Free nitrous acid pretreatment of waste activated sludge enables enhanced volatile solids destruction and improved sludge dewaterability in continuous anaerobic digestion

摘要：

　　Free nitrous acid (FNA i.e.HNO2) pretreatment has been demonstrated to be effective in enhancing methane production from waste activated sludge (WAS) with biochemical methane production (BMP) tests,implying FNA-based pretreatment would enhance the destruction of volatile solids (VS) in an anaerobic sludge digester.However,this needs to be assessed also in continuous reactors,as BMP is conservative and does not allow direct analysis of VS destruction or residue analysis (such as dewaterability).This study experimentally evaluates the impact of FNA-based sludge pretreatment on the VS destruction of WAS and the dewaterability of digested sludge using continuously operated bench-scale anaerobic digesters.FNA pretreatment improved VS destruction (from 29.2±0.5% to 34.2±0.6%) and dewaterability (solids content from 12.2±0.2 to 13.9±0.2%),with the average improvement being approximately 17% and 14%,respectively.With inorganic solids representing 15-22% of the full-scale WAS used,FNA-pretreatment enables a volume reduction for final disposal by around 17%.The results indicate anaerobic digestion preceded by FNA pre-treatment could lead to a higher sludge reduction,thereby significantly reducing the costs for wastewater treatment.

关键词： Free nitrous acid anaerobic digestion dewaterability sludge reduction

作者: Wei Wei Qilin Wang Liguo Zhang Damien J.Batstone Zhiguo Yuan

作者单位: Advanced Wastewater Management Centre, The University of Queensland, St.Lucia, QLD 4072, Australia Advanced Wastewater Management Centre, The University of Queensland, St.Lucia, QLD 4072, Australia;G

会议类型: 国际会议

会议名称: The 15th IWA World Conference on Anaerobic Digestion( 第15届IWA世界厌氧大会)

会议地点: 北京

会议语种:英文

页码: 726-728

在线出版日期: 2017-10-17（万方平台首次上网日期，不代表论文的发表时间）