Desulfurization wastewater treatment method

Abstract

The invention relates to sewage treatment, and discloses a desulfurization wastewater treatment method. In the present invention, the organic sulfur in the reaction box and the coagulant in the flocculation box are disabled. The coagulation aid is directly added to the desulfurization wastewater adjusted by the pH value. At the same time, the dosing port and dosing position are adjusted. The dispersed suspended particles in the desulfurization wastewater are condensed into larger flocs. After passing through the clarification and concentration tank, impurities such as heavy metals in the wastewater are deposited at the bottom of the tank, and the upper layer of clear water overflows to the neutralization tank. Further, stop using sodium hypochlorite and hydrochloric acid in the neutralization box, move the dosing point of sodium hydroxide from the pH adjustment box to the reduction box, and move the dosing point of the coagulant from the flocculation box to the reaction box to Reduce the types of chemicals that need to be added in the treatment of desulfurization wastewater, reduce the complexity of dosing, avoid affecting the effluent quality of desulfurization wastewater due to excessive dosing, and also reduce the cost of dosing.

Description

technical field [0001] The invention relates to sewage treatment, in particular to the treatment technology of desulfurization wastewater. Background technique [0002] The desulfurization wastewater treatment system is mainly used to treat the desulfurization wastewater discharged from the overflow of the wastewater cyclone into the wastewater storage tank. The impurities contained in the desulfurization wastewater are mainly suspended solids, supersaturated sulfite, sulfate and heavy metals. [0003] The current desulfurization wastewater treatment process is as follows: figure 1 As shown, the desulfurization wastewater is transported to the reduction tank through the wastewater pump, and flows into the pH adjustment tank through the reduction tank. Sodium hydroxide is added to the pH adjustment tank. The function of sodium hydroxide is to increase the pH of wastewater, produce heavy metal precipitation, and remove of heavy metals. Part of the heavy metals are removed by...

AI Technical Summary

Problems solved by technology

[0004] However, the inventors of the present invention have found that in the whole desulfurization wastewater treatment process, it is necessary to use six medicines including sodium hydroxide, organic sulfur, coagulant, coagulant aid, sodium hypochlorite, and hydrochloric acid, and the dosing process is complicated. There are many kinds of medicines, which also lead to high dosing costs, and excessive dosing may affect the quality of desulfurization wastewater effluent

In addition, uneven dosing is also likely to affect the flocculation effect, thereby affecting the quality of effluent water

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