Advanced treatment method for arsenic-containing wastewater
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A waste water and concentration technology, applied in water/sewage multi-stage treatment, oxidized water/sewage treatment, water/sludge/sewage treatment, etc., can solve complex regeneration and desorption process, secondary pollution of extractant, generated sewage Large amount of mud and other problems, to achieve the effect of increasing arsenic removal efficiency, shortening settling time, and high arsenic removal efficiency
Inactive Publication Date: 2013-04-17
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Among them, the extraction method has the problem of secondary pollution from the residual extractant; the regeneration and desorption process of the ion exchange and adsorption methods are complex, the cost is high, and it is difficult to apply on a large scale; the iron salt precipitation method is relatively simple in process and has better practical application effect
Chinese patent (authorization number: CN1100008C) proposes a method for the harmless treatment of arsenic-containing wastewater by oxidation-calcium salt precipitation-iron salt flocculation precipitation. The separation time is long, and a large amount of slud
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Embodiment 1
[0014] The method of the invention treats 1L of prepared wastewater containing 1mg / L of trivalent arsenic.
[0015] Introduce 5mg / L ozone into the reaction tank, stir for 5min, then add 150mg / L 10% ferric chloride solution, and add sodium hydroxide to adjust pH=8, stir rapidly for 0.1min, then add 0.1mg / L 0.1 % polyacrylamide solution, stirred rapidly for 0.1min, stirred slowly for 5min, and settled for 10min. After the sludge was separated, the supernatant was filtered in a sand filter. The As content of the treated wastewater was 0.008 mg / L, the Fe content was 0.02 mg / L, and the pH was 7.5.
Embodiment 2
[0017] The method of the invention treats 10L of prepared wastewater containing 10mg / L of trivalent arsenic.
[0018] Introduce 100ml / min air into the reaction tank, stir and react for 60min, then add 500mg / L 1% polyferric sulfate solution, and add calcium oxide to adjust pH=6, stir rapidly for 1min, then add 1mg / L 0.1% polyferric sulfate solution For acrylamide solution, stir rapidly for 1 minute, stir slowly for 10 minutes, settle for 30 minutes, and after the sludge is separated, filter the supernatant through a membrane filter. The As content of the treated wastewater was 0.009 mg / L, the Fe content was 0.01 mg / L, and the pH was 6.8.
Embodiment 3
[0020] The method of the invention treats 100L of prepared wastewater containing 100mg / L of trivalent arsenic.
[0021] Add 100mg / L hydrogen peroxide into the reaction tank, stir for 10min, then add 1000mg / L10% polyferric sulfate solution, add sodium carbonate to adjust pH=7, stir rapidly for 1min, then add 10mg / L 0.1% polyferric sulfate solution For the acrylamide solution, stir rapidly for 1 minute, stir slowly for 10 minutes, and settle for 30 minutes. After the sludge is separated, the supernatant enters the filter bag for filtration. The As content of the treated wastewater was 0.005 mg / L, the Fe content was 0.01 mg / L, and the pH was 6.8.
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Abstract
The invention relates to a method for treating arsenic-containing wastewater by a process of preoxidation-composite coagulation deposition-filtering, and belongs to the technical field of wastewater treatment. The method comprises the steps of adding a certain amount of an oxidizing agent in a reaction tank for preoxidation in a condition that the wastewater contains trivalent arsenic so as to transform the trivalent arsenic into pentavalent arsenic completely, while for the wastewater only contains the pentavalent arsenic, the preoxidation process is not needed; adding a certain amount of a ferrous salt water solution; controlling a molar ration of Fe to As being 5-50; adding acid or alkali to adjust a pH value being 6-8; stirring for 0.1-1 min rapidly, so that a ferric arsenate precipitate is formed, at the same time, the ferrous salt is hydrolyzed into ferrous carbonyl to promote coagulation deposition of the ferric arsenate; adding a solution of 0.1-10 mg/L organic polymer flocculant; stirring for 0.1-1 min rapidly; stirring for 5-10 min slowly, precipitating for 10-30 min, discharging sludge from the bottom, introducing supernatant into a sand filter tank, a filter film or a filter bag, filtering and discharging the effluent. Arsenic content in water after treatment is lower than that of a drinking water standard (less than 10 [mu]g/L) regulated by the world health organization. The method has low sludge production and low cost, and can be used for advanced treatment of the arsenic-containing industrial wastewater and treatment of arsenic polluted underground water and drinking water.
Description
technical field [0001] The invention relates to an advanced treatment method for arsenic-containing wastewater and arsenic-contaminated groundwater or drinking water, in particular to a new pre-oxidation-composite coagulation sedimentation-filtration method applied to the advanced treatment of arsenic-containing wastewater. Background technique [0002] Arsenic and its compounds are highly toxic, among which trivalent arsenic is more toxic than pentavalent arsenic, and has been identified as a first-class carcinogen by the International Agency for Anti-Cancer Research. Arsenic pollution mainly comes from waste water and waste residues produced by mining, metallurgy, chemical industry, chemical pharmaceuticals, pesticide production, glass processing, and tanning industries. Because arsenic is mainly harmful to human health through drinking water, countries such as Europe, America, Japan and China have listed arsenic as one of the priority water pollutants for control. The U....
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