Tequila vinasses acidogenesis in a UASB reactor with Clostridium predominance.

A clear trend in pH reduction is shown when diminishing HRT from 36 to 6 h (Table 1 ) achieving a pH = 6.48 with HRT = 6 h, although a lower figure (pH = 6.29) was observed with OLR = 30 g COD L −1 d −1 .

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During phase X, HRT was kept at 6 h and OLR increased to 20 g COD L −1 d −1 which led to an average pH of 6.6 and after a recovery of 64%, COD removal showed a trend to diminish down to 35% at day 112.

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