Potential application of Alcaligenes faecalis strain No. 4 in mitigating ammonia emissions from dairy wastewater

•A bioprocess for mitigating NH3 emissions from dairy wastewater is presented.•The bacterium A. faecalis strain No. 4 is viable for treating dairy wastewater.•Flushing reactor headspace with oxygen enhances this bioprocess.•Supplementing the wastewater with carbon also boosts this bioprocess. This r...

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Bibliographic Details
Published in:Bioresource technology 2016-04, Vol.206, p.36-42
Main Authors: Neerackal, George M., Ndegwa, Pius M., Joo, Hung-Soo, Wang, Xiang, Frear, Craig S., Harrison, Joseph H., Beutel, Marc W.
Format: Article
Language:English
Subjects:
Alcaligenes faecalis
Alcaligenes faecalis - metabolism
Ammonia - analysis
Batch aeration
Biological nitrogen removal
Biomass
Bioreactors
Carbon
Dairying
Manure
Nitrification-denitrification
Nitrogen - analysis
Nitrogen - metabolism
Nitrogen gas
Oxygen
Oxygenation
Waste Water - chemistry
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Summary:•A bioprocess for mitigating NH3 emissions from dairy wastewater is presented.•The bacterium A. faecalis strain No. 4 is viable for treating dairy wastewater.•Flushing reactor headspace with oxygen enhances this bioprocess.•Supplementing the wastewater with carbon also boosts this bioprocess. 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 4h) 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.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2016.01.063