Toward sustainable dairy waste utilization: enhanced VFA and biogas synthesis via upcycling algal biomass cultured on waste effluent
作者： Simon A Smith , Eric Hughes , Erik R Coats , Cynthia K Brinkman , Armando G McDonald
DOI: 10.1002/JCTB.4706
关键词:
摘要: BACKGROUND In 2012, 9.3 million head of dairy cows in the USA produced an estimated 20 metric tons manure solids, but little value was gained from this manure. There is a pressing need to enhance resource recovery efforts, as has potentially significant environmental impacts. This study evaluated components integrated suite biological processes designed maximize manure, which algae grown on polyhydroxyalkanoate (PHA) production effluent (PHA-algae) were fermented and anaerobically digested determine process impacts. RESULTS A 10% PHA-algae supplement 11% more volatile fatty acids (VFA) during fermentation methane anaerobic digestion (AD) (vs. manure); biogas also contained higher percentage (62.7 vs. 59.1%) than biogas. Algal augmentation exhibited no negative effect fermenter or AD operation. Quantitative polymerase chain reaction (PCR) showed that ADs substantial populations both acetoclastic hydrogenotrophic methanogens, which, given heterogeneous substrate, enhanced stability. differences between batches, large quantities COD released freezing. CONCLUSION PHA-algae yielded VFA fermentation, methane-rich following A caused disturbance normal flora. © 2015 Society Chemical Industry
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