Research progress on selenium removal of FGD wastewater from coal-fired power plants

doi:10.16085/j.issn.1000-6613.2017.04.040

Abstract

Abstract: The wastewater resulting from wet flue gas desulfurization(FGD) in coal-fired power plants enriches selenium which will destroy the surrounding environment and cause the endemic diseases. This paper provided an overview of existing technologies of selenium removal and their application in FGD wastewater treatment field,summarized advantages and disadvantages of each technology,and also pointed out their application prospects. The related literatures,patents and cases of each method were counted briefly. The effective methods(chemical reduction,membrane separation process,biological process,coagulation process,ion exchange resin and adsorption) were mentioned respectively. The pH and co-existing anions in aqueous solution appeared to have a significant impact on removal efficiency. The coagulation and biological combined processes were proved to be the most applicative technology by analysis and comparison. The lack of emission standard and technology research of selenium in FGD wastewater were the current characteristics of the domestic coal-fired industry. Considering the cost and operation,coagulation process may be the most economical and feasible method of selenium removal for the domestic situation in the near future.

Key words: coal-fired power plant, desulfurization wastewater, selenium removal

摘要： 燃煤电厂烟气经过湿法脱硫处理后产生的废水会富集硒元素，破坏周边生态环境并导致地方病的发生。本文对现有的国内外脱硒技术及其在脱硫废水中的应用进行了综述，对比分析了各种技术的优缺点及在脱硫废水处理领域的应用前景，统计了各种方法的相关文献、专利及案例情况。总结得出现有脱硒效率较高的技术主要包括化学还原法、膜分离技术、生物处理法、絮凝沉淀法、离子交换树脂及吸附法，缺点是易受到pH和水中其它阴离子的干扰。分析表明，絮凝+生物联合处理技术是最具有实用前景的工艺。就目前国内形势而言，脱硫废水硒排放标准缺失，相关技术研究不足，综合考虑实际运行情况及处理成本等因素，絮凝沉淀法会是符合国内现状的一种行之有效的脱硒方法。

关键词: 燃煤电厂, 脱硫废水, 硒元素脱除

CLC Number:

TM621.8

ZHANG Shenghan, SUN Chenhao, CHEN Yuqiang. Research progress on selenium removal of FGD wastewater from coal-fired power plants[J]. Chemical Industry and Engineering Progress, 2017, 36(04): 1460-1469.

张胜寒, 孙晨皓, 陈玉强. 燃煤电厂脱硫废水中硒元素脱除技术研究进展[J]. 化工进展, 2017, 36(04): 1460-1469.

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