title: Influence of sand layer depth on partial nitritation as pretreatment of anaerobically digested swine wastewater prior to anammox.
abstract: This work aimed to investigate the influence of sand layer depth on partial nitritation performance as a preparative step for anaerobic ammonium oxidation (anammox) process in treating anaerobically digested effluent of swine wastewater. A lab-scale biological sand filter system was constructed and partial nitritation was successfully maintained with nitrogen loading rate (NLR) of approximately 50 g NH(4)(+)-N m(-3) d(-1). An average NH(4)(+)-N removal efficiency of 61.34% and conversion efficiency of NH(4)(+)-N to NO(2)(-)-N of 79.77% were achieved with a sand layer depth of 32 cm. An effluent with a NH(4)(+)-N concentration of 242.52 mg L(-1) and a NO(2)(-)-N concentration of 306.39 mg L(-1) was achieved when the sand layer depth was 32 cm, giving a NO(2)(-)-N/NH(4)(+)-N ratio close to 1.32, as required by anammox. Overall, using a biological sand filter system to treat anaerobically digested effluent of swine wastewater by partial nitritation pretreatment prior to anammox is feasible.
authors.affiliation: Biogas Scientific Research Institute of the Ministry of Agriculture, Chengdu 610041, PR China.
authors.forename: Dan
authors.initials: D
authors.lastname: Zheng
authors.forename: Liang-Wei
authors.initials: LW
authors.lastname: Deng
authors.forename: Zhan-Hui
authors.initials: ZH
authors.lastname: Fan
authors.forename: Gang-Jin
authors.initials: GJ
authors.lastname: Liu
authors.forename: Chuang
authors.initials: C
authors.lastname: Chen
authors.forename: Hao
authors.initials: H
authors.lastname: Yang
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
mesh_terms: D000818:Animals; D001421:Bacteria, Anaerobic / Q000378:metabolism*; D005240:Feasibility Studies; D005374:Filtration / Q000379:methods*; D010084:Oxidation-Reduction; D000644:Quaternary Ammonium Compounds / Q000302:isolation & purification* / Q000378:metabolism*; D012987:Soil; D012988:Soil Microbiology; D013552:Swine; D014874:Water Pollutants, Chemical / Q000302:isolation & purification* / Q000378:metabolism*; D018508:Water Purification / Q000379:methods*
chemical_list: D000644:Quaternary Ammonium Compounds; D012987:Soil; D014874:Water Pollutants, Chemical