Desulfurization wastewater treatment system and desulfurization wastewater treatment method

Abstract

The present invention discloses a desulfurization wastewater treatment system and a desulfurization wastewater treatment method. The desulfurization wastewater treatment system comprises: a wastewater buffer pool, wherein the water inlet is connected with the outlet of an apparatus for producing desulfurization wastewater; a sludge pressing device, wherein the input end and the water outlet of the wastewater buffer pool are connected; a multi-stage treatment pool, wherein the water inlet is connected with the water outlet of the sludge pressing device; a clarification pool, wherein the water inlet is connected with the water outlet of the multi-stage treatment pool; and a pH value re-adjusting box, wherein the water inlet is connected with the clear water outlet on the upper portion of the clarification pool. The invention further provides a wastewater treatment method adopting the system. According to the present invention, the wastewater treatment method is particularly suitable for pellet flue gas wet desulphurization wastewater, the process is simple, the solid content in the system is low, the operating cost is reduced while the desulfurization by-product gypsum and the slow-release fertilizer can be recycled, and the final effluent meets the national discharge standard.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a desulfurization waste water treatment system and method, which are especially suitable for waste water produced by wet desulfurization of pellet flue gas. Background technique [0002] It has been found through research that the emission of sulfide is mainly related to coal-fired power plants and the steel industry. The application of pellet flue gas desulfurization technology is the main means of controlling sulfide emission in the steel industry. 2 ) important way of emissions. At present, most of the domestic large-scale steel mills increase the desulfurization process and desulfurize the pellet machine to reduce SO 2 emissions. However, my country's large iron and steel enterprises have paid more and more attention to the research of pelletizing flue gas desulfurization technology, and flue gas desulfurization has become an indispensable and important part of pelletiz...

AI Technical Summary

Problems solved by technology

[0006] (3) High ammonia nitrogen content, 900-1700mg / l;

There are a lot of deficiencies in this desulfurization wastewater treatment process: First, a large amount of gypsum enters the process of sludge discharge, which reduces the utilization of gypsum recyclable resources and increases the solid load and failure rate of the wastewater treatment system, thus affecting The normal operation of the system; secondly, in the process of desulfurization wastewater treatment, there are many kinds of chemicals that need to be added and the dosage is large, which increases the cost of adding chemicals, but will also affect the quality of the wastewater effluent and increase the operating cost; thirdly, the sedimentation in the clarification tank The gypsum that can be recycled in the concentrated solution at the bottom of the pool can only be transported to landfill due to the addition of a large amount of chemicals, resulting in a waste of resources

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