The underlying mechanism of calcium peroxide pretreatment enhancing methane production from anaerobic digestion of waste activated sludge

Water Research
Dongbo WangHailong Li

Abstract

Recent investigations verified that calcium peroxide (CaO2) could be used to pretreat waste activated sludge to promote methane yield from anaerobic digestion. However, the underlying mechanism of how CaO2 pretreatment promotes methane production is unclear. This work therefore aims to provide insights into such systems. Experimental results showed that with an increase of CaO2 dosage from 0 to 0.14 g/g VSS (volatile suspended solids) the methane yield increased linearly from 146.3 to 215.9 mL/g VSS. Further increases of CaO2 resulted in decreases in methane yield. CaO2 pretreatment promoted the disintegration of sludge and the degradation of sludge recalcitrant organics (especially humus and lignocellulose), thereby providing more substrates for subsequent methane production. Ultraviolet absorption spectroscopy indicated that CaO2 enhanced the cleavage of unsaturated conjugated bonds and reduced the aromaticity of humus and lignocellulose. Fourier transform infrared spectroscopy showed that CaO2 changed the structures and functional groups of humus and lignocellulose, making them transform to be biodegradable. GC/MS analyses exhibited that the degradation products of humus and lignocellulose included several types of small mol...Continue Reading

Citations

Feb 6, 2020·Environmental Science and Pollution Research International·Rania Mona AlqarallehRobert Delatolla
May 3, 2020·Environmental Science and Pollution Research International·Guangxue JiLi'an Hou
Jan 5, 2021·Frontiers in Bioengineering and Biotechnology·Aikaterini A MaziotiIoannis Vyrides
Dec 2, 2020·The Science of the Total Environment·Mei ZouHongbo Chen
Jan 13, 2021·The Science of the Total Environment·Meng GaoWalter Z Tang
Sep 28, 2020·Water Research·Qiuxiang XuBing-Jie Ni
Aug 9, 2020·Journal of Hazardous Materials·Dongbo WangJin Huang
Mar 26, 2021·Bioresource Technology·Qiuxian QiYen Wah Tong
Apr 26, 2021·Environmental Science and Pollution Research International·Yongliang WangXiaoqiang Zhu
Jul 31, 2021·The Science of the Total Environment·Hoang Nhat Phong VoXinbo Zhang
Nov 27, 2021·The Science of the Total Environment·Chen WangBing-Jie Ni

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