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Effluent COD levels ranged from 27 to 120 mg/L, with an average removal efficiency of over 93% (Figure 3). Table 2 summarizes the influent and effluent characteristics from the BCR test period. As can be seen, concentrations of COD in the influent fluctuated considerably during the study period. The COD of permeate, in turn, was a relatively constant value that stabilized around 40 mg/L after the first two weeks of operation.
Table 2

Influent and effluent characteristics during the test period

 CODNH4-NTN
Infl. average (mg/L) 498 135 174 
Infl. range (mg/L) 213–812 72.4–232 98–297 
Effl. average (mg/L) 40.2 67.3 110.5 
Effl. range (mg/L) 27.2–119 35.3–132 65.6–202 
Removal efficiency (%) 93a – 37 
 CODNH4-NTN
Infl. average (mg/L) 498 135 174 
Infl. range (mg/L) 213–812 72.4–232 98–297 
Effl. average (mg/L) 40.2 67.3 110.5 
Effl. range (mg/L) 27.2–119 35.3–132 65.6–202 
Removal efficiency (%) 93a – 37 

aCalculated on actual in/out data pairs.

Figure 3

Influent and effluent COD concentrations during the experimental period.

Figure 3

Influent and effluent COD concentrations during the experimental period.

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