Carbon dioxide sequestration and methane production promotion by wollastonite in sludge anaerobic digestion.
Yan Zhang, Lihui Zhang, He Liu, Linlin Gong, Qianqian Jiang, Hongbo Liu, Bo Fu. 全文下载
School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
Jiangsu Key Laboratory of Anaerobic Biotechnology, Wuxi 214122, China
Jiangsu Collaborative Innovation Center of Water Treatment Technology and Material, Suzhou 215011, China
This study investigated the feasibility and performance of simultaneous in-situ CO2 sequestration and CH4 production promotion by wollastonite addition in sludge AD. A maximum CH4 yield increment of 30.8% and maximum methane production rate increment of 64.9% with wollastonite addition at dosage of 16.25 g/L were achieved. CO2 was efficient sequestered by wollastonite addition and resulted in a higher CH4 content of 81.7%-82.4%. The mechanism of CO2 sequestration by wollastonite was confirmed as Ca2+ release and subsequently carbonation based on cation and precipitates analysis. The results demonstrated that wollastonite could be applied as an effective additive for simultaneous in-situ CO2 sequestration and CH4 production promotion of sludge AD.
Waste activated sludge; Anaerobic digestion; CO2 sequestration; Mineral carbonation; Wollastonite;

Bioresource Technology
Elsevierjournal
10.1016/j.biortech.2018.10.004
2019
194-201
Elsevier Ltd