摘要
城市地下污水管网沉积物有机质含量高,氮磷含量丰富,是可利用的有机肥源,但由于汞等有毒重金属含量较高,城市地下污水管网沉积物可能造成土壤重金属污染。为了降低城市地下污水管网沉积物中汞的活性,减少城市地下污水管网沉积物可能造成的土壤重金属汞的污染风险,选用脱硫石膏、粉煤灰、磷矿粉、膨润土和海泡石5种钝化剂,采用实验室模拟,以相同的比例(5%)添加于不同地下污水管网沉积物中,研究了钝化剂对城市地下污水管网沉积物中汞形态分布和活性的影响。结果表明:钝化剂对汞形态分布和活性的影响程度有差异,根据汞的活性下降程度,钝化剂对城市地下污水管网沉积物中汞的钝化效果强弱顺序为脱硫石膏>海泡石>粉煤灰>磷矿粉>膨润土,脱硫石膏和海泡石更适合作为城市地下污水管网沉积物中汞的钝化剂。
The sediment from urban underground sewage network,due to its high content of organic matter and rich nitrogen and phosphorus,is an available source of organic fertilizer. However,sediment may cause heavy metal pollution in soil because of the existence of toxic heavy metals,especially mercury. In order to reduce pollution risk in using urban sediment as fertilizer by decreasing activity of mercury in the sediment,the effects of passivating reagents on morphological distribution and activity of mercury in the sediment were studied by adding five kinds of passivating agent,including desulfurization gypsum,flyash,phosphate rock,bentonite and sepiolite,under the laboratory simulation,at the same ratio of 5%,into urban underground sewage network sediment. The results showed that five passivating agents had different effects on morphological distribution and activity of mercury in the sediment,and the passivation was in the order of desulfurization gypsum sepiolitefly ash phosphate rock bentonite according to decline degree of mercury activity. Consequently,gypsum and sepiolite were more suitable as passivating agents for mercury in sediment from urban underground sewage network.
作者
李娜
王筱涵
尹秀玲
徐聪珑
马金才
谢忠雷
LI Na;WANG Xiaohan;YIN Xiuling;XU Conglong;MA Jincai;XIE Zhonglei(College of Environment and Resources, Jilin University, Changchun 130021, China)
出处
《吉林农业大学学报》
CAS
CSCD
北大核心
2018年第3期332-338,共7页
Journal of Jilin Agricultural University
基金
农业部产地环境污染防控重点实验室/天津市农业环境与农产品安全重点实验室开放基金课题
国家自然科学基金项目(41571304)
关键词
城市地下污水管网沉积物
钝化剂
汞
形态分布
活性
sediment of urban underground sewage network
passivating agent
mercury
morpho- logical distribution
activity
作者简介
李娜，女，硕士研究生，研究方向：土壤重金属污染修复。;通信作者
