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Table 2 lists the effluent values of various parameters in the AFPW for DE, PE and CC processes under respective optimized conditions. It can be observed that only the effluent quality of PE treatment could meet the national discharge standard of China, the COD and O&G levels of DE treatment exceed the discharge limits, whereas only the TSS concentration reaches the discharge standard for CC. These results demonstrated that PE treatment has higher treatment efficiency than DE and CC processes towards the AFPW.

Table 2

Performance comparison of DE, PE and CC processes

ParameterEffluent value
Removal (%)
Discharge standarda
DEPECCDEPECC
COD (mg/L) 226 72 860 94.7 98.3 79.8 ≤100 mg/L 
O&G (mg/L) 5.9 1.6 25.7 96.2 99.0 83.5 ≤5 mg/L 
Turbidity (FTU) 10.5 3.7 28.3 96.9 98.8 91.1 ≤15 FTU 
TSS (mg/L) 10.1 4.3 17.5 95.5 98.1 92.2 ≤20 mg/L 
PAM (mg/L) 44.2 18.8 71.6 86.6 94.3 78.3 – 
ParameterEffluent value
Removal (%)
Discharge standarda
DEPECCDEPECC
COD (mg/L) 226 72 860 94.7 98.3 79.8 ≤100 mg/L 
O&G (mg/L) 5.9 1.6 25.7 96.2 99.0 83.5 ≤5 mg/L 
Turbidity (FTU) 10.5 3.7 28.3 96.9 98.8 91.1 ≤15 FTU 
TSS (mg/L) 10.1 4.3 17.5 95.5 98.1 92.2 ≤20 mg/L 
PAM (mg/L) 44.2 18.8 71.6 86.6 94.3 78.3 – 

aChinese discharge standard for water pollutants (GB18918-2002). DE conditions: current density, 10 mA/cm2; electrode distance, 1.0 cm; electrolysis time, 25 min. PE conditions: pulse duty cycle, 0.3; current density, 35 mA/cm2; pulse frequency, 3.0 kHz; electrode distance, 1.0 cm; electrolysis time, 40 min. CC conditions: PFS dosage, 0.5 g/L.

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