Simultaneous heavy metals removal and municipal sewage sludge dewaterability improvement in bioleaching processes by various inoculums

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• 作者：Chaohong Shi ; Nengwu Zhu ; Ru Shang…
• 关键词：Bioleaching ; Bacterial consortium ; Heavy metals ; Dewaterability ; Secondary minerals
• 刊名：World Journal of Microbiology & Biotechnology
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：31
• 期：11
• 页码：1719-1728
• 全文大小：1,338 KB
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• 作者单位：Chaohong Shi (1)
  Nengwu Zhu (1) (2) (3)
  Ru Shang (1)
  Naixin Kang (1)
  Pingxiao Wu (1) (2) (3)
  
  1. School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
  2. The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education, Guangzhou, 510006, China
  3. The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, Guangzhou, 510006, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Applied Microbiology
  Biotechnology
  Biochemistry
  Environmental Biotechnology
  Microbiology
  
• 出版者：Springer Netherlands
• ISSN：1573-0972

文摘

The heavy metals content and dewaterability of municipal sewage sludge (MSS) are important parameters affecting its subsequent disposal and land application. Six kinds of inoculums were prepared to examine the characteristics of heavy metals removal and MSS dewaterability improvement in bioleaching processes. The results showed that Cu, Zn and Cd bioleaching efficiencies (12 days) were 81-1, 87-3 and 81-9 %, respectively, which were significantly higher than those of Fe–S control (P < 0.05) and blank control (P < 0.01). The bioleaching boosted by the prepared inoculums could also significantly enhance MSS dewaterability (P < 0.01). The centrifugal dehydration efficiency of MSS rose from 73.00 to 90.00 % at day 12. Microscopic observations and energy dispersive spectrum analysis demonstrated that the dewaterability improvement might be attributed to the changes of sludge structure from flocculent to obvious granular and the formation of secondary minerals mainly consisting of iron, oxygen and sulfur elements. The results above demonstrated that bacterial consortium enriched from acid mine drainage (AMD) was suitable to boost sludge bioleaching for heavy metals removal and dewaterability improvement. It also suggested that the synergy of sulfur/ferrous-oxidizing bacteria (SFOB) enriched from AMD and the cooperation of exogenous and indigenous SFOB significantly promoted bioleaching efficiencies. Keywords Bioleaching Bacterial consortium Heavy metals Dewaterability Secondary minerals