CN115872572A - Method for treating cleaning degumming wastewater and redundant slicing wastewater - Google Patents
Method for treating cleaning degumming wastewater and redundant slicing wastewater Download PDFInfo
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- CN115872572A CN115872572A CN202310112368.6A CN202310112368A CN115872572A CN 115872572 A CN115872572 A CN 115872572A CN 202310112368 A CN202310112368 A CN 202310112368A CN 115872572 A CN115872572 A CN 115872572A
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- 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
- Y02W10/10—Biological treatment of water, waste water, or sewage
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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
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Abstract
The invention discloses a method for treating cleaning degumming wastewater and redundant slicing wastewater, which belongs to the field of sewage treatment and comprises the following steps of S1: carrying out solid-liquid separation on the degumming wastewater and transferring the supernatant to a regulating tank to obtain pretreated degumming wastewater; s2: mixing the slice wastewater with the pretreated degumming wastewater in the regulating tank, transferring the mixture to a coagulation reaction tank, then carrying out pH regulation, adding a coagulant, fully coagulating the mixture and carrying out solid-liquid separation again; s3: transferring the supernatant separated in the S2 to a hydrolysis acidification tank, performing hydrolysis acidification, and then transferring the wastewater subjected to hydrolysis acidification to an aerobic tank for aerobic treatment; s4: the wastewater after the aerobic treatment is precipitated to obtain the drainable wastewater, the invention uses the hydrolysis acidification and aerobic process to treat the wastewater, the hydrolysis acidification tank without filler is used for treating the wastewater, the biodegradability of the wastewater is improved, partial COD is removed, and the COD concentration in the drainable wastewater is greatly reduced by matching with the oxidation ditch type treatment.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method for treating cleaning degumming wastewater and redundant slicing wastewater.
Background
Silicon is a very common element, but the silicon rarely appears in nature in the form of a simple substance, but widely exists in rock, gravel and dust in the form of complex silicate or silicon dioxide, the content of the silicon element in the earth crust reaches 25.8%, and an inexhaustible source is provided for the production of monocrystalline silicon. Therefore, research and development of efficient, practical and economical treatment processes become an important issue required by enterprises at present.
Disclosure of Invention
The invention aims to provide a method for treating cleaning and degumming wastewater and redundant slicing wastewater, so as to solve one of the defects caused by the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for treating cleaning degumming wastewater and redundant slicing wastewater comprises the following steps:
s1: carrying out solid-liquid separation on the degumming wastewater and transferring the supernatant to a regulating tank to obtain pretreated degumming wastewater;
s2: mixing the slice wastewater with the pretreated degumming wastewater in the regulating tank, transferring the mixture to a coagulation reaction tank, then carrying out pH regulation, adding a coagulant, fully coagulating, and carrying out solid-liquid separation again;
s3: transferring the supernatant separated in the step S2 to a hydrolysis acidification tank, performing hydrolysis acidification, and then transferring the wastewater subjected to hydrolysis acidification to an aerobic tank for aerobic treatment;
s4: precipitating the wastewater after the aerobic treatment to obtain drainable wastewater.
And in the step S3, a hydrolysis acidification pool without filler is adopted to degrade refractory organic matters in the wastewater, so that the efficiency and effect of subsequent aerobic treatment are ensured.
And the hydrolysis acidification tank in the S3 adopts an up-flow mode, silicon powder is further precipitated by utilizing the flocculation effect of activated sludge, and partial silicon-containing sludge is periodically discharged after the activated sludge is adsorbed by internal circulation, so that the aerobic treatment effect of the silicon powder is reduced.
The aerobic treatment in the S3 adopts an oxidation ditch form to increase the diversity and the flexibility of the process treatment.
And (3) carrying out squeezing and filtering treatment on the silicon-containing sludge generated by solid-liquid separation in the S1 and the S2, wherein the sludge after pressure filtration can be recycled or sold for sale, and the pressure filtrate is discharged into a degumming wastewater adjusting tank.
And (4) transferring the biochemical sludge precipitated in the step (S4) to a biochemical sludge storage tank, adding a flocculating agent to temper the sludge, performing squeezing filtration to perform sludge dewatering, collecting the sludge after filter pressing, transporting the sludge outwards, and discharging the pressure filtrate into a degumming wastewater adjusting tank.
In the step S2, liquid alkali or acid is used for pH adjustment, and PAC (polyaluminium chloride) or PAM (polyacrylamide) is used as a coagulant.
According to the technical scheme, the invention has at least the following effects:
the invention adopts the processes of coagulating sedimentation, hydrolytic acidification and aerobic treatment, the hydrolytic acidification can improve the biochemical property of the wastewater, the aerobic process can remove organic pollutants in the wastewater, the wastewater can increase the removal rate of COD (chemical oxygen demand) by the treatment of the process, and the COD concentration in the wastewater can be reduced, so as to meet the strict standard discharge requirement.
The hydrolysis acidification pool which contains no filler for hydrolysis acidification degrades refractory organic matters in the wastewater, improves the biodegradability of the wastewater and removes partial COD, ensures the efficiency and effect of subsequent aerobic treatment, and carries out aerobic treatment on the wastewater after hydrolysis acidification to remove most of COD, thereby greatly reducing the COD concentration in the dischargeable waste liquid;
in addition, the invention also treats the sludge generated by solid-liquid separation of the wastewater in each stage, the silicon-containing sludge is directly subjected to filter pressing and recovery, a flocculating agent is added to modify the sludge before biochemical sludge filter pressing, and the generated waste liquid is separately collected, so that the benefit is maximized, and the operation cost is reduced under the condition of ensuring discharge reaching the standard.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
The slicing wastewater contains cutting fluid and silicon powder, the degumming and cleaning wastewater also contains lactic acid, cleaning agent and the like besides the silicon powder, and as the content of the silicon powder in the wastewater is higher, the wastewater is firstly subjected to filter pressing nearby a workshop to remove most silicon powder SS (suspended solid), and then is pumped into a wastewater station for further treatment.
Pretreatment of degumming/silicon wafer cleaning wastewater
The slice wastewater after filter pressing is fully mixed with degumming and cleaning wastewater in a comprehensive regulating tank, and after the ultrafine suspended matters such as silicon powder and the like are further removed through coagulating sedimentation, the subsequent biochemical treatment is carried out. The mixed wastewater contains refractory substances such as polyether, high molecular surfactant and the like, and hydrolysis is needed to improve the biodegradability of the wastewater; meanwhile, the COD (organic pollutants) content of the production wastewater is not high, so the treatment can reach the standard by adopting a hydrolytic acidification and aerobic process.
The principle of hydrolytic acidification is to hydrolyze macromolecular and nondegradable organic matters into micromolecular and easily degradable organic matters, thereby improving the biochemical property of the incoming water. The conventional hydrolytic acidification with and without filler, without clogging of the solid suspension
In the case of the filler, the filler is placed so that microorganisms can be attached to the filler, macromolecular substances are trapped and degraded into small molecular substances, and the treatment capacity is better than that in the case of no filler.
Because the waste water contains refractory substances, the waste water needs to be sufficiently hydrolyzed and acidified, and insoluble organic substances are hydrolyzed into soluble substances under the action of hydrolytic bacteria, so that macromolecular substances are converted into micromolecular substances, and the biodegradability of the waste water is improved. The scheme adopts the hydrolysis acidification tank without filler to degrade refractory organic matters in the wastewater, improves the biodegradability of the wastewater, removes partial COD, and ensures the efficiency and effect of subsequent aerobic treatment
Because the wastewater is characterized by containing extremely fine silicon powder, the silicon powder is difficult to precipitate, in order to reduce aerobic load, the hydrolysis acidification tank is designed into an up-flow type, the silicon powder is further precipitated by utilizing the flocculation effect of activated sludge, and after the activated sludge is absorbed by internal circulation, partial silicon-containing sludge is periodically discharged, so that the influence of the silicon powder on subsequent aerobic biochemical treatment is minimized.
Aerobic process
The activated sludge process is a biological treatment of wastewater mainly consisting of activated sludge. It is formed by introducing sufficient air into the tank to culture a large number of aerobic microorganisms to form sludge-like flocs. The microorganisms mainly including zoogloea inhabit on the microbial pool, and have strong capability of adsorbing and oxidizing organic matters.
The process is characterized in that:
the activated sludge is completely mixed with the high-concentration organic wastewater in the tank and is in a suspended state. Removing organic matter by the zoogloea formed by microorganism.
Under the condition of sufficient dissolved oxygen, the activated sludge carries out high-load adsorption degradation on high-concentration organic matters, and a large amount of pollutants are further removed along with the precipitation of the activated sludge in the sedimentation tank.
The sludge age of the activated sludge is short, and the sludge is renewed by discharging the excess sludge through the sedimentation tank, so that the activity of the sludge in the tank is always maintained in the optimal state, and the activated sludge is ensured to have strong degradation capability on pollutants all the time.
At present, all large and small wastewater treatment plants are applied. After the wastewater is hydrolyzed, the biodegradability is good, so that the emission standard can be reached by adopting an activated sludge method to greatly degrade organic matters in the water. The aerobic mode adopts an oxidation ditch, the flow state of the wastewater in the tank is good, the treatment capacity is strong, the anaerobic treatment tank is suitable for both anoxic operation and aerobic operation, and the anaerobic treatment tank adopts the oxidation ditch mode, so that anoxic sections can be designed in partial areas in the tank when the subsequent water quality and operation need, and the diversity and flexibility of process treatment are improved.
In conclusion, the washing and degumming wastewater treatment system can meet the discharge requirement mainly by adopting a process of 'coagulating sedimentation, hydrolytic acidification and oxidation ditch', and the wastewater is recycled or discharged according to the requirement after being treated by the process.
Sludge treatment process
Sludge dewatering generally includes centrifugal dewatering, plate-and-frame filter presses, and belt dewaterers.
The centrifuge has large processing capacity, can realize continuous operation, and has simple and convenient operation and high automation degree; the defects of low solid recovery rate, high price, large noise, difficult maintenance in a factory and the like, high one-time investment and high operation cost.
The plate-frame filter pressing process has the advantages of simple structure, high solid recovery rate, lowest water content of mud cakes, high processing capacity, economic price, easy maintenance and the like; the defects of incapability of continuous work, relatively high labor intensity, poor environmental condition and the like.
The belt type dehydrator can continuously operate and automatically operate, but the water content of the sludge is 75-80%.
The silicon-containing sludge is difficult to dewater, and in order to increase the recovery value, the water content of the sludge cake is reduced as much as possible. So this scheme adopts high-pressure diaphragm pressure filter. A diaphragm filter press is a filter press with an elastic membrane additionally arranged between a filter plate and filter cloth. In the use process, when feeding is finished, high-pressure fluid or gas medium can be injected into the diaphragm plate, at the moment, the whole diaphragm can be bulged to press a filter cake, further the further dehydration of the filter cake is realized, and the squeezing filtration is generally known.
The degumming wastewater is collected by a collecting pipe network and then automatically flows to a degumming wastewater sedimentation tank for solid-liquid separation, and the supernatant automatically flows to a degumming wastewater clear water tank and is lifted to a degumming wastewater adjusting tank by a lift pump.
Specifically, the method comprises the following steps:
the degumming wastewater and the redundant slicing wastewater are fully mixed in a degumming wastewater adjusting tank, then are conveyed to a coagulation reaction tank through a lift pump, enter a coagulation sedimentation tank for solid-liquid separation after being subjected to pH adjustment and PAC and PAM full coagulation flocculation, remove most SS (suspended solid), the supernatant automatically flows to a dosing tank, is conveyed to a hydrolysis acidification tank through the lift pump after being added with alkali and nutrient salt and fully mixed, is subjected to hydrolysis acidification in the hydrolysis acidification tank, remove part of COD and improve the B/C ratio of the wastewater, the effluent of the hydrolysis acidification tank automatically flows to an aerobic tank for aerobic treatment to remove most COD, and the aerobic effluent is subjected to precipitation and then reaches the standard for discharge.
Sludge treatment system
Sludge is mainly classified into two categories: silicon-containing sludge mainly containing silicon powder and biochemical sludge generated by a biochemical treatment system after the wastewater is subjected to filter pressing by a high-pressure diaphragm plate frame.
The coagulating sedimentation sludge of the cleaning and degumming wastewater treatment system is silicon-containing sludge mainly containing silicon powder, and can be directly subjected to plate-and-frame filter pressing, and the sludge after filter pressing can be recycled or sold for sale. And (3) collecting sludge in the hydrolysis acidification tank and the aerobic sedimentation tank, then feeding the collected sludge into a biochemical sludge storage tank, adding a flocculating agent to modify the sludge before filter pressing, and pumping the modified sludge into a high-pressure diaphragm plate-and-frame filter press through a lifting pump to perform sludge dewatering. And (4) collecting the dewatered sludge by using a ton bag and then carrying out outward treatment, and separately collecting the filter pressing liquid and discharging the filter pressing liquid into a degumming wastewater regulating tank.
Medicine adding system
PAC (polyaluminium chloride) and PAM (polyacrylamide) mainly used for coagulation are used as the medicament; nutrient salts required by biochemical systems; CPAM (cationic polyacrylamide) for hardening and tempering of the sludge storage tank; liquid alkali for adjusting pH, a small amount of acid and the like.
In practice, the invention is designed according to the water volume of 8000m3/d considering the long term of the collection and physical and chemical treatment parts, and the water volume of 4000m3/d of the biochemical treatment part.
The following table shows the removal rate of COD and SS in the sewage by the process.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (7)
1. A method for treating cleaning degumming wastewater and redundant slicing wastewater is characterized by comprising the following steps:
s1: carrying out solid-liquid separation on the degumming wastewater and transferring the supernatant to a regulating tank to obtain pretreated degumming wastewater;
s2: mixing the slice wastewater with the pretreated degumming wastewater in the regulating tank, transferring the mixture to a coagulation reaction tank, then carrying out pH regulation, adding a coagulant, fully coagulating, and carrying out solid-liquid separation again;
s3: transferring the supernatant separated in the step S2 to a hydrolysis acidification tank, performing hydrolysis acidification, and then transferring the wastewater subjected to hydrolysis acidification to an aerobic tank for aerobic treatment;
s4: precipitating the wastewater after the aerobic treatment to obtain drainable wastewater.
2. The method for treating the washing degumming wastewater and the excessive slicing wastewater according to claim 1, wherein the hydrolysis acidification in the S3 adopts a hydrolysis acidification tank without filler to degrade refractory organic matters in the wastewater.
3. The method for treating the washing degumming wastewater and the excessive slicing wastewater according to the claim 1 or 2, characterized in that the hydrolysis acidification tank in the S3 adopts an up-flow type, silicon powder is further precipitated by flocculation of activated sludge, and part of the silicon-containing sludge is periodically discharged after the activated sludge is adsorbed by internal circulation.
4. The method for treating the washing degumming waste water and the excessive slicing waste water according to claim 1, wherein the aerobic treatment in S3 is in the form of an oxidation ditch.
5. The method for treating the washing degumming wastewater and the excessive slicing wastewater according to claim 1, wherein the siliceous sludge generated by the solid-liquid separation in S1 and S2 is subjected to a pressing filtration treatment, and the pressing filtrate is discharged into a degumming wastewater adjusting tank.
6. The method for treating the washing degumming wastewater and the excessive slicing wastewater according to claim 1, wherein the biochemical sludge precipitated in S4 is transferred to a biochemical sludge storage tank, then a flocculating agent is added to condition the sludge and the sludge is pressed and filtered to dewater the sludge, and the press filtrate is discharged into a degumming wastewater adjusting tank.
7. The method for treating washing degumming wastewater and excessive slicing wastewater according to claim 6, wherein pH adjustment in S2 uses liquid alkali or acid, and coagulant uses polyaluminium chloride and polyacrylamide.
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| CN202310112368.6A CN115872572A (en) | 2023-02-14 | 2023-02-14 | Method for treating cleaning degumming wastewater and redundant slicing wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117756326A (en) * | 2023-12-25 | 2024-03-26 | 江阴东为资源再生技术有限公司 | Automatic control system and method for silicon wafer degumming wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117756326A (en) * | 2023-12-25 | 2024-03-26 | 江阴东为资源再生技术有限公司 | Automatic control system and method for silicon wafer degumming wastewater |
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