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Title: REDUCTION OF GAS EMISSIONS FROM DAIRY MANURE STORAGES BY DIFFERENT BIOLOGICAL TREATMENT STRATEGIES

Author
item MA, YANGUO - UC DAVIS
item ZHANG, RUIHONG - UC DAVIS
item MITLOEHNER, FRANK - UC DAVIS
item McGarvey, Jeffery - Jeff

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 7/17/2005
Publication Date: 7/17/2005
Citation: Ma, Y., Zhang, R., Mitloehner, F., Mcgarvey, J.A. 2005. Reduction of gas emissions from dairy manure storages by different biological treatment strategies [abstract]. American Society for Agricultural Engineers Annual International Meeting, Tampa, FL. July 17-20, 2005. Paper No. 054054.

Interpretive Summary:

Technical Abstract: The effects of different manure treatment strategies on the gaseous emissions (CO2, CH4, H2S, NH3, VFAs and VOCs from dairy manure storages were investigated in the laboratory. The dairy manure used in the study was screened from fresh dairy manure that had 2% volatile solids. The treatment strategies include anaerobic treatment and aerobic treatment prior to the manure storage and aerostation in manure storage at different oxygen supplies. Anaerobic treatment was provided using an anaerobic digester (4 L) operated at 35°C and 20 days hydraulic retention time (HRT) to reduce VS in the manure by at least 40% prior to storage. Aerobic treatment was provided using an aerobic reactor (2 L) operated at room temperature (20°C) and 5-day HRT to provide 80% VS removal from the manure. The aerobic reactor was fully aerated at dissolved oxygen of 2 ppm or above. The anaerobically or aerobically treated manure was loaded into a sealed storage vessel on daily basis over a period of five months. Each of the three aerobic storages were fed once a day and operated at 20°C and were run for a period of three months. The gases in the digesters and storage vessels were sampled and analyzed for CH4, CO2, VFAs, VOCs, NH3 and H2S. The liquid in the digester and storage vessels were sampled and analyzed for VFAs, NH4+, S2-, pH and solids. Weekly or biweekly sampling and analysis were performed. The test results were analyzed to determine whether different treatment methods significantly reduced the gas emission, and how different treatment methods compare with regards to the costs and benefits if they are applied to the dairy farms.