CN111892257A - Aluminum product production wastewater treatment system and treatment process thereof - Google Patents
Aluminum product production wastewater treatment system and treatment process thereof Download PDFInfo
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- CN111892257A CN111892257A CN202010964354.3A CN202010964354A CN111892257A CN 111892257 A CN111892257 A CN 111892257A CN 202010964354 A CN202010964354 A CN 202010964354A CN 111892257 A CN111892257 A CN 111892257A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 90
- 239000002351 wastewater Substances 0.000 claims abstract description 45
- 239000013505 freshwater Substances 0.000 claims abstract description 35
- 238000004062 sedimentation Methods 0.000 claims abstract description 29
- 238000005345 coagulation Methods 0.000 claims abstract description 23
- 230000015271 coagulation Effects 0.000 claims abstract description 23
- 238000000926 separation method Methods 0.000 claims abstract description 21
- 238000005188 flotation Methods 0.000 claims abstract description 20
- 230000001112 coagulating effect Effects 0.000 claims abstract 4
- 239000010802 sludge Substances 0.000 claims description 59
- 239000000047 product Substances 0.000 claims description 26
- 244000005700 microbiome Species 0.000 claims description 18
- 229920002401 polyacrylamide Polymers 0.000 claims description 17
- 238000005728 strengthening Methods 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 12
- 239000001110 calcium chloride Substances 0.000 claims description 12
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 12
- 239000006228 supernatant Substances 0.000 claims description 12
- 238000005273 aeration Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 230000003716 rejuvenation Effects 0.000 claims description 8
- 238000001556 precipitation Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 5
- 230000003203 everyday effect Effects 0.000 claims description 5
- 238000010992 reflux Methods 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000003814 drug Substances 0.000 claims description 3
- 239000011737 fluorine Substances 0.000 claims description 3
- 229910052731 fluorine Inorganic materials 0.000 claims description 3
- 150000002222 fluorine compounds Chemical class 0.000 claims description 3
- -1 fluorine ions Chemical class 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 239000002244 precipitate Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- 238000010517 secondary reaction Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 238000007790 scraping Methods 0.000 claims description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 abstract description 7
- 239000003921 oil Substances 0.000 description 14
- 235000019198 oils Nutrition 0.000 description 14
- 230000014759 maintenance of location Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000839 emulsion Substances 0.000 description 5
- 230000001376 precipitating effect Effects 0.000 description 3
- 241000186361 Actinobacteria <class> Species 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035755 proliferation Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
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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
- 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
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- 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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- 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
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
- C02F2101/14—Fluorine or fluorine-containing 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
- C02F3/02—Aerobic processes
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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
- C02F7/00—Aeration of stretches of water
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses an aluminum product production wastewater treatment system and a treatment process thereof, and the system comprises a concentrated water adjusting tank, a demulsification oil separation tank, a fresh water adjusting tank, a coagulation tank, an air flotation machine, an aerobic tank and a secondary sedimentation tank; the water outlet of the concentrated water adjusting tank is connected with the water inlet of the demulsification oil separation tank through a pump, the water outlet of the demulsification oil separation tank is connected with the water inlet of the fresh water adjusting tank through a pipeline, the water outlet of the fresh water adjusting tank is connected with the water inlet of the coagulating sedimentation tank through a pump, the water outlet of the coagulating sedimentation tank is connected with the water inlet of the air flotation machine through a pipeline, the water outlet of the air flotation machine is connected with the water inlet of the aerobic tank through a pipeline, and the water outlet of the aerobic tank is connected with the inlet port of the secondary sedimentation tank through a pipeline. The invention adopts a pretreatment process combining coagulation and air floatation, removes the fluoride by two steps, improves the total removal rate of the fluoride and realizes the discharge of the first-grade A standard of the wastewater in the aluminum product production.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a system and a process for treating wastewater generated in aluminum product production.
Background
The waste water produced in the pop can production is mainly generated in the processes of stretching and washing the pop can, and the waste water comprises the following basic components: the system comprises emulsion-containing wastewater generated by a stretcher, cleaning wastewater generated by a tank washing machine, regeneration wastewater generated by a deionized water system, terrace cleaning water and reverse osmosis concentrated water.
In the wastewater produced by the pop can, the total concentration of organic matters is not high but the biodegradability is poor, raw water contains a large amount of suspended matters, the concentration of fluoride in the wastewater is high, and the wastewater contains parts of components such as petroleum and surfactant, and the COD can be controlled to be between 150 and 200mg/L by adopting the traditional treatment process, so that the discharge requirement of the first-class A standard, namely the COD is less than or equal to 50mg/L, is difficult to meet.
Disclosure of Invention
In order to solve the technical problem, the invention provides an aluminum product production wastewater treatment system and a treatment process thereof.
In order to achieve the purpose, the invention provides the following technical scheme:
a treatment system for aluminum product production wastewater comprises a concentrated water adjusting tank, a demulsification oil separation tank, a fresh water adjusting tank, a coagulation tank, an air flotation machine, an aerobic tank and a secondary sedimentation tank;
the water outlet of the concentrated water adjusting tank is connected with the water inlet of the demulsification oil separation tank through a pump, the water outlet of the demulsification oil separation tank is connected with the water inlet of the fresh water adjusting tank through a pipeline, the water outlet of the fresh water adjusting tank is connected with the water inlet of the coagulation tank through a pump, the water outlet of the coagulation tank is connected with the water inlet of the air floatation machine through a pipeline, the water outlet of the air floatation machine is connected with the water inlet of the aerobic tank through a pipeline, and the water outlet of the aerobic tank is connected with the inlet port of the secondary sedimentation tank through a pipeline.
Preferably, the concentrated water adjusting tank is provided with an aeration device for stirring periodically to prevent sludge from precipitating.
Preferably, the demulsification oil separation tank is connected with an acid adding device.
Preferably, the fresh water adjusting tank is provided with an aeration device for stirring periodically to prevent sludge from precipitating.
Preferably, the reaction zone of the coagulation tank is connected with a dosing device.
Preferably, the dosing devices include an alkali dosing device, a calcium chloride dosing device, a PAC dosing device, and a PAM dosing device.
Preferably, the sedimentation area of the coagulation tank is provided with an inclined pipe to improve sedimentation efficiency.
Preferably, a sludge discharge pipe is arranged at the bottom of the sedimentation area of the coagulation tank and is connected with the sludge concentration tank.
Preferably, the front end of the air floatation machine is connected with the calcium chloride dosing device, the PAC dosing device and the PAM dosing system.
Preferably, the aerobic pool is provided with a microorganism strengthening device, a feed inlet, a discharge outlet and a liquid adding opening, the feed inlet is connected with the middle section of the aerobic pool through a pump, the liquid discharge opening is connected with the front section of the aerobic pool, and the liquid adding opening is connected with a culture solution storage tank through a pump; the microorganism strengthening device periodically extracts activated sludge from the middle section of the aerobic tank through the feeding hole to rejuvenate strains, and discharges the rejuvenated activated sludge into the front section of the aerobic tank through the discharging hole, so that the strengthening function of aerobic microorganisms is realized.
Preferably, the secondary sedimentation tank is connected with the sludge concentration tank through a sludge pump.
The invention also provides a treatment process of the aluminum product production wastewater, in particular to a wastewater treatment system for aluminum product production wastewater treatment, which comprises the following steps:
s1, enabling concentrated water in an aluminum product production workshop to enter a concentrated water adjusting tank, and stirring by using an aeration device to homogenize water quality;
s2, discharging the wastewater homogenized by the concentrated water adjusting tank into a demulsification oil separation tank through a pump, adjusting the pH to 2 through an acid adding device, scraping scum generated after demulsification is finished by a scum scraper, feeding the scum into a sludge concentration tank, and automatically flowing the wastewater into a fresh water adjusting tank;
s3, automatically flowing the waste water into a fresh water adjusting tank after being treated by a demulsification oil separation tank, and automatically flowing the waste water into the fresh water adjusting tank together with the waste water in other aluminum product production workshops in the fresh water adjusting tank, wherein an aeration device is arranged at the bottom of the fresh water adjusting tank and used for balancing the water quality and the water quantity;
s4, pumping the wastewater homogenized by the fresh water adjusting tank to a reaction zone of a coagulation tank, adjusting the pH of the wastewater to 9 in the reaction zone, adding calcium chloride, PAC (polyaluminium chloride) and PAM (polyacrylamide) medicaments to flocculate and precipitate suspended matters and fluorine ions in the wastewater, feeding supernatant into an air flotation machine, and discharging sludge in the precipitation zone into a sludge concentration tank;
s5, carrying out secondary reaction on the supernatant entering the air flotation machine and calcium chloride, PAC (polyaluminium chloride) and PAM (polyacrylamide) at the front end of the air flotation machine to further remove fluorides in water, enabling generated scum to enter a sludge concentration tank, and enabling water discharged from the air flotation machine to enter an aerobic tank;
s6, the volume load of the aerobic tank is 0.4-0.6 kgCOD/(m)3D), the sludge concentration is 4000mg/L, the dissolved oxygen at the tail end of the aerobic tank is controlled to be 3.5-4mg/L, the aerobic tank is provided with a microorganism strengthening device and runs once a day, the running time is 20h, sludge is extracted from the middle section of the aerobic tank and enters the microorganism strengthening device for strain rejuvenation, rejuvenated strains are discharged into the front end of the aerobic tank, 3kg of activated carbon powder is regularly added into the aerobic tank every day, organic matters in water are adsorbed by utilizing the adsorption effect of activated carbon, and meanwhile, a carrier is provided for the strains by utilizing the characteristic of high specific surface area of the activated carbon, so that the sludge concentration is improved;
s7, discharging the effluent of the aerobic tank out of a secondary sedimentation tank, performing gravity sedimentation, discharging the supernatant after reaching the standard, refluxing a part of sludge at the bottom of the tank to the front end of the aerobic tank for supplementing strains, and feeding the residual sludge into a sludge concentration tank;
s8, after gravity concentration of sludge in the sludge concentration tank, supernatant enters a fresh water adjusting tank, and the sludge is dewatered and transported outside.
Preferably, the hydraulic retention time of the concentrated water adjusting pond in the step S1 is 24 h.
Preferably, the hydraulic retention time of the demulsification oil separation tank in the step S2 is 10 min.
Preferably, the hydraulic retention time of the fresh water regulating reservoir in the step S3 is 24 h.
Preferably, the reaction time of the reaction zone of the coagulation tank in the step S4 is not less than 10min, and the surface load of the precipitation zone is 0.8m3/(m2H), the precipitation time was 3 h.
Preferably, the surface load of the secondary sedimentation tank in the step S7 is 0.6m3/(m2H), the settling time is 2h, and the sludge reflux ratio is 50-100%.
Preferably, the equipment used for dewatering in step S8 is a plate and frame filter press.
The invention has the beneficial effects that:
(1) the invention realizes the discharge of the first-level A standard of the wastewater generated in the aluminum product production, separately collects the high-concentration wastewater containing the emulsion and other wastewater, adopts an independent pretreatment process, reduces the equipment investment, improves the pretreatment effect and reduces the operating cost;
(2) a pretreatment process combining coagulation and air floatation is selected, and fluoride is removed in two steps, so that the total removal rate of the fluoride is improved;
(3) the microbial strengthening device is utilized to expand and cultivate the dominant strains on a large scale, so that the number of the dominant strains in the aerobic tank is maintained at 1.0 multiplied by 109Above CFU/mL, the capability of the microorganism for decomposing organic matters is improved, and meanwhile, the proliferation of other microorganisms such as filamentous bacteria and actinomycetes can be controlled, and the sludge bulking and the formation of biological foams are inhibited.
(4) By adding the activated carbon powder every day, organic matters in water can be adsorbed, and an adhesion carrier is provided for strains, so that the concentration of the strains is improved.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic view of the overall structure according to the present invention.
Detailed Description
Example 1 treatment of wastewater from aluminum production
The concentrated water COD for treating the aluminum product production wastewater is 550-550 mg/L and contains 0.5-1% of emulsion, the emulsion mainly comprises mineral oil, vegetable oil, synthetic ester and other substances, the biodegradability is low (B/C is less than 0.2), the COD for biochemical treatment by the conventional treatment process can only reach 150-100-mg/L, and when the effluent standard is stricter, the effects of adopting ozone, Fenton and the like at the rear section of a biochemical pool are not ideal.
The aluminum product production wastewater treatment system shown in fig. 1 comprises a concentrated water adjusting tank 1, a demulsification oil separation tank 2, a fresh water adjusting tank 3, a coagulation tank 4, an air flotation machine 5, an aerobic tank 6 and a secondary sedimentation tank 7;
the water outlet of the concentrated water adjusting tank 1 is connected with the water inlet of the demulsification oil separating tank 2 through a pump, the water outlet of the demulsification oil separating tank 2 is connected with the water inlet of the fresh water adjusting tank 3 through a pipeline, the water outlet of the fresh water adjusting tank 3 is connected with the water inlet of the coagulation tank 4 through a pump, the water outlet of the coagulation tank 4 is connected with the water inlet of the air floatation machine 5 through a pipeline, the water outlet of the air floatation machine 5 is connected with the water inlet of the aerobic tank 6 through a pipeline, and the water outlet of the aerobic tank 6 is connected with the water inlet of the secondary sedimentation tank 7 through a pipeline.
Preferably, the concentrated water adjusting tank 1 is provided with an aeration device for stirring periodically to prevent sludge sedimentation.
Preferably, the demulsification oil separation tank 2 is connected with an acid adding device.
Preferably, the fresh water adjusting tank 3 is provided with an aeration device for stirring periodically to prevent sludge sedimentation.
Preferably, the reaction zone 4-1 of the coagulation tank 4 is connected with a dosing device.
Preferably, the dosing devices include an alkali dosing device, a calcium chloride dosing device, a PAC dosing device, and a PAM dosing device.
Preferably, the sedimentation zone 4-2 of the coagulation basin 4 is provided with an inclined pipe to improve sedimentation efficiency.
Preferably, a sludge discharge pipe is arranged at the bottom of the sedimentation zone 4-2 of the coagulation tank 4 and is connected with the sludge concentration tank.
Preferably, the front end of the air floatation machine 5 is connected with the calcium chloride dosing device, the PAC dosing device and the PAM dosing system.
Preferably, the aerobic tank 6 is provided with a microorganism strengthening device 8, a feed inlet, a discharge outlet and a liquid feeding port, wherein the feed inlet is connected with the middle section of the aerobic tank 6 through a pump, the liquid discharge port is connected with the front section of the aerobic tank 6, and the liquid feeding port is connected with a culture solution storage tank through a pump; the microorganism strengthening device periodically extracts activated sludge from the middle section of the aerobic tank through the feeding hole to rejuvenate strains, and discharges the rejuvenated activated sludge into the front section of the aerobic tank through the discharging hole, so that the strengthening function of aerobic microorganisms is realized.
Preferably, the secondary sedimentation tank 7 is connected with the sludge concentration tank through a sludge pump.
The invention also provides a treatment process of the aluminum product production wastewater, in particular to a wastewater treatment system for aluminum product production wastewater treatment, which comprises the following steps:
s1, enabling concentrated water in an aluminum product production workshop to enter a concentrated water adjusting tank, enabling the hydraulic retention time of the concentrated water adjusting tank to be 24 hours, and stirring by using an aeration device to homogenize the water quality;
s2, discharging the wastewater homogenized by the concentrated water adjusting tank into a demulsification oil separation tank through a pump, wherein the hydraulic retention time of the demulsification oil separation tank is 10min, the pH value is adjusted to be 2 by an acid adding device, scum generated after demulsification is completed is scraped out by a scum scraper and enters a sludge concentration tank, and the wastewater automatically flows into a fresh water adjusting tank;
s3, mixing the wastewater which flows into the fresh water regulating reservoir automatically after being treated by the demulsification oil separation reservoir with wastewater of other aluminum product production workshops in the fresh water regulating reservoir, wherein the hydraulic retention time of the fresh water regulating reservoir is 24 hours, and an aeration device is arranged at the bottom of the fresh water regulating reservoir and used for balancing the water quality and the water quantity;
s4, pumping the wastewater homogenized by the fresh water adjusting tank to a reaction zone of the coagulation tank, wherein the reaction time of the reaction zone is not less than 10min, and the surface load of the precipitation zone is 0.8m3/(m2H), precipitating for 3h, adjusting the pH of the wastewater to 9 in a reaction zone, adding calcium chloride, PAC and PAM medicaments to flocculate and precipitate suspended matters and fluorine ions in the wastewater, feeding supernatant into an air floatation machine, and settling in a settling zoneDischarging the sludge into a sludge concentration tank;
s5, carrying out secondary reaction on the supernatant entering the air flotation machine and calcium chloride, PAC (polyaluminium chloride) and PAM (polyacrylamide) at the front end of the air flotation machine to further remove fluorides in water, enabling generated scum to enter a sludge concentration tank, and enabling water discharged from the air flotation machine to enter an aerobic tank;
s6, the volume load of the aerobic tank is 0.4-0.6 kgCOD/(m)3D), the sludge concentration is 4000mg/L, the dissolved oxygen at the tail end of the aerobic tank is controlled to be 3.5-4mg/L, the aerobic tank is provided with a microorganism strengthening device and runs once a day, the running time is 20h, sludge is extracted from the middle section of the aerobic tank and enters the microorganism strengthening device for strain rejuvenation, rejuvenated strains are discharged into the front end of the aerobic tank, 3kg of activated carbon powder is regularly added into the aerobic tank every day, organic matters in water are adsorbed by utilizing the adsorption effect of activated carbon, and meanwhile, a carrier is provided for the strains by utilizing the characteristic of high specific surface area of the activated carbon, so that the sludge concentration is improved;
s7, discharging the effluent of the aerobic tank out of the secondary sedimentation tank, wherein the surface load is 0.6m3/(m2H), the settling time is 2h, the sludge reflux ratio is 50-100%, after gravity settling, supernatant reaches the standard and is discharged, a part of sludge at the bottom of the pool reflows to the front end of the aerobic pool for supplementing strains, and the rest sludge enters a sludge concentration pool;
s8, after gravity concentration of sludge in the sludge concentration tank, supernatant enters a fresh water adjusting tank, and the sludge is dewatered and transported outside.
Preferably, the equipment used for dewatering in step S8 is a plate and frame filter press.
According to the actual waste water requirement, the front end of the aerobic tank can be provided with an anaerobic unit.
The invention realizes the discharge of the first-level A standard of the wastewater generated in the aluminum product production, separately collects the concentrated water of the high-concentration workshop containing the emulsion and other wastewater, adopts an independent pretreatment process, reduces the equipment investment, improves the pretreatment effect and reduces the operation cost; a pretreatment process combining coagulation and air floatation is selected, and fluoride is removed in two steps, so that the total removal rate of the fluoride is improved; the microbial strengthening device is utilized to expand and cultivate the dominant strains on a large scale, so that the number of the dominant strains in the aerobic tank is maintained to be 1.0109Above CFU/mL, the capability of the microorganism for decomposing organic matters is improved, and meanwhile, the proliferation of other microorganisms such as filamentous bacteria and actinomycetes can be controlled, and the sludge bulking and the formation of biological foams are inhibited. By adding the activated carbon powder every day, organic matters in water can be adsorbed, and an adhesion carrier is provided for strains, so that the concentration of the strains is improved.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A treatment system for aluminum product production wastewater is characterized by comprising a concentrated water adjusting tank, a demulsification oil separation tank, a fresh water adjusting tank, a coagulation tank, an air flotation machine, an aerobic tank and a secondary sedimentation tank;
the water outlet of the concentrated water adjusting tank is connected with the water inlet of the demulsification oil separation tank through a pump, the water outlet of the demulsification oil separation tank is connected with the water inlet of the fresh water adjusting tank through a pipeline, the water outlet of the fresh water adjusting tank is connected with the water inlet of the coagulating sedimentation tank through a pump, the water outlet of the coagulating sedimentation tank is connected with the water inlet of the air flotation machine through a pipeline, the water outlet of the air flotation machine is connected with the water inlet of the aerobic tank through a pipeline, and the water outlet of the aerobic tank is connected with the inlet port of the secondary sedimentation tank through a pipeline.
2. The aluminum product production wastewater treatment system of claim 1, wherein the demulsification oil separation tank is connected with an acid adding device.
3. The aluminum product production wastewater treatment system of claim 1, wherein the reaction zone of the coagulation tank is connected with a dosing device.
4. The aluminum product production wastewater treatment system of claim 3, wherein the dosing device comprises an alkali dosing device, a calcium chloride dosing device, a PAC dosing device, and a PAM dosing device.
5. The aluminum product production wastewater treatment system of claim 1, wherein the front end of the air flotation machine is connected to the calcium chloride dosing device, the PAC dosing device, and the PAM dosing system.
6. The aluminum product production wastewater treatment system according to claim 1, wherein the aerobic tank is provided with a microorganism enhancement device, the microorganism enhancement device is provided with a feed inlet, a discharge outlet and a liquid feeding port, the feed inlet is connected with the middle section of the aerobic tank through a pump, the liquid discharge port is connected with the front section of the aerobic tank, and the liquid feeding port is connected with the culture solution storage tank through a pump.
7. A treatment process of aluminum product production wastewater, which is characterized by utilizing the aluminum product production wastewater treatment system of any one of claims 1 to 6 to perform wastewater treatment, and specifically comprises the following steps:
s1, enabling concentrated water in an aluminum product production workshop to enter a concentrated water adjusting tank, and stirring by using an aeration device to homogenize water quality;
s2, discharging the homogenized wastewater into a demulsification oil separation tank through a pump, adjusting the pH to 2 through an acid adding device, scraping scum generated after demulsification is finished by a residue scraper, feeding the scum into a sludge concentration tank, and automatically flowing the wastewater into a fresh water adjusting tank;
s3, mixing the wastewater which flows into the fresh water regulating reservoir automatically after being treated by the demulsification oil separation reservoir with wastewater in other aluminum product production workshops in the fresh water regulating reservoir, wherein an aeration device is arranged at the bottom of the fresh water regulating reservoir and used for balancing water quality and water quantity;
s4, pumping the wastewater homogenized by the fresh water adjusting tank to a reaction zone of a coagulation tank, adjusting the pH of the wastewater to 9 in the reaction zone, adding calcium chloride, PAC (polyaluminium chloride) and PAM (polyacrylamide) medicaments to flocculate and precipitate suspended matters and fluorine ions in the wastewater, feeding supernatant into an air flotation machine, and discharging sludge in the precipitation zone into a sludge concentration tank;
s5, carrying out secondary reaction on the supernatant entering the air flotation machine and calcium chloride, PAC (polyaluminium chloride) and PAM (polyacrylamide) at the front end of the air flotation machine to further remove fluorides in water, enabling generated scum to enter a sludge concentration tank, and enabling water discharged from the air flotation machine to enter an aerobic tank;
s6, the volume load of the aerobic tank is 0.4-0.6 kgCOD/(m)3D), the sludge concentration is 4000mg/L, the dissolved oxygen at the tail end of the aerobic pool is controlled to be 3.5-4mg/L, the aerobic pool is provided with a microorganism strengthening device, the aerobic pool runs once a day, the running time is 20 hours, sludge is extracted from the middle section of the aerobic pool and enters the microorganism strengthening device for strain rejuvenation, and the rejuvenated strains are discharged to the front end of the aerobic pool;
s7, discharging the effluent of the aerobic tank out of a secondary sedimentation tank, performing gravity sedimentation, discharging the supernatant after reaching the standard, refluxing a part of sludge at the bottom of the tank to the front end of the aerobic tank for supplementing strains, and feeding the residual sludge into a sludge concentration tank;
s8, after gravity concentration of sludge in the sludge concentration tank, supernatant enters a fresh water adjusting tank, and the sludge is dewatered and transported outside.
8. The process of claim 7, wherein the aerobic tank of step S6 is filled with 3kg of activated carbon powder periodically every day.
9. The treatment process according to claim 7, wherein the reaction time of the reaction zone of the coagulation tank in the step S4 is not less than 10min, and the surface load of the precipitation zone is 0.8m3/(m2H), the precipitation time was 3 h.
10. The treatment process according to claim 7, wherein the surface load of the secondary sedimentation tank in the step S7 is 0.6m3/(m2H), the settling time is 2h, and the sludge reflux ratio is 50-100%.
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