CN105254100A - System and method for treating sewage containing salt - Google Patents
System and method for treating sewage containing salt Download PDFInfo
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- CN105254100A CN105254100A CN201510696627.XA CN201510696627A CN105254100A CN 105254100 A CN105254100 A CN 105254100A CN 201510696627 A CN201510696627 A CN 201510696627A CN 105254100 A CN105254100 A CN 105254100A
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- 238000000034 method Methods 0.000 title claims abstract description 90
- 239000010865 sewage Substances 0.000 title claims abstract description 42
- 150000003839 salts Chemical class 0.000 title claims abstract description 32
- 230000008569 process Effects 0.000 claims abstract description 83
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000007787 solid Substances 0.000 claims abstract description 26
- 238000001704 evaporation Methods 0.000 claims abstract description 24
- 238000011282 treatment Methods 0.000 claims abstract description 24
- 239000012267 brine Substances 0.000 claims abstract description 12
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 12
- 239000010802 sludge Substances 0.000 claims abstract description 10
- 238000004064 recycling Methods 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims description 27
- 238000004094 preconcentration Methods 0.000 claims description 25
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 24
- 239000011780 sodium chloride Substances 0.000 claims description 24
- 230000008020 evaporation Effects 0.000 claims description 20
- 239000013078 crystal Substances 0.000 claims description 19
- 238000011084 recovery Methods 0.000 claims description 16
- 238000002425 crystallisation Methods 0.000 claims description 12
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 10
- 239000000047 product Substances 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 230000018044 dehydration Effects 0.000 claims description 8
- 238000006297 dehydration reaction Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 238000007781 pre-processing Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 claims description 6
- 238000011105 stabilization Methods 0.000 claims description 6
- 238000001223 reverse osmosis Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 239000011552 falling film Substances 0.000 claims description 4
- 238000005342 ion exchange Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 238000000746 purification Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 239000012286 potassium permanganate Substances 0.000 claims description 3
- 239000000706 filtrate Substances 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000002351 wastewater Substances 0.000 abstract description 4
- 239000004615 ingredient Substances 0.000 abstract 2
- 239000000126 substance Substances 0.000 description 11
- 208000028659 discharge Diseases 0.000 description 10
- 239000004912 1,5-cyclooctadiene Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 230000008025 crystallization Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000010408 film Substances 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 239000008235 industrial water Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000011143 downstream manufacturing Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000006002 Pepper Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Abstract
The invention discloses a system and method for treating sewage containing salt. The system comprises a pretreating unit, a pre-concentrating unit, an evaporating unit, a crystallizing unit, a condensate fine treating unit and a solid ingredient treating and recycling unit. When pretreating is carried out, the sewage which is to be treated and contains salt is introduced, and waste water and sludge are generated after treatment; pure water and concentrated water are generated in the pre-concentrating process; condensate and strong brine are generated in the evaporating process; condensate and crystallized salt are generated in the crystallizing process, the pure water and the condensate are subjected to a condensate fine treating process, and the sludge and crystallized salt are subjected to a solid ingredient treating and recycling process; recycling water is generated in the condensate fine treating process. By means of the system, customized process selection can be carried out according to different demands, swage discharge to an adjacent water body can be completely eliminated, moisture can be recycled to the maximum degree, high-purity softened water can be obtained to the maximum degree, energy consumption is low, and resource recycling of the salt can be achieved.
Description
Technical field
The present invention relates to sewage treatment area, particularly, relate to a kind of zero-discharge treatment system and the method that are used in oil refining saline sewage, petrochemical complex saline sewage, Coal Chemical Industry saline sewage, means of flue gas desulfurization of power plant sewage, Wastewater Form Circulating Cooling Water, mining sewage and oil gas recovered water etc., belong to Industrial Waste Water Treatments field.
Background technology
Current, some ground unit shortage of water resources of China, quality of water environment are poor, the impaired problem such as heavy of Ecology is very outstanding, are unfavorable for economic society sustainable development.According to statistics, industrial water withdrawal in 2013 accounts for 25% of the total water withdrawal in the whole nation, and wherein the high water usage high pollution discharge industry water withdrawal such as thermoelectricity, iron and steel, weaving, papermaking, petrochemical industry and chemical industry accounts for about 50% of industrial water withdrawal.For strengthening energy-saving and emission-reduction further, " national environmental protection " 12 " planning " that State Council has promulgated in December, 2011 clearly encourages enterprise to implement stain disease " zero release " measure in electric power, petroleum and petrochemical industry, the contour water consumption industry of Coal Chemical Industry.In April, 2015, State Council up-to-dately promulgated " water prevention and cure of pollution action plan " (" ten, water "), Industrial Water Saving is done a good job of it in requirement, encourages iron and steel, textile printing and dyeing, papermaking, petroleum and petrochemical industry, chemical industry, process hides contour water consumption enterprise wastewater advanced treatment and reclamation; Accelerate technological achievement to apply, emphasis promotes the Appropriate technologies such as water saving, water pollution control and recycle; Capture the foresight technologies such as the industrial high slat-containing wastewater desalination of research and development.
The water quality characteristic of the industrial saline sewage such as oil refining, petrochemical industry, Coal Chemical Industry, flue gas desulfurization is the features such as supersalinity, high COD, high rigidity, high fluoride, high silicon, high heavy metal, and intractability is large.
The domestic sewage zero-discharge treatment system generally adopted generally comprises the steps such as pre-treatment, membrane concentration, evaporation, crystallization at present.In above-mentioned existing treatment system, pre-treatment mainly adopts conventional coagulating sedimentation+softening except hard+filtration process, this pretreatment technology treatment effect is not high, energy consumption is high, it is larger to take up an area, the most important thing is the technological measure not removing high COD in former water, thus cause downstream film upgrading unit and the fouling of evaporative crystallization unit serious, go out salt poor quality, be difficult to the steady running ensureing downstream units; Conventional efficient reverse osmosis membrane upgrading unit needs higher matting frequency and causes clean water production rate to decline, and film replacement frequency is high, and working cost is high; Evaporative crystallization, to produce mixed salt, really can not accomplish the technical purity grade simple substance salt isolating high-quality, and do not accomplish that simple substance salt resource utilization is recycled, follow-up landfill stabilization costly; The phlegma that system produces still containing higher COD, ammonia nitrogen etc., directly can not carry out reuse as process water.
Summary of the invention
Based on the deficiency existing for above-mentioned prior art and defect, the invention provides one, effectively solve and realize industrial sewage zero release problem.
In order to solve the problems of the technologies described above, the invention provides following technical scheme:
A kind of saline sewage treatment system, this system comprises the pretreatment unit of connection, pre-concentration unit, evaporation element, crystalline element, phlegma precision processing unit and solids component process recovery unit, it is characterized in that, described pretreatment unit is provided with saline sewage water-in, sewage outlet and sludge outlet, pre-concentration unit described in pretreatment unit sewage outlet connects, pre-concentration unit is provided with and produces water water outlet and dense water water outlet, evaporation element described in dense water water outlet connects, evaporation element is provided with the first condensate outlet and strong brine outlet, crystalline element described in strong brine outlet connects, crystalline element is provided with the second condensate outlet and crystal salt outlet, pre-concentration unit produces water water outlet, first condensate outlet, and second condensate outlet connect described in the water-in of phlegma precision processing unit, phlegma precision processing unit is also provided with reuse water water outlet, solids component process recovery unit described in pretreatment unit sludge outlet is connected with the outlet of crystalline element crystal salt, solids component process recovery unit is respectively equipped with import and the outlet of mud and crystal salt.
Further, described pretreatment unit comprises DENSADEG potassium permanganate composites, AQUAZURV type filter tank and/or OXYBLUE advanced oxidation subelement and SMARTRACK ultrafilter unit.
Further, described pre-concentration unit is provided with reverse osmosis membrane concentration system.
Further, described evaporation element is provided with falling film evaporation system.
Further, described crystalline element is provided with the pump circulation crystal system that product or mix suspending classification discharge product are discharged in mix suspending mixing.
Further, described phlegma precision processing unit comprises activated carbon filtration subelement and/or air lift subelement and/or ion-exchange subelement.
Further, described solids component process recovery unit comprises filter press dehydration subelement, centrifuge dehydration subelement, dry subelement.
Also provide a kind of saline sewage treatment process, comprise following treating processes, preprocessing process, pre-concentration process, evaporative process, crystallisation process, phlegma precision processing process and solids component process removal process, is characterized in that,
Access pending saline sewage in described preprocessing process, produce sewage and mud after process, the sewage that preprocessing process produces carries out pre-concentration process, and mud carries out solids component process removal process;
Pre-concentration process produces water purification and dense water, and water purification carries out phlegma precision processing process, and dense water carries out evaporative process;
Evaporative process produces phlegma and strong brine, and phlegma carries out phlegma precision processing process, and strong brine carries out crystallisation process;
Crystallisation process produces phlegma and crystal salt, and phlegma carries out phlegma precision processing process, and crystal salt carries out solids component process removal process;
Phlegma precision processing process produces reuse water.
Beneficial effect of the present invention:
1, whole process total solution realizes saline sewage zero release, eliminates the sewage discharge to contiguous water body completely;
2, according to different demands, carry out customization process optimization and select;
3, the high efficient technology combination in pretreatment unit to the full extent to the removal of the pollutents such as suspended substance, hardness, fluorochemical, heavy metal and COD, can ensure down stream process units steady running;
4, stable reverse osmosis membrane pre-concentration unit guarantees low matting frequency, low film replacement cycle, high availability and low working cost;
5, the falling-film evaporating unit of efficient, less energy-consumption, can to the full extent to the further evaporation concentration of salt solution;
6, the crystalline element adopting mix suspending mixing to discharge the pump circulation crystal system of product (MSMPR) or mix suspending classification discharge product (MSCPR) can realize mixed salt crystallization or simple substance salt-pepper noise flexibly, and the resource utilization realizing salinity is recycled;
7, phlegma precision processing unit can guarantee that obtaining highly purified softening water carries out technique reuse;
8, total system have contaminant removal efficiency high, take up an area compact, automatization level is high, stable, invest the advantages such as low, working cost is low.
Accompanying drawing explanation
Fig. 1 is a kind of saline sewage zero-discharge treatment system structural representation.
1-pretreatment unit; 2-pre-concentration unit; 3-evaporation element; 4-crystalline element; 5-phlegma precision processing unit; The process of 6-solids component and recovery unit.
Embodiment
Being described the preferred embodiments of the present invention below in conjunction with accompanying drawing, should be appreciated that embodiment described herein is only for instruction and explanation of the present invention, is only the present invention's part embodiment, instead of whole embodiments, is not intended to limit the present invention.
As shown in Figure 1, the embodiment of the present invention provides a kind of saline sewage zero discharge treatment total solution system S.M.A.R.T.ZONES
tM, this system comprises the pretreatment unit 1 of connection, pre-concentration unit 2, evaporation element 3, crystalline element 4, phlegma precision processing unit 5 and solids component process and recovery unit 6.
Pretreatment unit 1 is provided with water-in, water outlet and sludge outlet; Pretreatment unit 1 water outlet connects pre-concentration unit 2, and pre-concentration unit 2 is provided with and produces water out and dense water out, and the dense water out of pre-concentration unit connects evaporation element 3; Evaporation element 3 is provided with condensate outlet and strong brine outlet, and strong brine outlet connects crystalline element 4; Crystalline element 4 is provided with condensate outlet and the outlet of crystal salt slurry; Product water out, the above-mentioned evaporation element 3 of pre-concentration unit 2 are connected phlegma precision processing unit 5 with the condensate outlet of crystalline element 4, and phlegma precision processing unit 5 is provided with water-in and water outlet; The sludge outlet of above-mentioned pretreatment unit 1 is connected solids component process and recovery unit 6 with the crystal salt slurry outlet of crystalline element 4, and solids component process and recovery unit 6 are respectively equipped with import and the outlet of mud and crystal salt;
Pretreatment unit 1 be provided with integrate coagulation, flocculation, clarification precipitation concentration and soften comprise DENSADEG potassium permanganate composites; Constant speed, permanent water level, fill homogeneous filtering material, fully automatic operation AQUAZURV type filter tank and/or with the OXYBLUE advanced oxidation unit of ozone oxidation and biological filter combination and SMARTRACK ultrafiltration etc., effectively remove suspended substance, hardness, fluorochemical, heavy metal, silicon and COD etc. to reach, thus ensure the steady running of down stream process units unit;
The reverse osmosis membrane concentration system of the high reliability that pre-concentration unit 2 is provided with, low cleaning frequency, low film turnover rate, ensures that the de-salted water of system produce high-quality carries out reusing sewage;
The falling film evaporation system of the high and low energy consumption of the heat transfer efficiencies that evaporation element 3 is provided with, to the further evaporation concentration of strong brine that pre-concentration unit 2 is discharged, salinity is crystallized out at the crystalline element 4 in downstream, reduces the design and running scale of crystal system simultaneously;
The pump circulation crystal system of product (MSMPR) or mix suspending classification discharge product (MSCPR) is discharged in the mix suspending mixing that crystalline element 4 is provided with, mixed salt or simple substance salt can be gone out according to different demand crystallizations, and finally carry out landfill stabilization or resource utilization recycling;
The activated carbon filtration that phlegma precision processing unit 4 is provided with and/or air lift and/or ion exchange process unit, to the further precision processing of phlegma that evaporation element 3 and crystalline element 4 produce, remove the COD, ammonia nitrogen, total dissolved solid etc. that contain in phlegma, meet the technique reuse requirement of higher standard;
The mud that pretreatment unit 1 produces delivers to solids component process and recovery unit 6, and adopt filter press or whizzer to carry out deep dehydration, the filtrate of generation is back to the further circular treatment of pretreatment unit water-in again, and dewatered sludge can send landfill stabilization outside; The salt slurry that crystalline element 4 produces delivers to solids component process and recovery unit 6, employing push-type centrifuge, drying machine carry out deep dehydration and drying, the mixed salt of final generation can send landfill stabilization outside, and point salt of the high-quality technical grade purity of generation can carry out resource utilization recycling.
Last it is noted that the foregoing is only embodiments of the invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a saline sewage treatment system, this system comprises the pretreatment unit of connection, pre-concentration unit, evaporation element, crystalline element, phlegma precision processing unit and solids component process recovery unit, it is characterized in that, described pretreatment unit is provided with saline sewage water-in, sewage outlet and sludge outlet, pre-concentration unit described in pretreatment unit sewage outlet connects, pre-concentration unit is provided with and produces water water outlet and dense water water outlet, evaporation element described in dense water water outlet connects, evaporation element is provided with the first condensate outlet and strong brine outlet, crystalline element described in strong brine outlet connects, crystalline element is provided with the second condensate outlet and crystal salt outlet, pre-concentration unit produces water water outlet, first condensate outlet, and second condensate outlet connect described in the water-in of phlegma precision processing unit, phlegma precision processing unit is also provided with reuse water water outlet, solids component process recovery unit described in pretreatment unit sludge outlet is connected with the outlet of crystalline element crystal salt, solids component process recovery unit is respectively equipped with import and the outlet of mud and crystal salt.
2. a kind of saline sewage treatment system according to claim 1, is characterized in that, described pretreatment unit comprises potassium permanganate composites, V-type filter tank and/or advanced oxidation subelement and ultrafilter unit.
3. a kind of saline sewage treatment system according to claim 1, is characterized in that, described pre-concentration unit is provided with reverse osmosis membrane concentration system.
4. a kind of saline sewage treatment system according to claim 1, it is characterized in that, described evaporation element is provided with falling film evaporation system.
5. a kind of saline sewage treatment system according to claim 1, is characterized in that, described crystalline element is provided with the pump circulation crystal system that product or mix suspending classification discharge product are discharged in mix suspending mixing.
6. a kind of saline sewage treatment system according to claim 1, is characterized in that, described phlegma precision processing unit comprises activated carbon filtration subelement and/or air lift subelement and/or ion-exchange subelement.
7. a kind of saline sewage treatment system according to claim 1, is characterized in that, described solids component process recovery unit comprises filter press dehydration subelement, centrifuge dehydration subelement, dry subelement.
8. a saline sewage treatment process, comprises following treating processes, and preprocessing process, pre-concentration process, evaporative process, crystallisation process, phlegma precision processing process and solids component process removal process, is characterized in that,
Access pending saline sewage in described preprocessing process, produce sewage and mud after process, the sewage that preprocessing process produces carries out pre-concentration process, and mud carries out solids component process removal process;
Pre-concentration process produces water purification and dense water, and water purification carries out phlegma precision processing process, and dense water carries out evaporative process;
Evaporative process produces phlegma and strong brine, and phlegma carries out phlegma precision processing process, and strong brine carries out crystallisation process;
Crystallisation process produces phlegma and crystal salt, and phlegma carries out phlegma precision processing process, and crystal salt carries out solids component process removal process;
Phlegma precision processing process produces reuse water.
9. a kind of saline sewage treatment process according to claim 8, it is characterized in that, phlegma precision processing process also comprises activated carbon filtration subprocess and/or air lift subprocess and/or ion-exchange subprocess, to the further precision processing of phlegma, remove the COD, ammonia nitrogen, the total dissolved solid that contain in phlegma.
10. a kind of saline sewage treatment process according to claim 8, it is characterized in that, when the mud that preprocessing process produces carries out solids component process recovery, filter press or whizzer is adopted to carry out deep dehydration, the filtrate produced is back to the further circular treatment of pretreatment unit water-in again, and dewatered sludge sends landfill stabilization outside; When row solids component process recovery sent to by the crystal salt slurry that crystallisation process produces, employing push-type centrifuge, drying machine carry out deep dehydration and drying, landfill stabilization sent outside by the mixed salt produced, and point salt of the high-quality technical grade purity of generation carries out resource utilization recycling.
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| CN110330165A (en) * | 2019-06-05 | 2019-10-15 | 中国石油天然气集团有限公司 | Strong brine zero-emission and sub-prime crystallizing treatment process and processing system |
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| CN105254100B (en) | 2018-06-08 |
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