Reducing Gas Emissions from Manure Storages by Anaerobic Digestion and Aeration Technologies Ruihong Zhang 1 , Frank Mitloehner 1 , Yanguo Ma 1 , Jeff McGarvey 2 1 University of California, Davis 2 USDA-ARS Western Regional Research Center Sponsor: California Regional Water Control Board
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Reducing Gas Emissions from ManureStorages by Anaerobic Digestion and Aeration
Technologies
Ruihong Zhang1, Frank Mitloehner1, Yanguo Ma1,Jeff McGarvey2
1University of California, Davis2USDA-ARS Western Regional Research Center
Sponsor: California Regional Water Control Board
Gases from Manure StorageGas emission involves two processes - Generation by biochemical and chemical reactions - Mass transfer at the surface
Gas concentrations in the manure, related togeneration in the manureSurface area of storageEnvironmental conditions (temperature andwind speed at the surface)
Methods for Reducing Emissions inManure Storages
Covering storagesTreating manure prior to storage to reduce thegases generated in the storage
Solid-liquid separationBiological treatment
- Anaerobic Digestion- Aeration
Anaerobic Digestion and Aeration
Both processes use bacteria to break down andconvert organic matter under controlled conditions(retention time, temperature, organic loading rate,pH)
Both processes provide these environmental andpublic health benefits
Research ObjectivesQuantify the effects of manure treatment byanaerobic digestion and aeration onemission reduction of gases (VOCs, CH4,H2S, NH3) from manure storagesDetermine the costs and benefits ofdifferent biological treatment technologies
ConclusionsAnaerobic digestion and aeration haveshown significant effects on the reductionof VOCs, VFAs, CH4, H2S in manurestorage.Their gas reduction quantity for manurestorages are influenced by the temperaturevariation in the storages, therefore thesetechnologies should be evaluated fordifferent seasons.
Continuing ResearchDetermine the effects of anaerobic andaerobic treatment on gas production over alonger period (180 days) of storage time.Determine the effects of aeration in manurestorages on gas production in the storage.Determine the costs and benefits ofdifferent biological treatment processes.