Efficient degradation of biologically treated citric acid wastewater in a continuous-flow three-dimensional electrode reactor
In this study, we constructed a continuous-flow three-dimensional electrode reactor (CTDER) to remove organic compounds from biologically-treated citric acid wastewater.We analyzed the effects of the residence time, current density, initial pH, and airflow rate on the reactors energy consumption (Es), general current efficiency (GCE), and ability to remove the chemical oxygen demand (COD).We determined that the optimal operation conditions for the reactor included a residence time of 5 min, a current density of 40 mA cm-2, and an initial pH of 5.Under these conditions, we determined that 55.7% of COD was removed.The resulting COD of the effluent was within the National Discharge Standard of China (COD < 100 mg L-1), and the Es and GCE were 274.8 kWh kgCOD-1 and 16.2%, respectively.We also found that aeration in the CTDER negatively affected COD removal due to the short-circuiting of the fluid.Further investigation revealed that the CTDER could produce a steady effluent quality where the organic compounds were degraded primarily via the indirect electrochemical oxidation of humic acid-like substances in the citric acid wastewater.Our results demonstrate that the CTDER is a highly efficient system for the electrochemical treatment of biologically-treated citric acid wastewater.
Secondary industrial effluent Continuous-flow mode Ti/RuO2-IrO2-TiO2-SnO2 anode Granular activated carbon
LI Xin-yang Zhu Wei WANG Cheng-wen QIAN Yi
School of Environment, Tsinghua University, Beijing, 100084, China
国际会议
北京
英文
216-217
2013-11-07（万方平台首次上网日期，不代表论文的发表时间）