System and method for cooperatively removing mercury with desulfurization waste water

Abstract

The invention discloses a system and a method for cooperatively removing mercury with desulfurization waste water. The system comprises a sulfur removal tower, an impurity removal system, a concentration device, an electrolysis device and an alkaline liquor storage device. The method comprises the following steps: removing impurity ions of SO4<2->, magnesium ions, calcium ions and the like of the desulfurization waste water; deeply purifying and concentrating the desulfurization waste water with impurity ion removed; electrolyzing concentrated desulfurization waste water; introducing a chlorine gas produced by electrolysis into a flue of a desulfurization tower to oxide a mercury single substance, thereby removing the mercury in the smoke gas. According to the system and the method disclosed by the invention, the problem that the outlet water of a conventional desulfurization waste water treatment process is high in salt content is solved, efficient cooperative mercury removal can be realized, and Cl2 and NaOH solutions and a clean energy source H2 which are extensively applied can be obtained.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a system and method for synergistic mercury removal of desulfurization wastewater. Background technique [0002] my country is the world's largest coal producer and consumer. In 2013, my country's coal production and consumption accounted for 47.4% and 50.3% of the world's total respectively. For a long time, coal has accounted for more than 70% of my country's primary energy structure. As a result, my country's SO emissions 2 About 90% comes from burning coal. A large amount of SO emitted from coal combustion 2 It has caused great harm to crops, forests, buildings and human health. Our country suffers from SO every year 2 The economic losses caused by the emissions amounted to hundreds of billions of yuan. [0003] Limestone-gypsum flue gas desulfurization technology (WFGD) has become the most widely used flue gas in the world at this stage due to its...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a system and method for synergistic demercury removal of desulfurization wastewater, which solves the problem that the existing desulfurization wastewater treatment process cannot effectively remove chloride ions in wastewater, resulting in high salt content in wastewater, which cannot be recycled or discharged. , and can achieve efficient and coordinated mercury removal in existing wet desulfurization units

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