water quality, controlling TDS to be 4000-;
(2) the first filter 2 is pretreated to remove impurity suspended matters, then a first concentration device 3 is used for concentration, the concentration rate is 4 times, the water quantity is reduced to one fourth of the original water, and then the water enters a high-density pool 4;
(3) treating in high density tank 4 by double alkali method, controlling pH value in reaction process at 11 + -0.5 by adding chemical 14 according to water quality, and adding CO3 2-The content is controlled within 200-300 mg/L; the sludge reflux proportion of the high-density tank 4 is 10-15%, and the pH value of the effluent of the high-density tank 4 isThe value is controlled to be 7.5 +/-0.5, and then the mixture enters a second filter 5 and an ultrafiltration device 6 for treatment and then enters a second concentration device 7, wherein the concentration multiplying power of the second concentration device 7 is 3 times;
(4) concentrated water of the second concentration device 7 enters an organic matter removal device 8, the content of organic matters in water produced by the organic matter removal device 8 is less than or equal to 40mg/L, the degradation index of the organic matters is controlled according to the content and the type of the organic matters, then the concentrated water enters a decarburization device 9, decarburization is carried out by adding a decarburization agent 16, and the content of carbonate is controlled to be less than or equal to 50 mg/L;
(5) the decarbonized produced water enters a third concentration device 10, and the concentration ratio of the third concentration device 10 is 2 times;
(6) concentrated water of the third concentration device 10 enters a nanofiltration device 11 for treatment, water produced by the nanofiltration device 11 is sodium chloride, the concentrated water is sodium sulfate, then a water production BPED device 12 and a concentrated water BPED device 13 are utilized to perform corresponding concentration ratio adjustment according to the content proportion of chloride ions and sulfate radicals in water, bidirectional concentration is controlled, the water production BPED device 12 produces hydrochloric acid and a sodium hydroxide solution, and the concentrated water enters the concentrated water BPED device 13 to produce sulfuric acid and a sodium hydroxide solution.
Example 1
The device front end is come the water and is got into misce bene in the high salt waste water homogeneity pond 1, it gets into the concentrated decrement of butterfly reverse osmosis membrane device to go into behind first filter 2, the dense water of butterfly reverse osmosis membrane device gets into high density pond 4, it removes the hardness to add medicament 14 in high density pond, product water is squeezed into second filter 5, follow-up ultrafiltration device 6 that gets into, it is concentrated to get into formula reverse osmosis membrane device after detaching impurity and suspended solid, dense water gets into organic matter removing device 8 and decarbonization device 9, it is concentrated to follow-up entering butterfly reverse osmosis membrane device, dense water gets into butterfly nanofiltration device 11 and becomes product water and dense water with moisture, product water gets into product water BPED device 12, dense water gets into dense water BPED device 13.
After being homogenized, high-salinity wastewater entering the system is pretreated by a first filter 2 and then concentrated and reduced by using a butterfly reverse osmosis membrane device, a high-density pool 4 is a high-density sedimentation pool integrating silicon removal and hardness removal, a second filter 5 and an ultrafiltration device 6 are followed to remove hardness and impurities, the first filter 2 and the second filter 5 are multi-medium filters, a second concentration device 7 is a roll reverse osmosis membrane device and is concentrated, concentrated water produced by the roll reverse osmosis membrane device is subjected to deep treatment by an organic matter removal device 8 and a decarburization device 9, and concentrated organic matters and carbonate and bicarbonate radicals added due to hardness removal of the high-density pool are respectively removed; the electrolytic removal organic matter device that organic matter remove device 8 used, third enrichment facility 10 are high salt reverse osmosis membrane device, carry out the reconcentration to the dense water, butterfly nanofiltration device 11 separates monovalent chloride ion and bivalent sulfate radical ion in the dense water, the BPED device is bipolar membrane electrodialysis, produces water BPED device 12 output hydrochloric acid and sodium hydroxide solution, the dense water gets into dense water BPED device 13 output sulphuric acid and sodium hydroxide solution. The produced water of the first concentration device 3, the second concentration device 7 and the third concentration device 10 is recycled water which can be recycled as reclaimed water.
Example 2
The quality of high salt waste water of a certain coal chemical plant, wherein: TDS is 5000mg/L, COD is 80mg/L, the ratio of sodium chloride to sodium sulfate is 6:4, and the pH value is 7.5.
The treatment method comprises the following steps:
introducing the high-salinity wastewater into a high-salinity wastewater homogenizing pool 1 for water quality homogenization, controlling TDS at 4000-;
after pretreatment is carried out on the multi-media filter, impurity suspended matters are removed, and then concentration is carried out by 4 times by using a butterfly reverse osmosis membrane device, so that the water quantity is reduced to one fourth of the original water, and the salt content is about 20000 mg/L;
treating in high density tank 4 by double alkali method, controlling pH value in reaction process at 11 + -0.5 according to water quality, and treating CO3 2-The content is controlled at 200-300 mg/L; the sludge reflux ratio in the high-density tank 4 is 10-15%, and the pH value of the effluent is controlled to be 7.5 +/-0.5.
The concentration multiplying power of the rolled reverse osmosis membrane device is 3 times, and the TDS of the effluent is about 60000 mg/L;
the organic matter content of the water produced by the organic matter removing device 8 is less than or equal to 40mg/L, the organic matter degradation index is controlled according to the content and the type of the organic matter, the decarbonizing device 9 is used for decarbonizing by adding a decarbonizing agent 16, and the carbonate content is controlled to be less than or equal to 50 mg/L;
the concentration multiplying power of the high-salt reverse osmosis membrane device is 2 times of concentration, and the TDS of the concentrated water is about 12000 mg/L;
the nanofiltration device 11 is a butterfly nanofiltration device 11, the produced water is sodium chloride, the concentrated water is sodium sulfate, corresponding concentration ratio adjustment is carried out according to the content ratio of chloride ions and sulfate radicals in the water, bidirectional concentration is controlled, the recovery rate of the sodium chloride in the produced water is not less than 98%, and the recovery rate of the sulfate radicals in the concentrated water is not less than 90%.
The concentration of hydrochloric acid and sulfuric acid produced by the BPED device is 5-8%, the concentration of sodium hydroxide is 5-8%, and subsequent concentration can be carried out again to ensure that the concentration of the product reaches 20%.
According to the invention, after pretreatment, the water amount is reduced to one fourth by using a first concentration device 3, then step-by-step pretreatment is carried out, impurities, scaling ions, organic matters and miscellaneous salts are subjected to advanced treatment to obtain a salt solution with main components of sodium sulfate and sodium chloride, a sodium sulfate solution and a sodium chloride solution with higher purity are obtained after concentration and separation by a nanofiltration device 11, and finally acid and alkali are prepared by bipolar membrane electrodialysis. The invention has the advantages of simple operation, good treatment effect, low operation cost and the like.
Claims (9)
1. The low-cost recycling treatment system for the high-salinity wastewater in the coal chemical industry is characterized by comprising a high-salinity wastewater homogenizing pool (1), a first concentration device (3), a second concentration device (7) and a third concentration device (10), wherein the first concentration device (3), the second concentration device (7) and the third concentration device (10) are respectively provided with a water production outlet and a concentrated water outlet;
the high-salinity wastewater homogenizing tank (1) is connected with a first concentration device (3) through a first filter (2), a concentrated water outlet of the first concentration device (3) is connected with a second concentration device (7) through a hardness and impurity removing device, a concentrated water outlet of the second concentration device (7) is connected with a third concentration device (10) through an organic matter removing device (8) and a decarburization device (9) which are connected in series, a nanofiltration device (11) is connected to a concentrated water outlet of the third concentration device (10), a nanofiltration water production outlet and a nanofiltration concentrated water outlet are arranged on the nanofiltration device (11), a water production BPED device (12) is connected to the nanofiltration water production outlet, and a concentrated water BPED device (13) is connected to the nanofiltration concentrated water outlet;
and water production outlets of the first concentration device (3), the second concentration device (7) and the third concentration device (10) are connected with a reuse water pipe (15).
2. The low-cost recycling treatment system for the high-salinity wastewater in the coal chemical industry according to claim 1, wherein the hardness and impurity removal device comprises a high-density tank (4), a second filter (5) and an ultrafiltration device (6) which are connected in sequence, the high-density tank (4) is connected with a concentrated water outlet of the first concentration device (3), and the ultrafiltration device (6) is connected with the second concentration device (7).
3. The coal chemical industry high-salinity wastewater low-cost recycling treatment system according to claim 2, characterized in that the first filter (2) and the second filter (5) are both multi-media filters or sand filtration devices.
4. The low-cost resource treatment system for the high-salinity wastewater in the coal chemical industry according to claim 3, characterized in that the high-density tank (4) is a high-density sedimentation tank integrating silicon removal and hardness removal.
5. The coal chemical industry high-salt wastewater low-cost resource treatment system according to claim 4, characterized in that the organic matter removal device (8) is an organic matter removal device (8) for removing organic matters by advanced catalytic oxidation or electrolysis.
6. The low-cost resource treatment system for the high-salinity wastewater in the coal chemical industry according to claim 6, wherein the water production BPED device (12) and the concentrated water BPED device (13) are bipolar membrane electrodialysis devices.
7. The coal chemical industry high-salinity wastewater low-cost resource treatment system according to claim 6, characterized in that the nanofiltration device (11) is a butterfly nanofiltration device (11).
8. The low-cost recycling treatment system for the high-salt wastewater in the coal chemical industry according to any one of claims 1 to 7, wherein the first concentration device (3), the second concentration device (7) and the third concentration device (10) are all reverse osmosis membrane devices, the first concentration device (3) is a butterfly reverse osmosis membrane device, the second concentration device (7) is a roll reverse osmosis membrane device, and the third concentration device (10) is a high-salt reverse osmosis membrane device.
9. A low-cost resource treatment method for high-salt wastewater in coal chemical industry, which utilizes the low-cost resource treatment system for high-salt wastewater in coal chemical industry as claimed in claim 2 to treat the high-salt wastewater, and is characterized by comprising the following steps:
(1) introducing the high-salinity wastewater into a high-salinity wastewater homogenizing pool (1) for water quality homogenization, controlling TDS to be 4000-;
(2) the first filter (2) is pretreated to remove impurity suspended matters, then a first concentration device (3) is used for concentration, the concentration multiplying power is 4 times, the water quantity is reduced to one fourth of the original water, and then the water enters a high-density pool (4);
(3) treating in high density tank (4) by double alkali method, controlling pH value in reaction process at 11 + -0.5 by adding agent (14) according to water quality, and adding CO3 2-The content is controlled within 200-300 mg/L; the sludge reflux proportion of the high-density tank (4) is 10-15%, the pH value of the effluent of the high-density tank (4) is controlled to be 7.5 +/-0.5, the effluent enters a second filter (5) and an ultrafiltration device (6) for treatment and then enters a second concentration device (7), and the concentration rate of the second concentration device (7) is 3 times;
(4) concentrated water of the second concentration device (7) enters an organic matter removal device (8), the organic matter content of water produced by the organic matter removal device (8) is less than or equal to 40mg/L, organic matter degradation indexes are controlled according to the content and the type of the organic matter, then the water enters a decarburization device (9), decarburization is carried out by adding a decarburization agent (16), and the carbonate content is controlled to be less than or equal to 50 mg/L;
(5) the decarbonized produced water enters a third concentration device (10), and the concentration multiplying power of the third concentration device (10) is 2 times;
(6) concentrated water of the third concentration device (10) enters a nanofiltration device (11) for treatment, water produced by the nanofiltration device (11) is sodium chloride, the concentrated water is sodium sulfate, then a water production BPED device (12) and a concentrated water BPED device (13) are utilized to carry out corresponding concentration ratio adjustment according to the content ratio of chloride ions and sulfate radicals in water quality, bidirectional concentration is controlled, the water production BPED device (12) produces hydrochloric acid and a sodium hydroxide solution, and the concentrated water enters the concentrated water BPED device (13) to produce sulfuric acid and a sodium hydroxide solution.
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Citations (4)
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| CN105800885A (en) * | 2016-05-23 | 2016-07-27 | 北京今大禹环境技术股份有限公司 | Resource recycling and treatment system of high-concentration degradation-resistant salt-containing organic waste water |
| CN106396228A (en) * | 2016-09-18 | 2017-02-15 | 内蒙古久科康瑞环保科技有限公司 | Device and method for treating industrial wastewater with high salt content |
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| CN215102340U (en) * | 2021-04-12 | 2021-12-10 | 陕西省石油化工研究设计院 | Low-cost resourceful treatment system of coal industry high salt waste water |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105800885A (en) * | 2016-05-23 | 2016-07-27 | 北京今大禹环境技术股份有限公司 | Resource recycling and treatment system of high-concentration degradation-resistant salt-containing organic waste water |
| CN106396228A (en) * | 2016-09-18 | 2017-02-15 | 内蒙古久科康瑞环保科技有限公司 | Device and method for treating industrial wastewater with high salt content |
| CN209368022U (en) * | 2018-12-23 | 2019-09-10 | 陕西省石油化工研究设计院 | At a kind of coal chemical industry high-salt wastewater zero-emission and recycling treatment system |
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