Table 2.

Concentrations of volatile fatty acid (VFA) and content of total solid (TS) and volatile solid (VS)

Sampling time	Sample location	TS (%)	VS (%)	VFA concentration (mM)						Total VFA (mM)
				Acetic Acid	Propionic acid	Isobutyric acid	Butyric acid	Isovaleric acid	Valeric acid
8/3/2011	I	3.2	2.4	32.55	7.63	0.49	4.37	2.33	7.65	55.01
	T1	3.3	2.5	2.96	0.60	0.00	0.47	0.27	2.84	7.14
	T2	3.3	2.4	8.47	0.92	0.00	0.34	0.19	1.93	11.85
	T3	2.6	2.0	10.28	0.74	0.00	0.29	0.08	1.34	12.74
	E	2.8	2.1	10.65	0.30	0.00	0.28	0.00	1.26	12.49
9/15/2011	I	7.4	6.1	18.36	9.88	1.00	3.60	1.27	2.52	36.63
	T1	2.9	2.1	9.53	0.53	0.00	0.35	0.10	0.89	11.40
	T2	3.7	2.8	9.12	0.27	0.00	0.24	0.00	0.68	10.31
	T3	3.1	2.2	9.61	1.69	0.00	0.24	0.00	0.64	12.18
	E	3.3	2.4	10.93	0.31	0.00	0.31	0.08	0.76	12.39
9/30/2011	I	13.7	11.6	29.22	5.73	0.31	2.37	0.62	1.09	39.35
	T1	4.1	3.0	8.86	0.84	0.06	0.52	0.11	0.58	10.97
	T2	4.0	2.9	11.87	0.55	0.00	0.36	0.08	0.53	13.38
	T3	2.7	1.8	10.16	0.31	0.00	0.24	0.00	0.47	11.17
	E	3.9	2.8	9.04	0.30	0.00	0.29	0.00	0.39	10.01