title: Elimination of NH₃ and odor from composting by biotrickling filter and preliminary exploration on molecular biology.
abstract: A biotrickling filter was focused on treatment of odorous NH(3) gas, along with volatile organic compounds (VOCs) and other odorous gases during cattle manure composting. The biotrickling filter could treat NH(3), the main composition, with removal efficiencies of close to 100% because NH(4)(+) was bio-oxidized in the biofilm to NO(3)(-) resulting final NO(3)(-) concentrations of about 1000 mg/L. Results of polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) revealed that ammonia-oxidizing bacteria, Nitrosospira sp, and nitrite-oxidizing bacteria, Nitrococcus mobilis, coexisted in the biofilm. There were 23 kinds of VOCs detected in the exhaust gas. A significant observation was that the biofilm itself of the biotrickling biofilter released VOCs. The odor concentrations of inlet and outlet gases were 1425 and 110, respectively, with removal efficiency of 92.2%, suggesting that the biotrickling filter was effective for treatment of odorous gases during composting.
authors.affiliation: Department of Environmental Engineering, School of Civil and Environmental Engineering, University of Science and Technology, Beijing 100083, 30 Xueyuan Road, Haidian District, Beijing, China.
authors.forename: Niantao
authors.initials: N
authors.lastname: Xue
authors.forename: Qunhui
authors.initials: Q
authors.lastname: Wang
authors.forename: Chuanfu
authors.initials: C
authors.lastname: Wu
authors.forename: Peng
authors.initials: P
authors.lastname: Zhao
authors.forename: Weimin
authors.initials: W
authors.lastname: Xie
mesh_terms: D000641:Ammonia / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D000818:Animals; D001419:Bacteria / Q000235:genetics* / Q000378:metabolism*; D001673:Biodegradation, Environmental; D002417:Cattle; D004269:DNA, Bacterial / Q000235:genetics; D005374:Filtration / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D008967:Molecular Biology; D058465:Nitrification; D009584:Nitrogen / Q000737:chemistry; D009812:Odorants; D016133:Polymerase Chain Reaction; D012987:Soil / Q000737:chemistry*; D055549:Volatile Organic Compounds / Q000302:isolation & purification / Q000378:metabolism
chemical_list: D004269:DNA, Bacterial; D012987:Soil; D055549:Volatile Organic Compounds; D000641:Ammonia; D009584:Nitrogen