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Table 3 shows that under the respective optimum conditions, the energy consumption of PE is much lower than that of DE, and the PE process could save 76% of the energy relative to the DE process. There is no obvious difference in specific iron electrode consumption and sludge yield in these two processes.

Table 3

Comparison of DE and PE regarding electrode consumption, energy consumption, and sludge yield

ItemDEPE
Electrode consumption (kg Fe/kg CODremoved3.4 3.1 
Energy consumption (kWh/kg CODremoved0.78 0.19 
Sludge yield (kg/kg CODremoved5.5 5.3 
ItemDEPE
Electrode consumption (kg Fe/kg CODremoved3.4 3.1 
Energy consumption (kWh/kg CODremoved0.78 0.19 
Sludge yield (kg/kg CODremoved5.5 5.3 

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.

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