Electrochemical oxidation device for treating desulfurized wastewater

Abstract

The invention relates to an electrochemical oxidation device for treating desulfurized wastewater. The device comprises: a pre-treatment system, an electrochemical reaction system, an adsorption system and an electric control system. The pre-treatment system comprises: a sand filter and a conveying pump. The electrochemical reaction system comprises: an electrode plate, a reaction groove body, a reaction storage tank and a liquid level meter. The adsorption system comprises: a stone coal active carbon adsorption device, a coconut shell active carbon adsorption device and a peat active carbon adsorption device. The electric control system comprises: a liquid level meter, a solenoid valve, a flow meter, a conductivity meter, a pH (Potential of Hydrogen) meter and an electric control cabinet body. The electrochemical oxidation device for treating the desulfurized wastewater is used in the fields of power plants and treatment of the produced desulfurized wastewater, and has the advantages of land saving, integrated design, relatively high automation degree and simplicity in operation.

Description

technical field [0001] The invention relates to the field of desulfurization wastewater treatment, in particular to a device for treating desulfurization wastewater in power plants. Background technique [0002] The waste water generated in the process of boiler flue gas wet desulfurization (limestone / gypsum method) comes from the discharge water of the absorption tower. In order to maintain the balance of substances in the slurry circulation system of the desulfurization unit, prevent the soluble part of the flue gas, that is, the chlorine concentration from exceeding the specified value, and ensure the quality of gypsum, a certain amount of wastewater must be discharged from the system. The wastewater mainly comes from the gypsum dehydration and cleaning system. The impurities contained in wastewater mainly include suspended solids, supersaturated sulfite, sulfate and heavy metals, many of which are the first category of pollutants that are strictly controlled in the natio...

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Problems solved by technology

[0003] At present, the treatment of desulfurization wastewater is generally through chemical precipitation, because the water contains heavy metals, most of the suspended solids are not easy to flocculate and precipitate, high concentration of chloride ions, high salt content, etc., the salt content of the treated effluent is very high, at pH A large amount of alkali is consumed during the adjustment process, and a large amount of industrial sludge is produced in the subsequent flocculation and precipitation. The material consumption is large and the treated wastewater is directly discharged, which is likely to cause secondary pollution; the evaporation and crystallization method neutralizes the desulfurization wastewater and adds a flocculant. Flocculation and sedimentation, the effluent is softened by lime and enters the filter

The filtered water is further concentrated by reverse osmosis membrane equipment, and then crystallized and evaporated by a multi-effect evaporator to extract the salt in the water. This method produces a large amount of sludge, high operating costs, large equipment footprint, and unstable operation.

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