Chang Jih-Hsing, Yang Tsong-Jen, Tung Cheng-Hung
Department of Environmental Engineering and Management, Chaoyang University of Technology, Wufong, Taichung County 41349, Taiwan.
J Hazard Mater. 2009 Apr 15;163(1):152-7. doi: 10.1016/j.jhazmat.2008.06.072. Epub 2008 Jun 27.
This research is intended to decompose organic substances in municipal wastewater with nano- and nonnano-scale electrocatalytic electrodes. As an anode, the nano-scale electrodes included lab-made TiO(2) and Cu(2)O electrodes; the nonnano-scale electrodes were a commercial TiO(2) and graphite plate. According to experimental results, the nano- and nonnano-scale catalytic electrodes can effectively remove the organic pollutants in the municipal wastewater. The perforated TiO(2) electrode is the best for eliminating the chemical oxygen demand (COD), and its efficiency is about 90% (COD decreases from 400 to 40 mg L(-1)). The conductivity of municipal wastewater and the electro-catalytic process will increase the pH and eventually remains in the neutral range. The conductivity of municipal wastewater can be lowered to some degrees. The most attractive discovery of electro-catalytic process is that the dissolved oxygen (DO) in the municipal wastewater can be increased by the TiO(2) electrode (nonnano-scale) around 4-6 mg L(-1), but few DO is produced by the nano-scale electrocatalytic electrode.
本研究旨在利用纳米级和非纳米级电催化电极分解城市废水中的有机物质。作为阳极，纳米级电极包括实验室自制的TiO₂和Cu₂O电极；非纳米级电极是商用TiO₂和石墨板。根据实验结果，纳米级和非纳米级催化电极能够有效去除城市废水中的有机污染物。多孔TiO₂电极在消除化学需氧量（COD）方面效果最佳，其效率约为90%（COD从400降至40 mg L⁻¹）。城市废水的电导率以及电催化过程会使pH值升高，最终保持在中性范围内。城市废水的电导率能在一定程度上降低。电催化过程最引人注目的发现是，非纳米级TiO₂电极可使城市废水中的溶解氧（DO）增加约4 - 6 mg L⁻¹，而纳米级电催化电极产生的DO很少。
