title: Comparison of nitrogen removal and microbial properties in solid-phase denitrification systems for water purification with various pretreated lignocellulosic carriers.
abstract: This study explored the water purification performances of solid-phase denitrification systems filled with either untreated, acid and alkali pretreated corncob, rice straw and rice hulls. Nitrate reduction improved via pretreatments was found in ascending order from corncob, rice straw and rice hulls systems due to their various chemical compositions, while the pretreated rice hull systems still had the lowest nitrate reduction efficiencies (<90%). Besides, nitrite accumulation only frequently detected (<0.5mgL-1) in rice hulls system especially in untreated system, while ammonium occurrences in effluent were much more prevalent in corncob and rice straw systems than those of rice hulls system, and could be impaired via acid pretreatment. Miseq sequencing analysis showed that the higher abundances of dominant denitrifiers (Bosea, Acidovorax, Simplicispira, Dechloromonas, etc.) and fermentative anaerobic bacteria (Actinotalea, Cellulomonas, Opitutus, etc.) co-existed in the pretreated systems than those of none pretreatment, which was vital for efficiently sustainable nitrogen removal.
authors.affiliation: Department of Environmental Science and Engineering, Zhejiang Ocean University, No.1 Haida South Road, Zhoushan 316022, China.
authors.forename: Lijuan
authors.initials: L
authors.lastname: Feng
authors.affiliation: Department of Environmental Science and Engineering, Zhejiang Ocean University, No.1 Haida South Road, Zhoushan 316022, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Chen
authors.affiliation: Department of Environmental Science and Engineering, Zhejiang Ocean University, No.1 Haida South Road, Zhoushan 316022, China.
authors.forename: Doudou
authors.initials: D
authors.lastname: Han
authors.affiliation: Department of Environmental Science and Engineering, Zhejiang Ocean University, No.1 Haida South Road, Zhoushan 316022, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Department of Environmental Science and Engineering, Zhejiang Ocean University, No.1 Haida South Road, Zhoushan 316022, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Lu
authors.affiliation: Department of Environmental Science and Engineering, Zhejiang Ocean University, No.1 Haida South Road, Zhoushan 316022, China. Electronic address: ygfscu@126.com.
authors.forename: Guangfeng
authors.initials: G
authors.lastname: Yang
authors.affiliation: Department of Environmental Science and Engineering, Zhejiang Ocean University, No.1 Haida South Road, Zhoushan 316022, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Mu
authors.affiliation: Zhoushan Agro-forestry, Fishery and Rural Areas Committee of Zhejiang, Zhoushan 316021, China.
authors.forename: Xiangjiong
authors.initials: X
authors.lastname: Zhao
mesh_terms: D064751:Ammonium Compounds / Q000737:chemistry / Q000378:metabolism; D002244:Carbon / Q000737:chemistry; D042621:Comamonadaceae / Q000378:metabolism; D058440:Denitrification; D008031:Lignin / Q000737:chemistry* / Q000378:metabolism; D059013:Microbial Consortia / Q000235:genetics / Q000502:physiology*; D009566:Nitrates / Q000737:chemistry; D009573:Nitrites / Q000737:chemistry; D009584:Nitrogen / Q000302:isolation & purification* / Q000378:metabolism; D012275:Oryza / Q000737:chemistry; D018520:Plant Shoots / Q000737:chemistry / Q000378:metabolism; D018508:Water Purification / Q000379:methods*; D003313:Zea mays / Q000737:chemistry / Q000378:metabolism
chemical_list: D064751:Ammonium Compounds; D009566:Nitrates; D009573:Nitrites; C036909:lignocellulose; D002244:Carbon; D008031:Lignin; D009584:Nitrogen
keywords: Corncob; Pretreatment; Rice hulls; Rice straw; Solid-phase denitrification (SPD)