BACKGROUND: Electrochemical oxidation has attracted wide attention in wastewater treatment because of its strong oxidation performance and ease of control. This work investigated the feasibility of electrochemical treatment using a Ti/RuO 2 -IrO 2 anode as an advanced treatment of coking wastewater. The influential operating factors including current density (9.6-108.2 mA cm −2 ) and electrode gap (0.5-2.5 cm) were evaluated.
RESULTS: The current density and electrodes gap had significant effects on COD and NH4 + -N removal and the energy consumption. The degradation of COD and NH 4 + -N followed pseudo-first-order kinetics. In most experiments, high levels of NH 4 + -N removal (NH 4 + -N removal ratio > 95%) was achieved along with moderate mineralization (COD removal ratio: 60-80%). COD (178.0-285.0 mg L -1 ) and NH 4 + -N (55.0-76.0 mg L -1 ) were degraded by 62% and 96%, respectively, at the optimum conditions (electrode gap: 0.5 cm, current density: 15.6 mA cm −2 ) after 60 min treatment. Under this optimal condition, the corresponding energy consumption was 8.60 kWh m -3 for effluent meeting the discharge standards. Furthermore, gas chromatography-mass spectrometry (GC-MS) analysis indicated that this technique could be employed to eliminate bio-refractory and toxic compounds such as phenanthrene, indole, quinoline and pyrimidine in coking wastewater. CONCLUSION: Ti/RuO 2 -IrO 2 anode systems were confirmed to be effective in advanced treatment of biologically pretreated coking wastewater. NOTATION E S Energy consumption (kWh m −3 ) U Average cell voltage (V) I Applied current (A) T Electrolysis time (h)
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