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Relationship between physicochemical properties and dewaterability of hydrothermal sludge derived from different source

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Journal of Environmental Sciences 2018年第7期30卷 261-270页

作者： Xiuzheng Zhuang Yanqin Huang Huacai Liu Hongyou Yuan Xiuli Yin Chuangzhi Wu Cuangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 501640 China CAS Key Laboratory of Renewable Energy Guangzhou 501640 China Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development Guangzhou 501640 China University of Chinese Academy of Sciences Beijing 10049 China

Sewage sludge（SS） and deinking sludge（DS） were used to comparatively study the hydrothermal dewatering of sludge with different components. For a better overview, an insight into the relationship between physicochemical properties and dewaterability of hydrothermal sludge was provided. Results found that not all kinds of sludge were suitably conditioned by hydrothermal treatment（HT） in term of the elevation of *** hydrothermal temperature tended to enhance the dewaterability of SS rather than DS, which was supported by the variation of their physicochemical properties（including water distribution, bonding energy, extracellular polymeric substance（EPS）, particles size,acid functional groups and zeta potential in this study）. In addition, the changes in surface morphology suggested that the reverse effect of HT on sludge dewaterability was mainly due to their dewatering behavior. For SS, the destruction of EPS structure leaded to the release of bound water, thereby strengthening sludge dewatering. Conversely, ＂Bridging effect＂ generated by lignocellulose in DS was beneficial for sludge dewatering; however, the increasing hydrothermal temperature degraded part of lignocellulose and weakened＂bridging effect＂, finally resulting in worse dewaterability of DS.

关键词： Sludge component Hydrothermal treatment dewatering behavior Physicochemical properties

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