Page 458 - Industrial Wastewater Treatment, Recycling and Reuse

428 Industrial Wastewater Treatment, Recycling, and Reuse

300 0.4

0.35
250 0.3
Methane generated (L/day) 150 Actual methane generated 0.25 Methane yield (m 3 /kg COD removed)
200

0.2

0.15
Theoretical expected methane
100
Methane yield
50 generation 0.1
0.05

0 0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85
Days of operation
Figure 10.19 Actual methane generation, theoretical methane generation, and
observed methane yield as a function of time.

MLSS and MLVSS in the bioreactor (mg/L) 12,000 MLSS in the bioreactor

10,000

8000

6000

4000

2000

0 MLVSS in the bioreactor
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85
Days of operation
Figure 10.20 The concentrations of MLSS and MLVSS maintained in the bioreactor
during performance evaluation.

bioreactor was maintained at 300 days by draining 1.84 L of bioreactor con-
tent on a daily basis. As indicated in Figure 10.20, MLSS in the bioreactor
was maintained in the range from 9682 to 11,410 mg/L with an average
MLSS of 10,635 mg/L. The average MLVSS maintained in the bioreactor