CN107986571B - Treatment method of antimony-containing electroplating wastewater - Google Patents
Treatment method of antimony-containing 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
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
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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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- 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
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- 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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
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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
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- 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
Abstract
The invention discloses a method for treating antimony-containing 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 chitosan-biocatalysis adsorption and purification system, an aeration tank, a biological phosphorus removal tank, a secondary sedimentation tank and a water purifying tank. The invention creatively utilizes the rolling adsorption brush attached with chitosan and the sargassum thunbergii as a selective contact reaction medium, when antimony ions in the wastewater are fully contacted with the rolling adsorption brush, the chitosan and hydroxyl, carboxyl and acylamino on the molecular chain of the sargassum thunbergii can selectively carry out complexation reaction with the antimony ions, so that the antimony in the wastewater is efficiently adsorbed by the sargassum thunbergii, the sargassum thunbergii residues after adsorption reaction are brushed away by the fixed brush and naturally settled to gradually form sludge substances, and therefore, the antimony ions in the wastewater are removed. Meanwhile, the materials used by the system, namely chitosan and sargassum thunbergii, are low-cost and easily-obtained substances.
Description
Technical Field
The invention relates to a method for treating antimony-containing electroplating wastewater, belonging to the field of wastewater treatment in environmental protection.
Background
In recent years, antimony has been widely used in the non-ferrous metal industry, and the antimony-containing wastewater discharged from factories is a main pollution source of water antimony pollution. For example, the waste water discharged by industries such as smelting, printing, ceramics, lead-acid batteries, flame retardants, ore dressing, ore washing and the like has very high antimony content, and the pollution to water is particularly serious. In the electroplating industry, antimony oxide is often used as a base coating material for titanium electrodes, and antimony element gradually enters into water wastewater as electroplating progresses. A large amount of antimony enters the body, can stimulate and damage respiratory tract, digestive tract, creeping, lung and liver, can induce cancer and has great harm to human health. Therefore, the effective treatment of the antimony-containing wastewater is not slow, and the development of efficient and economic treatment research of the antimony-containing wastewater has great social, economic and environmental significance.
The prior common treatment methods for removing the antimony-containing wastewater comprise a chemical precipitation method, an electrolysis method, an adsorption method and an ion exchange method. (1) The chemical precipitation method is that sodium sulfide is first added into antimony-containing waste water to precipitate antimony, then polyferric sulfate is added to produce ferric sulfide and ferric hydroxide, and their coagulation and coprecipitation effects are utilized to remove waste waterAntimony in water. Although the method has the advantages of simple process, convenient operation, economy, practicality and the like, the sediment slag is difficult to treat and causes secondary pollution. (2) The electrolytic method is to use platinum group oxide or PbO2The method is used as an anode to destroy cyanide, and then antimony ions are flocculated, precipitated and filtered under the condition that the pH value is 11 to remove antimony, so that the method has high energy consumption, and cannot be generally applied to the treatment of antimony-containing wastewater. (3) The adsorption method is a method of removing antimony + in wastewater by adsorbing it on the surface of a solid adsorbent using a porous solid substance. The method has wide application range to the antimony-containing wastewater, does not cause secondary pollution, but has low adsorption selectivity of the adsorbent to antimony ions. (4) The ion exchange method has simple operation process, easy regeneration and good antimony removal effect. However, the method is limited by the adsorption capacity of the resin, is suitable for treating wastewater with low antimony concentration, and has the disadvantages of easy poisoning of the resin and high treatment cost.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a method for treating antimony-containing electroplating wastewater, wherein the antimony-containing electroplating wastewater enters a water collecting well through a wastewater pipeline, centralized collection and primary stable adjustment are carried out, an outlet of the water collecting well is connected with a coarse grid through the wastewater pipeline, large-diameter solid matters in industrial wastewater are removed, an outlet of the coarse grid is connected with a primary sedimentation tank through the wastewater pipeline, insoluble matters in the wastewater are further removed, an outlet of the primary sedimentation tank is connected with a pH value adjusting tank through the wastewater pipeline, the pH value range of the outlet water of the pH value adjusting tank is about 6.0-8.0 so as to meet the requirement of the pH value of inlet water of a chitosan-biocatalytic adsorption and purification system, an outlet of the pH value adjusting tank is connected with a chitosan-biocatalytic adsorption and purification system through the wastewater pipeline, sludge matters discharged by the chitosan-biocatalytic adsorption and purification system are transported outside, meanwhile, the outlet of the chitosan-biocatalytic adsorption purification system is connected with an aeration tank through a wastewater pipeline, various phosphorus-containing substances in wastewater are converted into orthophosphate through an aerobic aeration process, the outlet of the aeration tank is connected with a biological phosphorus removal tank through a wastewater pipeline, the function of the aeration tank is to decompose and convert the orthophosphate in the wastewater to remove the orthophosphate through a biological activity reaction process, the outlet of the biological phosphorus removal tank is connected with a secondary sedimentation tank through a wastewater pipeline, residual insoluble substances in the wastewater are completely removed, the outlet of the secondary sedimentation tank is connected with a water purification tank through a wastewater pipeline, and the outlet of the water purification tank discharges the purified effluent after treatment through the wastewater pipeline; the tank body of the chitosan-biocatalytic adsorption purification system is made of reinforced glass fiber reinforced plastic, a water inlet valve and a telescopic mud pusher are arranged below the left side of the tank body, a water outlet valve is arranged above the right side of the tank body, a sludge discharge port is arranged below the right side of the tank body, a light steel support is arranged at the upper part of the tank body, 3 groups of 9 atomizing spray heads are fixed on the light steel support, 3 sets of rolling adsorption brushes are fixed in the middle of the tank body, and 1 fixed brush is respectively arranged at the left side of each set of rolling adsorption brushes and is attached to the; industrial wastewater after pH value adjustment enters a purification system through a water inlet valve at the lower left side of a chitosan-biocatalytic adsorption purification system, 3 sets of rolling adsorption brushes positioned in the middle of a tank body start to roll clockwise, chitosan and sargassum thunbergii adhered to the rolling adsorption brushes are fully contacted with antimony ions in the wastewater, antimony in the wastewater is efficiently adsorbed by the sargassum thunbergii through selective complexation reaction of hydroxyl, carboxyl and acylamino on chains of the chitosan and sargassum thunbergii, sargassum thunbergii residues after adsorption reaction are brushed off by a fixed brush and naturally settle to the bottom of the tank to gradually form sludge substances, then the sludge substances are pushed by a telescopic mud pusher, the sludge is discharged out of the tank body through a sludge discharge port, meanwhile, clean rolling bristles brushed by the fixed brush continue to move clockwise to above the water surface, and an atomization nozzle sprays chitosan-sargassum thunbergii mixed liquid again, the rolling adsorption brush is regenerated and enters the water again through a clockwise motion path to start a new adsorption reaction process.
The effective volume of the tank body of the chitosan-biocatalytic adsorption purification system is 245m3The length of the rolling adsorption brush is 3.5m, the length of the brush hair is 10cm, the working voltage of the driving motor is 380V, and the rotation period is 180 s.
In the chitosan-biocatalysis adsorption purification system, the mass concentrations of chitosan and sargassum thunbergii in the chitosan-sargassum thunbergii mixed solution are respectively 60.0mg/L and 4.5 g/L.
The invention has the advantages that:
(1) the method gets rid of the inherent technical route of the prior antimony-containing electroplating wastewater treatment, creatively utilizes the selective adsorption characteristic of the sargassum thunbergii and the chitosan on metal ions, particularly antimony ions, and can exert remarkable adsorption and purification effects on the antimony-containing wastewater through efficient complexation reaction of the sargassum thunbergii and hydroxyl, carboxyl and acylamino on the molecular chain of the chitosan and the antimony ions in the wastewater, and the removal efficiency of the antimony ions can reach 99.5%.
(2) Compared with the prior method for treating the antimony-containing wastewater, the optimal application pH value range of the system is wider, and the requirement of the inlet water pH value of the system can be easily met only by a simple inlet water pH value adjusting means.
(3) The invention utilizes two common and cheap products of chitosan and sargassum thunbergii, greatly reduces the material cost in operation, and is very suitable for popularization and use in coastal economic and industrial developed areas.
(4) The method adopts the means that the chitosan and the sargassum thunbergii adsorb the antimony ions in the wastewater, and does not use any toxic chemical substance, thereby eliminating the risk of introducing new pollutants with greater harm.
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-chitosan-biocatalysis adsorption purification system, 6-aeration tank, 7-biological phosphorus removal tank, 8-secondary sedimentation tank and 9-water purification tank
FIG. 2 is a schematic diagram of a chitosan-biocatalytic adsorption purification system.
51-reinforced glass fiber reinforced plastic tank body, 52-light steel bracket, 53-atomizing spray head, 54-rolling adsorption brush, 55-fixed brush, 56-water inlet valve, 57-water outlet valve, 58-sludge discharge port and 59-telescopic mud pusher.
Detailed Description
As shown in figure 1, the treatment method for removing heavy metals in industrial wastewater comprises the steps that antimony-containing electroplating wastewater enters a water collecting well 1 through a wastewater pipeline, concentrated collection and primary stable regulation are carried out on the antimony-containing electroplating wastewater, and an outlet of the water collecting well 1 passes through the wastewater pipelineThe method comprises the steps of connecting a coarse grid 2, removing large-diameter solid matters in industrial wastewater, connecting an outlet of the coarse grid 2 with a primary sedimentation tank 3 through a wastewater pipeline, further removing insoluble matters in the wastewater, connecting an outlet 3 of the primary sedimentation tank with a pH value adjusting tank 4 through a wastewater pipeline, neutralizing the wastewater and accurately adjusting the pH value, wherein the pH value range of the outlet water of the pH value adjusting tank 4 is 6.0-8.0 so as to meet the requirement of the pH value of the inlet water of a chitosan-biocatalytic adsorption and purification system 5, connecting an outlet of the pH value adjusting tank 4 with the chitosan-biocatalytic adsorption and purification system 5 through a wastewater pipeline, externally treating sludge matters discharged from the chitosan-biocatalytic adsorption and purification system 5, simultaneously connecting an outlet of the chitosan-biocatalytic adsorption and purification system 5 with an aeration tank 6 through a wastewater pipeline, and performing an aerobic aeration process, the method comprises the following steps of converting various nitrogen-containing substances in the wastewater into nitrate nitrogen, connecting an outlet of an aeration tank 6 with a biological phosphorus removal tank 7 through a wastewater pipeline, wherein the biological phosphorus removal tank has the function of converting various phosphorus-containing substances in the wastewater into orthophosphate through a biological activity reaction process, connecting an outlet of the biological phosphorus removal tank 7 with a secondary sedimentation tank 8 through a wastewater pipeline, completely removing residual insoluble substances in the wastewater, connecting an outlet of the secondary sedimentation tank 8 with a water purification tank 9 through a wastewater pipeline, and discharging purified effluent treated by the system out of the water purification tank 9 through a wastewater pipeline; wherein, the tank body 51 of the chitosan-biocatalytic adsorption purification system 5 is made of reinforced glass fiber reinforced plastic, and the effective volume of the tank body is 245m3A water inlet valve 56 and a telescopic mud pusher 59 are arranged below the left side of the tank body, a water outlet valve 57 is arranged above the right side, a sludge discharge port 58 is arranged below the right side, a light steel bracket 52 is arranged at the upper part of the tank body, 3 groups of 9 atomizing spray heads 53 are fixed on the light steel bracket, 3 sets of rolling adsorption brushes 54 are fixed in the middle of the tank body, the length of each brush is 3.5m, the length of each brush is 10cm, the working voltage of a driving motor of the driving motor is 380V, the rotation period is 180s, and 1 fixed brush 55 is respectively arranged on the left side of each set of rolling adsorption brushes 54 and is attached to the rolling adsorption; the wastewater after pH value adjustment enters the purification system through a water inlet valve 56 at the lower left side of the chitosan-biocatalytic adsorption purification system 5, 3 sets of rolling adsorption brushes 54 positioned in the middle of the tank body start to roll clockwise, and chitosan and sargassum thunbergii attached to the rolling adsorption brushes and antimony in the wastewaterIons are fully contacted, antimony in the wastewater is efficiently adsorbed by the sargassum thunbergii through the complexation reaction between the chitosan and hydroxyl, carboxyl and amido on the sargassum thunbergii molecular chain selectively and antimony ions, the sargassum thunbergii residues after the adsorption reaction are brushed away by the fixed brush 55 and naturally settle to the bottom of the tank to gradually form sludge substances, then the sludge substances are pushed by the telescopic mud pusher 59 and discharged out of the tank body through the sludge discharge port 58, meanwhile, clean rolling bristles brushed away by the fixed brush 55 continuously move clockwise to above the water surface, and the chitosan-sargassum thunbergii mixed liquid is sprayed by the atomizing nozzle 53 again to ensure that the rolling adsorption brush 54 can regenerate and enter the water through the clockwise movement path again to start a new adsorption reaction process; the pH value adjusting tank 4 is used for adjusting the pH value of the wastewater subjected to primary precipitation to 6.8-7.2 so as to meet the requirement of the pH value of the inlet water of the chitosan-biocatalytic adsorption purification system 5; wherein, in the chitosan-sargassum thunbergii mixed solution, the mass concentration of the chitosan and the sargassum thunbergii are respectively 60.0mg/L and 4.5 g/L.
The antimony removal efficiency of the antimony-containing electroplating wastewater treated by the system can reach 99.5%.
Claims (1)
1. A method for treating antimony-containing electroplating wastewater is characterized in that the antimony-containing electroplating wastewater enters a water collecting well through a wastewater pipeline, centralized collection and primary stable adjustment are carried out, an outlet of the water collecting well is connected with a coarse grid through a wastewater pipeline, large-diameter solid matters in industrial wastewater are removed, an outlet of the coarse grid is connected with a primary sedimentation tank through a wastewater pipeline, insoluble matters in the wastewater are further removed, an outlet of the primary sedimentation tank is connected with a pH value adjusting tank through a wastewater pipeline, the pH value range of outlet water of the pH value adjusting tank is 6.0-8.0 so as to meet the requirement of the inlet pH value of a chitosan-biocatalytic adsorption purification system, an outlet of the pH value adjusting tank is connected with a chitosan-biocatalytic adsorption purification system through a wastewater pipeline, sludge matters discharged by the chitosan-biocatalytic adsorption purification system are transported outwards, and simultaneously, the outlet of the chitosan-biocatalytic adsorption purification system is connected with an aeration tank through a wastewater pipeline, various phosphorus-containing substances in the wastewater are converted into orthophosphate through an aerobic aeration process, and the outlet of the aeration tankThe outlet of the secondary sedimentation tank is connected with a water purification tank through a waste water pipeline, and the outlet of the water purification tank discharges the purified water after treatment through the waste water pipeline; wherein, the tank body of the chitosan-biocatalytic adsorption purification system is made of reinforced glass fiber reinforced plastic, and the effective volume of the tank body is 245m3A water inlet valve and a telescopic mud pusher are arranged below the left side of the tank body, a water outlet valve is arranged above the right side of the tank body, a sludge discharge port is arranged below the right side of the tank body, a light steel bracket is arranged at the upper part of the tank body, 3 groups of 9 atomizing spray heads are fixed on the light steel bracket, 3 sets of rolling adsorption brushes are fixed in the middle of the tank body, the length of each rolling adsorption brush is 3.5m, the length of each brush hair is 10cm, and 1 fixed brush is respectively arranged on the left side of each set of rolling adsorption brushes and is; industrial wastewater after pH value adjustment enters a purification system through a water inlet valve at the lower left side of a chitosan-biocatalytic adsorption purification system, 3 sets of rolling adsorption brushes positioned in the middle of a tank body start to roll clockwise, chitosan and sargassum thunbergii adhered to the rolling adsorption brushes are fully contacted with antimony ions in the wastewater, antimony in the wastewater is efficiently adsorbed by the sargassum thunbergii through selective complexation reaction of hydroxyl, carboxyl and acylamino on chains of the chitosan and sargassum thunbergii, sargassum thunbergii residues after adsorption reaction are brushed off by a fixed brush and naturally settle to the bottom of the tank to gradually form sludge substances, then the sludge substances are pushed by a telescopic mud pusher, the sludge is discharged out of the tank body through a sludge discharge port, meanwhile, clean rolling bristles brushed by the fixed brush continue to move clockwise to above the water surface, and an atomization nozzle sprays chitosan-sargassum thunbergii mixed liquid again, the mass concentrations of the chitosan and the sargassum thunbergii are respectively 60.0mg/L and 4.5g/L, so that the rolling adsorption brush can be regenerated and enters the water again through a clockwise motion path to start a new adsorption reaction process.
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| CN101186419B (en) * | 2007-12-25 | 2010-12-08 | 赵青海 | Method for treating electroplating mixed wastewater |
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Effective date of registration: 20200426 Address after: Room 295, Building C, 606 Ningliu Road, Changlu Street, Jiangbei New District, Nanjing City, Jiangsu Province, 210000 Applicant after: Nanjing Boyo Environmental Technology Co., Ltd. Address before: Room 2, unit 155, 401 Ma Ma Street, Shangcheng, 310012, Zhejiang, Hangzhou Applicant before: HANGZHOU QICHENG SCIENCE & TECHNOLOGY Co.,Ltd. |
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