Inhibitory Effect of Long-Chain Fatty Acids on Biogas Production and the Protective Effect of Membrane Bioreactor

Table 1

Total VFA concentration on the last day of the experiment in the reactors with the free cells and the MBR with the encased cells containing different LCFAs at different concentrations.

LCFAs	Conc. (g/L)	⁢Total VFA concentration (g/L)
		Free cells	Encased cells
Palmitic acid	0	2.1 ± 0.6	2.4 ± 0.1
	1.5	2.5 ± 0.0	2.6 ± 0.0
	3.0	2.6 ± 0.0	2.8 ± 0.2
	4.5	3.2 ± 0.0	2.8 ± 0.1
Stearic acid	0	2.6 ± 0.5	1.8 ± 0.1
	1.5	2.7 ± 0.1	1.9 ± 0.0
	3.0	4.4 ± 0.1	2.6 ± 0.0
	4.5	5.4 ± 0.2	2.4 ± 0.0
Oleic acid	0	4.0 ± 0.5	3.4 ± 1.1
	1.5	4.6 ± 0.5	3.8 ± 0.1
	3.0	4.5 ± 0.1	4.0 ± 0.4
	4.5	5.1 ± 0.2	4.2 ± 1.2

Not significantly different from control.
Significantly different from the control, , .