CN104230049B - A kind of method of wastewater treatment of photovoltaic industry - Google Patents
A kind of method of wastewater treatment of photovoltaic industry Download PDFInfo
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- CN104230049B CN104230049B CN201410441262.1A CN201410441262A CN104230049B CN 104230049 B CN104230049 B CN 104230049B CN 201410441262 A CN201410441262 A CN 201410441262A CN 104230049 B CN104230049 B CN 104230049B
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- waste water
- alkali
- wastewater treatment
- photovoltaic industry
- silicate
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Abstract
The present invention discloses a kind of method of wastewater treatment of photovoltaic industry, and step is: collect alkali-wash waste water and pickling waste waters respectively; Add in alkali-wash waste water and generate metal ion needed for silicate, metal ion reacts with the water glass in alkali-wash waste water and generates silicate precipitates, obtains filtrate by after silicate precipitates filtration; The filtrate of acquisition is added to regulate PH for 7.5-8.5 in pickling waste waters; In pickling waste waters, add coagulating agent and coagulant aids, obtain coagulating sedimentation thing; Coagulating sedimentation thing is carried out press filtration after concentration.Adopt the present invention that the colloidal solid in waste water can be made de-steady, follow-up wastewater treatment is more easily carried out.
Description
Technical field
The present invention relates to waste water treatment process, particularly relate to a kind of method of wastewater treatment of photovoltaic industry.
Background technology
In the process of producing silicon carbide, very large difference can be there is in the sewage quantity that different process sections, different time discharge and pollutent, wastewater source in this process mainly comprises reclaimed materials and soaks waste water, alkali-wash waste water, pickling waste waters and plant area's sanitary wastewater etc., and its principal character is that the intractability of alkali-wash waste water is larger.This difficulty is mainly manifested in: reclaimed materials, after the cleaning that is soaked in water, can throw the removal that alkali carries out the silicon-dioxide in raw material, because the water glass that silicon-dioxide meets alkali generation is water-soluble, then can wash by water and is removed.But just contain a large amount of water glass in waste water, and water glass can to make in water suspended substance dispersion evenly, colloidal particle are more stable, general conventional dose is difficult to make the colloidal solid in waste water de-steady as polymerize aluminum chloride, polyacrylamide, is therefore just difficult to the suspended substance removed with coagulation method in waste water.And the water treatment of routine is removed nothing more than being the method adopting filtration and precipitation in the method for suspended substance, but filter without de-steady waste water difficulty also very large.
In view of this, how to design that a kind of alkali-wash waste water can be made to take off steady method of wastewater treatment is the problem that industry desires most ardently solution.
Summary of the invention
The object of the invention is to the deficiency overcoming the existence of above-mentioned prior art, a kind of method of wastewater treatment of photovoltaic industry is provided, to make the colloidal solid in waste water de-steady, reduce the difficulty of subsequent disposal.
The present invention is realized by following technical proposal: a kind of method of wastewater treatment of photovoltaic industry, and wherein, step is:
(a): collect alkali-wash waste water and pickling waste waters respectively;
(b): add in described alkali-wash waste water and generate metal ion needed for silicate, described metal ion reacts with the described water glass in described alkali-wash waste water and generates silicate precipitates, obtains filtrate by after described silicate precipitates filtration;
(c): in described pickling waste waters, add the described filtrate of acquisition in described step (b) to regulate PH for 7.5-8.5;
D (): in the described pickling waste waters processed through described step (c), add coagulating agent and coagulant aids, obtains coagulating sedimentation thing;
(e): the described coagulating sedimentation thing obtained in described step (d) is carried out press filtration after concentration.
Preferably, the described metal ion added in described step (b) is calcium ion and/or magnesium ion.
Preferably, described calcium ion in described step (b) by adding calcium oxide in described alkali-wash waste water, described calcium oxide and water react and generate calcium hydroxide and obtain, and the described water glass in described calcium hydroxide and described alkali-wash waste water reacts and generates precipitated calcium silicate.
Preferably, the described magnesium ion in described step (b) obtains by adding magnesium chloride in described alkali-wash waste water, and the described water glass in described magnesium chloride and described alkali-wash waste water reacts and generates Magnesium Silicate q-agent and precipitate.
Preferably, the coagulating agent in described step (d) comprise in polymerize aluminum chloride, aluminum chloride, Tai-Ace S 150 or polyaluminium sulfate any one.
Preferably, the mass concentration of the described coagulating agent in described step (d) is 5-10%.
Preferably, the mass concentration of the described coagulant aids in described step (d) is 1 ‰-3 ‰, and described coagulant aids is polyacrylamide.
Preferably, it is characterized in that, described step (b) is carried out in settling tank, and described settling tank is agitated pool.
Preferably, in described settling tank, hydraulic load is 0.2-0.5mm/s, and the residence time is 1.5-4 hour.
Preferably, mud scraper is also provided with in described settling tank to prevent line clogging.
Compared with the prior art, the substantive distinguishing features that has of the present invention and marked improvement are:
The present invention by adding metal ion in alkali-wash waste water, water glass in this metal ion and alkali-wash waste water reacts and generates silicate precipitates, make the colloidal solid in waste water de-steady, the subsequent disposal of alkali-wash waste water is become be more prone to, and then precipitated further by the method for coagulation, thus greatly reduce the content of the suspended substance in alkali-wash waste water.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the flow chart of steps of the method for wastewater treatment according to photovoltaic industry of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the flow chart of steps of the method for wastewater treatment according to photovoltaic industry of the present invention.With reference to Fig. 1,
First, step S10: collect alkali-wash waste water and pickling waste waters respectively.Alkali-wash waste water is collected in alkaline waste water pond respectively, pickling waste waters is collected in acid waste water pond.
Then, step S20: the water glass added in metal ion and alkali-wash waste water reacts and generates silicate precipitates, and filter acquisition filtrate.Alkali-wash waste water in alkali-wash waste water pond is passed in settling tank and reacts, the metal ion generated needed for silicate is added in settling tank, the metal ion added can be calcium ion, also can be magnesium ion, can also be the mixture of calcium ion and magnesium ion, wherein, calcium ion can by adding calcium oxide in alkali-wash waste water, calcium oxide and water react and generate calcium hydroxide and obtain, and the water glass in calcium hydroxide and alkali-wash waste water reacts and generates precipitated calcium silicate.Magnesium ion then can obtain by adding magnesium chloride in alkali-wash waste water, and the water glass in magnesium chloride and alkali-wash waste water reacts and generates Magnesium Silicate q-agent and precipitate, certainly not as limit, as long as can realize object.Mix as soon as possible with alkali-wash waste water to allow the calcium oxide that adds and/or magnesium chloride, settling tank can be agitated pool, in addition, in order to prevent the impurity blocking spoil disposal pipeline contained in the silicate precipitates that generates and calcium oxide and/or magnesium chloride, cause and rely on hydrostaticpressure cannot spoil disposal, mud scraper can be set in settling tank to avoid line clogging.Should be noted, the hydraulic load in settling tank can not be too large, and be generally 0.2-0.5mm/s, the time stopped in settling tank can not be too short, general stop 1.5-4 hour.The silicate precipitates of generation is carried out filtration and obtain filtrate.
Next, step S30: add filtrate to regulate the PH of pickling waste waters.In pickling waste waters, add the filtrate obtained in step S20, make the PH of pickling waste waters be adjusted to about 8, such as 7.5-8.5.
Continue, step S40: add coagulating agent and coagulant aids acquisition coagulating sedimentation thing.In the pickling waste waters through step S30 process, add coagulating agent and coagulant aids, to make the further coagulating sedimentation of pickling waste waters, and obtain coagulating sedimentation thing.Wherein, the mass concentration of coagulating agent is 5-10%, and the mass concentration of coagulant aids is 1 ‰-3 ‰.Coagulating agent can be polymerize aluminum chloride, can certainly be any one in aluminum chloride, Tai-Ace S 150 or polyaluminium sulfate, but therefore not be limited, as long as can be effective.Coagulant aids can be polyacrylamide, but is not therefore limited, as long as can be effective.
Finally, step S50: concentrated, press filtration.The coagulating sedimentation thing obtained in step S40 is passed into sludge thickener concentrate, and then carry out press filtration process.
Embodiment 1
Be collected in by alkali-wash waste water in alkaline waste water pond respectively, pickling waste waters is collected in acid waste water pond.Alkali-wash waste water in alkali-wash waste water pond is passed in settling tank, calcium oxide is added in settling tank, mix as soon as possible with alkali-wash waste water to allow calcium oxide, settling tank is designed to agitated pool, calcium oxide runs into water reaction and generates calcium hydroxide, metso in the calcium hydroxide generated and alkali-wash waste water reacts and generates precipitated calcium silicate, in addition, in settling tank, can mud scraper be set, to avoid the impurity blocking spoil disposal pipeline contained in the precipitated calcium silicate of generation and calcium oxide, cause and rely on hydrostaticpressure cannot spoil disposal, hydraulic load in settling tank is 0.2mm/s, stop 1.5 hours in settling tank.The precipitated calcium silicate generated is filtered, and collects filtrate.In pickling waste waters, add the filtrate of collecting, make the PH of pickling waste waters be adjusted to 8.In the pickling waste waters after adjustment PH, add polymerize aluminum chloride and polyacrylamide, to make the further coagulating sedimentation of pickling waste waters, and obtain coagulating sedimentation thing, wherein, the mass concentration of polymerize aluminum chloride is 5%, and the mass concentration of polyacrylamide is 1 ‰.Finally coagulating sedimentation thing is passed into sludge thickener carry out concentrated after carry out press filtration process.
Embodiment 2
Be collected in by alkali-wash waste water in alkaline waste water pond respectively, pickling waste waters is collected in acid waste water pond.Alkali-wash waste water in alkali-wash waste water pond is passed in settling tank, magnesium chloride is added in settling tank, mix as soon as possible with alkali-wash waste water to allow magnesium chloride, settling tank is designed to agitated pool, metso in magnesium chloride and alkali-wash waste water reacts and generates Magnesium Silicate q-agent and precipitate, in addition, in settling tank, can mud scraper be set, the impurity blocking spoil disposal pipeline precipitated to avoid the Magnesium Silicate q-agent generated and contain in magnesium chloride, cause and rely on hydrostaticpressure cannot spoil disposal, hydraulic load in settling tank is 0.5mm/s, stops 4 hours in settling tank.By the Magnesium Silicate q-agent sedimentation and filtration generated, and collect filtrate.In pickling waste waters, add the filtrate of collecting, make the PH of pickling waste waters be adjusted to 8.5.In the pickling waste waters after adjustment PH, add polyaluminium sulfate and polyacrylamide, to make the further coagulating sedimentation of pickling waste waters, and obtain coagulating sedimentation thing, wherein, the mass concentration of polymerize aluminum chloride is 10%, and the mass concentration of polyacrylamide is 3 ‰.Finally coagulating sedimentation thing is passed into sludge thickener carry out concentrated after carry out press filtration process.
Embodiment 3
Be collected in by alkali-wash waste water in alkaline waste water pond respectively, pickling waste waters is collected in acid waste water pond.Alkali-wash waste water in alkali-wash waste water pond is passed in settling tank, calcium oxide and magnesium chloride is added in settling tank, in order to allow calcium oxide, magnesium chloride mixes as soon as possible with alkali-wash waste water, settling tank is designed to agitated pool, calcium oxide runs into water reaction and generates calcium hydroxide, metso in the calcium hydroxide generated and alkali-wash waste water reacts and generates precipitated calcium silicate, metso in magnesium chloride and alkali-wash waste water reacts and generates Magnesium Silicate q-agent and precipitate, in addition, in settling tank, can mud scraper be set, to avoid the Calucium Silicate powder generated, Magnesium Silicate q-agent precipitation and calcium oxide, the impurity blocking spoil disposal pipeline contained in magnesium chloride, cause and rely on hydrostaticpressure cannot spoil disposal, hydraulic load in settling tank is 0.4mm/s, stop 2.5 hours in settling tank.By the Calucium Silicate powder, the Magnesium Silicate q-agent sedimentation and filtration that generate, and collect filtrate.In pickling waste waters, add the filtrate of collecting, make the PH of pickling waste waters be adjusted to 7.5.In the pickling waste waters after adjustment PH, add polymerize aluminum chloride and polyacrylamide, to make the further coagulating sedimentation of pickling waste waters, and obtain coagulating sedimentation thing, wherein, the mass concentration of polymerize aluminum chloride is 8%, and the mass concentration of polyacrylamide is 2 ‰.Finally coagulating sedimentation thing is passed into sludge thickener carry out concentrated after carry out press filtration process.
Compared with the prior art, the substantive distinguishing features that has of the present invention and marked improvement are:
The present invention by adding metal ion in alkali-wash waste water, water glass in this metal ion and alkali-wash waste water reacts and generates silicate precipitates, make the colloidal solid in waste water de-steady, the subsequent disposal of alkali-wash waste water is become be more prone to, and then precipitated further by the method for coagulation, thus greatly reduce the content of the suspended substance in alkali-wash waste water.
More than show and describe ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification sheets just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (10)
1. a method of wastewater treatment for photovoltaic industry, is characterized in that, step is:
(a): collect alkali-wash waste water and pickling waste waters respectively;
(b): add in described alkali-wash waste water and generate metal ion needed for silicate, described metal ion reacts with the water glass in described alkali-wash waste water and generates silicate precipitates, obtains filtrate by after described silicate precipitates filtration;
(c): in described pickling waste waters, add the described filtrate of acquisition in described step (b) to regulate pH for 7.5-8.5;
D (): in the described pickling waste waters processed through described step (c), add coagulating agent and coagulant aids, obtains coagulating sedimentation thing;
(e): the described coagulating sedimentation thing obtained in described step (d) is carried out press filtration after concentration.
2. the method for wastewater treatment of photovoltaic industry as claimed in claim 1, it is characterized in that, the described metal ion added in described step (b) is calcium ion and/or magnesium ion.
3. the method for wastewater treatment of photovoltaic industry as claimed in claim 2, it is characterized in that, described calcium ion in described step (b) by adding calcium oxide in described alkali-wash waste water, described calcium oxide and water react and generate calcium hydroxide and obtain, and the described water glass in described calcium hydroxide and described alkali-wash waste water reacts and generates precipitated calcium silicate.
4. the method for wastewater treatment of photovoltaic industry as claimed in claim 2, it is characterized in that, described magnesium ion in described step (b) obtains by adding magnesium chloride in described alkali-wash waste water, and the described water glass in described magnesium chloride and described alkali-wash waste water reacts and generates Magnesium Silicate q-agent and precipitate.
5. the method for wastewater treatment of photovoltaic industry as claimed in claim 1, is characterized in that, the coagulating agent in described step (d) comprise in polymerize aluminum chloride, aluminum chloride, Tai-Ace S 150 or polyaluminium sulfate any one.
6. the method for wastewater treatment of photovoltaic industry as claimed in claim 1, it is characterized in that, the mass concentration of the described coagulating agent in described step (d) is 5-10%.
7. the method for wastewater treatment of photovoltaic industry as claimed in claim 1, it is characterized in that, the mass concentration of the described coagulant aids in described step (d) is 1 ‰-3 ‰, and described coagulant aids is polyacrylamide.
8. the method for wastewater treatment of the photovoltaic industry as described in any one of claim 1 to 7, is characterized in that, described step (b) is carried out in settling tank, and described settling tank is agitated pool.
9. the method for wastewater treatment of photovoltaic industry as claimed in claim 8, it is characterized in that, in described settling tank, hydraulic load is 0.2-0.5mm/s, and the residence time is 1.5-4 hour.
10. the method for wastewater treatment of photovoltaic industry as claimed in claim 8, is characterized in that, be also provided with mud scraper to prevent line clogging in described settling tank.
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| CN107686189A (en) * | 2017-09-04 | 2018-02-13 | 长沙湘朴科技有限公司 | A kind of flotation tungsten ore mine tailing wastewater processing method |
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| CN102234159A (en) * | 2010-04-23 | 2011-11-09 | 保定市凯斯达科技有限公司 | Fluoride removing technology for wastewater discharged from polysilicon solar photovoltaic cell productions |
| CN103011453A (en) * | 2012-12-08 | 2013-04-03 | 北京国环清华环境工程设计研究院有限公司 | Processing method for fluoride waste water in production of solar cells |
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| CN102234159A (en) * | 2010-04-23 | 2011-11-09 | 保定市凯斯达科技有限公司 | Fluoride removing technology for wastewater discharged from polysilicon solar photovoltaic cell productions |
| CN103011453A (en) * | 2012-12-08 | 2013-04-03 | 北京国环清华环境工程设计研究院有限公司 | Processing method for fluoride waste water in production of solar cells |
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