美国电厂石灰石—石膏湿法脱硫废水硒污染治理及对中国的启示  

The US power plant wet limestone FGD selenium wastewater treatment control and its implications for China

作　　者：兰春锋 苏清发 吴慕正 

机构地区：[1]福建龙净脱硫脱硝工程有限公司,福建厦门361000

出　　处：《电力科技与环保》2013年第1期59-62,共4页Electric Power Technology and Environmental Protection

基　　金：科技部国际合作资助项目(2010DFB93990)

摘　　要：近些年在美国石灰石—石膏湿法脱硫废水污染出现问题主要与硒(Se)有关。在湿法脱硫的强力氧化下,低溶解度+4价亚硒酸钙(CaSeO3)被氧化成高溶解度+6价硒酸钙(CaSeO4)富集在脱硫废水中,使传统物理化学法处理后的废水硒排放难以达标,必须再用生物技术或人工湿地将废水中硒酸钙还原成低价硒沉淀处理,此外干法脱硫也己被用作替代石灰石—石膏湿法脱硫处理硒排放。我国是燃煤高硒国家,但对石灰石石膏湿法脱硫废水产生的硒污染问题相对缺乏认识,美国对硒污染的治理经验可作为国内湿法脱硫废水硒污染处理的借鉴。In recent years,selenium treatment in wet limestone FGD wastewater is a major problem in the United States. During the forced oxidation,the nearly insoluble ＋ 4 selenite （as CaSeO3） can be oxidized to much more soluble ＋ 6 selenate （ as CaSeO4 ）, presented in wastewater. This makes it difficult to treat wastewater with the commercially available physical and chemical processes and to meet the selenium discharge standards. It is generally required to use more expensive and complicated biological processes and wetland to reduce and precipitate selenium from wastewater for treatment. Dry FGD has been used as an alternative to wet limestone FGD for selenium discharge treatment. Although coal in China contains higher average selenium content,there are few reports focused on selenium treatment of wet limestone FGD wastewater. The experience in the US could provide guidelines for future treatment control of selenium wastewater in China.

关 键 词：石灰石-石膏湿法 脱硫废水 四价硒 六价硒 废水治理 

分 类 号：X703.1[环境科学与工程—环境工程]