Department of Environmental Engineering, Peking University, the Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China.
Department of Environmental Engineering, Peking University, the Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China.
J Hazard Mater. 2010 Dec 15;184(1-3):493-498. doi: 10.1016/j.jhazmat.2010.08.062. Epub 2010 Aug 21.
Scale-up of boron-doped diamond (BDD) anode system is significant to the practical application of electrochemical oxidation in bio-refractory wastewater treatment. In this study, the performance of a smaller BDD anode (24 cm(2)) system in continuous mode electrochemical oxidation of phenol simulated wastewater was first investigated and well described by the response surface methodology (RSM). Furthermore, the RSM was extended to examine the scale-up feasibility of BDD anode systems with similar configurations. It was demonstrated that both COD degradation efficiency and specific energy consumption could be expected at the same level even as the system was enlarged over 100 times, which implied that BDD anode system could be successfully scaled up through controlling the same retention time, current density, initial COD, and conductivity conditions. Based on this study, a larger BDD anode (2904 cm(2)) system was constructed and systematic measurements were made on its performance in electrochemical oxidation of phenol simulated wastewater. Very good agreement was found between measured and predicted results by RSM. At the optimized conditions, the larger BDD anode system could easily reduce the COD of phenol simulated wastewater from 633 mg L(-1) to 145 mg L(-1) (<150 mg L(-1), National Discharge Standard of China) during 80 min with specific energy consumption only 31 kWh kgCOD(-1).
规模扩大硼掺杂金刚石（BDD）阳极系统是电化学氧化技术在生物难降解废水处理中的实际应用具有重要意义。本研究首次采用响应面法（RSM）对较小的 BDD 阳极（24cm2）系统在连续模式下电化学氧化苯酚模拟废水的性能进行了研究，并对其进行了很好的描述。此外，还扩展了 RSM 来考察具有相似结构的 BDD 阳极系统的放大可行性。结果表明，即使系统放大 100 多倍，COD 降解效率和比能耗仍可达到相同水平，这表明通过控制相同的停留时间、电流密度、初始 COD 和电导率条件，可以成功地对 BDD 阳极系统进行放大。基于本研究，构建了一个更大的 BDD 阳极（2904cm2）系统，并对其在电化学氧化苯酚模拟废水中的性能进行了系统的测量。RSM 预测的结果与测量结果非常吻合。在优化条件下，该更大的 BDD 阳极系统可在 80min 内将苯酚模拟废水的 COD 从 633mg/L 降低到 145mg/L（<150mg/L，中国国家排放标准），比能耗仅为 31kWh/kgCOD。
