Fig. 7.

Conversion of ethanol 14 mM in the experiment conducted at pH 6.1. Panels show the ethanol concentration (A); acetate concentration (B); and, CH4 production (C). The complete treatment containing inoculum, AsV, SO42− and ethanol (●); Inoculum ,SO42− and ethanol (x), Inoculum AsV and ethanol (◇), inoculum and SO42− (◆), inoculum and AsV (Δ), inoculum and ethanol (+); Sterile controls with AsV and ethanol (◯), the sterile control with SO42− and ethanol (▲) and the sterile control with SO42−, AsV and ethanol (□). Treatments lacking ethanol addition (with zero values over the time course of the experiment) are not shown.