Using enriched cultures for elevation of anaerobic syntrophic interactions between acetogens and methanogens in a high-load continuous digester
2010; Elsevier BV; Volume: 102; Issue: 4 Linguagem: Inglês
10.1016/j.biortech.2010.11.111
ISSN1873-2976
AutoresT. Amani, Mohsen Nosrati, Seyyed Mohammad Mousavi,
Tópico(s)Biofuel production and bioconversion
ResumoVolatile fatty acids (VFAs) are key intermediates in anaerobic digestion. Enriched acetogenic and methanogenic cultures were used for syntrophic anaerobic digestion of VFAs in a high-load continuous reactor fed with acetic (HAc), propionic (HPr) and butyric (HBu) acids at maximum concentrations of 5, 3 and 4 g/L, respectively. Interactive effects of HPr, HBu and HAc were analyzed. Furthermore, hydraulic retention time (HRT) and methanogen to acetogen population ratio (M/A) were investigated as key microbiological and operating variables of VFA anaerobic degradations. Optimum conditions were found to be HPr=1125.0mg/L, HBu=1833.4 mg/L, HAc=1727.4 mg/L, HRT=21 h and M/A=2.5 (corresponding to maximum VFA removal and biogas production rate (BPR)). Results of verification experiments and predicted values from fitted correlations were in close agreement at 95% confidence interval. HRT and M/A had positive effects on VFA removal and BPR. M/A was the most important factor that affected BPR. All VFAs inhibited VFA removals.
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