CN102701303A - Liquid-film low-temperature-evaporation zero-emission saline wastewater treatment method - Google Patents
Liquid-film low-temperature-evaporation zero-emission saline wastewater treatment method Download PDFInfo
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- 238000001704 evaporation Methods 0.000 title claims abstract description 35
- 238000004065 wastewater treatment Methods 0.000 title abstract description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 title abstract 5
- 239000011780 sodium chloride Substances 0.000 title abstract 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 78
- 239000007788 liquid Substances 0.000 claims abstract description 76
- 230000008020 evaporation Effects 0.000 claims abstract description 30
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- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 34
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- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a negative-pressure liquid-film low-temperature-evaporation zero-emission saline wastewater treatment method. The negative-pressure liquid-film low-temperature-evaporation zero-emission saline wastewater treatment method comprises the following steps: after being subjected to pretreatment and temperature regulation, saline wastewater is uniformly dispensed onto a porous water dispensing plate in an evaporation chamber by a dispensing water tank, wherein holes and bulges on the porous water dispensing plate form a negative-pressure liquid film generator and a negative pressure is formed in a cavity on the lower part, so that air entering the evaporation chamber sufficiently contacts liquid in a liquid film to form saturated steam; the saturated steam is discharged out of the evaporation chamber by a draught fan and sent to a vapor recycling tower, and evaporated water is recycled; a concentrated solution is collected by a concentrated solution circulating water tank, and returns to the dispensing water tank for circulating concentration, or returns to a regulating tank for heat compensation; and when the concentrated solution reaches or approaches a saturated state, the concentrated solution is gradually discharged by a discharge valve, a solid solution is separated out and supernatant after precipitation returns to the regulating tank for repeated concentration. In the negative-pressure liquid-film low-temperature-evaporation zero-emission saline wastewater treatment method, materials are concentrated in an approximately natural state, the boiling point and air circulation are reduced by negative pressure, moisture evaporation is promoted, zero-emission treatment of high-salinity wastewater is realized, and requirements on reuse and zero emission of industrial wastewater are met.
Description
Technical field
The invention belongs to the technology for treating industrial waste water field, relate to a kind of treatment process of high slat-containing wastewater, particularly relate to a kind of Zero discharge treatment method of negative pressure liquid film low-temperature evaporation technical finesse brine waste of high-efficiency low energy consumption.
Background technology
Shortage of water resources has become the important factor of restriction China's economy and social development, and industrial water withdrawal accounts for 20% of national water withdrawal.In recent years, industries such as China's Coal Chemical Industry, salt chemical engineering, medicine, petrochemical industry are very active, and production capacity significantly rises, and the wastewater flow rate that thereupon produces also increases rapidly.The characteristics that these industries produce waste water are that concentration height, strong toxicity, saltiness are big; Therefore difficulty of governance is bigger, and particularly in the shortage of water resources area, the waste water comprehensive reutilization is limited by supersalinity; After through art breading such as embrane method or flash distillations; The high strong brine that produces can not properly be disposed, and takes the directly mode of discharging mostly, and local water surrounding is polluted.
For further strengthening the industry water saving; Alleviate the imbalance between supply and demand of China's water resources; The containment water environment degradation promotes the coordinated development of industrial economy and water resources and environment, and " Chinese water-saving technology policy outline " proposes the requirement of reuse of development efflux wastewater and " zero release " technology." zero release " (ZLD of trade effluent; Zero Liquid Discharge) technology is physics, chemistry or biological processes such as integrated application membrane sepn, evaporative crystallization and/or drying; Solid impurity in the waste water is concentrated into very high density, and most of water returns cyclically utilizing, the remaining water of following solid waste on a small quantity; Further adopt solidification treatment such as crystallization, evaporation, solid waste absorption, or burn, bury etc.
Along with the pay attention to day by day of China to environment protection; Cycling utilization of wastewater is applied in key industrys such as iron and steel, electric power, chemical industry, coals; Require gradually high strong brine is properly disposed; Satisfy the requirements or the area of shortage of water resources, the water resources that should reach efflux wastewater reuse and zero release is utilized degree.
" zero release " technology adopts reverse osmosis membrane (RO) usually, electrodialysis (EDR), and after technology such as ultrafiltration (UF) and membrane reactor (MBR) technology were fully recycled factory effluent, remaining technologies such as high slat-containing wastewater employing evaporation recycled.After high slat-containing wastewater is handled through evaporation technology, the water of general recyclable 90%-95%.The key of " zero release " technology is evaporation (or other processing) treatment technology of high strong brine.
Zero-discharge technology is taken as the leading factor with the crystal seed method of U.S. GE company at present, and the environmental protection company of states such as Australia, Germany also develops zero-discharge technology in succession simultaneously.China's zero-discharge technology is also taken as the leading factor with MSF at present, but investment and running cost are high, and the integral body last effect can not reach expection.According to investigation, crystal seed method is invested up to about 1,500,000 yuan of/ton water, about the about 60-100 unit/ton of running cost water.
Therefore, the high slat-containing wastewater evaporation technique of the less energy-consumption that exploiting economy is feasible is realized industrial effluent reusing and " zero release " technology, can effectively alleviate the investment and the operating pressure of environmental protection facilities of the enterprise, improves water resource environment greatly.
Summary of the invention
The purpose of this invention is to provide a kind of negative pressure liquid film low-temperature evaporation formula brine waste Zero discharge treatment method; Can improve the air water contact efficiency through film forming, through step-down and air cycle near under the natural condition; Reduce the boiling point of brine waste; Improve the humidity of air under the natural condition and the moisture in the saturated air, thereby strengthen the aqueous vapor evaporation, brine waste is concentrated.Because negative pressure liquid film low-temperature evaporation formula zero discharge treatment technology of the present invention is near concentrating material under the state of nature, compares with crystal seed method, investment and running cost all reduce significantly.
The technical scheme that the present invention adopted is:
A kind of negative pressure liquid film low-temperature evaporation formula brine waste Zero discharge treatment method comprises the steps:
1), is promoted to through the brine waste of stoste lift pump (5) after and distributes water tank (6) adjustment temperature in the equalizing tank (2); Be evenly distributed on the porous water distribution board (19) of downward-sloping setting in the evaporator room (14); Described porous water distribution board (19) is gone up and is arranged negative pressure liquid film producer (9), is made up of the convexity of hole on the porous water distribution board (19) and top, hole;
2), brine waste is gone up at porous water distribution board (19) and is formed liquid film; The hole is formed at negative pressure liquid film producer (9) bottom; Air is from getting into evaporator room (14) from blast inlet (8); The air that gets into evaporator room (14) gets into liquid film from porous water distribution board (19) bottom, gas-liquid fully contacts the formation saturation steam in liquid film, discharges evaporator room (14) through induced draft fan (13) from porous water distribution board (19) upper space;
The liquid of 3), flowing through behind the negative pressure liquid film producer (9) is collected at the liquid concentrator cyclic water tank (10) of evaporator room (14) bottom; A part promotes to get back to through recycle pump (11) distributes water tank (6); Repeating step 2) circulate concentratedly, a part is got back to equalizing tank (2) and is carried out heat compensation;
4), the air in the evaporator room (14) is transported to aerosol regenerating column (15) through induced draft fan (13), fully contact condensation vapor, recycling after lime set catch tray (17) collection with the gas filler of loading in the tower (16) that coagulates;
5), when the liquid concentrator in the liquid concentrator cyclic water tank reaches or near after saturated, discharges through liquid concentrator bleed valve (12), soluble solids is separated out, get into settling tank (20) post precipitation, its supernatant turns back to equalizing tank again, repeating step 1) to step 4).
Negative pressure liquid film producer (9) surface can be designed to the hole of various ways, makes between material and the porous water distribution board (19) and forms cavitation, improves the gas-to-liquid contact ability.The cavitation of negative pressure liquid film producer (9) bottom forms a slight negative pressure; Make gas get into flow from porous water distribution board (19) bottom; The bubble that forms stops the sufficiently long time in liquid to make that it fully contacts with liquid also saturated gradually, and gas-liquid two-phase is accomplished component and thermal exchange in this process.The suction function of induced draft fan can be strengthened the airiness and the gas-to-liquid contact of evaporator room (14).It is thus clear that the characteristic of the inventive method is under state of nature, to utilize the negative pressure drop lower boiling, low-temperature evaporation makes liquid concentration, utilizes induced draft fan to strengthen gas circulation simultaneously, produces the effect that reduces cost of investment and working cost.
Described distribution water tank bottom liquid outlet (7) is provided with adjustable baffle plate, one group of slit of uniform distribution on the baffle plate.
Equalizing tank (2) is preceding to carry out pre-treatment to described brine waste getting into, like the filtering suspended substance or regulate pH value etc.
Described brine waste carries out heat compensation by interchanger (3) in equalizing tank (2), regulate water temperature in 50～70 ± 5 ℃ of scopes.
Described induced draft fan outlet air relative humidity is controlled at 55-95%.Induced draft fan outlet air relative humidity can be regulated through adjustment induced draft fan air quantity.
Usually, the GWR of entering evaporator room (14) is controlled between 250 ~ 500:1.
The described liquid concentrator preferred concentration of step 5) is discharged through liquid concentrator bleed valve (12) after the 200000mg/L-saturation concentration.
Liquid concentrator is separated out soluble solids and deposition and removed supernatant in settling tank after, the concentrated bittern that obtains containing soluble solids can adopt method of the prior art to be cured processing, like evaporation, solid waste absorption etc., or burns, buries processing etc.
Beneficial effect: negative pressure liquid film low-temperature evaporation formula brine waste Zero discharge treatment method of the present invention; Be characterized near concentrating material under the state of nature,, improve atmospheric moisture and strengthen the aqueous vapor evaporation through negative pressure drop lower boiling and air cycle; Utilize induced draft fan to strengthen air cycle simultaneously; Saturation steam reclaims moisture evaporated by the aerosol regenerating column, and comprehensive utilization is implemented in the zero discharge treatment of hanging down high slat-containing wastewater under investment, the less energy-consumption condition; Reach the requirement of industrial effluent reusing and " zero release ", greatly improve water resource environment; Effectively alleviate the investment and the operating pressure of environmental protection facilities of the enterprise simultaneously, reduce maintenance of the equipment maintenance difficulty.The large-scale promotion of the inventive method is used, significant and good economy and environmental benefit.
Describe the present invention below in conjunction with specific embodiment.Protection scope of the present invention is not exceeded with embodiment, but is limited claim.
Description of drawings
Fig. 1 negative pressure liquid film evaporation formula brine waste Zero-discharge treating process schematic flow sheet; Wherein: 1; Water-in 2; Equalizing tank 3; Interchanger 4; Well heater 5; Stoste lift pump 6; Distribute water tank 7; Elevated tank liquid outlet 8; Blast inlet 9; Negative pressure liquid film producer 10; Liquid concentrator cyclic water tank 11; Recycle pump 12; Liquid concentrator bleed valve 13; Induced draft fan 14; Evaporator room 15; Aerosol regenerating column 16; Coagulate gas filler 17; Lime set catch tray 18; Lime set outlet 19; Porous water distribution board 20; Settling tank 21; Mud transferpump 22; Sludge dewatering equipment.
Fig. 2 negative pressure liquid film generator architecture synoptic diagram.
Embodiment
Referring to Fig. 1 and Fig. 2, negative pressure liquid film low-temperature evaporation formula brine waste Zero discharge treatment method of the present invention may further comprise the steps:
1) attemperation
Get into equalizing tank 2 after the former brine waste pre-treatment, regulate water quality and quantity, the interchanger 3 that connects well heater 4 is arranged in the equalizing tank 2, keep in the equalizing tank 2 water temperature in 50～70 ± 5 ℃ of scopes through automatic temperature control system.
2) circulating and evaporating
Brine waste promotes to get into through stoste lift pump 5 and distributes water tank 6 behind the attemperation, from distributing water tank 6 bottom liquid outlets 7 slowly dirty along porous water distribution board 19 inclined-planes.Be provided with an a plurality of porous water distribution board 19 in the evaporator room 14, embark on journey on the porous water distribution board 19 and arrange negative pressure liquid film producer 9.The liquid film that current form on the porous water distribution board 19 forms cavitation on negative pressure liquid film producer 9, air gets into liquid film from porous water distribution board 19 bottoms; Under the synergy of induced draft fan 13, strengthen gas-to-liquid contact, make water transport in air; Form saturation steam, material is progressively concentrated.
Material along porous water distribution board 19 inclined-planes flow down is got back to liquid concentrator cyclic water tank 10, and a part is got back to through recycle pump 11 and distributed water tank 6, and a part is carried out temperature compensation to equalizing tank 2, keeps the vaporization temperature of design.
3) air quantity is regulated
Air gets into evaporator rooms 14 from blast inlet 8, can be under state of nature to flowing into evaporator room 14, or adopt air compressor pump to pump into.According to the detected result of induced draft fan 13 outlet air humidity, the adjustment air quantity keeps relative air humidity to maintain 55%-95%.Be lower than 55% like relative air humidity, can adjust and reduce the induced draft fan air quantity, increase the induced draft fan air quantity otherwise transfer, to reach energy efficient under good evaporation conditions through the frequency conversion mode.
GWR is controlled between 250 ~ 500:1 generally speaking.
4) lime set is collected reuse
Induced draft fan 13 outlet saturated airs are through pipeline input aerosol regenerating column 15, with coagulate gas filler 16 when contact, most of moisture condenses into water droplet and falls lime set catch tray 17, through lime set outlet 18 recovery, according to the reuse of reuse point water quality requirement.
5) bittern discharging
According to the mensuration result of densitometer in the liquid concentrator cyclic water tank 10, control bittern quantity discharged.Liquid progressively concentrates in the liquid concentrator cyclic water tank 10, reaches capacity or when saturated, through the control of liquid concentrator bleed valve 12, progressively discharge, and soluble solids is separated out.The liquid concentrator that comprises soluble solids gets into settling tank 20 post precipitations, and its supernatant turns back to equalizing tank 2 again, repeating step 1) to step 4).
Concentrate bittern in the settling tank 20 and comprise soluble solids and a small amount of saturated salt solution, carry out further solidification treatment.Such as natural mummification, or merge, be transported to sludge dewatering equipment 22 through slurry transportation pump 21 and carry out deep dehydration, form the pie water ratio and reach the solid about 30%, can be used as building materials or fuel utilization then with the excess sludge of biochemical section.
Embodiment 1
Designing treatment ability 2m
3The negative pressure liquid film evaporation formula brine waste zero discharge treatment system of/h; After being installed on certain water treatment project two-pass reverse osmosis device; Carry out evaporation process as stated above; The excess sludge of bittern (containing soluble solids) after concentrating and biochemical section is processed in the lump, and lime set recovery back entering two-pass reverse osmosis inlet chest is handled the back recycling.
Water inlet TDS concentration 30204 ~ 37527mg/L, the equalizing tank temperature is controlled at 50 ± 5 ℃, pump flow 1.2 ~ 1.8m
3/ h (variable ratio frequency changer adjusting), induced draft fan air quantity 500 ~ 650m
3/ h (variable ratio frequency changer adjusting), porous water distribution board 19 area 1m
2, aerosol regenerating column diameter 1m, stack shell height 1.5m coagulates gas packed height 1m.
Device normally moves 30 days, co-processing waste liquid 1440m continuously through debugging in 6 days
3, accumulative total power consumption 21.6kWh concentrates the about 7.0 ~ 7.7m of bittern quantity discharged
3/ d reclaims lime set 40.1 ~ 38.7m
3/ d, the recovery about about 82.5%.
Embodiment 2
Designing treatment ability 2m
3The negative pressure liquid film evaporation formula brine waste zero discharge treatment system of/h; After being installed on certain wastewater treatment project two-pass reverse osmosis device; Carry out evaporation process as stated above; The excess sludge of bittern (containing soluble solids) after concentrating and biochemical section is processed in the lump, and lime set recovery back entering first-stage reverse osmosis inlet chest is handled the back recycling.
Water inlet TDS concentration 40847 ~ 48662mg/L, the equalizing tank temperature is controlled at 60 ± 5 ℃, pump flow 1.2 ~ 1.8m
3/ h (variable ratio frequency changer adjusting), induced draft fan air quantity 650 ~ 800m
3/ h (variable ratio frequency changer adjusting), porous water distribution board 19 area 1m
2, aerosol regenerating column diameter 1m, stack shell height 1.5m coagulates gas packed height 1m.
Device normally moves 30 days, co-processing waste liquid 1440m continuously through debugging in 6 days
3, accumulative total power consumption 18.3kWh concentrates the about 6.9 ~ 8.1m of bittern quantity discharged
3/ d reclaims lime set 39.1 ~ 37.5m
3/ d, the recovery about about 79.2%.
Embodiment 3
Designing treatment ability 2m
3The negative pressure liquid film evaporation formula brine waste zero discharge treatment system of/h; After being installed on certain de-salted water project two-pass reverse osmosis device; Carry out evaporation process as stated above, the natural mummification of bittern (containing soluble solids) after concentrating, lime set gets into the two-pass reverse osmosis inlet chest and handles the back recycling.
Water inlet TDS concentration 19204 ~ 29188mg/L, the equalizing tank temperature is controlled at 70 ± 5 ℃, pump flow 1.2 ~ 1.8m
3/ h (variable ratio frequency changer adjusting), induced draft fan air quantity 800 ~ 1000m
3/ h (variable ratio frequency changer adjusting), porous water distribution board 19 area 1m
2, aerosol regenerating column diameter 1m, stack shell height 1.5m coagulates gas packed height 1m.
Device normally moves 30 days, co-processing waste liquid 1440m continuously through debugging in 6 days
3, accumulative total power consumption 24.4kWh concentrates the about 3.1 ~ 3.9m of bittern quantity discharged
3/ d reclaims lime set 41.9 ~ 42.6m
3/ d, the recovery about about 87%.
Can be known that by the foregoing description negative pressure liquid film evaporation formula brine waste Zero discharge treatment method of the present invention is effective aspect concentrating at strong brine, concentration rate can reach more than 15 times, can effectively reduce the investment and the running cost of evaporative crystallization, and maintenance is convenient.
Claims (7)
1. a negative pressure liquid film low-temperature evaporation formula brine waste Zero discharge treatment method comprises the steps:
1), is promoted to through the brine waste of stoste lift pump (5) after and distributes water tank (6) adjustment temperature in the equalizing tank (2); Be evenly distributed on the porous water distribution board (19) of downward-sloping setting in the evaporator room (14); Described porous water distribution board (19) is gone up and is arranged negative pressure liquid film producer (9), is made up of the convexity of hole on the porous water distribution board (19) and top, hole;
2), brine waste is gone up at porous water distribution board (19) and is formed liquid film; The hole is formed at negative pressure liquid film producer (9) bottom; Air is from getting into evaporator room (14) from blast inlet (8); The air that gets into evaporator room (14) gets into liquid film from porous water distribution board (19) bottom, gas-liquid fully contacts the formation saturation steam in liquid film, discharges evaporator room (14) through induced draft fan (13) from porous water distribution board (19) upper space;
The liquid of 3), flowing through behind the negative pressure liquid film producer (9) is collected at the liquid concentrator cyclic water tank (10) of evaporator room (14) bottom; A part promotes to get back to through recycle pump (11) distributes water tank (6); Repeating step 2) circulate concentratedly, a part is got back to equalizing tank (2) and is carried out heat compensation;
4), the air in the evaporator room (14) is transported to aerosol regenerating column (15) through induced draft fan (13), fully contact condensation vapor, recycling after lime set catch tray (17) collection with the gas filler of loading in the tower (16) that coagulates;
5), when the liquid concentrator in the liquid concentrator cyclic water tank reaches or near after saturated, discharges through liquid concentrator bleed valve (12), soluble solids is separated out, get into settling tank (20) post precipitation, its supernatant turns back to equalizing tank again, repeating step 1) to step 4).
2. brine waste Zero discharge treatment method according to claim 1 is characterized in that, equalizing tank (2) is preceding to carry out pre-treatment to described brine waste getting into.
3. brine waste Zero discharge treatment method according to claim 1 is characterized in that, described brine waste carries out heat compensation by interchanger (3) in equalizing tank (2), regulates water temperature in 50～70 ± 5 ℃ of scopes.
4. brine waste Zero discharge treatment method according to claim 1 is characterized in that, described induced draft fan (13) outlet air relative humidity is controlled at 55-95%.
5. brine waste Zero discharge treatment method according to claim 1 is characterized in that, the GWR that gets into evaporator room (14) is controlled between 250 ~ 500:1.
6. brine waste Zero discharge treatment method according to claim 1 is characterized in that, after the described liquid concentrator concentration of step 5) is 200000mg/L～saturation concentration, discharges through liquid concentrator bleed valve (12).
7. brine waste Zero discharge treatment method according to claim 1; It is characterized in that; After liquid concentrator was separated out soluble solids and deposition and removed supernatant in the step 5) in settling tank, the concentrated bittern that obtains containing soluble solids evaporated, solid waste, burn or bury processing.
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| CN103058303A (en) * | 2012-11-26 | 2013-04-24 | 北京化工大学 | Method for separating inorganic salt substances from high-salt liquid waste |
| CN103553166A (en) * | 2013-11-14 | 2014-02-05 | 天津辰创环境工程科技有限责任公司 | Device and method of treating wastewater with high salt content by utilizing waste heat of circulating water |
| CN103848464A (en) * | 2014-02-28 | 2014-06-11 | 长沙威保特环保科技有限公司 | Treatment method of low-temperature evaporation high-concentration sewage |
| CN104843921A (en) * | 2015-04-30 | 2015-08-19 | 北京朗新明环保科技有限公司南京分公司 | Low temperature evaporation type high-salinity wastewater treatment device |
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| CN116135288A (en) * | 2023-03-20 | 2023-05-19 | 绍兴越信环保科技有限公司 | Bipolar membrane electrodialysis device for preparing organic acid by using organic acid salt |
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| CN103848464B (en) * | 2014-02-28 | 2015-12-30 | 长沙威保特环保科技有限公司 | The treatment process of low-temperature evaporation high-concentration sewage |
| CN104843921A (en) * | 2015-04-30 | 2015-08-19 | 北京朗新明环保科技有限公司南京分公司 | Low temperature evaporation type high-salinity wastewater treatment device |
| CN106902532A (en) * | 2017-03-27 | 2017-06-30 | 上海泓毅环保科技有限公司 | A kind of low temp liquid evaporator |
| CN110734188A (en) * | 2018-07-18 | 2020-01-31 | 上海明勃电气自动化有限公司 | waste water zero release processing system |
| CN109956511A (en) * | 2019-03-20 | 2019-07-02 | 山西国润环保科技有限公司 | Integral vacuum desulfurization wastewater drying device |
| CN111547797A (en) * | 2020-05-29 | 2020-08-18 | 朱云强 | Concentration method of ultralow-consumption salt-containing wastewater |
| CN116135288A (en) * | 2023-03-20 | 2023-05-19 | 绍兴越信环保科技有限公司 | Bipolar membrane electrodialysis device for preparing organic acid by using organic acid salt |
| CN116135288B (en) * | 2023-03-20 | 2023-08-18 | 绍兴越信环保科技有限公司 | Bipolar membrane electrodialysis device for preparing organic acid by using organic acid salt |
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