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J Environ Sci (China)

Title:		Effect of manganese oxide-modified biochar addition on methane production and heavy metal speciation during the anaerobic digestion of sewage sludge
Author(s):		Li J; Zhang M; Ye Z; Yang C;
Address:		"Key Laboratory of Yangtze River Water Environment of the Ministry of Education, Tongji University, Shanghai 200092, China. Key Laboratory of Yangtze River Water Environment of the Ministry of Education, Tongji University, Shanghai 200092, China. Electronic address: cmyang@tongji.edu.cn"
Journal Title:		J Environ Sci (China)
Year:		2019
Volume:		20180519
Issue:
Page Number:		267 - 277
DOI:		10.1016/j.jes.2018.05.009
ISSN/ISBN:		1001-0742 (Print) 1001-0742 (Linking)
Abstract:		"Low organic matter content and high heavy metal levels severely inhibit the anaerobic digestion (AD) of sewage sludge. In this study, the effect of added manganese oxide-modified biochar composite (MBC) on methane production and heavy metal fractionation during sewage sludge AD was examined. The MBC could increase the buffering capacity, enhance the methane production and degradation of intermediate acids, buffer the pH of the culture, and stabilize the sewage sludge AD process. The application of MBC positively impacted methane production and the cumulative methane yield increased up to 121.97%, as compared with the control. The MBC addition can improve metal stabilization in the digestate. An optimum MBC dose of 2.36?ª+g was recommended, which would produce up to 121.1?ª+L/kg volatile solids of methane. After the AD process, even though most of the metals accumulated in the residual solids, they could be transformation from the bio-available fractions to a more stable fraction. The total organic- and sulfide-bound and residual fraction content at a 3?ª+g dose of MBC that is 0.12?ª+g/g dry matter were 51.06% and 35.11% higher than the control, respectively. The results indicated that the application of MBC could improve the performance of AD and promote stabilization of heavy metals in sewage sludge post the AD process"
Keywords:		"Anaerobiosis/drug effects Bioreactors/microbiology Charcoal/*chemistry/*pharmacology Hydrogen-Ion Concentration Manganese Compounds/*chemistry Methane/*biosynthesis Oxides/*chemistry Sewage/*chemistry/microbiology *Waste Disposal, Fluid Anaerobic digestio;"
Notes:		"MedlineLi, Jianhua Zhang, Min Ye, Zhiyin Yang, Changming eng Netherlands 2018/12/12 J Environ Sci (China). 2019 Feb; 76:267-277. doi: 10.1016/j.jes.2018.05.009. Epub 2018 May 19"