CN115159780B - Green and efficient large-size ultrathin monocrystalline silicon piece wastewater treatment method - Google Patents
Green and efficient large-size ultrathin monocrystalline silicon piece wastewater treatment method Download PDFInfo
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- CN115159780B CN115159780B CN202210860196.6A CN202210860196A CN115159780B CN 115159780 B CN115159780 B CN 115159780B CN 202210860196 A CN202210860196 A CN 202210860196A CN 115159780 B CN115159780 B CN 115159780B
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- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 20
- 229910021421 monocrystalline silicon Inorganic materials 0.000 title claims abstract description 19
- 239000010802 sludge Substances 0.000 claims abstract description 77
- 239000002351 wastewater Substances 0.000 claims abstract description 63
- 238000004062 sedimentation Methods 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 230000007062 hydrolysis Effects 0.000 claims abstract description 22
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 22
- 239000010865 sewage Substances 0.000 claims abstract description 22
- 230000020477 pH reduction Effects 0.000 claims abstract description 21
- 230000001105 regulatory effect Effects 0.000 claims abstract description 16
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 230000001112 coagulating effect Effects 0.000 claims abstract description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 25
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 230000015271 coagulation Effects 0.000 claims description 17
- 238000005345 coagulation Methods 0.000 claims description 17
- 230000003750 conditioning effect Effects 0.000 claims description 13
- 239000012535 impurity Substances 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 12
- 230000005484 gravity Effects 0.000 claims description 10
- 239000006228 supernatant Substances 0.000 claims description 10
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 claims description 6
- 238000005276 aerator Methods 0.000 claims description 6
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 claims description 6
- 239000003814 drug Substances 0.000 claims description 6
- 238000007790 scraping Methods 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 239000000706 filtrate Substances 0.000 claims description 4
- 235000016709 nutrition Nutrition 0.000 claims description 4
- 238000005273 aeration Methods 0.000 claims description 3
- 229940037003 alum Drugs 0.000 claims description 3
- 235000014633 carbohydrates Nutrition 0.000 claims description 3
- 150000001720 carbohydrates Chemical class 0.000 claims description 3
- 239000000701 coagulant Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 239000013530 defoamer Substances 0.000 claims description 3
- 238000004090 dissolution Methods 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 239000010419 fine particle Substances 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 150000007524 organic acids Chemical class 0.000 claims description 3
- 235000005985 organic acids Nutrition 0.000 claims description 3
- 150000002894 organic compounds Chemical class 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 239000002244 precipitate Substances 0.000 claims description 3
- 230000001376 precipitating effect Effects 0.000 claims description 3
- 235000019260 propionic acid Nutrition 0.000 claims description 3
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 claims description 3
- 150000003384 small molecules Chemical class 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 235000015097 nutrients Nutrition 0.000 claims description 2
- 230000002053 acidogenic effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000003301 hydrolyzing effect Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- 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
-
- 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
-
- 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
-
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
-
- 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
- Y02W10/10—Biological treatment of water, waste water, or sewage
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The invention discloses a green and efficient large-size ultrathin monocrystalline silicon piece wastewater treatment method, which comprises the specific steps of sequentially feeding wastewater into a cleaning degumming wastewater regulating tank, a coagulating sedimentation tank, a first combined air floatation tank, a hydrolysis acidification sedimentation tank, an aerobic sedimentation tank and a second combined air floatation tank, discharging the wastewater after reaching standards, sequentially feeding treated sludge into a filter press after sequentially passing through a sludge regulating tank and a sludge concentrating tank, and periodically carrying out sludge outward transportation after pressing. The invention has the advantages of ensuring that all effluent quality indexes discharged after sewage treatment meet the requirements of emission standards and recycling water quality required by construction units, along with simple process flow, reasonable equipment arrangement, compact structure, small occupied area, investment and running cost, convenient operation and management, simple technical requirement and realization of automatic control to the greatest 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 wafer 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 complex and inconvenient to manage, some technologies cannot be applied on a large scale by domestic enterprises, the cost is high, the investment and the operation cost are high, the wastewater cannot be born by small and medium enterprises, meanwhile, effluent water quality indexes after wastewater treatment can not meet the emission standard and the recycling water quality requirement required by construction units at all times, and the treated sludge also becomes pollutants and is not environment-friendly.
Disclosure of Invention
The invention aims to solve the problems of low efficiency, environmental protection, poor effect and high cost of the existing large-size ultrathin monocrystalline silicon wafer wastewater treatment, and provides a green and efficient large-size ultrathin monocrystalline silicon wafer wastewater treatment method, which ensures that all effluent quality indexes discharged after sewage treatment meet the recycling water quality requirements of discharge standards and construction unit requirements, and has the advantages of simple process flow, reasonable equipment arrangement, compact structure, small occupied area, investment and running cost saving, convenient operation management, simple technical requirements and maximum realization of automatic control.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the green and efficient large-size ultrathin monocrystalline silicon piece wastewater treatment method comprises the following specific steps:
(1) The comprehensive wastewater in the workshop flows into a cleaning and degumming wastewater regulating tank, an aeration stirring system is arranged at the bottom of the tank, solid matters in the wastewater are prevented from precipitating, the wastewater is uniformly mixed, and the water quality and the water quantity of the wastewater are regulated;
(2) The effluent of the washing and degumming wastewater regulating tank is conveyed into a coagulation reaction tank of a coagulation sedimentation combined tank by a lifting pump, a mechanical stirrer and a pH meter which are linked with the lifting pump are arranged in the coagulation reaction tank, and the pH meter controls a metering pump to quantitatively add NaOH and PAC medicaments so as to enable the wastewater to react and agglomerate to form fine particle precipitates;
(3) The supernatant of the coagulating sedimentation combined tank automatically flows to a first combined air floatation tank, PAC and PAM are added, air floatation is carried out, the reaction is promoted by the rotation of an air floatation machine stirrer, a water inlet source combines flocculent impurities with bubbles under the action of small bubbles or micro bubbles generated by an aerator in the first air floatation tank, the flocculent impurities are lifted to the surface of sewage, and then the sewage is pushed to a first scum collecting tank by the action of a first scum scraping machine, and scum is pumped to a sludge conditioning tank and a sludge concentrating tank for treatment;
(4) The sewage after the air floatation treatment enters a hydrolysis acidification tank through a lift pump, a nutrient is added into the tank, the biodegradability of the sewage is improved, macromolecular organic matters are converted into small molecules, and COD in the sewage is removed;
(5) The wastewater after the reaction in the hydrolysis acidification tank enters a hydrolysis acidification sedimentation tank, a sludge scraper which is linked with a lifting pump is arranged at the lower part of the tank body, the precipitated sludge is collected at the bottom of the tank body and slowly disturbed to prevent the sludge from hardening, and the sludge at the bottom of the tank is conveyed to a sludge conditioning tank and a sludge concentration tank at fixed time by a sludge pump controlled by set time;
(6) The supernatant fluid of the hydrolysis acidification sedimentation tank automatically overflows into an aerobic tank through gravity, defoamer and nutritional agent 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 which is linked with a lifting pump is also arranged at the lower part of the tank body of the aerobic sedimentation tank, the settled sludge is collected at the bottom of the tank body and is slowly disturbed to prevent the sludge from being hardened, and the sludge at the bottom of the tank is conveyed to a sludge conditioning tank and a sludge concentration tank at fixed time by a sludge pump controlled by set time;
(8) The supernatant of the aerobic sedimentation tank enters a second combined air floatation tank through gravity self-flowing overflow, air floatation is carried out after PAC and PAM are added again, the mixture is reacted through rotation of an air floatation machine stirrer, a water inlet source combines flocculent impurities with bubbles under the action of small bubbles or micro bubbles generated by an aerator in the second air floatation tank, the flocculent impurities are lifted to the surface of sewage, the sewage is 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 concentrating tank for treatment, and finally the 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 regulating tank, and the liquid level of the regulating tank is continuously monitored.
Further, in the step (2), a mechanical stirrer linked with a lifting pump is also arranged in the coagulation tank of the coagulating sedimentation combined tank and is used for stirring and mixing the wastewater and the medicament, and PAM high polymer coagulant aid is quantitatively added into the tank through a metering pump, so that the coagulation bodies are adsorbed and combined into larger alum flowers, 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, macromolecular organic matters into micromolecular 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, is conveyed into a sludge storage hopper through the belt conveyor, is conveyed out by a timing contact vehicle, and is returned to a filtrate tank in a gravity mode for mixing and then is treated.
Further, the filter press adopts a high-pressure membrane filter press.
Further, in the step (2), naOH adopts liquid 30% NaOH for adjusting the pH value of water.
Further, in the steps (2), (3) and (8), PAC is 10% PAC in liquid form, the PAC concentration is about 100ppm, and PAC usage=100 ppm×wastewater amount×wastewater density.
Further, in the steps (3) and (8), the PAM is configured by adding solid PAM into a PAM dissolution tank, and simultaneously stirring the PAM and water by a stirrer to dissolve the PAM rapidly, wherein the concentration of the PAM is 0.1%.
In the technical scheme of the invention, tiny suspended particles with specific gravity close to that of water are effectively removed through an air floatation method, and then the biodegradability of the wastewater is improved through 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 lightened, and the energy consumption of the hydrolytic acidification and contact oxidation whole system is greatly reduced compared with that of a single aerobic system; in addition, the filter cake is pressed by adopting the diaphragm pressing technology, so that the dehydration efficiency of the filter press is obviously improved, and the energy-saving and emission-reduction effects are obvious.
Drawings
FIG. 1 is a flow chart of a green and efficient large-size ultrathin monocrystalline silicon piece wastewater treatment method.
Detailed Description
Example 1
In order that the invention may be more clearly understood, a green and efficient large-size ultra-thin monocrystalline silicon wafer wastewater treatment method of the invention will be further described with reference to the accompanying drawings, wherein the specific embodiments described herein are for illustration only and not for limitation.
Referring to fig. 1, the method for treating the wastewater of the large-size ultrathin monocrystalline silicon wafer is green and efficient, and comprises the following specific steps:
(1) The comprehensive wastewater in the workshop flows into a cleaning and degumming wastewater regulating tank, an aeration stirring system is arranged at the bottom of the tank to prevent solid matters in the wastewater from precipitating, the wastewater is uniformly mixed, the water quality and the water quantity of the wastewater are regulated, a liquid level meter is also arranged in the tank, and the liquid level of the regulating tank is continuously monitored;
(2) The effluent of the washing and degumming wastewater regulating tank is conveyed into a coagulation reaction tank of a coagulation sedimentation combined tank by a lifting pump, a mechanical stirrer and a pH meter which are linked with the lifting pump are arranged in the coagulation reaction tank, and the pH meter controls a metering pump to quantitatively add NaOH and PAC medicaments so as to enable the wastewater to react and agglomerate to form fine particle precipitates;
a mechanical stirrer linked with a lifting pump is also arranged in a coagulation tank of the coagulation sedimentation combined tank and is used for stirring and mixing the wastewater and the medicament, PAM high polymer coagulant aid is quantitatively added into the tank through a metering pump, so that the coagulation body is adsorbed and combined into larger alum flowers, and the coagulated wastewater flows into a sedimentation tank;
(3) The supernatant of the coagulating sedimentation combined tank automatically flows to a first combined air floatation tank, PAC and PAM are added, air floatation is carried out, the reaction is promoted by the rotation of an air floatation machine stirrer, a water inlet source combines flocculent impurities with bubbles under the action of small bubbles or micro bubbles generated by an aerator in the first air floatation tank, the flocculent impurities are lifted to the surface of sewage, and then the sewage is pushed to a first scum collecting tank by the action of a first scum scraping machine, and scum is pumped to a sludge conditioning tank and a sludge concentrating tank for treatment;
(4) The sewage after the air floatation treatment enters a hydrolysis acidification tank through a lift pump, a nutritional agent is added in the tank, the biodegradability of the sewage is improved, macromolecular organic matters are converted into small molecules, COD (chemical oxygen demand) in the sewage is removed, the reaction process in the hydrolysis acidification tank is controlled in two stages of hydrolysis and acidification, in the hydrolysis stage, the composite filler can degrade solid organic matters into soluble substances, macromolecular organic matters are degraded into small molecular substances, and in the acid production stage, carbohydrates and other organic compounds are degraded into organic acids, 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, a sludge scraper which is linked with a lifting pump is arranged at the lower part of the tank body, the precipitated sludge is collected at the bottom of the tank body and slowly disturbed to prevent the sludge from hardening, and the sludge at the bottom of the tank is conveyed to a sludge conditioning tank and a sludge concentration tank at fixed time by a sludge pump controlled by set time;
(6) The supernatant fluid of the hydrolysis acidification sedimentation tank automatically overflows into an aerobic tank through gravity, defoamer and nutritional agent 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 which is linked with a lifting pump is also arranged at the lower part of the tank body of the aerobic sedimentation tank, the settled sludge is collected at the bottom of the tank body and is slowly disturbed to prevent the sludge from being hardened, and the sludge at the bottom of the tank is conveyed to a sludge conditioning tank and a sludge concentration tank at fixed time by a sludge pump controlled by set time;
(8) The supernatant of the aerobic sedimentation tank enters a second combined air floatation tank through gravity self-flowing overflow, air floatation is carried out after PAC and PAM are added again, the mixture is reacted through rotation of an air floatation machine stirrer, a water inlet source combines flocculent impurities with bubbles under the action of small bubbles or micro bubbles generated by an aerator in the second air floatation tank, the flocculent impurities are lifted to the surface of sewage, the sewage is 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 concentrating tank for treatment, and finally the treated discharged water reaches the standard and is discharged.
In the reaction, sludge scum is pumped to a sludge conditioning tank, then enters a sludge concentration tank and is conveyed into a filter press through a sludge pump, the filter press adopts a high-pressure diaphragm filter press, pressed sludge falls onto a belt conveyor, is conveyed into a sludge storage hopper through the belt conveyor, is conveyed to the outside by a timing contact automobile, and filtrate flows back to a filtrate tank in a gravity mode for mixing and then is treated.
In the reaction, naOH adopts liquid 30% NaOH for adjusting the pH value of water.
In the above reaction, PAC reagent was 10% PAC in liquid form, the PAC concentration was about 100ppm, PAC usage=100 ppm×wastewater amount×wastewater density.
In the above reaction, PAM was prepared by adding solid PAM to a PAM dissolution tank and stirring the PAM with water by a stirrer to dissolve the PAM rapidly, with a concentration of 0.1%.
After wastewater treatment is carried out by the method of the invention, COD and SS indexes of the inlet and outlet water of each treatment project are shown in the following table:
the invention is green and efficient, the large-size ultrathin monocrystalline silicon wafer is matched with a wastewater station, and the generated wastewater volume is 4000m according to the recent time 3 The amounts of the agents used are as follows:
1) NaOH dosage: according to the wastewater quality reference data, naOH is only used for adjusting the PH value, and the cost is not counted temporarily;
2) PAC usage: based on experience with similar wastewater, PAC concentrations dosed to such wastewater are approximately 100ppm, and PAC dosage in such wastewater is estimated to be = 100ppm x wastewater volume x wastewater density = 100 x 10 -3 ×4000×1.12=448kg/d；
3) PAM dosage: the concentration of PAM in the wastewater station was 0.1%, the volume concentration of PAM added to the wastewater was 0.3%, and PAM usage = wastewater volume x addition volume ratio x wastewater density x arrangement concentration x balance = 4000 x 0.3% x1 x 0.1% x1.2 x 1000 = 14.4kg/d.
As can be seen from the table, after the wastewater treatment is carried out by using the method, 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 and SS contents of the treated wastewater are greatly reduced, and the wastewater can be discharged up to the standard.
In addition to the embodiments described above, other embodiments of the invention are possible. All technical schemes formed by equivalent substitution or equivalent transformation fall within the protection scope of the invention.
Claims (7)
1. The green and efficient large-size ultrathin monocrystalline silicon piece wastewater treatment method specifically comprises the following steps of:
(1) The comprehensive wastewater in the workshop flows into a cleaning and degumming wastewater regulating tank, an aeration stirring system is arranged at the bottom of the tank, solid matters in the wastewater are prevented from precipitating, the wastewater is uniformly mixed, and the water quality and the water quantity of the wastewater are regulated;
(2) The effluent of the washing and degumming wastewater regulating tank is conveyed into a coagulation reaction tank of a coagulation sedimentation combined tank by a lifting pump, a mechanical stirrer and a pH meter which are linked with the lifting pump are arranged in the coagulation reaction tank, and the pH meter controls a metering pump to quantitatively add NaOH and PAC medicaments so as to enable the wastewater to react and agglomerate to form fine particle precipitates;
(3) The supernatant of the coagulating sedimentation combined tank automatically flows to a first combined air floatation tank, PAC and PAM are added, air floatation is carried out, the reaction is promoted by the rotation of an air floatation machine stirrer, a water inlet source combines flocculent impurities with bubbles under the action of small bubbles or micro bubbles generated by an aerator in the first combined air floatation tank, the flocculent impurities are lifted to the surface of sewage, and then 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 concentrating tank for treatment;
(4) The sewage after the air floatation treatment enters a hydrolysis acidification tank through a lift pump, a nutrient is added into the tank, the biodegradability of the sewage is improved, macromolecular organic matters are converted into small molecules, and COD in the sewage is removed;
(5) The wastewater after the reaction in the hydrolysis acidification tank enters a hydrolysis acidification sedimentation tank, a sludge scraper which is linked with a lifting pump is arranged at the lower part of the tank body, the precipitated sludge is collected at the bottom of the tank body and slowly disturbed to prevent the sludge from hardening, and the sludge at the bottom of the tank is conveyed to a sludge conditioning tank and a sludge concentration tank at fixed time by a sludge pump controlled by set time;
(6) The supernatant fluid of the hydrolysis acidification sedimentation tank automatically overflows into an aerobic tank through gravity, defoamer and nutritional agent 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 which is linked with a lifting pump is also arranged at the lower part of the tank body of the aerobic sedimentation tank, the settled sludge is collected at the bottom of the tank body and is slowly disturbed to prevent the sludge from being hardened, and the sludge at the bottom of the tank is conveyed to a sludge conditioning tank and a sludge concentration tank at fixed time by a sludge pump controlled by set time;
(8) The supernatant of the aerobic sedimentation tank automatically overflows by gravity and enters a second combined air floatation tank, the supernatant is subjected to air floatation after PAC and PAM are added again, the mixture is rotated by an air floatation machine stirrer to react, a water inlet source combines flocculent impurities with bubbles under the action of small bubbles or tiny bubbles generated by an aerator in the second air floatation tank, the flocculent impurities and the bubbles rise to the surface of sewage, the flocculent impurities 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 concentrating tank to be treated, sludge in the sludge concentrating tank is conveyed into a filter press by a sludge pump, the filter press adopts a high-pressure diaphragm filter press, pressed sludge falls onto a belt conveyor and is conveyed into a sludge storage hopper by the belt conveyor, the sludge is conveyed out by a timing contact car, the filtrate is mixed with water in a gravity mode and then treated, and finally the treated discharge reaches the standard to be discharged.
2. The green and efficient large-size ultrathin monocrystalline silicon piece wastewater treatment method according to claim 1, which is characterized by comprising the following steps:
in the step (1), a liquid level meter is arranged in the cleaning and degumming wastewater regulating tank, and the liquid level of the regulating tank is continuously monitored.
3. The green and efficient large-size ultrathin monocrystalline silicon piece wastewater treatment method according to claim 1 or 2, which is characterized by comprising the following steps:
in the step (2), a mechanical stirrer linked with a lifting pump is also arranged in a coagulation tank of the coagulation sedimentation combined tank and used for stirring and mixing wastewater and medicaments, and PAM high polymer coagulant aid is quantitatively added into the tank through a metering pump, so that the coagulation body is adsorbed and combined into larger alum flowers, and the coagulated wastewater flows into a sedimentation tank.
4. The green and efficient large-size ultrathin monocrystalline silicon piece wastewater treatment method according to claim 1 or 2, which is characterized by comprising the following steps:
in the step (4), the reaction process in the hydrolysis acidification tank is controlled in two stages of hydrolysis and acidification, in the hydrolysis stage, the composite filler degrades solid organic matters into soluble matters, degrades macromolecular organic matters into micromolecular matters, and in the acidogenic stage, carbohydrates and other organic compounds are degraded into organic acids, mainly acetic acid, butyric acid and propionic acid.
5. The green and efficient large-size ultrathin monocrystalline silicon piece wastewater treatment method according to claim 1 or 2, which is characterized by comprising the following steps:
in the step (2), naOH adopts liquid 30% NaOH for adjusting the PH value of water quality.
6. The green and efficient large-size ultrathin monocrystalline silicon piece wastewater treatment method according to claim 1 or 2, which is characterized by comprising the following steps:
in the steps (2), (3) and (8), PAC is 10% PAC in liquid form, the PAC concentration is 100ppm, PAC usage=100 ppm×wastewater amount×wastewater density.
7. The green and efficient large-size ultrathin monocrystalline silicon piece wastewater treatment method according to claim 1 or 2, which is characterized by comprising the following steps:
in the steps (3) and (8), the PAM is prepared by adding solid PAM into a PAM dissolution tank, and stirring the PAM and water by a stirrer to dissolve the PAM rapidly, wherein the concentration of the PAM is 0.1%.
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