Effect of Calcium Ions on Dewaterability of Enzymatic-Enhanced Anaerobic Digestion Sludge

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• 作者：Kun Luo ; Qi Yang ; Xiao-ming Li ; Shi-ying Zhang…
• 关键词：Dewaterability ; Enzyme ; Anaerobic digestion ; CaCl2 ; Waste ; activated sludge (WAS)
• 刊名：Applied Biochemistry and Biotechnology
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：176
• 期：8
• 页码：2346-2357
• 全文大小：737 KB
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• 作者单位：Kun Luo (1)
  Qi Yang (2)
  Xiao-ming Li (2)
  Shi-ying Zhang (1)
  Ya Pang (1)
  Xue Li (1)
  Xing-sheng Liao (1)
  
  1. Department of Biological and Environmental Engineering, Changsha University, Changsha, 410003, People’s Republic of China
  2. College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Biotechnology
  Biochemistry
  
• 出版者：Humana Press Inc.
• ISSN：1559-0291

文摘

Waste-activated sludge (WAS) solubilized remarkably after enzymatic-enhanced anaerobic digestion, but its dewaterability was deteriorated. In this study, a novel method was performed to improve the dewaterability of enzymatic-enhanced anaerobic digestion sludge by adding CaCl2 (0.01~1.00?g/g total sludge). The capillary suction time (CST), moisture content, and filtrate turbidity were employed to characterize the dewaterability of WAS, and the possible mechanisms involved were clarified. The results showed the dewaterability did not worsen when CaCl2 was added before sludge digestion, and the CST, moisture content, and filtrate turbidity were notably reduced with the increase of CaCl2 dosage. It also shown that calcium ions played an important role in the bioflocculation of digested sludge by neutralizing negative charges on the surface of sludge. In addition, soluble protein initially lowered a little and then observably improved with the addition of CaCl2, while soluble carbohydrate was reduced sharply first and then bounced back afterwards. The interactions between calcium ions and the biopolymer further enhanced the dewatering of sludge through bridging of colloidal particles together.