title: Simultaneous nitrogen and carbon removal from swine digester liquor by the Canon process and denitrification.
abstract: A laboratory-scale completely autotrophic nitrogen removal over nitrite (Canon) biofilm reactor was applied to remove nitrogen and organic carbon from swine digester liquor for 150 d. A stable nitrogen removal rate was reached after a three-week adaptation period. The nitrogen loading rate of influent were 0.20±0.04, 0.26±0.04, 0.26±0.07 kg N m(-3) d(-1) in period I, II and III, respectively. Nitrogen removal rates reached 0.096, 0.133 and 0.104 kg N m(-3) d(-1) when the C/N ratios of liquor were maintained at 0.81, 0.65, and 1.24, respectively. The Canon process was better than the denitrification process for nitrogen elimination when the C/N ratio of the influent was controlled below 0.8. PCR-DGGE analysis showed a decrease in microbial diversity of Planctomycetes during long-term operation. In contrast, the aerobic ammonium-oxidizing bacteria species were resistant to the changes due to replacement of synthetic wastewater with swine digester liquor.
authors.affiliation: Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China.
authors.forename: Zhaoji
authors.initials: Z
authors.lastname: Zhang
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Li
authors.forename: Shaohua
authors.initials: S
authors.lastname: Chen
authors.forename: Shumei
authors.initials: S
authors.lastname: Wang
authors.forename: Xiaodan
authors.initials: X
authors.lastname: Bao
mesh_terms: D000383:Agriculture; D000818:Animals; D001420:Bacteria, Aerobic / Q000378:metabolism*; D002244:Carbon / Q000302:isolation & purification / Q000378:metabolism*; D007220:Industrial Waste / Q000517:prevention & control*; D009584:Nitrogen / Q000302:isolation & purification / Q000378:metabolism*; D013552:Swine; D014874:Water Pollutants, Chemical / Q000302:isolation & purification / Q000378:metabolism*; D018508:Water Purification / Q000379:methods*
chemical_list: D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D002244:Carbon; D009584:Nitrogen