Pilot study of intense dewatering of urban sewage sludge
详细信息 查看全文
- 作者：Ying Huang ; Leilei Yu ; Ruihui Wang ; Jian Wu…
- 关键词：Urban sewage sludge ; Intense dewatering ; Water content ; Calorific value
- 刊名：Journal of Material Cycles and Waste Management
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：19
- 期：1
- 页码：88-101
- 全文大小：
- 刊物类别：Earth and Environmental Science
- 刊物主题：Civil Engineering; Waste Management/Waste Technology; Environmental Management;
- 出版者：Springer Japan
- ISSN：1611-8227
- 卷排序：19
文摘
Urban sewage sludge treatment has become a severe problem due to its large quantities and enrichment with heavy metals, refractory organic contaminants and pathogenic bacteria. Accordingly, it is essential to develop an effective and low-cost intense dewatering technique to decrease sludge water content so that it can be easily treated by subsequent incineration, landfilling or composting. In this study, a new intense sludge dewatering technique using conditioner of coagulant and flocculant (polyacrylamide) mixture and the diaphragm filter press was developed and investigated systematically by measuring the water content, calorific value and coliform bacteria in the sludge and investigating the dewatering efficiency under different conditions. The results showed that the water content of the sludge was effectively reduced from 80 % to the minimum of 43.6 % by adding conditioners and subsequent dewatering using the diaphragm press. Moreover, the low calorific value of dewatered sludge increased significantly from that of the original sludge, and was conducive to subsequent incineration. The water content of the dewatered sludge cake decreased to less than 25 % after being kept in the open air for 9 days. Therefore, it is proposed that this technique be applied to large-scale engineering applications.