CN105621775A - Novel desulfurated wastewater zero-emission treatment device and method - Google Patents
Novel desulfurated wastewater zero-emission treatment device and method Download PDFInfo
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- CN105621775A CN105621775A CN201610081217.9A CN201610081217A CN105621775A CN 105621775 A CN105621775 A CN 105621775A CN 201610081217 A CN201610081217 A CN 201610081217A CN 105621775 A CN105621775 A CN 105621775A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
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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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
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Abstract
The invention provides a novel desulfurated wastewater zero-emission treatment device which comprises a calcium and heavy metal removing tank, a coagulating tank, a clearing tank and a nano-filtrating system. The calcium and heavy metal removing tank is provided with a first dosage unit, the coagulating tank is communicated with the calcium and heavy metal removing tank and provided with a second dosage unit, the clearing tank is communicated with the coagulating tank, the nano-filtrating system is communicated with the clearing tank, a third dosage unit and a filter are arranged between the clearing tank and the nano-filtrating system, the nano-filtrating system comprises a sulfate concentrated water outlet and a chlorine salt fresh water outlet, the sulfate concentrated water outlet is communicated with a flue evaporation system, and the chlorine salt fresh water outlet is communicated with a membrane concentration system. The invention further provides a method based on the device. The device can adapt to needs of a flue evaporation method to treat desulfurated wastewater, and running and treating cost is lowered substantially.
Description
Technical field
The present invention relates to environmental protection technical field, be specifically related to a kind of Novel desulphurization wastewater zero discharge and process device and method.
Background technology
Most of coal-burning power plant of China have employed Limestone-gypsum Wet Flue Gas Desulfurization Process technology, in order to remove the sulfur dioxide in flue gas. In process of wet desulphurization, producing desulfurization wastewater, desulfurization wastewater complicated component, containing high concentration suspended matter, oversaturated sulphite, chloride ion, sulfate and various heavy. Current desulfurization wastewater mainly adopts chemical precipitation method to process, part index number difficulty up to standard, even if after process up to standard, due to sulfate substantial amounts of in waste water and muriatic existence, water outlet salinity is still up to about 3%, it is difficult to recycling, surface water and soil ecology also can be caused after outer row to break, cause secondary pollution. Therefore, the exploitation of desulfurization wastewater zero discharge treatment technology increasingly comes into one's own.
Flue facture is a kind of method that waste water carries out spray evaporation process in flue. When adopting flue evaporation to process desulfurization wastewater, spray in the flue before electric cleaner after desulfurization wastewater being atomized initially with certain spray regime, waste water evaporates rapidly gasification with the form of droplet after high-temperature flue gas heats, float therein and soluble solids form fine solid particles, then under the effect of carrying secretly of air-flow, enter electric cleaner and caught removal by electrode, to arrange outside dust form, the waste water near-zero release finally realizing desulfurization processes.
Compared with existing desulfurization wastewater treatment technology, flue evaporation has many merits: equipment is simple, without adding chemical agent, it is possible to effectively overcome the shortcoming that existing Waste Water Treatment equipment is many, investment is big, operating cost is high and equipment repair and maintenance workload is big; Running simple to operate, the pollutant in waste water are discharged with ash form-separating, without sludge treatment problem; Owing to waste water introduces in flue, it is possible to properly increase smoke moisture, thus reducing the ratio resistance of dust granule in flue gas, be conducive to improving efficiency of dust collection.
But, flue evaporation process there is also following weak point: first, flue evaporation disposal ability is limited, for some power plant, it is subject to the impacts such as flue gas moisture content, flue-gas temperature, exhaust gas volumn, in order to ensure the subsequent techniques such as dedusting not to be had a negative impact, this technique can only evaporation section waste water; Second, owing to useless impurities in water eventually enters in flyash, it is possible to the comprehensive utilization of flyash can be had a strong impact on.
Therefore, in order to overcome the disadvantages mentioned above of flue evaporation, it is necessary to develop Novel desulphurization wastewater zero emission treatment method adaptable, that economy is high.
Summary of the invention
For the problems referred to above, it is an object of the invention to provide a kind of Novel desulphurization wastewater zero discharge and process device and method. Can adapt to the demand of flue evaporation desulfurization wastewater is processed, and operation and processing cost are greatly reduced.
For reaching above-mentioned purpose, the concrete technical scheme that the present invention takes is:
The device that a kind of Novel desulphurization wastewater zero discharge processes, including:
One deliming, except weight pond, is provided with one first dispensing unit;
Remove the coagulating basin that weight pond connects with described deliming, be provided with one second dispensing unit;
The depositing reservoir connected with described coagulating basin;
The nanofiltration system connected with described depositing reservoir; It is provided with one a 3rd dispensing unit and filter between described depositing reservoir and nanofiltration system;
Described nanofiltration system includes a dense water out of sulfate and a villaumite water outlet, the dense water out of described sulfate and flue vapo(u)rization system connection; Described villaumite water outlet and a membrance concentration system connectivity.
Further, described deliming is bucket-shaped except the bottom of weight pond, coagulating basin and depositing reservoir, and described bucket-shaped tip is all communicated to a spoil disposal pipeline.
Further, described deliming is equipped with a liquid mixing device except weight pond and coagulating basin.
Further, described membrance concentration system has condensed water outlet and a water outlet, and the outlet of described condensed water connects with a crystallizing evaporator.
Further, described membrance concentration system is selected from one or more in counter-infiltration system, positive osmosis system, electrodialysis system or Membrane Materials system.
Utilize said apparatus to carry out zero emission treatment of desulfured waste water, comprise the following steps:
1) desulfurization wastewater enters deliming except weight pond, and to deliming except adding a combination medicament A in weight pond, controlling pH in reactor is 9��10.5, makes the calcium in desulfurization wastewater generate precipitation of calcium carbonate, and heavy metal generates corresponding precipitation of hydroxide and/or sulfide precipitation; Obtain softening waste water;
2) softening waste water enters coagulating basin, adds combination medicament B, improved the mud-water separation performance of softening waste water by flocculation reaction, make calcium concentration in waste water be reduced to 2��40mg/L in coagulating basin; Obtain flocculation waste water;
3) flocculation waste water enters depositing reservoir, after mud-water separation, obtains sludge settling and low concentration wastewater;
4) nanofiltration system is entered by a filter after low concentration wastewater pH value being pulled back to 6��8;
5) nanofiltration system produces after nanofiltration processes sulfate and/or the dense water of sulphite enter flue vapo(u)rization system and dispose; The villaumite fresh water (solute solution based on sodium chloride) that nanofiltration system produces enters membrance concentration system.
Further, the distilled water also including membrance concentration system is produced carries out reuse; And the dense water that membrance concentration system produces enters crystallizing evaporator disposal.
Further, described sulfate and/or the dense water of sulphite spray into a cleaner unit leading portion flue by high pressure.
Further, the dense water that described membrance concentration system produces enters flue vapo(u)rization system.
By taking technique scheme, waste water divides after salt treatment through nanofiltration, can reduction flue evaporating waste water amount effective, controllable, the chloride ion total amount that the reduction that simultaneously can control sprays in flue, be conducive to the flyash chlorinty wide fluctuations avoided because flue evaporation process causes, and then avoid the comprehensive utilization of flyash is had a negative impact. Additionally, by controlling adding of agent in pretreatment of the present invention, only carry out removing heavily deliming, it is not necessary to demagging, require during due to demagging that wastewater pH controls higher, while avoiding heavy metal in waste water to enter in flyash, it is to avoid technology for removal of magnesium from phosphorous brings substantial amounts of reagent consumption. To sum up, the present invention have that flow process is simple, added amount of chemical is few, strong adaptability and the low advantage of processing cost.
Accompanying drawing explanation
Fig. 1 is the layout schematic diagram that the Novel desulphurization wastewater zero discharge in one embodiment of the invention processes device.
Detailed description of the invention
Features described above and advantage for making the present invention can become apparent, special embodiment below, and coordinate institute's accompanying drawing to be described in detail below.
As it is shown in figure 1, in an embodiment, it is provided that the device that a kind of Novel desulphurization wastewater zero discharge processes, including: deliming removes weight pond 1, is provided with one first dispensing unit; Remove, with deliming, the coagulating basin 3 that weight pond 1 connects, be provided with one second dispensing unit; The depositing reservoir 5 connected with coagulating basin 3; The nanofiltration system 9 connected with depositing reservoir 5; The vacuum pump 7,1 the 3rd that is provided with between depositing reservoir 5 and nanofiltration system 9 is offerd medicine unit and filter 8;
Nanofiltration system 9 includes a dense water out of sulfate and a villaumite water outlet, and the dense water out of sulfate connects with flue vapo(u)rization system 10; Villaumite water outlet connects with membrance concentration system 11.
Deliming is bucket-shaped except the bottom of weight pond 1, coagulating basin 3 and depositing reservoir 5, and described bucket-shaped tip is all communicated to spoil disposal pipeline 6.
Deliming is equipped with a liquid mixing device except weight pond 1 and coagulating basin 3. In Fig. 1, this liquid mixing device is specially the first agitating device 2 and the second agitating device 4, in some other embodiment, it is also possible to realize the mixed function of liquid by aerator.
Membrance concentration system 11 has condensed water outlet 13 and a water outlet 12, and condensed water outlet connects with crystallizing evaporator 14. Crystallizing evaporator 14 has a crystallization outlet 16 and recycle-water outlet 15 respectively
Membrance concentration system 11 is selected from one or more in counter-infiltration system, positive osmosis system, electrodialysis system or Membrane Materials system. Choose according to different operating modes and actual demand.
Filter 8 main purpose is to remove the float in waste water, makes concentration of suspension in waste water meet the inflow requirement of nanofiltration system 9, it is possible to for more medium filter, it is also possible to for the filtration system such as ultrafiltration or microfiltration.
Utilize said apparatus to carry out zero emission treatment of desulfured waste water, comprise the following steps:
First desulfurization wastewater enters deliming except weight pond, by medicament addition device to deliming except adding combination medicament A in weight pond, combination medicament is basic agent, carbonate and organic sulfur, preferred agents is calcium hydroxide, sodium carbonate and organic sulfur, controlling pH in reactor is 9��10.5, making calcium in waste water generate precipitation of calcium carbonate, the heavy metal such as chromium, zinc, hydrargyrum generates corresponding precipitation of hydroxide and sulfide precipitation. Then waste water enters coagulating basin by overflow or pipeline, opens agitating device, is simultaneously introduced combination medicament B, and combination medicament B includes flocculant and flocculation aid, improves mud-water separation performance by flocculation reaction, removes part COD simultaneously; Calcium concentration in waste water is made to be reduced to 2��40mg/L;
In depositing reservoir, calcium ion concentration controls, and mainly guarantees that nanofiltration system can be properly functioning, can control flexibly according to subsequent concentration multiple, it is ensured that economy;
Waste water in coagulating basin enters depositing reservoir by overflow or pipeline, after mud-water separation, supernatant enters filter by water pump, certain density medicament C is added by pipe-line mixer before entering filter, i.e. hydrochloric acid, wastewater pH pulls back to 6��8, and the mud that deliming produces except weight pond, coagulating basin and depositing reservoir enters spoil disposal pipeline, and then thickening processes further;
After waste water is filtered, after then making filtration, in waste water, concentration of suspension meets nanofiltration inflow requirement; Filter water outlet enters nanofiltration system, and the dense water produced after nanofiltration processes mainly contains sulfate radical, inferior sulfate radical, magnesium ion, calcium ion etc., and dense water enters flue vapo(u)rization system and disposes;
The dense water of described nanofiltration system sprays into cleaner unit leading portion flue by high-pressure nozzle, under high-temperature flue gas heats, aqueous water in waste water is evaporated to water vapour at short notice, the then crystallization of the impurity such as inorganic salt forms solid matter, entering follow-up cleaner unit then as flue gas, the magazine in final waste water is collected with the form of dirt;
The fresh water (solute solution based on sodium chloride) that described nanofiltration system produces enters membrance concentration system;
After membrance concentration system processes, the fresh water produced is back in power plant, according to characteristics such as power-plant flue gas generation amount, constituent, temperature, fly ash in electric power plant comprehensive utilization situation, and the parameter such as this power plant desulfurization waste water water yield, water quality, it is determined that membrance concentration system produces the processing mode of the dense water of sodium chloride;
If described membrance concentration system produces dense water by flue evaporation process, total utilization of PCA will not be produced impact, then the dense water that the dense water of membrance concentration system generation and nanofiltration system produce is combined into flue vapo(u)rization system and processes;
If fly ash in electric power plant comprehensively utilizes, or described membrance concentration system produces dense water by flue evaporation process, total utilization of PCA can be had a negative impact, then membrance concentration system produces dense water and enters crystallizing evaporator, produces crystal salt and sells as outside Nacl; The distilled water produced is back to power plant.
For a Practical Project, taking certain power plant desulfurization waste water, desulfurization wastewater initially enters deliming except weight pond, by adding calcium hydroxide, sodium carbonate and organic sulfur, controlling pH in reactor is 9��10.5, makes the heavy metal such as the calcium in waste water and chromium, zinc, hydrargyrum generate corresponding precipitation and remove. Then waste water enters coagulating basin, flocculant and flocculation aid, improves mud-water separation performance, removes part COD simultaneously; Make calcium concentration in waste water be reduced to 2��40mg/L, meet subsequent nano-filtration inflow requirement.
Then the waste water in coagulating basin enters depositing reservoir, after mud-water separation, supernatant is logical enters filter, certain density hydrochloric acid is added by pipe-line mixer before entering filter, wastewater pH is pulled back to 6��8, the mud that deliming produces except weight pond, coagulating basin and depositing reservoir enters spoil disposal pipeline, and then thickening processes further; After waste water is filtered, waste water enters nanofiltration system, and the dense water that nanofiltration produces after processing enters flue vapo(u)rization system and disposes; The fresh water (solute solution based on sodium chloride) that nanofiltration produces enters membrance concentration system.
After membrance concentration system processes, the fresh water of generation is back in power plant, produces dense water and enters crystallizing evaporator, produces crystal salt and sells as outside Nacl; The distilled water that evaporative crystallization produces is back to power plant.
Different according to adopting membrance concentration technique, through adjusting, ton water handling is about 15-25 unit; Relatively prior art significantly declines, and multi-products produce water can reuse, by increasing capacitance it is possible to increase additional income or reduce respective handling cost, avoid the chlorine in waste water that total utilization of PCA is had a negative impact simultaneously.
It should be noted that; the above, for the preferably case study on implementation of the present invention, not impose any restrictions the present invention; every any simple modification, change and equivalent structure change above example made according to the technology of the present invention essence, all still falls within the protection domain of technical solution of the present invention.
Claims (9)
1. the device that a Novel desulphurization wastewater zero discharge processes, it is characterised in that including:
One deliming, except weight pond, is provided with one first dispensing unit;
Remove the coagulating basin that weight pond connects with described deliming, be provided with one second dispensing unit;
The depositing reservoir connected with described coagulating basin;
The nanofiltration system connected with described depositing reservoir; It is provided with one a 3rd dispensing unit and filter between described depositing reservoir and nanofiltration system;
Described nanofiltration system includes a dense water out of sulfate and a villaumite water outlet, the dense water out of described sulfate and flue vapo(u)rization system connection; Described villaumite water outlet and a membrance concentration system connectivity.
2. the device that Novel desulphurization wastewater zero discharge as claimed in claim 1 processes, it is characterised in that described deliming is bucket-shaped except the bottom of weight pond, coagulating basin and depositing reservoir, and described bucket-shaped tip is all communicated to a spoil disposal pipeline.
3. the device that Novel desulphurization wastewater zero discharge as claimed in claim 1 processes, it is characterised in that described deliming is equipped with a liquid mixing device except weight pond and coagulating basin.
4. the device that Novel desulphurization wastewater zero discharge as claimed in claim 1 processes, it is characterised in that described membrance concentration system has condensed water outlet and a water outlet, and the outlet of described condensed water connects with a crystallizing evaporator.
5. the device that Novel desulphurization wastewater zero discharge as claimed in claim 1 processes, it is characterised in that described membrance concentration system is selected from one or more in counter-infiltration system, positive osmosis system, electrodialysis system or Membrane Materials system.
6. the zero emission treatment of desulfured waste water utilizing device described in any one of claim 1 to 5 to carry out, comprises the following steps:
1) desulfurization wastewater enters deliming except weight pond, and to deliming except adding a combination medicament A in weight pond, controlling pH in reactor is 9��10.5, makes the calcium in desulfurization wastewater generate precipitation of calcium carbonate, and heavy metal generates corresponding precipitation of hydroxide and/or sulfide precipitation; Obtain softening waste water;
2) softening waste water enters coagulating basin, adds combination medicament B, improved the mud-water separation performance of softening waste water by flocculation reaction, make calcium concentration in waste water be reduced to 2��40mg/L in coagulating basin; Obtain flocculation waste water;
3) flocculation waste water enters depositing reservoir, after mud-water separation, obtains sludge settling and low concentration wastewater;
4) nanofiltration system is entered by a filter after low concentration wastewater pH value being pulled back to 6��8;
5) nanofiltration system produces after nanofiltration processes sulfate and/or the dense water of sulphite enter flue vapo(u)rization system and dispose; The villaumite fresh water (solute solution based on sodium chloride) that nanofiltration system produces enters membrance concentration system.
7. zero emission treatment of desulfured waste water as claimed in claim 6, it is characterised in that the distilled water also including membrance concentration system is produced carries out reuse; And the dense water that membrance concentration system produces enters crystallizing evaporator disposal.
8. zero emission treatment of desulfured waste water as claimed in claim 6, it is characterised in that described sulfate and/or the dense water of sulphite spray into a cleaner unit leading portion flue by high pressure.
9. zero emission treatment of desulfured waste water as claimed in claim 6, it is characterised in that the dense water that described membrance concentration system produces enters flue vapo(u)rization system.
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| CN106241972A (en) * | 2016-08-23 | 2016-12-21 | 盛发环保科技（厦门）有限公司 | Based on electrodialytic zero emission treatment of desulfured waste water and system |
| CN106430786A (en) * | 2016-11-08 | 2017-02-22 | 神华集团有限责任公司 | Desulfurization wastewater treating method and device |
| CN106430786B (en) * | 2016-11-08 | 2020-04-03 | 神华集团有限责任公司 | Desulfurization wastewater treatment method and device |
| CN107954560A (en) * | 2017-11-08 | 2018-04-24 | 西安协力动力科技有限公司 | The technique that vapor recompression is concentrated by evaporation joint flue spray technique processing waste water |
| CN108996788A (en) * | 2018-07-27 | 2018-12-14 | 浙江德创环保科技股份有限公司 | A kind of zero emission method of wastewater based on crystallisation by cooling and flue evaporation technique |
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