Biohydrogen production from Tequila vinasses in an anaerobic sequencing batch reactor: Effect of initial substrate concentration, temperature and hydraulic retention time

Review – Biogas Technology to Treat Bioethanol Vinasse

“…Biogas production at 35 o C and 12-h HRT is 2590 mL, while at 35 o C and 24-h HRT is 3200 mL. Furthermore, Buitron and Carvajal [29] stated that using HRT 24-h at both temperature (25 and 35 o C), methane is up to 35-44%.…”

“…Buitron and Carvajal [29] studied the influence of substrateconcentration, temperature and HRT using batch reactor. The variation of substrate concentration is 0.5, 1, 2, 3 gram COD/L; the variation of temperature is 25 and 35 o C; the variation of HRT is 12 and 24 hours.…”

“…Buitron and Carvajal [29] reported that biogas production from vinasse at temperature of 35 o C is more than at temperature of 25 o C. Fermentation process at 25 o C produces more acetone and ethanol than that of 35 o C. Whereas, fermentation carried out at 35 o C produces VFAs (acetic, propionic, butyric, iso-butyric acids) in large amount. Espinoza-Escalante et al [27] also gets same conclusion that optimum temperature condition to produce methane is 35 o C (mesophilic temperature).…”

“…Buitron and Carvajal [29] did combination variables between temperature and HRT using a sequencing batch reactor. At 25 o C and 12-h HRT, biogas is not produced.…”

“…In fermentation step, feed (raw materials of bioethanol) is inoculated with 10% by volume of Saccharomyces cereviseae. The process is operated under anaerobic condition, with range temperature of 25-32 o C, during [24][25][26][27][28][29][30][31][32][33][34][35][36] hours, efficiency of 95%. Some units of spray cooling water are on the walls of fermenter to maintain temperature constant in the range, because of its exothermic reaction.…”