Table 2. Comparison of Average Energy Consumption () of This Study with the Other Electrochemical Oxidation Processes.

reactors	electrodes/oxidant species	electrolysis channels	wastewater/treatment capacity (L)	other experimental condition	RE and	reference
differential column batch reactor	anode: boron-doped diamond (BDD), cathode: stainless steel electrode; Cl2/OCl–	1	ultrafiltration effluent of landfill leachate/0.4	initial COD = 600 mg/L, flow velocity = 5.6 cm/s, electrode area = 50.0 cm2, reaction time = 12 h, current density = 1–80 mA/cm2	RECOD = 88.3%, = 135.1 kWh/(kg COD)	(27)
joint electrochemical system	anode: iron or Ti/RuO2, cathode: Cu/Zn; Cl2/OCl–	1	biologically treated landfill leachate/0.3	initial COD = 2237.5 mg/L, flow rate = 40 mL/min, reaction time = 4 h, electrode area = 51.6 cm2, current density = 30–70 mA/cm2	RECOD = 90.2%, = 1091.3 kWh/(kg COD)	(41)
flow sequencing batch reactor	anode: Ti/BDD, cathode: Pt; Cl2/OCl–/•OH	1	biologically landfill leachate/0.05	initial COD = 3308–3540 mg/L, wastewater volume = 50 mL, flow rate = 50 L/h, reaction time = 4–8 h, electrode area = 6 cm2, current density = 83 mA/cm2	RECOD = 95%, = 110 kWh/(kg COD)	(35)
semipilot plant operating in batch mode with recirculation	anode: BDD, cathode: carbon-felt; Cl2/OCl–/•OH	1	RO leachate concentrate/10	initial COD = 9900 mg/L, flow rate = 500 L/h, reaction time = 8 h, electrode area = 70 cm2, current density = 4.3 mA/cm2	RECOD = 34%, = 58 kWh/(kg COD)	(26)
multichannel flow reactor	anode: RuO2/IrO2 coated Ti plates, cathode: 304 stainless steel plates; Cl2/OCl–	6	RO leachate concentrate/2.5	initial COD = 3414.7 mg/L, circulating velocity = 0.44 cm/s, reaction time = 3 h, electrode area = 380 cm2 × 6, current density = 10.96 mA/cm2	RECOD = 96%, = 41 kWh/(kg COD)	this study