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Fig. 3.7 Methane production yield achieved from the sequential methane production in batch

experiment at the end of the 27 days of fermentation.

Table 3.10 Soluble metabolite products achieved from methane production in batch experiment

at the end of the 27 days of fermentation.

Treatments Initial pH Final pH Acetate (mM) Propionate Butyrate
(mM) (mM)
Blank solution* 7.34±0.01 7.47±0.03 ND 1.48±0.05 ND
SLS* 7.24±0.02 7.49±0.01 ND 7.78±0.17 2.34±0.43
POME* 7.06±0.01 7.52±0.01 6.63±0.58 1.27±0.03 ND
SLS:POME 55:45 (%v/v)* 7.15±0.02 7.48±0.01 11.26±0.32 1.86±0.01 1.66±0.38
Acetate control 7.55±0.02 7.76±0.01 0.65±0.06 ND ND
*Used effluent withdrawn from related BHP stage as substrate

ND = Non-detectable