Desulfurization wastewater treatment process

Abstract

The invention provides a desulfurization wastewater treatment process, comprising the following steps: 1) water quality adjustment tank; 2) precipitation reaction tank; 3) sedimentation tank; 4) defluorination reaction tank; 5) clarification tank; 6) neutralization tank; 7) Membrane treatment unit; 8) Discharge tank. The invention effectively removes reducing substances (COD), hexavalent chromium, fluorine ions and the like in waste water. Taking the desulfurization wastewater treatment of a power plant as an example, through the comprehensive application of neutralization and reduction processes, the effluent indicators in actual operation are lower than 100mg / L COD, hexavalent chromium is lower than 0.5 mg / L, and fluoride ion is lower than 10 mg / L. The processing process is simple and efficient, and the operation is highly automated. The desulfurization wastewater treatment capacity has reached and exceeded the design capacity.

Description

Technical field [0001] The invention belongs to the field of water treatment, and specifically relates to a desulfurization wastewater treatment process. Background technique [0002] The impurities in the desulfurization wastewater of thermal power plants come from the flue gas and limestone used for desulfurization, mainly including suspended solids, supersaturated sulfites, sulfates and heavy metals: many of them are the first type of pollutants required to be controlled in the national environmental protection standards due to water quality Due to its particularity, it is difficult to treat desulfurization wastewater; at the same time, because various heavy metal ions have a strong environmental pollution, the desulfurization wastewater must be treated separately. [0003] There are many types of treatment methods for desulfurization wastewater from power plants in my country, which can be divided into two types: [0004] a. High-concentration desulfurization wastewater is spray...

AI Technical Summary

Problems solved by technology

[0004] a. High-concentration desulfurization wastewater is sprayed into the slag, and the heavy metals and salts in the desulfurization wastewater are absorbed by the slag to reduce the concentration of heavy metals and chloride salts in the solution. The practical conclusion tells us that this method does have certain effects, but heavy metals , The content of chlorine salt is still very high. When the solution is reused again, it often causes the nozzle of the spray device to be blocked (the salt content is too high, the evaporation and crystallization are too fast, causing blockage)

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