Process for treating arsenic-containing wastewater
A waste water and process technology, applied in the direction of filtration treatment, sedimentation treatment, water/sewage treatment, etc., can solve the problems of low chemical utilization rate, low production efficiency, unstable effect, etc., to improve resource utilization rate, convenient operation, and pharmaceutical Effects with few types
Inactive Publication Date: 2019-10-08
BAIYIN NONFERROUS GROUP
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[0012] In order to better protect the environment, the present invention provides an economical, efficient and stable arsenic-containing wastewater for the above-mentioned chemical precipitation method to treat the arsenic-containing wastewater, with the defects of low chemical utilization rate, unstable effect, high cost and low production efficiency. Wastewater Treatment Process
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[0037] First, 300m³ of arsenic-containing wastewater, mg / L: Cu:1500, As:7000, Fe:150, Zn:1500, F:300, H 2 SO 4 :60000, SS:100, and lime solution (Ca(OH) 2 ) in the neutralization tank. When the pH of the mixed solution is 10.5 after the reaction is complete, put the mixed solution into the oxidation tank, stir and aerate the tank to make it fully oxidized, and pour it into the intermediate tank. The solution in the intermediate tank is filtered Machine and other filtration equipment, filter residue is transported to the waste residue yard, filtered liquid, mg / L: Cu:50, As:350, Fe:20, Zn:50, F:50, H 2 SO 4 : 0, SS: 80, pour the filtered liquid into 1# reaction tank continuously, add hydrogen peroxide and iron salt in 1# reaction tank, under normal conditions, iron salt is about 350kg / d, hydrogen peroxide is about 150kg / d, normal In the case of =1:1, that is, when the arsenic content is X mg / L, the amount of iron salt added is X kg / d, and the amount of hydrogen peroxide added...
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The invention provides a process for treating arsenic-containing wastewater. The process includes removing arsenic by a 'hydrogen peroxide plus iron salt' method, adding lime to the wastewater to increase the pH, reacting calcium ions with the arsenic in the wastewater to generate precipitates of calcium arsenite and calcium arsenate, and performing sedimentation and filtration to remove the arsenic; adding ferrite and hydrogen peroxide to obtained filter liquor, performing sufficient aeration and oxidation by compressed air, oxidizing Fe2+ in the wastewater into Fe3+, oxidizing As3+ into As5+, generating precipitates of calcium / ferric arsenate and calcium / ferric arsenite, and removing the arsenic through filtration to meet emission standards. The process, in which the arsenic-containing wastewater is treated by a lime-iron salt method, has the advantages of few type of feed drugs, high sedimentation efficiency, stable and up-to-standard wastewater discharge, low operating cost, convenience in operation and the like, and is widely applied.
Description
technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a process for treating arsenic-containing wastewater. Background technique [0002] Arsenic is widely distributed in nature and has metal-like properties. Its products are mainly used in wood preservatives, glass enamel industry, pesticides, alloy materials, medicine, feed chemical industry and other fields, especially in medicine and alloy materials. However, arsenic is mostly associated with other minerals (such as non-ferrous metal minerals). Due to natural release and artificial development, especially the large-scale mining and use of lean ore, a large amount of arsenic is developed along with the main elements and enters the environment during the production process. Wastewater discharged from industrial fields such as mining, non-ferrous metal smelting, sulfuric acid preparation, chemical dyes and pesticide production often contains high concentrat...
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Login to View More IPC IPC(8): C02F9/04C02F101/10
CPCC02F1/001C02F1/58C02F1/66C02F1/722C02F1/74C02F9/00C02F2001/007C02F2101/103
Inventor 冯治兵刘永龙寇安民郭庆民
Owner BAIYIN NONFERROUS GROUP