title: Potential application of Alcaligenes faecalis strain No. 4 in mitigating ammonia emissions from dairy wastewater.
abstract: This research examined the potential mitigation of NH3 emissions from dairy manure via an enhanced aerobic bio-treatment with bacterium Alcaligenes faecalis strain No. 4. The studies were conducted in aerated batch reactors using air and pure oxygen. Aeration with air and oxygen removed approximately 40% and 100% total ammoniacal nitrogen (TAN), respectively. Intermittent oxygenation (every 2 or 4 h) reduced oxygen consumption by 95%, while attaining nearly identical TAN removal to continuous aeration. The results revealed that adequate oxygen supply and supplementing dairy wastewater with carbon are essential for this bioprocess. Based on the nitrogen mass balance, only 4% of TAN was released as NH3 gas, while the majority was retained in either the microbial biomass (58%) or converted to nitrogen gas (36%). The mass balance results reveal high potential for environmentally friendly bio-treatment of dairy wastewater using A. faecalis strain No. 4 with respect to NH3 emissions.
authors: Department of Biological Systems Engineering, Washington State University, PO Box 646120, Pullman, WA 99164, USA.
authors: George M
authors: GM
authors: Neerackal
authors: Department of Biological Systems Engineering, Washington State University, PO Box 646120, Pullman, WA 99164, USA. Electronic address: ndegwa@wsu.edu.
authors: Pius M
authors: PM
authors: Ndegwa
authors: School of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdan-Gwagiro, Buk-gu, Gwangju 500-712, Republic of Korea.
authors: Hung-Soo
authors: HS
authors: Joo
authors: Department of Biological Systems Engineering, Washington State University, PO Box 646120, Pullman, WA 99164, USA.
authors: Xiang
authors: X
authors: Wang
authors: Department of Biological Systems Engineering, Washington State University, PO Box 646120, Pullman, WA 99164, USA.
authors: Craig S
authors: CS
authors: Frear
authors: Department of Animal Sciences, Washington State University, 2606 West Pioneer, Puyallup, WA 98371, USA.
authors: Joseph H
authors: JH
authors: Harrison
authors: School of Engineering, University of California Merced, 5200 North Lake Road, Merced, CA 95343, USA.
authors: Marc W
authors: MW
authors: Beutel
mesh_terms: D042481:Alcaligenes faecalis / Q000378:metabolism*; D000641:Ammonia / Q000032:analysis*; D018533:Biomass; D019149:Bioreactors; D002244:Carbon; D003612:Dairying; D008372:Manure; D009584:Nitrogen / Q000032:analysis / Q000378:metabolism*; D010100:Oxygen; D062065:Wastewater / Q000737:chemistry*
chemical_list: D000641:Ammonia; D002244:Carbon; D008372:Manure; D009584:Nitrogen; D010100:Oxygen; D062065:Wastewater
keywords: Batch aeration; Biological nitrogen removal; Nitrification-denitrification; Nitrogen gas; Oxygenation