CN103466871B - Treatment method and recycling system for industrial wastewater of polycrystalline silicon batteries - Google Patents
Treatment method and recycling system for industrial wastewater of polycrystalline silicon batteries Download PDFInfo
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- CN103466871B CN103466871B CN201310369320.XA CN201310369320A CN103466871B CN 103466871 B CN103466871 B CN 103466871B CN 201310369320 A CN201310369320 A CN 201310369320A CN 103466871 B CN103466871 B CN 103466871B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/33—Wastewater or sewage treatment systems using renewable energies using wind energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The invention relates to a treatment method for industrial wastewater of polycrystalline silicon batteries. The treatment method comprises the following steps: different-source treatment, precipitation treatment, triple effect evaporation treatment, reprecipitation treatment, filtration treatment and reverse osmosis treatment. According to the invention, wastewater with concentrated nitrogen, diluted nitrogen, and phosphorus is collected respectively; through the adoption of different treatment methods, the efficiency of denitrogenation and dephosphorization is improved, and the treatment cost is lowered; on the other hand, the industrial wastewater of the polycrystalline silicon batteries are recycled after being subjected to treatments of filtration and reverse osmosis, so that water resources are saved, and the environmental protection is facilitated.
Description
Technical field
The present invention relates to method of wastewater treatment, relate to particularly a kind for the treatment of process and reclaiming system thereof of polycrystal silicon cell factory effluent.
Background technology
Under the impact of global energy crisis, the development of renewable energy source industry more and more receives the concern of national governments.The inexhaustible clean energy that utilizes the Nature to give, as sun power, wind energy, tidal energy etc., not only can solve the problem of future source of energy shortage, also protection of the environment effectively.Under the promotion of relevant policies, rules, science and technology, the photovoltaic industry of China has obtained swift and violent development.Yet as the emerging industry of producing clean energy, the production process of polycrystal silicon cell is in fact also unclean, the polycrystal silicon cell factory effluent of discharging thus contains nitrogen, phosphorus, fluorine element, can cause serious environmental pollution and ecological damage.
On the other hand, shortage of water resources has become the important factor of restriction China's economy and social development.Industry water withdrawal accounts for 20% of national water withdrawal, for further strengthening Industrial Water Saving work, alleviate the imbalance between supply and demand of China's water resources, the impetus of containment water environment degradation, promote the coordinated development of industrial economy and water resources and environment, first the < < China water-saving technology policy outline > > promulgating for 2005 has proposed the requirement of the reuse of development efflux wastewater and " zero release " technology.In November, 2007, the new < < national environmental protection Eleventh Five-Year Plan > > promulgating of country more explicitly called for popularization cycling utilization of wastewater, strove for waste water and discharged less or zero release.
For the water saving that responds to the call of one's country; simultaneously protection of the environment, save enterprise's production cost, necessary polycrystal silicon cell factory effluent is carried out to clean, realize the zero release of nitrogen phosphorus; and then can recycle water resources, embody polycrystal silicon cell as the meaning of clean energy.
Summary of the invention
The object of the invention is to provide in order to overcome the deficiencies in the prior art a kind of nitrogen, phosphorus, the fluorine element that can effectively remove in polycrystal silicon cell factory effluent, the treatment process of finally waste water reclamation being utilized.
For solving above technical problem, a kind of technical scheme that the present invention takes is: a kind for the treatment of process of polycrystal silicon cell factory effluent, comprises the following steps:
(a) divide source to process: according to different process, produce the water quality characteristics of waste water, be divided into dense nitrogen, rare nitrogen waste water carries out respectively collection and treatment, wherein phosphorus-containing wastewater is sneaked into rare nitrogen waste water co-treatment;
(b) dense nitrogen wastewater sedimentation is processed: under continuous agitation condition, in described dense nitrogen waste water, add sodium hydroxide to regulate pH to 6.5 ~ 7.5, add flocculation agent to separate out a large amount of solids, then add coagulating agent to make solid increase precipitation, press filtration obtains filtrate;
(c) dense nitrogen waste water triple effect evaporation is processed: under pressure-driven, gained filtrate in step (b) is carried out to triple effect evaporation processing, after processing, a gained part is crystallization concentrated solution, another part is phlegma, described crystallization concentrated solution is through centrifugation, the parting liquid producing is incorporated to filtrate and re-starts triple effect evaporation processing, and described phlegma imports in rare nitrogen waste water;
(d) rare nitrogen wastewater sedimentation is processed: in described rare nitrogen waste water, drop into 600 ~ 1200mg/LCa (OH)
2, precipitation, to remove the fluorion in waste water, adds subsequently acid solution or alkali lye to regulate pH to 7.8 ~ 8.2, then adds respectively 10 ~ 30ppm coagulating agent, 0.5 ~ 2ppm flocculation agent to precipitate, and obtains supernatant liquor;
(e) filtration treatment: under pressure-driven, gained supernatant liquor in step (d) is obtained after uf processing to ultrafiltration and produce water and ultrafiltration dope, described ultrafiltration dope imports in rare nitrogen waste water;
(f) reverse-osmosis treated: under pressure-driven, gained ultrafiltration in step (e) is produced to water and carry out reverse osmosis concentration processing, obtain reverse osmosis produced water and reverse osmosis dope, described reverse osmosis dope repeats triple effect evaporation and processes, and described reverse osmosis produced water is removed NO through anion bed
3 -and PO
4 3-rear recycling.
Optimally, supernatant liquor described in step (d) is first processed by sand filtration, dish filter, softening, bag filter before ultrafiltration.
Further, described sand filtration scavenging period is 200 ~ 400min, and dish filter scavenging period is 20 ~ 40min, and softening scavenging period is 300 ~ 500min, and deep bed filter hole is 200 μ m.
Optimally, described in step (d), supernatant liquor also carries out matting in uf processing, and the timed interval of described matting is 7-30 days.
Optimally, reverse osmosis dope described in step (f) carried out a reverse osmosis concentration processing before carrying out triple effect evaporation processing again.
Further, described two steps ro is processed the product water rate of recovery and is greater than respectively 65% and 50%.
Optimally, the outer processing of the committee of precipitation described in salt, step (d) analysed in crystallization described in filter residue described in step (b), step (c).
The present invention also provides a kind for the treatment of system of polycrystal silicon cell factory effluent, it comprises interconnective dense nitrogen Waste Water Treatment and rare nitrogen Waste Water Treatment, described dense nitrogen Waste Water Treatment comprises the dense nitrogen wastewater equalization pond connecting successively, reaction tank, filter-pressing device, filtrate collection pond, triple-effect evaporator, centrifugal separating device, described rare nitrogen Waste Water Treatment comprises the rare nitrogen wastewater equalization pond connecting successively, pH regulator groove, coagulation-flocculation groove, settling bath, intermediate pool, water tank with strainer, ultra-filtration equipment, reverse osmosis membrane apparatus, reuse collecting tank, anion bed, reuse water tank, wherein said filtrate collection pond also respectively with centrifugal separating device, reverse osmosis membrane apparatus is connected, described triple-effect evaporator is connected with rare nitrogen wastewater equalization pond, described rare nitrogen wastewater equalization pond produces water tank with ultrafiltration and is connected.
Optimally, between described intermediate pool and water tank with strainer, be also connected with sand filter, disc filter, softening bed, deep bed filter in turn.
Optimally, between described reverse osmosis membrane apparatus and ultra-filtration equipment, be also provided with a set of reverse osmosis membrane apparatus.
Because technique scheme is used, the present invention compared with prior art has following advantages: first the treatment process of polycrystal silicon cell factory effluent of the present invention collects respectively dense nitrogen, rare nitrogen, phosphorus-containing wastewater, take different treatment processs, improved denitrogenate, the efficiency of dephosphorization, reduced processing cost; On the other hand, to polycrystal silicon cell factory effluent filter and reverse-osmosis treated after recycle, saved water resources, be conducive to protection of the environment.
Accompanying drawing explanation
Accompanying drawing 1 is the treatment system connection diagram of polycrystal silicon cell factory effluent in the present invention;
Wherein: 101, dense nitrogen Waste Water Treatment; 102, rare nitrogen Waste Water Treatment; 1, dense nitrogen wastewater equalization pond; 2, reaction tank; 3, filter-pressing device; 4, filtrate collection pond; 5, triple-effect evaporator; 6, centrifugal separating device; 7, rare nitrogen wastewater equalization pond; 8, pH regulator groove; 9, coagulation-flocculation groove; 10, settling bath; 11, intermediate pool; 12, sand filter; 13, disc filter; 14, softening bed; 15, deep bed filter; 16, water tank with strainer; 17, ultra-filtration equipment; 18, reverse osmosis membrane apparatus; 18 ', reverse osmosis membrane apparatus; 19, reuse collecting tank; 20, anion bed; 21, reuse water tank.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiment of the invention is elaborated:
According to different process, produce the water quality characteristics of waste water, the dense nitrogen waste water such as nitrogenous waste gas washing water, the draining of nitrogenous dope groove are imported to dense nitrogen wastewater equalization pond 1, rare nitrogen waste water such as phosphorus-containing wastewater, nitrogenous acid tank rinse water are imported to rare nitrogen wastewater equalization pond 7 and collect respectively.
As shown in Figure 1, dense nitrogen waste water is promoted to reaction tank 2 through pump, add NaOH to carry out neutralization reaction, and fully stir, adjust pH to 6.5 ~ 7.5, add flocculation agent cationic polyacrylamide PAM to produce cotton-shaped solid, and then add coagulant polymeric aluminium chloride PAC to make cotton-shaped solid become large precipitation, and unlatching pneumatic pump is pumped in filter-pressing device 3 carries out press filtration, and filtrate enters filtrate collection pond 4, the dewatered sludge outer processing of entrusting, reduces environmental pollution.Then the nitrogenous dope in filtrate collection pond 4 is pumped into evaporative crystallization in triple-effect evaporator 5, a gained part is crystallization concentrated solution, import through centrifugal from device 6 through centrifugation, filter out solid crystal, committee is outer to process, and mother liquor returns to triple-effect evaporator 5 and continues evaporative crystallization; Another part is phlegma, imports rare nitrogen wastewater equalization pond 7.The triple-effect evaporator using in the present embodiment is triple effect pump feed evaporator, because contain the various material more complicated such as Sodium Fluoride, SODIUMNITRATE, sodium sulfate in former water, especially the solubleness of Sodium Fluoride is very little, for preventing producing Crystallization Plugging heat transfer tube in evaporative process, therefore adopt triple effect pump feed evaporator, its liquid circulation velocity is fast simultaneously, heat exchange efficiency is high, interchanger result of use is good, not often cleaning.
In rare nitrogen wastewater equalization pond 7, rare nitrogen waste liquid promotes and enters pH adjustment tank 8 through pump, adds 600 ~ 1200mg/L Ca (OH)
2to remove the fluorion in waste water, add subsequently NaOH solution to regulate pH to 7.8 ~ 8.2, enter coagulation-flocculation groove 9, add PAC, PAC concentration is controlled and is less than 20ppm, then adds PAM, and PAM concentration is controlled and is less than 1ppm.Mixed solution enters settling bath 10 and carries out precipitate and separate, and supernatant liquor enters intermediate pool 11, and sludge part committee is outer to process.
Intermediate pool 11 water outlets are promoted to sand filter 12 through pump, and sand filtration is set to automatic back-washing, and scavenging period is 300min; Sand filtration is produced water and is imported disc filter 13, and dish filter scavenging period is 30min, and rear product water enters softening bed 14, and softening bed scavenging period is 480min, produces water and enter water tank with strainer 16 after the deep bed filter 15 of 200 μ m filters.Water tank with strainer water outlet promotes and enters ultra-filtration equipment 17 through pump, obtains ultrafiltration and produce water and ultrafiltration dope after wherethrough reason, and wherein ultrafiltration dope is back in rare nitrogen wastewater equalization pond 7, and quantity of reflux is 25%.In the present embodiment ultra-filtration equipment 17 except general just wash with backwash, be also provided with the matting of certain frequency, wherein chemical reagent is HCl, NaOH and NaClO, promotes the product water water quality of ultra-filtration equipment 17.Ultrafiltration is produced water and is promoted and enter in reverse osmosis system RO ' 18 ' through pump, then enters in reverse osmosis system RO18, and their the product water rate of recovery is greater than respectively 65% and 50%, and the generation that two cover reverse osmosis systems are conducive to fully reduce dope is set.The dope that RO18 produces imports in filtrate collection pond 4, and RO ' 18 ', the product water of RO18 enters reuse collecting tank 19, through pump, promote and enter anion bed 20, except the NO in anhydrating
3 -, PO
4 3-, enter reuse water tank 21, stand-by.
Utilize aforesaid method and the polycrystal silicon cell wastewater treatment of system Dui Mou enterprise, the water quality before and after processing is as follows:
COD wherein
crorganic substance relative content in the water that expression employing potassium dichromate standard method calculates, NH
3-N represents ammonia-nitrogen content, and T-N represents total nitrogen content, and T-P represents total phosphorous, F
-represent content of fluoride ion.As seen from the above table, after adopting aforesaid method and system to process waste water, the denitrification percent of rare nitrogen waste water is more than 80%, and the denitrification percent of dense nitrogen waste water is more than 99%, and the clearance of COD is more than 99%, F
-clearance, more than 99%, has reached the standard of discharge of wastewater or recycling.
Above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences that spirit is done according to the present invention change or modify, within all should being encompassed in protection scope of the present invention.
Claims (9)
1.
a treatment process for polycrystal silicon cell factory effluent, is characterized in that: comprise the following steps:
(a) divide source to process: according to different process, produce the water quality characteristics of waste water, be divided into dense nitrogen, rare nitrogen waste water carries out respectively collection and treatment, wherein phosphorus-containing wastewater is sneaked into rare nitrogen waste water co-treatment;
(b) dense nitrogen wastewater sedimentation is processed: under continuous agitation condition, in described dense nitrogen waste water, add sodium hydroxide to regulate pH to 6.5 ~ 7.5, add flocculation agent to separate out a large amount of solids, then add coagulating agent to make solid increase precipitation, press filtration obtains filtrate;
(c) dense nitrogen waste water triple effect evaporation is processed: under pressure-driven, gained filtrate in step (b) is carried out to triple effect evaporation processing, after processing, a gained part is crystallization concentrated solution, another part is phlegma, described crystallization concentrated solution is through centrifugation, the parting liquid producing is incorporated to filtrate and re-starts triple effect evaporation processing, and described phlegma imports in rare nitrogen waste water;
(d) rare nitrogen wastewater sedimentation is processed: in described rare nitrogen waste water, drop into 600 ~ 1200mg/LCa (OH)
2
, precipitation, to remove the fluorion in waste water, adds subsequently acid solution or alkali lye to regulate pH to 7.8 ~ 8.2, then adds respectively 10 ~ 30ppm coagulating agent, 0.5 ~ 2ppm flocculation agent to precipitate, and obtains supernatant liquor;
(e) filtration treatment: under pressure-driven, gained supernatant liquor in step (d) is obtained after uf processing to ultrafiltration and produce water and ultrafiltration dope, described ultrafiltration dope imports in rare nitrogen waste water;
(f) reverse-osmosis treated: under pressure-driven, gained ultrafiltration in step (e) is produced to water and carry out reverse osmosis concentration processing, obtain reverse osmosis produced water and reverse osmosis dope, described reverse osmosis dope repeats triple effect evaporation and processes, and described reverse osmosis produced water is removed NO through anion bed
3
-
and PO
4
3-
rear recycling.
2.
the treatment process of a kind of polycrystal silicon cell factory effluent according to claim 1, is characterized in that: supernatant liquor described in step (d) is first processed by sand filtration, dish filter, softening, bag filter before ultrafiltration.
3.
the treatment process of a kind of polycrystal silicon cell factory effluent according to claim 2, it is characterized in that: described sand filtration scavenging period is 200 ~ 400min, dish filter scavenging period is 20 ~ 40min, and softening scavenging period is 300 ~ 500min, and deep bed filter hole is 200 μ m.
4.
the treatment process of a kind of polycrystal silicon cell factory effluent according to claim 1, is characterized in that: described in step (d), supernatant liquor also carries out matting in uf processing, and the timed interval of described matting is 7-30 days.
5.
the treatment process of a kind of polycrystal silicon cell factory effluent according to claim 1, is characterized in that: reverse osmosis dope described in step (f) carried out a reverse osmosis concentration before carrying out triple effect evaporation processing again to be processed.
6.
the treatment process of a kind of polycrystal silicon cell factory effluent according to claim 5, is characterized in that: described two steps ro is processed the product water rate of recovery and is greater than respectively 65% and 50%.
7.
the treatment process of a kind of polycrystal silicon cell factory effluent according to claim 1, is characterized in that: the outer processing of the committee of precipitation described in salt, step (d) analysed in crystallization described in filter residue described in step (b), step (c).
8.
a kind of reclaiming system of polycrystal silicon cell factory effluent, it comprises interconnective dense nitrogen Waste Water Treatment (101) and rare nitrogen Waste Water Treatment (102), it is characterized in that: described dense nitrogen Waste Water Treatment (101) comprises the dense nitrogen wastewater equalization pond (1) connecting successively, reaction tank (2), filter-pressing device (3), filtrate collection pond (4), triple-effect evaporator (5), centrifugal separating device (6), described rare nitrogen Waste Water Treatment (102) comprises the rare nitrogen wastewater equalization pond (7) connecting successively, pH regulator groove (8), coagulation-flocculation groove (9), settling bath (10), intermediate pool (11), water tank with strainer (16), ultra-filtration equipment (17), reverse osmosis membrane apparatus (18), reuse collecting tank (19), anion bed (20), reuse water tank (21), wherein said filtrate collection pond (4) also respectively with centrifugal separating device (6), reverse osmosis membrane apparatus (18) is connected, and described triple-effect evaporator (5) is connected with rare nitrogen wastewater equalization pond (7), and described rare nitrogen wastewater equalization pond (7) is connected with ultra-filtration equipment (17).
9.
the reclaiming system of polycrystal silicon cell factory effluent according to claim 8, is characterized in that: between described intermediate pool (11) and water tank with strainer (16), be also connected with sand filter (12), disc filter (13), softening bed (14), deep bed filter (15) in turn.
10. the reclaiming system of polycrystal silicon cell factory effluent according to claim 8, is characterized in that: between described reverse osmosis membrane apparatus (18) and ultra-filtration equipment (17), be also provided with a set of reverse osmosis membrane apparatus (18 ').
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| CN105293800A (en) * | 2015-10-20 | 2016-02-03 | 四川科能锂电有限公司 | Lithium battery wastewater discharging treatment technology |
| CN105271612A (en) * | 2015-10-20 | 2016-01-27 | 四川科能锂电有限公司 | Circulating treatment system for lithium battery wastewater |
| CN110540316A (en) * | 2018-05-29 | 2019-12-06 | 中国石油化工股份有限公司 | Pretreatment method and application of ammoximation wastewater |
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Patent Citations (7)
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| DE10004590A1 (en) * | 1999-11-16 | 2001-05-31 | Joseph Maier | Waste water treatment, especially for use in the paper industry, comprises pre-treatment, eg by filtration or complex-former addition, prior to multistage membrane filtration and combustion of residues |
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