Table 2.

The primary parameters for the whole process of enriching PHA-producing MMC fed by valerate-dominant sludge hydrolysate with increasing initial concentrations.

Cycle	SCOD (mg/L)	Feast phase (h)	CDW (g/L)	Maximum PHA content (%)	PHA concentration (g/L)
1~7	500	9	0.92	5.00	0.05
8~16	1000	12	1.66	8.74	0.15
17~26	2000	18	2.02	16.70	0.34
27~35	3000	18	2.30	23.94	0.55
36~47	4000	21	2.96	33.69	1.00
48~60	6000	24	2.88	38.69	1.11
61~75	8243	24	3.08	42.34	1.30

The results of ‘feast phase’, ‘CDW’, ‘maximum PHA content’ and ‘PHA concentration’ are the average of the last three batches for each concentration. ‘CDW’ and ‘PHA concentration’ indicate the values at the end of feast phase.