CN115465970A - Production process for degrading zinc content in wastewater by comprehensively stirring lime and zinc-containing wastewater - Google Patents
Production process for degrading zinc content in wastewater by comprehensively stirring lime and zinc-containing wastewater Download PDFInfo
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- CN115465970A CN115465970A CN202211178628.1A CN202211178628A CN115465970A CN 115465970 A CN115465970 A CN 115465970A CN 202211178628 A CN202211178628 A CN 202211178628A CN 115465970 A CN115465970 A CN 115465970A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 81
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 62
- 239000011701 zinc Substances 0.000 title claims abstract description 62
- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 52
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 52
- 239000004571 lime Substances 0.000 title claims abstract description 52
- 238000003756 stirring Methods 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 230000000593 degrading effect Effects 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 104
- 238000005325 percolation Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 14
- 230000001105 regulatory effect Effects 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 230000002194 synthesizing effect Effects 0.000 claims abstract description 6
- 238000001556 precipitation Methods 0.000 claims abstract description 4
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 3
- 238000006243 chemical reaction Methods 0.000 claims description 30
- 229920002401 polyacrylamide Polymers 0.000 claims description 30
- 238000005189 flocculation Methods 0.000 claims description 23
- 230000016615 flocculation Effects 0.000 claims description 23
- 238000004062 sedimentation Methods 0.000 claims description 15
- 238000007667 floating Methods 0.000 claims description 11
- 239000002562 thickening agent Substances 0.000 claims description 11
- 238000010521 absorption reaction Methods 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 6
- 239000006228 supernatant Substances 0.000 claims description 4
- 239000010802 sludge Substances 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000010865 sewage Substances 0.000 description 6
- 239000012141 concentrate Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- JQJCSZOEVBFDKO-UHFFFAOYSA-N lead zinc Chemical compound [Zn].[Pb] JQJCSZOEVBFDKO-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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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
-
- 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
- C02F1/5281—Installations for water purification using chemical 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
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to a production process for degrading zinc content in wastewater by comprehensively stirring lime and zinc-containing wastewater, which comprises the following steps: s1, installing an interception dam and a seepage water tank in front of an adjusting tank, and installing a lime stirring barrel and a submersible pump on the seepage water tank in front of the adjusting tank; s2, adding 100 kg of lime into a lime stirring barrel, pumping the zinc-containing wastewater into the lime stirring barrel by using a submersible pump for stirring and synthesizing, wherein the concentration is about 60%, and performing cyclic preparation and adding; s3, stirring and integrating the wastewater and lime to obtain comprehensive solution with the concentration of 60%, putting the comprehensive solution into a percolation water tank, and then circularly adding the comprehensive solution to settle zinc in raw water into the percolation water tank; s4, adjusting the pH value of the underground wastewater in the percolation water tank to about 10 by comprehensive mixing liquid which is obtained by mixing the wastewater and lime and is integrated to 60% concentration; s5, putting the underground wastewater degraded to 3mg/L into a regulating tank for precipitation, and then performing dezincification treatment. The process reduces the content of zinc in the wastewater and ensures the standard discharge of the external drainage.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a production process for degrading the zinc content in wastewater by comprehensively stirring lime and zinc-containing wastewater.
Background
The Jiangxi Cuiyushan mining industry Co., ltd is a newly-built mine, and the design scale is 100 million tons of lead-zinc ores are mined and selected every year. The project construction reaches the production capacity of 31400 tons of annual lead concentrate, 46800 tons of zinc concentrate and 20200 tons of sulfur concentrate, and belongs to the field of underground mining, and a large amount of waste water generated in the underground and other operation processes in the mining process can be discharged after reaching the standard after being treated. A sewage treatment plant is built in the mine, and the wastewater entering the sewage treatment plant is of the following types:
(1) Underground drainage: -240m and above for production, normal water discharge 4331 m/d and maximum water discharge 6301 m/d;
(2) Initial rainwater: carrying out early stage rainfall amount 1470 m/d on stope and plant selection;
(3) Wastewater of a tailing pond seepage interception pond: conducting downward distillation at 250-300 m;
(4) Waste water of the waste stone yard: 1049m by transformation/d;
(5) Selecting redundant backwater of a plant: 189m conducting downward boring.
The underground wastewater contains metal elements such as zinc, cadmium, lead, nickel, arsenic and the like, and the PH is about 4. Wherein the zinc content of the wastewater reaches more than 13.3mg/L, and the wastewater can not degrade the zinc content in the wastewater through flocculation, coagulation and dezincification processes of the traditional water treatment process and has great influence on the quality of external drainage.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a production process for degrading the zinc content in wastewater by comprehensively stirring lime and zinc-containing wastewater.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a production process for degrading the zinc content in wastewater by comprehensively stirring lime and zinc-containing wastewater comprises the following steps:
s1, installing an interception dam and a seepage water tank in front of an adjusting tank, and installing a lime stirring barrel and one submersible pump on the seepage water tank in front of the adjusting tank;
s2, adding 100 kg of lime into a lime stirring barrel, pumping the zinc-containing wastewater into the lime stirring barrel by using a submersible pump for stirring and synthesizing, wherein the concentration is about 60%, and performing cyclic preparation and adding;
s3, stirring and synthesizing the wastewater and lime to obtain a comprehensive solution with the concentration of 60%, putting the comprehensive solution into a percolation water tank, and then circularly adding the comprehensive solution to settle zinc in the raw water into the percolation water tank;
s4, adjusting the pH value of the underground wastewater in the percolation water tank to about 10 by comprehensive mixing liquid which is obtained by mixing the wastewater and lime and is integrated to 60% concentration;
s5, putting the underground wastewater degraded to 3mg/L into a regulating tank for precipitation, and then performing dezincification treatment.
Further, the zinc removal treatment process comprises the following steps:
water is taken to a factory area through a floating pontoon for water treatment, the water enters a reaction tank, and a proper amount of PAC is added into the reaction tank; and then the wastewater enters a flocculation tank, a proper amount of PAM is added into the flocculation tank, then the wastewater enters a sedimentation tank, filter pressing treatment is carried out on bottom sludge at the bottom of the sedimentation tank, water at the top of the sedimentation tank enters a clean water tank, part of treated water in the clean water tank is pumped back to a high-level new water tank of a plant for the plant to use by the plant through a recycling water pump, the rest water is discharged by an external water discharge pump, and the content of zinc in the discharged water is reduced to below 1.3 mg/L.
Furthermore, a water absorption pit is arranged in the percolating water tank, and zinc in the water absorption pit is precipitated into the percolating water tank.
Further, the sedimentation tank is connected with a thickener, after the wastewater after the flocculation reaction is precipitated by the thickener, supernatant fluid overflows to a clean water tank for recycling or discharging, and bottom mud is conveyed to a filter press for filter pressing.
Further, the reaction tank is connected with a PAC integrated dosing device, the PAC integrated dosing device feeds PAC into the reaction tank, the PAC dosing amount is 10-20kg/d, the PAC dosing concentration is 8%, and the PAC dosing device is matched with a metering pump according to three times of pharmacy consideration in 1 day.
Further, the flocculation tank is connected with a PAM integrated dosing device, the PAM integrated dosing device doses PAM into the flocculation tank, the dosage of PAM is 200-400kg/d, the dosing concentration of PAM is 0.05-0.1%, and the PAM dosing device is matched with a metering pump according to three times of pharmacy consideration in 1 day.
Further, a liquid level indicator, a stirrer, a gate valve and a slurry discharge pipe are arranged in the lime stirring barrel, the installation height of the lime stirring barrel is 10.5 m, and the lime stirring barrel is vertically installed at an angle of 90 degrees.
The beneficial effects of the invention are as follows: 1. the underground wastewater is treated after multi-stage sedimentation in a three-stage sedimentation tank, an interception dam, a percolation water tank and a regulating reservoir, so that the content of COD (chemical oxygen demand) and zinc in the wastewater is greatly reduced.
2. A device for removing zinc in advance is adopted, namely a lime adding device is added in a percolating water tank, the waste water containing zinc is circularly and comprehensively degraded in a stirring barrel and the percolating water tank, and the zinc content can be reduced by more than 10 mg/L.
3. The water absorption pit is added in the percolating water tank, and degraded zinc is precipitated in the percolating water tank and cannot be pumped into the regulating tank along with the self-sucking pump to enter a sewage treatment process.
4. The wastewater in the seepage water tank and the lime stirring barrel form a circulation effect.
5. The lime replaces the action of liquid caustic soda, so that the content of zinc in the wastewater and the production cost are reduced.
6. The floating platform pump station (pontoon) in the adjusting tank adopts the flexible hose setting, can adjust the height of floating platform by oneself in order to control the height of the interior water level of adjusting tank.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
As shown in figure 1, a production process for degrading the zinc content in wastewater by comprehensively stirring lime and zinc-containing wastewater comprises the following steps:
s1, installing an interception dam and a water seepage tank in front of an adjusting tank, and installing a lime stirring barrel and a submersible pump on the water seepage tank in front of the adjusting tank. The lime agitator model is in the in 1.6m 2.0m, and the immersible pump model is QD 3-40-1.5, and the lime agitator is equipped with level indicator, agitator, gate valve (in 50 mm), grout discharging pipe (in 50 mm), and the lime agitator mounting height is 10.5 meters, and the angle is 90 upright installations.
S2, adding 100 kg of lime into a lime stirring barrel, pumping the zinc-containing wastewater into the lime stirring barrel by using a submersible pump for stirring and synthesizing, wherein the concentration is about 60%, and performing circulating preparation and adding.
S3, stirring and integrating the wastewater and lime to obtain a comprehensive solution with the concentration of 60%, feeding the comprehensive solution into a percolation water tank, and then circularly feeding the comprehensive solution to settle zinc in the raw water into the percolation water tank. A water absorption pit is built in the percolation water pool, the bottom plate of the water absorption pit is 20cm thick by C25 concrete, the pit wall of the water absorption pit is 30cm thick by C25 concrete (the pit wall is 100cm higher than the bottom plate and 120cm higher than the bottom plate), the net size of the plane of the water absorption pit is l5m (length) multiplied by 3m (width), and zinc is precipitated in the percolation water pool outside the pool.
And S4, adjusting the pH value of the underground wastewater in the seepage water tank to about 10 by comprehensive mixing liquid which is obtained by mixing the wastewater and lime and has the concentration of 60%. The zinc content in the underground wastewater is reduced from 13.3mg/L to about 3 mg/L.
S5, putting the underground wastewater degraded to 3mg/L into a regulating tank for precipitation, and then performing dezincification treatment. The specific process is that water is taken to a factory area through a pontoon for water treatment, the water enters a No. 1 reaction tank, and a proper amount of PAC is added into the reaction tank 1; then, the mixture enters a flocculation tank, and a proper amount of PAM is added into the flocculation tank; then the treatment is finished through a sedimentation tank. And returning part of the treated water to a high-level new water tank of the plant for use by the plant through a reuse water pump, and discharging the rest water by an external drainage pump, wherein the content of zinc in the external drainage is reduced to below 1.3 mg/L.
Further, the sedimentation tank is connected with a thickener, after the wastewater after the flocculation reaction is precipitated by the thickener, supernatant fluid overflows to a clean water tank for recycling or discharging, and bottom mud is conveyed to a filter press for filter pressing.
The reaction tank is connected with a PAC integrated dosing device, the PAC integrated dosing device doses PAC into the reaction tank, the PAC dosing amount is 10-20kg/d, the PAC dosing concentration is 8%, and the PAC dosing device is matched with a metering pump according to three pharmaceutical considerations of 1 day.
The flocculation tank is connected with a PAM (polyacrylamide) integrated dosing device, the PAM integrated dosing device feeds PAM into the flocculation tank, the dosage of the PAM is 200-400kg/d, the feeding concentration of the PAM is 0.05-0.1%, and the PAM dosing device is matched with a metering pump according to three times of pharmacy consideration in 1 day.
The equipment corresponding to the process comprises the following specific steps:
1) Waste water transferring facilities:
a floating platform pump station is arranged in the (wastewater) regulating reservoir, and wastewater in the (wastewater) regulating reservoir is conveyed to a wastewater treatment station for treatment. A set of floating platform pump stations (pontoon) is used: the matched water pumps Q =208m3/H and H =22m are used and prepared, and the floating platform pump station (floating ship) adopts a flexible hose to automatically adjust the height of the floating platform so as to control the height of the water level in the adjusting tank.
2) A reaction tank:
the wastewater firstly enters a No. 1 reaction tank and automatically flows to a No. 2 reaction tank after PAC medicament is added. The No. 1 and No. 2 reaction tanks respectively adopt circular reaction tanks: T/H =5000/6000mm, effective height is 5.15m, N =52r/min, and the speed is adjusted by frequency conversion.
3) A flocculation tank:
adding PAM in the flocculation tank to enable the PAM to perform flocculation reaction, wherein the flocculation tank is a circular reaction tank: T/H =4000/5000mm, effective height 4.15m, N =23r/min, recommended power P =11Kw of a matched stirrer, and variable frequency speed regulation.
4) A thickener:
after the wastewater after the flocculation reaction is precipitated by a thickener, supernatant fluid overflows to a clear water tank for recycling or discharging, and bottom mud is conveyed to a filter press for filter pressing. 1 set of 20m sedimentation tanks are adopted, the center is driven, and N =7.5KW.
5) A filter press:
1 set of filter press is adopted, the sediment of the thickener is filtered and stacked to a certain amount, and then transported to a tailing pond by an automobile. The filter area of the filter press is 120m < 2 >, the effective volume of the filter chamber is not less than 2m < 3 >, and the filter press is matched with an air compressor, a filter press feeding pump and a filtrate conveying pump.
6) PAC integration charge device:
PAC is added into a 1# reaction tank by adopting 1 set of PAC integrated dosing device, the dosage of PAC is 10-20kg/d, the adding concentration of PAC is 8%, and the PAC integrated dosing device is matched with a metering pump according to the pharmacy consideration of three times in 1 day.
7) PAM integration charge device:
adding PAM into a flocculation tank by adopting 1 set of PAM integrated dosing device, wherein the dosage of PAM is 200-400kg/d, the adding concentration of PAM is 0.05-0.1%, and the PAM integrated dosing device is matched with a metering pump according to the three-time pharmaceutical consideration in 1 day.
8) A recycling water pump:
and conveying a part of the treated water to a high-level water return tank of the plant selection through a water return pump for the plant selection. Two water return pumps are arranged, one water return pump is used and the other water return pump is used, and the performance parameters of a single water pump are as follows: q =100m for speed/H, H =180m for speed regulation by frequency conversion.
9) An external drainage pump:
and conveying the residual recycled water to a discharge point of the cold water river through an external drainage pump. Two external drainage pumps are arranged, one is used and the other is equipped, and the performance parameters of the single water pump are as follows: q =100m for speed/H, H =25m for speed regulation by frequency conversion.
10 Thickener zone sump pump:
and sewage collected by the thickener, the reaction tank and the trench in the flocculation tank area is conveyed to the No. 1 reaction tank through a ground pump pit. Two pit pumps are arranged, the two pit pumps work discontinuously, and the performance parameters of a single water pump are as follows: q =20m, H =25m.
11 Auxiliary pit pump:
and sewage collected by ditches in the auxiliary medicine adding room and the dehydration workshop area is conveyed to the No. 1 reaction tank through a ground pump pit. If 1 pit pump, interrupted work, individual water pump performance parameter: q =20 m/H, H =25m.
In conclusion, the underground wastewater is treated after multistage sedimentation in the three-stage sedimentation tank, the interception dam, the percolation water tank and the regulating reservoir, so that the content of COD (chemical oxygen demand) and zinc in the wastewater is greatly reduced.
The process adopts a device for removing zinc in advance, namely, a lime adding device is added in a percolation water tank and zinc-containing wastewater is circularly and comprehensively degraded in a stirring barrel and the percolation water tank, and the zinc content can be reduced by more than 10 mg/L.
The water absorption pit is added in the percolation water tank, and degraded zinc is precipitated in the percolation water tank and cannot be pumped into the regulating tank along with the self-priming pump to enter a sewage treatment process. The wastewater in the seepage water tank and the lime stirring barrel form a circulation effect.
The process adopts lime to replace liquid caustic soda, and reduces the zinc content in the wastewater and the production cost.
A floating platform pump station (pontoon) in the regulating tank is provided with a flexible hose, and the height of the floating platform can be automatically regulated so as to control the height of the water level in the regulating tank.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A production process for degrading the zinc content in wastewater by comprehensively stirring lime and zinc-containing wastewater is characterized by comprising the following steps:
s1, installing an interception dam and a seepage water tank in front of an adjusting tank, and installing a lime stirring barrel and one submersible pump on the seepage water tank in front of the adjusting tank;
s2, adding 100 kg of lime into a lime stirring barrel, pumping the zinc-containing wastewater into the lime stirring barrel by using a submersible pump for stirring and synthesizing, wherein the concentration is about 60%, and performing cyclic preparation and adding;
s3, stirring and synthesizing the wastewater and lime to obtain a comprehensive solution with the concentration of 60%, putting the comprehensive solution into a percolation water tank, and then circularly adding the comprehensive solution to settle zinc in the raw water into the percolation water tank;
s4, adjusting the pH value of the underground wastewater in the percolation water tank to about 10 by comprehensive mixing liquid which is obtained by mixing the wastewater and lime and is integrated to 60% concentration;
s5, putting the underground wastewater degraded to 3mg/L into a regulating tank for precipitation, and then performing dezincification treatment.
2. The production process for degrading the zinc content in the wastewater by comprehensively stirring the lime and the zinc-containing wastewater according to claim 1, wherein the zinc removal treatment process comprises the following steps:
water is taken to a factory area through a floating pontoon for water treatment, the water enters a reaction tank, and a proper amount of PAC is added into the reaction tank; then the wastewater enters a flocculation tank, a proper amount of PAM is added into the flocculation tank, then the wastewater enters a sedimentation tank, filter pressing treatment is carried out on bottom mud at the bottom of the sedimentation tank, water at the top of the sedimentation tank enters a clean water tank, part of the treated water in the clean water tank is pumped back to a high-level new water tank of a plant for the use of the plant, the rest water is discharged by an external discharge pump, and the zinc content of the external discharge water is reduced to below 1.3 mg/L.
3. The production process for degrading the zinc content in the wastewater by comprehensively stirring the lime and the zinc-containing wastewater according to claim 1, wherein a water absorption pit is arranged in the percolation water tank, and zinc is precipitated in the water absorption pit.
4. The production process for degrading the content of zinc in wastewater by comprehensively stirring lime and zinc-containing wastewater according to claim 2, characterized in that the sedimentation tank is connected with a thickener, the wastewater after flocculation reaction is precipitated by the thickener, the supernatant overflows to a clear water tank for recycling or discharging, and the bottom sludge is conveyed to a filter press for filter pressing.
5. The production process for comprehensively stirring and degrading the zinc content in the wastewater by using lime and the zinc-containing wastewater according to claim 2, characterized in that the reaction tank is connected with a PAC integrated dosing device, the PAC integrated dosing device doses PAC into the reaction tank, the dosage of PAC is 10-20kg/d, the PAC dosing concentration is 8%, and the production process is matched with a metering pump according to three pharmaceutical considerations in 1 day.
6. The production process for comprehensively stirring and degrading the zinc content in the wastewater by using the lime and the zinc-containing wastewater according to claim 2, is characterized in that the flocculation tank is connected with a PAM (polyacrylamide) integrated dosing device, the PAM integrated dosing device feeds PAM into the flocculation tank, the dosage of the PAM is 200-400kg/d, the feeding concentration of the PAM is 0.05-0.1%, and the production process is matched with a metering pump according to three pharmaceutical considerations of 1 day.
7. The production process for comprehensively stirring and degrading the zinc content in the wastewater by using lime and the zinc-containing wastewater according to claim 2, wherein a lime stirring barrel is provided with a liquid level indicator, a stirrer, a gate valve and a slurry discharge pipe, the lime stirring barrel is installed at a height of 10.5 m and is vertically installed at an angle of 90 degrees.
Priority Applications (1)
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