... degradation and organic acids production almost ceased as hydrogen production ended up. In most cases, n-butyrate was produced simultaneously with hydrogen production. Simultaneous n-butyrate production ... Wat. Res., 34(5), 1705-1713. Mitchell, W. J., 2001. Biology and physiology. In: Bahl, H. and Pűrre, P., Clostrida: Biotechnology and medical applications. Weinheim, Germany: Wiley-VCH, pp. 53-68. ... soluble defined substrates, hydrogen production yield and major byproduct were 0.7-2.1 mole/hexoseconsumed and n-butyrate, respectively (Mizuno et al., 2000; Fang and Liu, 2002). However, hydrogen...