黑臭底泥的电渗脱水特性及污染物迁移规律  

Study on Dewatering Characteristics and Pollutant Migration of Black-Odorous River Sediments during Electroosmotic Operation

作　　者：胡天怡 胡悦 赵立坤 王旭[1] 汤丁丁 毛旭辉[1] 朱华[1] HU Tianyi;HU Yue;ZHAO Likun;WANG Xu;TANG Dingding;MAO Xuhui;ZHU Hua(School of Resource and Environmental Science,Wuhan University,Wuhan 430079,China)

机构地区：[1]武汉大学资源与环境科学学院,湖北武汉430079

出　　处：《环境科学与技术》2020年第10期103-110,共8页Environmental Science & Technology

基　　金：国家自然科学基金(51709011)。

摘　　要：为探究电渗处理底泥的可行性,明确电渗处理中污染物迁移规律,该研究以实际湖泊污泥作为对象,开展了不同电压条件下的电渗实验。实验结果表明,随着电压强度增加,电渗出水累计量和出水速率增加,电压为20 V时底泥含水率从43.3%降低到24.5%,24 h累计出水量是对照组的3倍。电渗促进底泥中的氨氮、磷随电渗出水迁移,电压20 V处理24 h后底泥中全氮、全磷的含量分别下降了22%、8.4%。电渗出水的溶解性有机物光谱学分析证实电渗处理有助于底泥的腐殖化程度降低。底泥中的酸挥发性硫化物含量在电渗处理后下降了约76%,说明电渗能有效缓解底泥的致黑臭程度。总体而言,电渗处理有助于底泥中氮磷营养盐、溶解性有机物等污染物的迁移和降解,有效缓解底泥的黑臭程度。In order to explore the feasibility of using electroosmotic process for the dewatering of contaminated sediments and unravel the regularity of pollutant migration in electroosmosis treatment,the sediments of real lake were taken as the target,and electroosmosis experiments were carried out under different voltages.The experimental results showed that with the increase of cell voltage,the accumulative amount of electroosmosis water and outlet rate increased.When the cell voltage was 20 V,the moisture content of sediment decreased from 43.3%to 24.5%,and the accumulative water output in 24 h was3 times higher than of the control group.Electroosmosis promoted the migration of ammonia nitrogen and phosphorus in the sediment with the electric exudation water,and the contents of total nitrogen and total phosphorus in the sediment decreased by 22%and 8.4%,respectively,after treatment with a voltage of 20 V for 24 h.Spectroscopic analysis of dissolved organic matter in the electro exudate confirmed that the electroosmotic treatment was helpful to reduce the humus degree of the sediment.The content of acid volatile sulfide in the sediment decreased by about 76%after electroosmosis,indicating that the electroosmotic operation could effectively alleviate the blackness and odor of the sediment.In general,electroosmotic operation is conducive to the migration and degradation of nitrogen and phosphorus nutrient salts,dissolved organic substances and other pollutants in the sediment,and effectively alleviates the blackness and odor degree of the sediments.

关 键 词：电渗处理 污泥脱水 电压强度 污染物迁移 

分 类 号：X52[环境科学与工程—环境工程]