CN115159780A - Green and efficient large-size ultrathin monocrystalline silicon wafer wastewater treatment method - Google Patents
Green and efficient large-size ultrathin monocrystalline silicon wafer wastewater treatment method Download PDFInfo
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- 229910021421 monocrystalline silicon Inorganic materials 0.000 title claims abstract description 21
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 20
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- 239000002351 wastewater Substances 0.000 claims abstract description 76
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
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- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 claims description 6
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C02F3/30—Aerobic and anaerobic processes
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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
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Abstract
The invention discloses a green and efficient large-size ultrathin monocrystalline silicon piece wastewater treatment method which comprises the specific steps of sequentially enabling wastewater to enter a cleaning and degumming wastewater adjusting tank, a coagulating sedimentation tank, a first combined air flotation tank, a hydrolysis acidification sedimentation tank, an aerobic sedimentation tank and a second combined air flotation tank, then discharging the wastewater after reaching standards, sequentially enabling the treated sludge to enter a filter press after sequentially passing through a sludge conditioning tank and a sludge concentration tank, and carrying out sludge outward transportation regularly after pressing. The invention has the advantages of ensuring that various effluent quality indexes discharged after sewage treatment meet the requirements of discharge standards and recycled water quality required by construction units, along with simple process flow, reasonable equipment arrangement, compact structure, small occupied area, investment and operation cost saving, convenient operation and management, simple technical requirements and realization of automatic control to the maximum extent.
Description
Technical Field
The invention relates to the technical field of photovoltaic manufacturing, in particular to a green and efficient large-size ultrathin monocrystalline silicon piece wastewater treatment method.
Background
At present, main pollutants of large-size ultrathin monocrystalline silicon wafer production wastewater are SS and COD, an existing wastewater treatment system is relatively complex and inconvenient to manage, some technologies cannot be applied by domestic enterprises on a large scale, cost is high, investment and operation cost are high, the technologies cannot be born by small and medium-sized enterprises, the effluent water quality index after wastewater treatment cannot meet the reuse water quality requirements of emission standards and requirements of construction units, and treated sludge can also become pollutants and is not environment-friendly.
Disclosure of Invention
The invention aims to solve the problems of low treatment efficiency, no environmental protection, poor effect and high cost of the existing large-size ultrathin monocrystalline silicon piece wastewater, provides a green and efficient large-size ultrathin monocrystalline silicon piece wastewater treatment method, ensures that various effluent water quality indexes discharged after sewage treatment all meet the reuse water quality requirements of the discharge standard and the requirements of construction units, and has the advantages of simple and direct process flow, reasonable equipment arrangement, compact structure, small occupied area, low investment and operation cost, convenient operation and management, simple technical requirements and realization of automatic control to the maximum extent.
In order to achieve the purpose, the invention adopts the following technical scheme:
a green and efficient large-size ultrathin monocrystalline silicon piece wastewater treatment method specifically comprises the following steps:
(1) The comprehensive wastewater in the workshop flows into a cleaning and degumming wastewater adjusting tank, and an aeration stirring system is arranged at the bottom of the tank to prevent solid matters in the wastewater from precipitating, uniformly mix the wastewater and adjust the water quality and the water quantity of the wastewater;
(2) Conveying the effluent of the washing and degumming wastewater adjusting tank into a coagulation reaction tank of a coagulation and precipitation combined tank by a lifting pump, wherein a mechanical stirrer and a pH meter which are linked with the lifting pump are arranged in the coagulation reaction tank, the pH meter controls a metering pump to quantitatively feed NaOH and PAC agents, so that the wastewater is reacted and coagulated to form fine particle precipitates, the mechanical stirrer is used for fully mixing the wastewater and the agents by stirring, and the wastewater after reaction flows into the precipitation tank by gravity;
(3) Supernatant in the coagulation sedimentation combined tank automatically flows to a first combined air floatation tank, PAC and PAM are added for air floatation, a stirrer of an air floatation machine rotates to promote reaction, flocculent impurities are combined with bubbles in a water inlet source in the first air floatation tank under the action of small bubbles or micro bubbles generated by an aerator, the flocculent impurities rise to the surface of sewage, the sewage is pushed to a first scum collecting tank under the action of a first scum scraping machine, and scum is pumped to a sludge conditioning tank and a sludge concentration tank for treatment;
(4) The sewage after the air floatation treatment enters a hydrolysis acidification tank through a lifting pump, a nutritional agent is added into the tank, the biodegradability of the wastewater is improved, macromolecular organic matters are converted into micromolecules, and COD in the wastewater is removed;
(5) The wastewater after the reaction in the hydrolysis acidification tank enters a hydrolysis acidification sedimentation tank, the lower part of the tank body is provided with a mud scraper which is linked with a lifting pump, the settled sludge is collected at the bottom of the tank body and is slowly disturbed so that the sludge cannot be hardened, and the sludge at the bottom of the tank body is periodically conveyed to a sludge conditioning tank and a sludge concentration tank by a sludge pump controlled by set time;
(6) The supernatant of the hydrolytic acidification sedimentation tank automatically overflows into an aerobic tank by gravity, a defoaming agent and a nutrient are added into the aerobic tank to further remove COD in water, and the treated wastewater flows into the aerobic sedimentation tank;
(7) A sludge scraper linked with a lifting pump is also arranged at the lower part of the aerobic sedimentation tank, the settled sludge is collected at the bottom of the tank body and is disturbed slowly so that the sludge cannot be hardened, and the sludge at the bottom of the tank body is conveyed to a sludge conditioning tank and a sludge concentration tank at regular time by a sludge pump controlled by set time;
(8) Supernatant of the aerobic sedimentation tank automatically overflows through gravity and enters the second combined air floatation tank, the supernatant is subjected to air floatation after PAC and PAM are added, the reaction is carried out by rotating an air floatation machine stirrer, flocculent impurities are combined with bubbles in a water inlet source in the second air floatation tank under the action of small bubbles or micro bubbles generated by an aerator, the flocculent impurities rise to the surface of sewage and are pushed to a second scum collecting tank under the action of a second scum scraping machine, scum is pumped to a sludge conditioning tank and a sludge concentration tank for treatment, and finally treated discharged water reaches the standard and is discharged.
Further, in the step (1), a liquid level meter is arranged in the cleaning and degumming wastewater adjusting tank, and the liquid level of the adjusting tank is continuously monitored.
Further, in the step (2), a mechanical stirrer linked with a lift pump is also arranged in a coagulation tank of the coagulation-sedimentation combined tank to stir and mix the wastewater and the medicament, a PAM polymer coagulant aid is quantitatively added into the tank through a metering pump to enable the coagulants to be adsorbed and linked into larger alum flocs, and the coagulated wastewater flows into the sedimentation tank.
Further, in the step (4), the reaction process in the hydrolysis acidification tank is controlled by two stages of hydrolysis and acidification, in the hydrolysis stage, the composite filler can degrade solid organic matters into soluble matters and macromolecular organic matters into small molecular matters, and in the acid production stage, carbohydrates and other organic compounds are degraded into organic acids, mainly acetic acid, butyric acid and propionic acid.
Further, the sludge in the sludge concentration tank is conveyed into a filter press through a sludge pump, the pressed sludge falls onto a belt conveyor and is conveyed into a sludge storage hopper through the belt conveyor, the sludge is conveyed out by connecting with an automobile at regular time, and the filtrate flows back to the filtrate tank in a gravity mode to be mixed and then is treated.
Further, the filter press adopts a high-pressure diaphragm filter press.
Further, in the step (2), naOH is liquid 30% NaOH for adjusting pH of the water.
Further, in the steps (2), (3) and (8), the PAC agent is liquid 10% PAC, the concentration of the added PAC is about 100ppm, and the amount of the added PAC is =100ppm multiplied by the amount of the waste water multiplied by the density of the waste water.
Further, in the steps (3) and (8), solid PAM is added into a PAM dissolving tank, and the PAM and water are rapidly dissolved by stirring of a stirrer, wherein the preparation concentration is 0.1%.
In the technical scheme of the invention, micro suspended particles with specific gravity close to water are effectively removed by an air floatation method, and the biodegradability of wastewater is improved by hydrolytic acidification, so that the pH value of the wastewater is reduced, the sludge yield is reduced, favorable conditions are created for subsequent aerobic biological treatment, the removal effect of the whole system on organic matters and suspended matters is improved, the organic load of an aerobic system is reduced, and the energy consumption of the whole system is greatly reduced compared with that of the aerobic system which is used independently by the hydrolytic acidification and contact oxidation; in addition, the filter cake is squeezed by adopting a diaphragm squeezing technology, so that the dehydration efficiency of the filter press is obviously improved, and the effects of energy conservation and emission reduction are obvious.
Drawings
FIG. 1 is a flow chart of the green and efficient large-size ultrathin monocrystalline silicon wafer wastewater treatment method.
Detailed Description
Example 1
In order to make the present invention more clear, the following will further illustrate a green and efficient method for treating wastewater from large-sized ultra-thin monocrystalline silicon wafers according to the present invention with reference to the accompanying drawings, and the specific examples described herein are only for explaining the present invention and are not intended to limit the present invention.
Referring to fig. 1, a green and efficient method for treating large-size ultrathin monocrystalline silicon wafer wastewater comprises the following specific steps:
(1) The comprehensive workshop wastewater flows into a cleaning and degumming wastewater adjusting tank, an aeration stirring system is arranged at the bottom of the tank to prevent solid matters in the wastewater from precipitating, uniformly mix the wastewater and adjust the water quality and the water quantity of the wastewater, and a liquid level meter is also arranged in the tank to continuously monitor the liquid level of the adjusting tank;
(2) Conveying the effluent of the washing and degumming wastewater adjusting tank into a coagulation reaction tank of a coagulation and precipitation combined tank by a lifting pump, wherein a mechanical stirrer and a pH meter which are linked with the lifting pump are arranged in the coagulation reaction tank, the pH meter controls a metering pump to quantitatively feed NaOH and PAC agents, so that the wastewater is reacted and coagulated to form fine particle precipitates, the mechanical stirrer is used for fully mixing the wastewater and the agents by stirring, and the wastewater after reaction flows into the precipitation tank by gravity;
a mechanical stirrer linked with a lift pump is also arranged in a coagulation tank of the coagulation and sedimentation combined tank and is used for stirring and mixing the wastewater and the medicament, PAM high-molecular coagulant aid is quantitatively added into the tank through a metering pump, so that aggregates are adsorbed and linked into larger alum flocs, and the coagulated wastewater flows into a sedimentation tank;
(3) Supernatant in the coagulation sedimentation combined tank automatically flows to a first combined air floatation tank, PAC and PAM are added for air floatation, a stirrer of an air floatation machine rotates to promote reaction, flocculent impurities are combined with bubbles in a water inlet source in the first air floatation tank under the action of small bubbles or micro bubbles generated by an aerator, the flocculent impurities rise to the surface of sewage, the sewage is pushed to a first scum collecting tank under the action of a first scum scraping machine, and scum is pumped to a sludge conditioning tank and a sludge concentration tank for treatment;
(4) Sewage after air floatation treatment enters a hydrolysis acidification tank through a lifting pump, a nutrient is added into the tank to improve the biodegradability of the wastewater, macromolecular organic matters are converted into micromolecules, COD (chemical oxygen demand) in the wastewater is removed, the reaction process in the hydrolysis acidification tank is controlled by two stages of hydrolysis and acidification, in the hydrolysis stage, solid organic matters can be degraded into soluble matters by a composite filler, the macromolecular organic matters are degraded into micromolecular substances, and in the acid production stage, carbohydrates and other organic compounds are degraded into organic acids which are mainly acetic acid, butyric acid and propionic acid;
(5) The wastewater after the reaction in the hydrolysis acidification tank enters a hydrolysis acidification sedimentation tank, the lower part of the tank body is provided with a mud scraper which is linked with a lifting pump, the settled sludge is collected at the bottom of the tank body and is slowly disturbed so that the sludge cannot be hardened, and the sludge at the bottom of the tank body is periodically conveyed to a sludge conditioning tank and a sludge concentration tank by a sludge pump controlled by set time;
(6) The supernatant of the hydrolysis acidification sedimentation tank overflows into an aerobic tank through gravity flow, a defoaming agent and a nutrient are added into the aerobic tank, COD in water is further removed, and the treated wastewater flows into the aerobic sedimentation tank;
(7) A sludge scraper linked with a lifting pump is also arranged at the lower part of the aerobic sedimentation tank, the settled sludge is collected at the bottom of the tank body and is slowly disturbed so that the sludge cannot be hardened, and the sludge at the bottom of the tank body is regularly conveyed into a sludge conditioning tank and a sludge concentration tank by a sludge pump controlled by set time;
(8) Supernatant of the aerobic sedimentation tank automatically overflows through gravity and enters the second combined air floatation tank, the supernatant is subjected to air floatation after PAC and PAM are added, the reaction is carried out by rotating an air floatation machine stirrer, flocculent impurities are combined with bubbles in a water inlet source in the second air floatation tank under the action of small bubbles or micro bubbles generated by an aerator, the flocculent impurities rise to the surface of sewage and are pushed to a second scum collecting tank under the action of a second scum scraping machine, scum is pumped to a sludge conditioning tank and a sludge concentration tank for treatment, and finally treated discharged water reaches the standard and is discharged.
In the reaction, sludge and scum are pumped to a sludge conditioning tank, then enter a sludge concentration tank and are conveyed to a filter press through a sludge pump, the filter press adopts a high-pressure diaphragm filter press, the pressed sludge falls onto a belt conveyor and is conveyed to a sludge storage hopper through the belt conveyor, the sludge is transported out by connecting with an automobile at regular time, and the filtrate flows back to a filtrate tank in a gravity mode to be mixed and then is treated.
In the above reaction, naOH was used in a liquid state 30% NaOH for adjusting the pH of the water.
In the above reaction, the PAC agent is liquid 10% PAC, and the concentration of PAC added is about 100ppm, the amount of PAC =100ppm x amount of wastewater x density of wastewater.
In the reaction, solid PAM is added into a PAM dissolving tank, and simultaneously stirred by a stirrer to quickly dissolve PAM and water, wherein the preparation concentration is 0.1%.
After wastewater treatment by the method of the invention, COD and SS indexes of inlet and outlet water of each treatment project are shown in the following table:
the amount of waste water generated by the green and efficient large-size ultrathin monocrystalline silicon piece matched waste water station is 4000m recently 3 In view of the fact that the amount of the drug used is as follows：
1) The amount of NaOH used is as follows: according to the wastewater quality reference data, naOH is only used for adjusting the PH value, and the cost is not temporarily counted;
2) PAC dosage: according to the experience of similar wastewater, the concentration of PAC added in the wastewater is about 100ppm, and the consumption of PAC medicament in the wastewater is estimated to be =100ppm multiplied by the water quantity of the wastewater multiplied by the density of the wastewater =100 multiplied by 10 -3 ×4000×1.12=448kg/d；
3) Dosage of PAM: the concentration of PAM configured in a wastewater station is 0.1%, the volume concentration of PAM added in wastewater is 0.3%, and the PAM dosage = wastewater quantity multiplied by the added volume ratio multiplied by wastewater density multiplied by the configured concentration multiplied by the residual quantity =4000 multiplied by 0.3% multiplied by 1 multiplied by 0.1% multiplied by 1.2 multiplied by 1000=14.4kg/d.
As can be seen from the table, after the wastewater treatment is carried out by using the method disclosed by the invention, the COD content is less than 150mg/L, the total removal rate is 93.6%, the SS content is less than 140mg/L, and the total removal rate is 92.5%, so that the COD content and the SS content of the treated wastewater are greatly reduced, and the treated wastewater can reach the discharge standard.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the present invention.
Claims (9)
1. A green and efficient large-size ultrathin monocrystalline silicon piece wastewater treatment method is characterized by comprising the following specific steps:
(1) The comprehensive wastewater of the workshop flows into a cleaning and degumming wastewater adjusting tank, and an aeration stirring system is arranged at the bottom of the tank to prevent solid matters in the wastewater from precipitating, uniformly mix the wastewater and adjust the water quality and the water quantity of the wastewater;
(2) Conveying the effluent of the washing and degumming wastewater adjusting tank into a coagulation reaction tank of a coagulation and precipitation combined tank by a lifting pump, wherein a mechanical stirrer and a pH meter which are linked with the lifting pump are arranged in the coagulation reaction tank, the pH meter controls a metering pump to quantitatively feed NaOH and PAC agents, so that the wastewater is reacted and coagulated to form fine particle precipitates, the mechanical stirrer is used for fully mixing the wastewater and the agents by stirring, and the wastewater after reaction flows into the precipitation tank by gravity;
(3) Supernatant in the coagulation sedimentation combined tank automatically flows to a first combined air floatation tank, PAC and PAM are added for air floatation, a stirrer of an air floatation machine rotates to promote reaction, flocculent impurities are combined with bubbles in a water inlet source in the first air floatation tank under the action of small bubbles or micro bubbles generated by an aerator, the flocculent impurities rise to the surface of sewage, the sewage is pushed to a first scum collecting tank under the action of a first scum scraping machine, and scum is pumped to a sludge conditioning tank and a sludge concentration tank for treatment;
(4) The sewage after the air floatation treatment enters a hydrolysis acidification tank through a lifting pump, a nutritional agent is added into the tank, the biodegradability of the wastewater is improved, macromolecular organic matters are converted into micromolecules, and COD in the wastewater is removed;
(5) The wastewater after the reaction in the hydrolysis acidification tank enters a hydrolysis acidification sedimentation tank, the lower part of the tank body is provided with a mud scraper which is linked with a lifting pump, the settled sludge is collected at the bottom of the tank body and is slowly disturbed so that the sludge cannot be hardened, and the sludge at the bottom of the tank body is periodically conveyed to a sludge conditioning tank and a sludge concentration tank by a sludge pump controlled by set time;
(6) The supernatant of the hydrolysis acidification sedimentation tank overflows into an aerobic tank through gravity flow, a defoaming agent and a nutrient are added into the aerobic tank, COD in water is further removed, and the treated wastewater flows into the aerobic sedimentation tank;
(7) A sludge scraper linked with a lifting pump is also arranged at the lower part of the aerobic sedimentation tank, the settled sludge is collected at the bottom of the tank body and is disturbed slowly so that the sludge cannot be hardened, and the sludge at the bottom of the tank body is conveyed to a sludge conditioning tank and a sludge concentration tank at regular time by a sludge pump controlled by set time;
(8) Supernatant of the aerobic sedimentation tank automatically overflows through gravity and enters the second combined air floatation tank, the supernatant is subjected to air floatation after PAC and PAM are added, the reaction is carried out by rotating an air floatation machine stirrer, flocculent impurities are combined with bubbles in a water inlet source in the second air floatation tank under the action of small bubbles or micro bubbles generated by an aerator, the flocculent impurities rise to the surface of sewage and are pushed to a second scum collecting tank under the action of a second scum scraping machine, scum is pumped to a sludge conditioning tank and a sludge concentration tank for treatment, and finally treated discharged water reaches the standard and is discharged.
2. The green and efficient wastewater treatment method for large-size ultrathin monocrystalline silicon wafers as claimed in claim 1, characterized in that:
in the step (1), a liquid level meter is arranged in the cleaning and degumming wastewater adjusting tank, and the liquid level of the adjusting tank is continuously monitored.
3. The green and efficient large-size ultra-thin monocrystalline silicon wafer wastewater treatment method according to claim 1 or 2, characterized in that:
in the step (2), a mechanical stirrer linked with a lift pump is also arranged in a coagulation tank of the coagulation and precipitation combined tank for stirring and mixing the wastewater and the medicament, a PAM (polyacrylamide) high-molecular coagulant aid is quantitatively added into the tank through a metering pump, so that the coagulants are adsorbed and linked into larger alum flocs, and the coagulated wastewater flows into the precipitation tank.
4. The green and efficient wastewater treatment method for large-size ultrathin monocrystalline silicon wafers as claimed in claim 1 or 2, characterized in that:
in the step (4), the reaction process in the hydrolysis acidification tank is controlled by two stages of hydrolysis and acidification, in the hydrolysis stage, the composite filler can degrade solid organic matters into soluble substances and macromolecular organic matters into small molecular substances, and in the acid production stage, carbohydrates and other organic compounds are degraded into organic acids mainly comprising acetic acid, butyric acid and propionic acid.
5. The green and efficient large-size ultra-thin monocrystalline silicon wafer wastewater treatment method according to claim 1 or 2, characterized in that:
the sludge in the sludge concentration tank is conveyed into a filter press through a sludge pump, the pressed sludge falls onto a belt conveyor and is conveyed into a sludge storage hopper through the belt conveyor, the sludge is transported out by contacting an automobile at regular time, and the filtrate flows back to a filtrate tank in a gravity mode to be mixed and then is treated.
6. The green and efficient large-size ultra-thin monocrystalline silicon wafer wastewater treatment method according to claim 5, characterized in that:
the filter press adopts a high-pressure diaphragm filter press.
7. The green and efficient wastewater treatment method for large-size ultrathin monocrystalline silicon wafers as claimed in claim 1 or 2, characterized in that:
in said step (2), naOH is used in a liquid state 30% NaOH for adjusting the pH of the water.
8. The green and efficient large-size ultra-thin monocrystalline silicon wafer wastewater treatment method according to claim 1 or 2, characterized in that:
in said steps (2), (3) and (8), the PAC reagent is liquid 10% PAC, the PAC concentration added is about 100ppm, the PAC usage =100ppm × amount of wastewater × density of wastewater.
9. The green and efficient wastewater treatment method for large-size ultrathin monocrystalline silicon wafers as claimed in claim 1 or 2, characterized in that:
in the steps (3) and (8), solid PAM is added into a PAM dissolving tank, and the PAM and water are quickly dissolved by stirring of a stirrer, wherein the preparation concentration is 0.1%.
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