Desulphurization waste-water zero discharge processing system and technology

Abstract

A related desulphurization waste-water zero discharge processing system comprises a neutralization adjusting basin, a coagulation sedimentation basin and a flocculation sedimentation basin which are in successive connection. In the flocculation sedimentation basin, a supernatant formed in a specially-produced metering water channel flows into a supernatant processing device, and the lower dense liquid flows into a lower-dense-liquid processing device. The supernatant processing device comprises a full-automatic softening filter, an ultrafilter, a first-grade RO (reverse osmosis) device and a second-grade RO device; the outlet of the second-grade RO device is connected with a dense liquid tank and a pure water tank, pure water in the pure water tank is reusable, and a dense liquid in the dense liquid tank enters a crystallization evaporator for generating a salt. The lower-dense-liquid processing device discharges solid waste. Wastewater separated from a sewage concentration tank is discharged into the neutralization adjusting basin via a pipe for cyclic once-more processing. The technical scheme is combined with an advanced membrane technology, the technological flow is simple, energy-saving and environment-friendly, environment protection benefit is obviously increased, a new zero-discharge technology is realized, and the technical scheme possesses significant meaning on water pollution treatment.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, in particular to a zero-discharge treatment system and process for desulfurization wastewater. 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 is becoming more and more serious. It is imminent to take desulfurization measures. [0003] Today flue gas desulfurization is considered to control SO 2 The most effective way. The desulfurization wastewater produced by this wet flue gas desulfurization process contains a large amount of suspended solids (gypsum particles, SiO 2 , aluminum and iron hydroxides), active silicon, COD, chloride ions, fluoride ions, calcium ions, magnesium ions, high salt content and trace amounts of heavy metals, such as arsenic, cadmium, chromium, ...

AI Technical Summary

Problems solved by technology

The desulfurization wastewater produced by this wet flue gas desulfurization process contains a large amount of suspended solids (gypsum particles, SiO 2 , aluminum and iron hydroxides), active silicon, COD, chloride ions, fluoride ions, calcium ions, magnesium ions, high salt and trace heavy metals, such as arsenic, cadmium, chromium, mercury, etc., direct discharge will have a negative impact on the environment Cause serious harm, so the desulfurization wastewater must be treated before it can be discharged

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