Page 424 - Industrial Wastewater Treatment, Recycling and Reuse

396 Industrial Wastewater Treatment, Recycling, and Reuse

performance for COD reduction, turbidity, power consumption, and other
performance parameters. Submerged module testing was done with simulated
water in the lab. Simulated wastewater prepared showed 850 mg/L COD and
359 mg/L BOD as given in Table 9.10. Simulated wastewater was fed into the
biological system, which had a membrane module inside. The module was
operated at a specific operating condition at controlled flux. The quality of
MBR product was excellent, as shown in Table 9.11. The turbidity achieved
was always <0.1 NTU and COD and BOD reduction was more than 97%.
Figure 9.16 shows the performance of the membrane with respect to flux
and indicates the consistent flux under the given operating conditions.

Table 9.10 Influent water (Simulated Wastewater) characteristics for submerged MBR
trial
Sr. No Parameters Unit Value

1 pH 7.05
2 COD mg/lit 850
3 BOD mg/lit 359
4 Alkalinity mg/lit 60

Table 9.11 Product Effluent water characteristics
Sr. No Parameters Unit Value
1 pH 6.87
2 COD mg/lit <20
3 BOD mg/lit <10
4 Alkalinity mg/lit 50
5 Turbidity NTU <0.1

Submerged Flux
MBR operation at fixed flux Prod. turbidity
18.0 0.50
17.0 0.45
0.40
Flux(lmh) 16.0 0.35 Prod. turbidity(NTU)
15.0
0.30
14.0
0.25
13.0
0.20
12.0
0.15
11.0 0.10
10.0 0.05
0 20 40 60 80 100 120 140 160 180 200
Time (h)
Submerged MBR performance
Figure 9.16 Submerged MBR performance.