CN111747619A - Treatment method for removing zinc in electroplating wastewater - Google Patents
Treatment method for removing zinc in electroplating wastewater Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/005—Combined electrochemical biological processes
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- C—CHEMISTRY; METALLURGY
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/347—Use of yeasts or fungi
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- 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
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
Abstract
The invention discloses a treatment method for removing zinc in electroplating wastewater, which comprises the steps of sequentially treating the wastewater by a water collecting well, a coarse grid, a primary sedimentation tank, a pH value adjusting tank, a pulse high-voltage electricity-microorganism flocculation reaction tank, an aeration oxidation tank, a biological denitrification tank, a secondary sedimentation tank and a water purifying tank. The method creatively utilizes the flocculation property of the microorganisms of the common beer yeast and the bacillus licheniformis, and stimulates the adsorption and bridging property of the beer yeast and the bacillus licheniformis to zinc ions through the pulse high-voltage discharge process with a specific peak pressure value, so that the zinc ions in the wastewater generate flocculation reaction on the surfaces of the microorganisms to gradually form flocs with larger diameters, and finally the flocs are removed through the precipitation process. Meanwhile, the beer yeast and the bacillus licheniformis are common microorganisms, are easy to obtain and low in cost, and can greatly reduce the material cost of wastewater treatment.
Description
Technical Field
The invention relates to a treatment method for removing zinc ions in electroplating wastewater, belonging to the field of wastewater treatment in environmental protection.
Background
With the rapid development of industrial production, heavy metal pollution in water is more and more serious, wherein zinc is one of toxic pollutants in electroplating wastewater. After the zinc-containing wastewater is directly discharged into the environment without being treated, the zinc-containing wastewater can reach a certain concentration level in certain organisms through food chain circulation and finally accumulate in human bodies to harm human health. Therefore, the development of an economic and effective method for treating the pollution of heavy metals such as zinc and the like becomes an important content of the current water pollution treatment, and is also more and more paid more attention by people. The method for treating the zinc and other heavy metal pollution in the electroplating wastewater comprises the following steps: ion exchange, adsorption, chemical precipitation, membrane separation, and the like.
(1) The ion exchange method is to exchange ions in water with ions on an ion exchanger to achieve the purpose of removing harmful ions in water. At present, the zinc-containing wastewater treated by the method is treated by ion exchange resin at home and abroad.
(2) The adsorption method is a method for removing heavy metal ions in wastewater by applying various porous adsorption materials. The activated carbon is a traditional adsorption material, has strong adsorption capacity and high removal rate, but has low regeneration efficiency. Some natural materials, such as natural zeolite, are low in price and wide in source, and are mineral materials which are used for heavy metal pollution treatment at the earliest time.
(3) The membrane separation is realized by using a semipermeable membrane without changing the chemical form of the solution under the external action. The method is an efficient separation process, the energy consumption of the separation process is low, the working temperature is room temperature, the maintenance is convenient, the reliability of the equipment is high, the treatment capacity and the equipment scale are changed within a large range, the occupied area is small, the secondary pollution cannot be generated, but the membrane is expensive and is easy to be polluted.
(4) The chemical precipitation method is a method of adding some chemical substances into the wastewater to make the chemical substances and pollutants in the wastewater generate direct chemical reaction to generate precipitates which are difficult to dissolve in water, so that the pollutants are separated and removed. However, the treatment by the method only transfers the pollutants in the waste water and has the possibility of causing secondary pollution.
(5) The electrolysis method converts electric energy into chemical energy to generate oxidation-reduction reaction near an electrode in the electrolysis bath, thereby purifying the wastewater. Namely, the waste water is subjected to an electrolytic reaction, and toxic substances in the waste water are subjected to oxidation-reduction reactions at an anode and a cathode respectively to generate new substances. Compared with the chemical precipitation method, the electrolysis method has the advantages of short period, low operation cost, low energy consumption and ineffectiveness in recovery of zinc, but has large consumption of anode material iron and large occupied area.
At present, the existing zinc-containing electroplating wastewater treatment method has the defects of high cost, low efficiency, high energy consumption, secondary pollution and the like. Therefore, there is a need to get rid of the existing treatment technical idea, develop a new way for treating zinc in electroplating wastewater, and further develop a new form of zinc treatment technology in electroplating wastewater.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a treatment method for removing zinc ions in electroplating wastewater, the electroplating wastewater containing zinc ions enters a water collecting well through a wastewater pipeline, centralized collection and preliminary stable adjustment are carried out, the outlet of the water collecting well is connected with a coarse grating through the wastewater pipeline, large-diameter solid matters in the wastewater are removed, the outlet of the coarse grating is connected with a primary sedimentation tank through the wastewater pipeline, insoluble matters in the wastewater are further removed, the outlet of the primary sedimentation tank is connected with a pH value adjusting tank through the wastewater pipeline, the wastewater is precisely adjusted in the pH value, the pH value range of the outlet water of the pH value adjusting tank is 6.5-8.0 so as to meet the requirement of the inlet water pH value of a pulse high-voltage electricity-microorganism flocculation reaction tank, the outlet of the pH value adjusting tank is connected with the pulse high-voltage electricity-microorganism flocculation reaction tank through the wastewater pipeline, the outlet of the aeration oxidation pond is connected with a biological denitrification pond through a waste water pipeline, and the biological denitrification pond has the effects of decomposing and converting nitrate nitrogen in waste water through a biological activity reaction process so as to remove the nitrate nitrogen; the device comprises a pulse high-tension electricity-microorganism flocculation reaction tank, a water inlet valve, a water outlet valve, a sludge discharge port; after the pH value adjustment treatment (the pH value after the treatment is 6.5-8.0), the electroplating wastewater enters the reaction tank through a water inlet valve at the lower left part of a pulse high-voltage electricity-microorganism flocculation reaction tank, 3 sets of driving motors at the top of the reaction tank start to work, 3 sets of microorganism flocculation stirring brushes are driven by 3 driving rotating shafts arranged below the reaction tank to start stirring motion with the frequency of 20 r/min in the wastewater, so that beer yeast and bacillus licheniformis strains attached to the microorganism flocculation stirring brushes are fully contacted with the wastewater, meanwhile, underwater discharge electrodes at the middle parts of the left side and the right side of the tank start to perform high-voltage pulse discharge with the peak voltage of 20kV at the frequency of 15-20 times/sec, the pulse high-voltage discharge process can excite the adsorption and bridging characteristics of the beer yeast and the bacillus licheniformis to zinc ions, so that the zinc ions in the wastewater generate flocculation reaction on the surfaces of the microorganisms, flocculate with larger diameter is gradually formed and finally settled at the bottom of the tank body according to the situation of sludge, the sludge is pushed by an electric sludge pushing device at the left lower part of the tank body and is discharged out of the system through a sludge discharge outlet and is recycled, and meanwhile, the wastewater after the flocculation purification treatment is discharged out of the reaction tank through a water outlet valve at the right upper part of the tank body and enters the next treatment process. The pH value adjusting tank is used for adjusting the pH value of the wastewater subjected to primary precipitation to 6.5-8.0 so as to meet the requirement of the pH value of the inlet water of the pulse high-voltage electricity-microorganism flocculation reaction tank; wherein, the aeration oxidation tank is used for converting various nitrogenous substances in the wastewater into nitrate nitrogen through an aerobic aeration process; the biological denitrification tank is used for decomposing and converting nitrate nitrogen in the wastewater through a biological activity reaction process so as to remove the nitrate nitrogen.
His pulseThe effective volume of a cell body of the high-voltage impact-microorganism flocculation reaction cell is 270m3The working voltage of the driving motor is 380V, and the rotating speed of the microorganism flocculation stirring brush is 20 r/min.
In the pulse high-voltage electricity-microorganism flocculation reaction tank, the peak voltage of an underwater discharge electrode is 20kV, the pulse discharge frequency is 15-20 times/second, and the service life is longer than 3500 h.
The invention has the advantages that:
(1) the invention gets rid of the existing purification treatment principle of zinc ions in electroplating wastewater, creatively utilizes the microbial flocculation property of beer yeast and bacillus licheniformis, and the zinc ions in the wastewater are subjected to flocculation reaction on the surfaces of the microorganisms under a neutral condition through the zinc ion adsorption bridging property excited by the pulse high-voltage discharge process with a specific peak pressure value, so that flocs with larger diameters are gradually formed and are convenient to remove through a precipitation process.
(2) The invention innovatively designs a microorganism flocculation stirring brush attached with beer yeast and bacillus licheniformis strains, which is used as a surface contact reaction medium, so that zinc ions in wastewater can be fully contacted with the microorganism flocculation stirring brush, the flocculation reaction efficiency is improved, the treatment capacity of the whole system is improved, and the zinc ion removal efficiency of electroplating wastewater treated by the system can reach 97.7%.
(3) The invention adopts the beer yeast and the bacillus licheniformis as reaction materials, and both the two microorganisms do not have any harm to the environment.
(4) The invention has the advantages of simple and easy principle, lower design and construction cost, better treatment effect and low operation and maintenance cost, and is beneficial to large-scale popularization and application.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention.
In the figure: 1-water collecting well, 2-coarse grid, 3-primary sedimentation tank, 4-pH value adjusting tank, 5-pulse high-voltage electricity-microorganism flocculation reaction tank, 6-aeration oxidation tank, 7-biological denitrification tank, 8-secondary sedimentation tank and 9-water purifying tank
Fig. 2 is a schematic diagram of a pulsed high voltage electro-microbial flocculation reaction tank.
51-water inlet valve, 52-underwater discharge electrode, 53-light steel bracket, 54-driving rotating shaft, 55-microbial flocculation stirring brush, 56-driving motor, 57-water outlet valve, 58-electric mud pushing device and 59-mud discharge port.
Detailed Description
As shown in figure 1, the treatment method for removing zinc ions in electroplating wastewater, the electroplating wastewater containing zinc ions enters a water collecting well 1 through a wastewater pipeline, centralized collection and preliminary stable adjustment are carried out, the outlet of the water collecting well 1 is connected with a coarse grid 2 through the wastewater pipeline, large-diameter solid matters in the wastewater are removed, the outlet of the coarse grid 2 is connected with a primary sedimentation tank 3 through the wastewater pipeline, insoluble matters in the wastewater are further removed, the outlet of the primary sedimentation tank 3 is connected with a pH value adjusting tank 4 through the wastewater pipeline, the wastewater is precisely adjusted in pH value, the pH value of the outlet water of the pH value adjusting tank 4 is 6.5-8.0 so as to meet the requirement of the pH value of the inlet water of a pulse high-voltage electricity-microorganism flocculation reaction tank 5, the outlet of the pH value adjusting tank 4 is connected with the pulse high-voltage electricity-microorganism flocculation reaction tank 5 through the wastewater pipeline, the outlet of the pulse high-voltage electricity aeration-microorganism flocculation reaction tank 5 is connected with an oxidation tank 6 through a pipeline, the aerobic aeration process is adopted, so that various nitrogen-containing substances in the wastewater are converted into nitrate nitrogen, the outlet of the aeration oxidation tank 6 is connected with a biological denitrification tank 7 through a wastewater pipeline, the biological denitrification tank is used for decomposing and converting the nitrate nitrogen in the wastewater through a biological activity reaction process so as to remove the nitrate nitrogen, the outlet of the biological denitrification tank 7 is connected with a secondary sedimentation tank 8 through a wastewater pipeline, all residual insoluble substances in the wastewater are removed, the outlet of the secondary sedimentation tank 8 is connected with a water purification tank 9 through a wastewater pipeline, and the outlet of the water purification tank 9 discharges purified effluent treated by the system through a wastewater pipeline; wherein, the tank body of the pulse high-tension electricity-microorganism flocculation reaction tank 5 is made of stainless steel, and the effective volume of the tank body is 270m3The inner layer is sprayed with a corrosion-resistant coating, the middle parts of two sides of the tank body are respectively provided with 1 underwater discharge electrode 52, the peak voltage is 20kV, the pulse discharge frequency is 15-20 times/second, a light steel bracket 53 is arranged above the tank body, 3 sets of driving motors 56 are arranged on the light steel bracket, and the work efficiency of the driving motors 56 is improvedThe operating voltage is 380V, 1 driving rotating shaft 54 is connected below each set of driving motor 56, the tail end of each driving rotating shaft 54 is connected with 1 set of microorganism flocculation stirring brush 55 respectively, the rotating speed is 20 r/min, 1 electric mud pushing device 58 is installed at the left lower part of the tank body, a water inlet valve 51 is arranged above the electric mud pushing device, a water outlet valve 57 is arranged at the right upper part of the tank body, and a sludge discharge port 59 is arranged at the right lower part of the tank body; the electroplating wastewater after pH value adjustment treatment (the pH value after treatment is 6.5-8.0) enters the reaction tank through a water inlet valve 51 at the left lower part of a pulse high-voltage electricity-microorganism flocculation reaction tank 5, 3 sets of driving motors 56 at the top of the reaction tank start to work, 3 sets of microorganism flocculation stirring brushes 55 are driven by 3 driving rotating shafts 54 arranged below the reaction tank to start stirring movement with the frequency of 20 revolutions per minute in the wastewater, so that beer yeast and bacillus licheniformis strains attached to the microorganism flocculation stirring brushes 55 are fully contacted with the wastewater, meanwhile, underwater discharge electrodes 52 at the middle parts of the left side and the right side of the tank body start to perform high-voltage pulse discharge with the peak voltage of 20kV at the frequency of 15-20 times per second, the pulse high-voltage discharge process can excite the adsorption and bridging characteristics of the beer yeast and the bacillus licheniformis to zinc ions, so that the zinc ions in the wastewater generate flocculation reaction on the surfaces of the microorganisms, flocculate with larger diameter is gradually formed and finally settled at the bottom of the tank body according to the situation of sludge, the sludge is pushed by an electric sludge pushing device 58 at the left lower part of the tank body and is discharged out of the system through a sludge discharge port 59 for recycling treatment, and meanwhile, the wastewater after the flocculation purification treatment is discharged out of the reaction tank through a water outlet valve 57 at the right upper part of the tank body and enters the next treatment process.
The removal efficiency of zinc ions in the electroplating wastewater treated by the method can reach 97.7 percent.
Claims (2)
1. A treatment method for removing zinc ions in electroplating wastewater is characterized in that the electroplating wastewater containing the zinc ions enters a water collecting well through a wastewater pipeline, the outlet of the water collecting well is connected with a coarse grid through the wastewater pipeline, the outlet of the coarse grid is connected with a primary sedimentation tank through the wastewater pipeline, the outlet of the primary sedimentation tank is connected with a pH value adjusting tank through the wastewater pipeline, the outlet of the pH value adjusting tank is connected with a pulse high-voltage electricity-microorganism flocculation reaction tank through the wastewater pipeline, zinc-containing sludge discharged from a sludge discharge port of the pulse high-voltage electricity-microorganism flocculation reaction tank is recycled, meanwhile, the outlet of the pulse high-voltage electricity-microorganism flocculation reaction tank is connected with an aeration oxidation tank through the wastewater pipeline, the outlet of the aeration oxidation tank is connected with a biological denitrification tank through the wastewater pipeline, the outlet of the biological denitrification tank is connected with a secondary sedimentation tank through the wastewater pipeline, and the outlet of the secondary sedimentation tank is connected with a, the outlet of the water purifying tank discharges the purified effluent after treatment through a wastewater pipeline; the device comprises a pulse high-tension electricity-microorganism flocculation reaction tank, a water inlet valve, a water outlet valve, a sludge discharge port; the electroplating wastewater after pH value adjustment enters the reaction tank through a water inlet valve at the lower left part of a pulsed high-voltage electricity-microorganism flocculation reaction tank, 3 sets of driving motors at the top of the reaction tank start working, 3 sets of microorganism flocculation stirring brushes are driven by 3 driving rotating shafts arranged below the driving motors to start stirring motion in the wastewater, so that beer yeast and bacillus licheniformis strains attached to the microorganism flocculation stirring brushes are fully contacted with the wastewater, meanwhile, underwater discharge electrodes at the middle parts of the left side and the right side of the tank body start high-voltage pulse discharge, the pulse high-voltage discharge process can excite the adsorption bridging property of the beer yeast and the bacillus licheniformis to zinc ions, so that the zinc ions in the wastewater are subjected to flocculation reaction on the surfaces of the microorganisms to gradually form flocs with larger diameters, and finally the flocs are settled at the bottom of the tank body in the form of sludge, and the sludge is pushed by an electric sludge pushing device at the lower left part of the tank body, the wastewater is discharged out of the system through a sludge discharge port and is recycled, and meanwhile, the wastewater after flocculation purification treatment is discharged out of the reaction tank through a water outlet valve at the right upper part of the tank body and enters the next treatment process;
the pH value adjusting tank is used for adjusting the pH value of the wastewater subjected to primary precipitation to about 6.5-8.0 so as to meet the requirement of the pH value of inlet water of the pulse high-voltage electricity-microorganism flocculation reaction tank, the peak voltage of an underwater discharge electrode of the pulse high-voltage electricity-microorganism flocculation reaction tank is 20kV, the pulse discharge frequency is about 15-20 times/second, and the service life is longer than 3500 h.
2. The treatment method for removing zinc ions from electroplating wastewater according to claim 1, wherein the effective volume of the tank body of the pulse high-tension electricity-microorganism flocculation reaction tank is 270m3, the working voltage of the driving motor is 380V, and the rotating speed of the microorganism flocculation stirring brush is 20 r/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010807034.7A CN111747619A (en) | 2016-04-25 | 2016-04-25 | Treatment method for removing zinc in electroplating wastewater |
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| CN202010807034.7A CN111747619A (en) | 2016-04-25 | 2016-04-25 | Treatment method for removing zinc in electroplating wastewater |
| CN201610258874.6A CN105859026B (en) | 2016-04-25 | 2016-04-25 | Treatment method for removing zinc in electroplating wastewater |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103359803A (en) * | 2012-04-08 | 2013-10-23 | 西北农林科技大学 | Water treatment method and device for simultaneously removing heavy metal ions and organic pollutants from water |
| US20140083933A1 (en) * | 2011-05-04 | 2014-03-27 | Mike Young Shin | Method for heavy metal elimination or precious metal recovery using microbial fuel cell |
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2016
- 2016-04-25 CN CN202010807034.7A patent/CN111747619A/en not_active Withdrawn
- 2016-04-25 CN CN201610258874.6A patent/CN105859026B/en active Active
Patent Citations (4)
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| US20140083933A1 (en) * | 2011-05-04 | 2014-03-27 | Mike Young Shin | Method for heavy metal elimination or precious metal recovery using microbial fuel cell |
| CN103359803A (en) * | 2012-04-08 | 2013-10-23 | 西北农林科技大学 | Water treatment method and device for simultaneously removing heavy metal ions and organic pollutants from water |
| CN105174655A (en) * | 2015-10-20 | 2015-12-23 | 柴建中 | Treatment method of low-C/N ratio urban sewage |
| CN105417880A (en) * | 2015-12-22 | 2016-03-23 | 王尧尧 | Treatment method for removing COD (Chemical Oxygen Demand) in industrial wastewater |
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| 姜敏: "啤酒酵母和胶质芽孢杆菌对Cd2+、Zn2+吸附性及机理的研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
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| CN105859026B (en) | 2020-11-03 |
| CN105859026A (en) | 2016-08-17 |
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Application publication date: 20201009 |