Effects of Operating Parameters on Electrochemical Treatment of Swine Wastewater

摘要

This study focuses on the electrochemical treatment of swine wastewater under different parameters(anode material, cathode distance, cathode area, and wastewater volume). The results showed that for atotal of 16 tests, the pseudo-first-order COD and NH 3 -N removal rate constants ranged from 9.00×10 -5 ?5.98×10 -4 and 5.66×10 -5 ?1.45×10 -3 1/s, respectively, with removal efficiencies of 79%?100% and72%?100%, respectively. The range of specific energy consumption (E SP ) was 32?358 kWh/kg-COD.The performance of a lab-prepared boron-doped diamond (BDD) anode was comparable to that of acommercial anode for the electrochemical removal of COD and NH 3 -N in swine wastewater. Amongtested anode materials, IrO 2 /Ta 2 O 5 exhibited the lowest performance in terms of COD and NH 3 -Nremoval, and BDD showed better COD degradation performance than PbO 2 although an opposite trendwas observed for NH 3 -N removal. The COD and NH 3 -N removal efficiencies increased as theelectrode distance increased. Increasing the cathode area also increased the removal efficiency ofpollutants and was beneficial for controlling the final pH. Of all the tests, the lowest E SP (32 kWh/kg-COD) was obtained by increasing the wastewater volume and lowering the current density, which canbe considered for energy or cost savings related to operation.