Coal-fired power plant desulfurization wastewater resource treatment system and coal-fired power plant desulfurization wastewater resource treatment method

Abstract

The invention discloses a coal-fired power plant desulfurization wastewater resource treatment system and a coal-fired power plant desulfurization wastewater resource treatment method. The system comprises a concentration electrolysis three-chamber reactor, a desulfurization system, a pre-sedimentation tank, a magnesium resource reaction clarification tank, a heavy metal reaction clarification tank, a sulfate radical deep removal reaction clarification tank, a neutralization tank, an ultrafiltration system, a nanofiltration system, a reverse osmosis system, a calcium hydroxide feeding system,a coagulant and coagulant aid mixed feeding system, a sulfate radical composite precipitator feeding system and a hydrochloric acid feeding system, wherein an electrodialysis cathode, an electrolysisinert electrode cathode, an electrodialysis anode membrane, an electrodialysis cathode membrane, an electrolysis inert electrode anode and an electrodialysis anode are sequentially arranged in the concentration electrolysis three-chamber reactor. With the system and the method, the investment cost and the operation cost can be reduced, and the resource acid production and alkali production of desulfurization wastewater can be achieved.

Description

technical field [0001] The invention relates to a desulfurization wastewater treatment system and method, in particular to a coal-fired power plant desulfurization wastewater resource treatment system and method. Background technique [0002] The water quality of desulfurization wastewater from coal-fired power plants is characterized by high concentrations of suspended solids, chloride ions, sulfate radicals, calcium ions and magnesium ions, as well as certain concentrations of heavy metals. At present, desulfurization wastewater treatment technologies include: ①The traditional "three-box" standard treatment process, so that the water quality of the discharge outlet of the workshop meets the requirements of the "Water Quality Control Index for Limestone-Gypsum Wet Desulfurization Wastewater in Thermal Power Plants" (DL / T997-2006); ② The processes of "pretreatment-evaporation crystallization", "pretreatment-concentration-evaporation crystallization", "pretreatment-flue gas e...

AI Technical Summary

Problems solved by technology

At present, desulfurization wastewater treatment technologies include: ①The traditional "three-box" standard treatment process, so that the effluent water quality of the workshop discharge outlet meets the requirements of the "Water Quality Control Index for Limestone-Gypsum Wet Desulfurization Wastewater in Thermal Power Plants" (DL / T997-2006); ② The processes of "pretreatment-evaporation crystallization", "pretreatment-concentration-evaporation crystallization", "pretreatment-flue gas evaporation" and "pretreatment-concentration-flue gas evaporation" are currently being promoted in coal-fired power plants to achieve the reduction of salt in desulfurization wastewater The water is precipitated in the form of crystalline salt to achieve zero discharge, but these processes have problems of high investment and operating costs, and the evaporation and crystallization process has the problem of crystalline salt disposal, and the flue gas evaporation process has risks such as crystalline salt affecting the comprehensive utilization of ash.

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