Combined zero valent iron and hydrogen peroxide conditioning significantly enhances the dewaterability of anaerobic digestate.

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ID: 108319
2018
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Abstract
The importance of enhancing sludge dewaterability is increasing due to the considerable impact of excess sludge volume on disposal costs and on overall sludge management. This study presents an innovative approach to enhance dewaterability of anaerobic digestate (AD) harvested from a wastewater treatment plant. The combination of zero valent iron (ZVI, 0-4.0g/g total solids (TS)) and hydrogen peroxide (HP, 0-90mg/g TS) under pH3.0 significantly enhanced the AD dewaterability. The largest enhancement of AD dewaterability was achieved at 18mg HP/g TS and 2.0g ZVI/g TS, with the capillary suction time reduced by up to 90%. Economic analysis suggested that the proposed HP and ZVI treatment has more economic benefits in comparison with the classical Fenton reaction process. The destruction of extracellular polymeric substances and cells as well as the decrease of particle size were supposed to contribute to the enhanced AD dewaterability by HP+ZVI conditioning.
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wang2018combinedjournal Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Wang, Qilin;Sun, Jing;Song, Kang;Zhou, Xu;Wei, Wei;Wang, Dongbo;Xie, Guo-Jun;Gong, Yanyan;Zhou, Beibei;
Journal Journal of environmental sciences (China)
Year 2018
DOI
S1001-0742(17)30177-8
URL
Keywords
hydrogen peroxide sludge dewaterability zero valent iron anaerobic digestate

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