title: An innovative wood-chip-framework soil infiltrator for treating anaerobic digested swine wastewater and analysis of the microbial community.
abstract: Combined anaerobic-aerobic processes are efficacious and economic approaches in treating swine wastewater. Nitrogen removal efficiency of these processes, however, is usually limited due to the low carbon/nitrogen (C/N) ratio of the wastewater. An innovative wood-chip-framework soil infiltrator (WFSI) was developed and its performance in treating anaerobic digested swine wastewater was investigated. The WFSI showed comparable removal of chemical oxygen demand (COD) and amongst the highest efficiency of nitrogen removal in treating low C/N wastewater. At a COD volume loading rate of 98.6 g/m3 d the WFSI could remove up to 47.7 g/m3 d of COD. Removal rates of NH4+-N and total nitrogen, also reached 69.1 and 30.4 g/m3 d, respectively, when NH4+-N loading rate was 88.4 g/m3 d. Biological analysis indicated that aerobic, anoxic and anaerobic microbiota occurred throughout the WFSI. Abundant cellulose and lignin decomposing bacteria could degrade the wood chips and provided extra carbon source to enhance denitrification.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
authors.forename: Bowei
authors.initials: B
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China. Electronic address: jianzhengli@hit.edu.cn.
authors.forename: Jianzheng
authors.initials: J
authors.lastname: Li
authors.affiliation: Civil and Environmental Engineering Department, Hong Kong Polytechnic University, Kowloon, Hong Kong, China.
authors.forename: Shao-Yuan
authors.initials: SY
authors.lastname: Leu
mesh_terms: D000818:Animals; D001421:Bacteria, Anaerobic / Q000378:metabolism; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D058440:Denitrification; D009584:Nitrogen / Q000032:analysis / Q000737:chemistry; D012988:Soil Microbiology; D013552:Swine; D062065:Wastewater / Q000737:chemistry* / Q000382:microbiology; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*; D014934:Wood / Q000737:chemistry*
chemical_list: D009584:Nitrogen; D062065:Wastewater
keywords: Ammonia loading rate; Biofilter; Combined anaerobic–aerobic process; Nitrogen removal; Swine wastewater