Journal article
Efficacies of inocula on the startup of anaerobic reactors treating dairy manure under stirred and unstirred conditions
Biomass & bioenergy, Vol.35(7), pp.2705-2720
2011
Handle:
https://hdl.handle.net/2376/105858
Abstract
Inocula play an important role in anaerobic reactor startup by balancing the populations of
Syntrophobacter and methanogens. Such balances make syntrophic metabolism thermodynamically feasible in anaerobic digestion. In this study, the effect of inocula on the performance of dairy manure digestion was investigated by analyzing the change in volatile fatty acids (VFA), total solids (TS), volatile solids (VS), specific biogas production (SGPR), and specific methane production (SPMP) as well as scanning and transmission electron micrographs. The study was performed at four treatments. Treatment one was granular sludge (GM); treatment two was non-granular sludge (SM); treatment three was mixed culture from an anaerobic lagoon (LM); while the fourth treatment (the control denoted MM) did not receive any exogenous inocula. In addition, stirred and unstirred conditions were maintained in the reactors to determine their effect on reactor startup. Performance ranking based on the SGPR and SPMP of treatments (in descending order) was: GM, SM, LM and MM under stirred conditions. Under unstirred conditions, performance ranking (also in descending order) was: SM, GM, LM, and MM. Results of the examination of microcolonies in the granular, non-granular sludge, and dairy manure suggest that syntrophic juxtaposition of methanogens and
Syntrophobacter in granular inoculum was common while it was less visible in non-granular sludge, and completely absent in dairy manure.
► We investigated impacts of inocula on anaerobic reactor startup period. ► Reactor performance was evaluated under stirred and unstirred conditions at 35 °C. ► In stirred conditions, granular sludge performance was better than other inocula. ► In unstirred conditions, municipal sludge performance was better than other inocula. ► Anaerobic lagoon’s slurry did not improve reactor performance significantly.
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Details
- Title
- Efficacies of inocula on the startup of anaerobic reactors treating dairy manure under stirred and unstirred conditions
- Creators
- Pramod K Pandey - Department of Agricultural & Biosystems Engineering, Iowa State University, Ames, IA, 50011, USAPius M Ndegwa - Department of Biological Systems Engineering, Washington State University, Pullman WA, 99164 -6120, USAMichelle L Soupir - Department of Agricultural & Biosystems Engineering, Iowa State University, Ames, IA, 50011, USAJ. Richard Alldredge - Department Statistics,Washington State University, Pullman, WA 99164-3144, USAMarvin J Pitts - School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164-2920, USA
- Publication Details
- Biomass & bioenergy, Vol.35(7), pp.2705-2720
- Academic Unit
- Biological Systems Engineering, Department of; Mechanical and Materials Engineering, School of
- Publisher
- Elsevier Ltd
- Identifiers
- 99900546759301842
- Language
- English
- Resource Type
- Journal article