Process for treating chemical fluorine-containing wastewater by combining micro-electrolysis, Fenton and lime coagulation

Abstract

The invention discloses a process for treating chemical fluorine-containing wastewater by combining micro-electrolysis, Fenton and lime coagulation. The process comprises an iron-carbon-Fenton combined experiment and a lime defluorination coagulation experiment, wherein the iron-carbon-Fenton combined experiment comprises an iron-carbon micro-electrolysis experiment and a Fenton oxidation experiment carried out on the basis of iron-carbon micro-electrolysis; the influence of different pH values, reaction time, aeration rate and filler dosage on the CODcr removal effect is studied by the iron-carbon micro-electrolysis experiment, and the CODcr removal effect is studied by different H2O2 dosage, pH and reaction time by the Fenton oxidation experiment; the lime defluorination coagulation experiment comprises the steps: performing lime method defluorination on water subjected to iron-carbon micro-electrolysis defluorination, wherein the F<-> removal effect is achieved by different additionamounts and reaction time; because the lime method defluorination precipitation is fine and the precipitation speed is slow, the influence of different pH values, PAC addition amounts and PAM addition amounts on the removal effect needs to be studied in cooperation with coagulation reaction defluorination and coagulation experiment parts. Under the optimal process conditions, the comprehensive removal rate of COD can reach 88.7%, and the comprehensive removal rate of F<-> can reach 99%.

Description

technical field [0001] The invention belongs to the technical field of chemical fluorine-containing wastewater treatment, and in particular relates to a micro-electrolysis-Fenton-lime coagulation combined process for treating chemical fluorine-containing wastewater. Background technique [0002] For a long time, the production capacity of fluorine-containing polymer materials in the world has grown rapidly and simultaneously with consumer demand. A large amount of fluorine-containing organic wastewater is produced in the production process of fluorine chemical products. The composition of pollutants in chemical fluorine-containing organic wastewater is complex, and the water quality and quantity vary greatly. The concentration of harmful pollutants is high, the chroma is high, and the biodegradability is low. It is a kind of wastewater that is difficult to treat in industry. The characteristics of fluorine chemical production wastewater in my country are that there are many ...

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Problems solved by technology

Among them, the chemical precipitation method is widely used in industry, but the treatment depth is not enough, and it is difficult to meet the standard. The rest of the methods are only in the laboratory for exploration and research because they have n

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