CN110092519A - A kind of silica gel wastewater treatment method - Google Patents
A kind of silica gel wastewater treatment method Download PDFInfo
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- CN110092519A CN110092519A CN201910393783.7A CN201910393783A CN110092519A CN 110092519 A CN110092519 A CN 110092519A CN 201910393783 A CN201910393783 A CN 201910393783A CN 110092519 A CN110092519 A CN 110092519A
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- Prior art keywords
- nanofiltration
- silica gel
- ultrafiltration
- filters pressing
- wastewater treatment
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- 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
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- 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
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention discloses a kind of silica gel wastewater treatment method, including interspersed mutually filters pressing twice, two times of ultrafiltration, three times nanofiltration and evaporative crystallization.The beneficial effects of the present invention are: silica gel wastewater treatment method technique of the present invention is recyclable, zero-emission can be realized, water, silica gel and the inorganic salts in silica gel waste water can be recycled；Other any medicaments are no longer added other than adding pH Auto-regulator in technical process, are also not introduced into other impurities, process integration height saves cost；Silica gel wastewater treatment method of the present invention carries out the pretreatment of silica gel waste water using enhanced submerged ultrafiltration, does not have to the pH for adjusting silica gel waste water early period, but nanofiltration production water tune pH can be played pretreated purpose.
Description
Technical field
The present invention relates to wastewater treatment more particularly to a kind of silica gel wastewater treatment methods.
Background technique
Silica gel waste water produced during the preparation process is mainly from silica gel pickling link, and pickling waste waters acidity is high, and pH value is in 2-
3, wherein causing pickling waste waters to be difficult to handle containing a large amount of sulfate and silicate and remaining silica gel.
Existing silica gel pickling waste waters treatment process is usually first to adjust pH with quick lime, and flocculant is then added, such as polymerize
Aluminium chloride, poly-ferric chloride, polyacrylamide etc. make silicon-containing wastewater flocculation sedimentation, then carry out filters pressing, will be separated by solid-liquid separation.On
A large amount of solid waste can be generated by stating treatment process, and a large amount of calcium, magnesium addition are introduced in waste water, be increased for subsequent processing
The problems such as more burden, there are low efficiencys, at high cost, poor processing effect.
Summary of the invention
The present invention is directed to existing silica gel pickling waste waters treatment process low efficiency, problem at high cost and poor effect, provides one
Kind silica gel wastewater treatment method.
The technical scheme to solve the above technical problems is that a kind of silica gel wastewater treatment method, which is characterized in that
The following steps are included:
1) filters pressing: carrying out silica gel waste water to staticly settle processing, carries out pressure filtration to waste water since bottom, will
Bulky grain silica gel particle filters pressing separation in waste water；
2) ultrafiltration is submerged: by immersion ultrafiltration apparatus after step 1) supernatant and filters pressing filtrate are mixed, by little particle
Insoluble matter precipitation and separation；
3) ultrafiltration: step 2) submergence ultrafiltration is produced into water, hyperfiltration treatment is carried out by pillar ultrafiltration membrane；
4) nanofiltration: step 3) ultrafiltration is produced by water using conventional nanofiltration membrane and carries out a nanofiltration；
5) secondary nanofiltration: nanofiltration concentrated water of step 4) is carried out by secondary nanofiltration using high pressure nanofiltration membrane, by secondary nanofiltration
Concentrated water adjusts pH between 6-7；
6) secondary filters pressing: the secondary nanofiltration concentrated water after step 5) to be adjusted to pH carries out filters pressing, and filters pressing obtained solid is recycled；
7) nanofiltration three times: producing water for a nanofiltration of step 4) and the secondary nanofiltration of step 5) produce water and mixes, adjust pH to 6-7 it
Between after, carry out nanofiltration, will three times nanofiltration produce water recycling；
8) evaporation recycling: being evaporated crystallization to concentrated water obtained by filtrate obtained by step 6) filters pressing and step 7) nanofiltration respectively,
Solid and condensed water after recycling evaporation.
A filters pressing pressure is 0-0.6MPa in step 1) of the present invention, and the secondary filters pressing pressure of step 6) is 0-0.6MPa；Step
Rapid 4) nanofiltration pressure is not higher than 4MPa, and the secondary nanofiltration pressure of step 5) is not higher than 8MPa, and nanofiltration pressure is not three times for step 7)
Higher than 8MPa.
For the difference of grain graininess in each step waste water, the present invention uses different ultrafiltration membranes, specifically: in step 2)
The immersion ultrafiltration system uses negative-pressure ward operation mode, and ultrafiltration membrane aperture used in immersion ultrafiltration apparatus is 0.02-
0.04 μm, the submerged ultrafiltration material is Kynoar, polysulfones, polyether sulfone, polyacrylonitrile, polyamide or acetate fiber
One of element or several mixing；Pillar Average Pore Size of UF Membrane described in step 3) is 0.001-0.01 μm, the column
Formula ultrafiltration membrane material is one of Kynoar, polysulfones, polyether sulfone, polyacrylonitrile or cellulose acetate or several mixed
It closes.
There are still effluent parts in the particle isolated, in order to realize that the purpose of zero-emission, the present invention are also needed to the part
Sewage treatment, into being further processed in big process, specifically: by the bulky grain silica gel particle and step of step 1) filters pressing separation
2) the little particle insoluble mixing of precipitation and separation, filters pressing recycling walk after mixing gained filtrate with step 1) filters pressing filtrate
It is rapid 2) to submerge ultrafiltration；Step 8) is carried out again after concentrated water obtained by step 7) nanofiltration is carried out nanofiltration or reverse osmosis concentration more than three times
Evaporation recycling.
The present invention only introduces sodium hydroxide and adjusts pH, and to control the concentration of waste water, specifically: the secondary nanofiltration institute of step 5)
It obtains soluble inorganic salinity in concentrated water and is not less than 15wt%；It is sodium hydroxide that step 5) and step 7), which adjust substance used in pH,.
The beneficial effects of the present invention are: silica gel wastewater treatment method technique of the present invention is recyclable, zero-emission, energy can be realized
The enough water by silica gel waste water, silica gel and inorganic salts recycle；It is no longer added other than adding pH Auto-regulator in technical process
Other any medicaments, are also not introduced into other impurities, and process integration height saves cost；Silica gel wastewater treatment method of the present invention uses
Enhanced submerged ultrafiltration carries out the pretreatment of silica gel waste water, does not have to the pH for adjusting silica gel waste water early period, but nanofiltration is produced
Water tune pH can play pretreated purpose.
Specific embodiment
Below in conjunction with example, present invention is described, and the given examples are served only to explain the present invention, is not intended to limit this
The range of invention.
The silica gel that amount of silica gel is 0.52%, salt content 2-3%, pH is 2-3 produces waste water, totally 10 tons, carries out nothing to it
Evilization recovery processing, specific steps are as follows:
1) filters pressing: introducing sedimentation basin for waste water, after staticly settling 1h, by bottom more waste water containing sediment extract out into
Row pressure filtration, filters pressing pressure are 0.4MPa, isolate aqueous bulky grain silica gel particle slurry 200kg；
2) it submerges ultrafiltration: using negative-pressure ward operation mode, ultrafiltration membrane aperture used in immersion ultrafiltration apparatus is 0.0341 μ
M, submerged ultrafiltration material are Kynoar, are set after step 1) supernatant and filters pressing filtrate are mixed by immersion ultrafiltration
It is standby, by little particle insoluble precipitation and separation, little particle insoluble slurry 100kg is isolated, the aqueous bulky grain with step 1)
Filters pressing after the mixing of silica gel particle slurry repeats step 2) and submerges ultrafiltration, follows after mixing gained filtrate with step 1) filters pressing filtrate
Solid silicone particle 42kg is recycled after ring 2 times altogether；
3) ultrafiltration: step 2) submergence ultrafiltration is produced into water, ultrafiltration, pillar Average Pore Size of UF Membrane is carried out by pillar ultrafiltration membrane
It is 0.001 μm, pillar ultrafiltration membrane material is polyacrylonitrile；
4) nanofiltration: step 3) ultrafiltration is produced by water using conventional nanofiltration membrane and carries out a nanofiltration, nanofiltration pressure is
3.5MPa；
5) secondary nanofiltration: nanofiltration concentrated water of step 4) is carried out by secondary nanofiltration using high pressure nanofiltration membrane, nanofiltration pressure is
Secondary nanofiltration concentrated water is adjusted pH to 6.8 with 0.65kg sodium hydroxide by 7MPa, and sampling measures inorganic salt concentration in waste water and is
22.3wt%；
6) secondary filters pressing: the secondary nanofiltration concentrated water after step 5) to be adjusted to pH carries out filters pressing, pressure 0.4MPa, recycling
7kg solid silicone particle；
7) nanofiltration three times: a nanofiltration of step 4) is produced into water and the secondary nanofiltration of step 5) produces water and mixes, with 1.42kg hydrogen-oxygen
Change sodium and adjust pH to 6.5, carry out nanofiltration, nanofiltration pressure 7MPa nanofiltration will produce water recycling three times；
8) evaporation recycling: being evaporated crystallization to concentrated water obtained by filtrate obtained by step 6) filters pressing and step 7) nanofiltration respectively,
It is recovered to solid silicone particle 1kg from step 6) filtrate, soluble inorganic salt 280kg is crystallized from step 7) concentrated water, wherein
Sodium sulphate purity is up to 98.68%.
Entire removal process recycles solid silicone particle 50kg, the rate of recovery 96.15% altogether.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of silica gel wastewater treatment method, which comprises the following steps:
1) filters pressing: carrying out silica gel waste water to staticly settle processing, pressure filtration is carried out to waste water since bottom, by waste water
In bulky grain silica gel particle filters pressing separation；
2) ultrafiltration is submerged: by immersion ultrafiltration apparatus after step 1) supernatant and filters pressing filtrate are mixed, little particle is insoluble
Object precipitation and separation；
3) ultrafiltration: step 2) submergence ultrafiltration is produced into water, hyperfiltration treatment is carried out by pillar ultrafiltration membrane；
4) nanofiltration: step 3) ultrafiltration is produced by water using conventional nanofiltration membrane and carries out a nanofiltration；
5) secondary nanofiltration: nanofiltration concentrated water of step 4) is carried out by secondary nanofiltration using high pressure nanofiltration membrane, by secondary nanofiltration concentrated water
PH is adjusted between 6-7；
6) secondary filters pressing: the secondary nanofiltration concentrated water after step 5) to be adjusted to pH carries out filters pressing, and filters pressing obtained solid is recycled；
7) nanofiltration three times: a nanofiltration of step 4) is produced into water and the secondary nanofiltration of step 5) produces water and mixes, adjusts pH between 6-7
Afterwards, nanofiltration is carried out, nanofiltration will produce water recycling three times；
8) evaporation recycling: crystallization is evaporated to concentrated water obtained by filtrate obtained by step 6) filters pressing and step 7) nanofiltration respectively, is recycled
Solid and condensed water after evaporation.
2. silica gel wastewater treatment method according to claim 1, which is characterized in that filters pressing pressure of step 1) is 0-
0.6MPa, the secondary filters pressing pressure of step 6) are 0-0.6MPa.
3. silica gel wastewater treatment method according to claim 1, which is characterized in that the bulky grain for separating step 1) filters pressing
The little particle insoluble of silica gel particle and step 2) precipitation and separation mixing, filters pressing recycling, gained filtrate and step 1) filters pressing are filtered
Step 2), which is carried out, after liquid mixing submerges ultrafiltration.
4. silica gel wastewater treatment method according to claim 1, which is characterized in that the system of immersion ultrafiltration described in step 2)
System uses negative-pressure ward operation mode, and ultrafiltration membrane aperture used in immersion ultrafiltration apparatus is 0.02-0.04 μm, and the immersion is super
Filter membrane material is one of Kynoar, polysulfones, polyether sulfone, polyacrylonitrile, polyamide or cellulose acetate or several
Mixing.
5. silica gel wastewater treatment method according to claim 1, which is characterized in that pillar ultrafiltration membrane described in step 3) is flat
Equal aperture is 0.001-0.01 μm, and the pillar ultrafiltration membrane material is Kynoar, polysulfones, polyether sulfone, polyacrylonitrile or vinegar
One of acid cellulose or several mixing.
6. silica gel wastewater treatment method according to claim 1, which is characterized in that nanofiltration pressure of step 4) is not higher than
4MPa, the secondary nanofiltration pressure of step 5) are not higher than 8MPa, and nanofiltration pressure is not higher than 8MPa to step 7) three times.
7. silica gel wastewater treatment method according to claim 1, which is characterized in that in concentrated water obtained by the secondary nanofiltration of step 5)
Soluble inorganic salinity is not less than 15wt%.
8. silica gel wastewater treatment method according to claim 1, which is characterized in that step 5) and step 7) are adjusted used in pH
Substance is sodium hydroxide.
9. silica gel wastewater treatment method according to claim 1, which is characterized in that carry out concentrated water obtained by step 7) nanofiltration
Step 8) evaporation recycling is carried out again after nanofiltration or reverse osmosis concentration more than three times.
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| CN201910393783.7A CN110092519B (en) | 2019-05-13 | 2019-05-13 | Silica gel wastewater treatment method |
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| CN201910393783.7A CN110092519B (en) | 2019-05-13 | 2019-05-13 | Silica gel wastewater treatment method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112645520A (en) * | 2020-11-10 | 2021-04-13 | 常熟市电热合金材料厂有限公司 | Recycling method of sludge press-filtration wastewater |
| CN113429053A (en) * | 2021-07-21 | 2021-09-24 | 山东金汇膜科技股份有限公司 | Silica gel wastewater recycling treatment method |
| CN115784241A (en) * | 2022-12-29 | 2023-03-14 | 山东金汇膜科技股份有限公司 | Method for recovering silica gel and sodium sulfate from silica gel wastewater and recycling water |
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| CN102689999A (en) * | 2012-04-25 | 2012-09-26 | 浙江省海洋开发研究院 | Resourceful treatment method for silica gel waste water |
| CN103482809A (en) * | 2013-08-26 | 2014-01-01 | 厦门世达膜科技有限公司 | Technology for realizing zero discharge of waste water caused by white carbon black production |
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2019
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Patent Citations (3)
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| CN102689999A (en) * | 2012-04-25 | 2012-09-26 | 浙江省海洋开发研究院 | Resourceful treatment method for silica gel waste water |
| CN103482809A (en) * | 2013-08-26 | 2014-01-01 | 厦门世达膜科技有限公司 | Technology for realizing zero discharge of waste water caused by white carbon black production |
| CN108059213A (en) * | 2017-09-22 | 2018-05-22 | 内蒙古久科康瑞环保科技有限公司 | The combination nanofiltration of high-recovery and high sulfate radical rejection divides salt technique and system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112645520A (en) * | 2020-11-10 | 2021-04-13 | 常熟市电热合金材料厂有限公司 | Recycling method of sludge press-filtration wastewater |
| CN113429053A (en) * | 2021-07-21 | 2021-09-24 | 山东金汇膜科技股份有限公司 | Silica gel wastewater recycling treatment method |
| CN113429053B (en) * | 2021-07-21 | 2022-04-22 | 山东金汇膜科技股份有限公司 | Silica gel wastewater recycling treatment method |
| CN115784241A (en) * | 2022-12-29 | 2023-03-14 | 山东金汇膜科技股份有限公司 | Method for recovering silica gel and sodium sulfate from silica gel wastewater and recycling water |
| CN115784241B (en) * | 2022-12-29 | 2023-06-16 | 山东金汇膜科技股份有限公司 | Method for recycling silica gel, sodium sulfate and water from silica gel wastewater |
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