【作者】 方程； 王旭彤； 常可可； 颜蓓蓓； 许飞； 陈冠益； 旦增；

【Author】 Fang Cheng;Wang Xutong;Chang Keke;Yan Beibei;Xu Fei;Chen Guanyi;Dan Zeng;Department of Science, Tibet University;Department of Environmental Science and Engineering, Tianj in University;Department of Mechanical Engineering,Tianjin University of Commerce;

【机构】 西藏大学理学院； 天津大学环境科学与工程学院； 天津商业大学机械工程学院；

【摘要】 通过对拉萨、日喀则、那曲、昌都地区污水处理厂的污泥采样,分析研究了西藏地区污泥重金属总量及形态并结合重金属污染评价方法予以评估该地区污泥中重金属对环境造成的生态危害。结果表明:该地区污泥Cu、Zn、Cd、Pb元素形态主要以交换态和还原态的形式存在,有着较好的利用性。通过内梅罗指数评价方法得出4个城市:日喀则、那曲、昌都、拉萨的污泥中Cd元素存在着严重超标,4个污水厂Cd评价指数为72.33、56.63、137.32、117.5,内梅罗指数>3.0已达到重度污染的水平,其他元素也存在着不同程度的环境危害,综合4种评价方法得出本文得出污染风险等级从大到小为Cd>Zn>Cu>As>Pb>Ni>Cr。故西藏地区污泥存在重金属污染风险,污泥处理处置工作需重视重金属污染风险控制,且对于西藏地区生态环境保护有着重要促进意义。更多还原

【Abstract】 Municipal sludge were collected from Lhasa, Shigatse,nagqu and qamdo wastewater treatment plant. This paper analyzed the total amount heavy metals in Tibet’s sludge and different forms of heavy metals, by assessed the ecological harm caused due to heavy metals in the sludge in the region to the environment in combination with heavy metal pollution evaluation methods. The research results show that the Cu, Zn, Cd, and Pb element forms of the sludge in this area mainly exist in the form of exchanged and reduced states, which have good utilization. The Cd element in the sludge of the following four cities in China’s Tibet region: Shigatse, Nagqu, Qamdo, and Lhasa is obtained by Nemeiro Index. The Cd element in the sludge of the four sewage treatment plants is 72. 33, 56. 63, 137. 32, and 117. 5. Nemeiro index greater than 3. 0 has reached the level of severe pollution, and other elements also have varying degrees of environmental hazards. Based on the four evaluation methods, the paper concludes that the pollution risk level from large to small is: Cd>Zn>Cu>As>Pb>Ni>Cr. Therefore, there is a risk of heavy metal pollution in sludge in Tibet. The treatment and disposal of sludge needs to pay attention to the risk control of heavy metal pollution, and it is of great significance to protection the ecological environment of Tibet.更多还原