Desulfurization wastewater treatment device

Abstract

The invention relates to a desulfurization wastewater treatment device which comprises a pH regulation area, a reaction area and a precipitation area, wherein the pH regulation area comprises an alkali regulation area and an acid regulation area independently arranged from each other; an upper water inlet is formed at one end of the alkali regulation area; a lower water outlet is formed on one side of the acid regulation area; a lower water inlet is formed on the other side of the acid regulation area; the alkali regulation area is communicated with the reaction area through a water outlet pipe; the reaction area is communicated with the precipitation area; and an outlet end of the precipitation area is communicated with the lower water inlet through a water outlet pipe of a precipitation tank. In the device provided by the invention, by adopting an integrated device and a high-load mixed-flow reaction unit, the volume of the reaction area is reduced; with a relatively large flocculation adsorption area, the treatment efficiency is improved, and the volume of the precipitation tank is reduced; and through a great quantity of sludge circulation, the reaction is more sufficient, and the drug is saved. The system is an efficient novel process integration device which is compact in structure and simple to control.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a treatment device for limestone-gypsum desulfurization wastewater, in particular to a desulfurization wastewater treatment device. Background technique [0002] With the rapid development of my country's energy industry and the construction of large-scale coal-fired power plants, fuel consumption continues to increase, SO 2 The amount of emissions is increasing, and the air pollution caused by it is becoming more and more serious. It is imminent to take desulfurization measures. SO 2 The control methods include desulfurization before combustion, desulfurization during combustion and desulfurization after combustion, namely flue gas desulfurization (FGD). At present, flue gas desulfurization is considered to control SO 2 The most effective means of emissions. The limestone-gypsum method is the most widely used and most mature desulfurization process in the world. The d...

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Problems solved by technology

Its disadvantages are: the hydraulic conditions of the three-box reactor with mechanical agitation are poor, and the reaction is uneven, resulting in the general design being too large and increasing the cost; the reaction time of the coagulant aid in the clarifier is too short, resulting in uneven settlement of alum flowers and separation of mud and water The effect is poor; in the case of pre-sedimentation, the sludge return flow is insufficient, and it is difficult to form effective flocculation adsorption in the system, and in the case of no pre-sedimentation, a large amount of suspended solids greatly increases the solid load of the system; the system is single The pipeline between bodies is complicated, and it is easy to form solid congestion

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