A desulfurization wastewater treatment system and method

Abstract

The invention discloses a desulfurization wastewater treatment system and method. The wastewater treatment system comprises: a wastewater buffer tank, the water inlet of which is connected to the outlet of a device producing desulfurization wastewater; sludge squeezing equipment, the input end of which is connected to the outlet of the wastewater buffer tank Connection; multi-stage treatment tank, the water inlet is connected to the water outlet of the sludge squeezing equipment; the clarification tank, the water inlet is connected to the water outlet of the multi-stage treatment tank; pH callback box, the water inlet is connected to the upper clear water of the clarification tank At the same time, it also provides a wastewater treatment method using the above system. This treatment method is especially suitable for pelletizing flue gas wet desulfurization wastewater. The process is simple and the system has a low solid content. The products are gypsum and slow-release compound fertilizer, and the final wastewater discharge meets national standards.

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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