Desulfurization waste water zero discharging process and system

Abstract

The invention discloses a desulfurization waste water zero discharging process. The process comprises a chemical dosing softening process and a microfiltration membrane treatment process; after incoming water is subjected to two-stage softening, nanofiltration and reverse osmosis separation are performed; sodium sulfate decahydrate with the purity of more than 99% is separated out by utilizing freezing crystallization; a reverse osmosis concentrated water regeneration sodium ion exchange device is utilized; sodium chloride with the purity of more than 98% is separated out by utilizing evaporative crystallization; solids are comprehensively utilized, and no liquid is discharged outside. The invention further provides a desulfurization waste water zero discharging system. According to the desulfurization waste water zero discharging process and the system, water in desulfurization waste water can be separated to be reutilized as domestic and industrial usable water, and other impurities in the desulfurization waste water are separated in solid form, so that pollutants harmful to the natural environment do not generate, and the problem that the desulfurization waste water pollutes the environment can be completely solved.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a zero-discharge process and system for desulfurization wastewater. Background technique [0002] my country is a country that uses coal as the main energy source, and coal-fired power generation is one of the most important ways of coal utilization in my country. According to my country's national conditions, coal-fired power generation will still dominate in the 21st century. Among the many air pollutants emitted by coal-fired thermal power units, SO 2 And the dust is more harmful to the environment and is the main pollutant to be controlled. With the progress of society and the development of economy, the pollution of thermal power plants to the atmospheric environment has been widely concerned by people. Therefore, it is a severe challenge for the sustainable development of my country's energy field to effectively reduce pollutant emissions and reduce the impa...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a zero-discharge process and system for desulfurization wastewater, which can reduce the pollution of desulfurization wastewater to the environment, separate the water from it for reuse, and separate the remaining impurities in the form of solids to achieve pollution. Zero discharge of pollutants, completely solve the problem of environmental pollution caused by desulfurization wastewater

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