title: Effects of aerobic and anaerobic biological processes on leaching of heavy metals from soil amended with sewage sludge compost.
abstract: The risk from leaching of heavy metals is a major factor hindering land application of sewage sludge compost (SSC). Understanding the change in heavy metal leaching resulting from soil biological processes provides important information for assessing long-term behavior of heavy metals in the compost amended soil. In this paper, 180days aerobic incubation and 240days anaerobic incubation were conducted to investigate the effects of the aerobic and anaerobic biological processes on heavy metal leaching from soil amended with SSC, combined with chemical speciation modeling. Results showed that leaching concentrations of heavy metals at natural pH were similar before and after biological process. However, the major processes controlling heavy metals were influenced by the decrease of DOC with organic matter mineralization during biological processes. Mineralization of organic matter lowered the contribution of DOC-complexation to Ni and Zn leaching. Besides, the reducing condition produced by biological processes, particularly by the anaerobic biological process, resulted in the loss of sorption sites for As on Fe hydroxide, which increased the potential risk of As release at alkaline pH.
authors.affiliation: Key Laboratory for Solid Waste Management and Environment Safety, School of Environment, Tsinghua University, Beijing, PR China.
authors.forename: Wen
authors.initials: W
authors.lastname: Fang
authors.affiliation: Key Laboratory for Solid Waste Management and Environment Safety, School of Environment, Tsinghua University, Beijing, PR China.
authors.forename: Yonghong
authors.initials: Y
authors.lastname: Wei
authors.affiliation: Key Laboratory for Solid Waste Management and Environment Safety, School of Environment, Tsinghua University, Beijing, PR China. Electronic address: jgliu@tsinghua.edu.cn.
authors.forename: Jianguo
authors.initials: J
authors.lastname: Liu
authors.affiliation: Department of Civil and Environmental Engineering, Vanderbilt University, Nashville, TN, USA.
authors.forename: David S
authors.initials: DS
authors.lastname: Kosson
authors.affiliation: Hans van der Sloot Consultancy, Langedijk, The Netherlands.
authors.forename: Hans A
authors.initials: HA
authors.lastname: van der Sloot
authors.affiliation: Department of Civil and Environmental Engineering, Vanderbilt University, Nashville, TN, USA.
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D001151:Arsenic / Q000032:analysis; D001673:Biodegradation, Environmental; D002681:China; D006863:Hydrogen-Ion Concentration; D019216:Metals, Heavy / Q000032:analysis; D009532:Nickel / Q000032:analysis; D012722:Sewage / Q000737:chemistry; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis; D015032:Zinc / Q000032:analysis
chemical_list: D019216:Metals, Heavy; D012722:Sewage; D012987:Soil; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D009532:Nickel; D015032:Zinc; D001151:Arsenic
keywords: Aerobic and anaerobic biological processes; Compost amended soil; Heavy metal leaching behavior; Organic matter mineralization; Reducing condition