Specific Layered Structure of Anaerobic Granular Sludge Attenuates the Toxicity of Nano Zero-Valence Iron
The tolerance response of AGS to different dosage of nZVI with glucose and three volatile fatty acids (VFAs) as substrate were investigated to elucidate how nZVI affects the activity of anaerobic granular sludge (AGS) during anaerobic digestion process in this study.The distribution/formation of nZVl,contents of extracellular polymeric substances (EPS) after exposure to nZVI were further explored to assist in probing the mechanisms.The results showed that limited inhibition on the activity of AGS was exhibited,and the extra hydrogen gas released from the oxidation of nZVI was presumably suggested to stimulate the hydrogenotrphic methanogenesis process,resulting in methane production enhancement.The microscopic analysis indicated that nZVI particles were mainly adsorbed on the surface of AGS in the form of iron oxides aggregation without entering into the interior of the granule,protecting most cells from contact damage.Further experiments demonstrated that surrounded EPS located outer surface could be degraded by nZVI,weakening the toxicity of nZVI.In conclusion,the special layered structure of anaerobic granular sludge was able to attenuate the toxicity of nZVI.
Nano zero-valence iron (nZVI) anaerobic granular sludge (AGS) methane production anaerobic digestion
Chuanshu He Panpan He Houyun Yang Yang Mu Hanqing Yu
CAS Key Laboratory of Urban Pollutant Conversion, Collaborative Innovation Centre of Suzhou Nano Science and Technology, Department of Chemistry, University of Science and Technology of China, Hefei, China
国际会议
The 15th IWA World Conference on Anaerobic Digestion( 第15届IWA世界厌氧大会)
北京
英文
508-510
2017-10-17（万方平台首次上网日期，不代表论文的发表时间）