Gatsios Evangelos, Hahladakis John N, Gidarakos Evangelos
School of Environmental Engineering, Technical University of Crete, Politechnioupolis, Chania 73100, Greece.
J Environ Manage. 2015 May 1;154:117-27. doi: 10.1016/j.jenvman.2015.02.018. Epub 2015 Feb 23.
In the present work, the efficiency evaluation of electrocoagulation (EC) in removing toxic metals from a real industrial wastewater, collected from Aspropyrgos, Athens, Greece was investigated. Manganese (Mn), copper (Cu) and zinc (Zn) at respective concentrations of 5 mg/L, 5 mg/L and 10 mg/L were present in the wastewater (pH=6), originated from the wastes produced by EBO-PYRKAL munitions industry and Hellenic Petroleum Elefsis Refineries. The effect of operational parameters such as electrode combination and distance, applied current, initial pH and initial metal concentration, was studied. The results indicated that Cu and Zn were totally removed in all experiments, while Mn exhibited equally high removal percentages (approximately 90%). Decreasing the initial pH and increasing the distance between electrodes, resulted in a negative effect on the efficiency and energy consumption of the process. On the other hand, increasing the applied current, favored metal removal but resulted in a power consumption increase. Different initial concentrations did not affect metal removal efficiency. The optimal results, regarding both cost and EC efficiency, were obtained with a combination of iron electrodes, at 2 cm distance, at initial current of 0.1 A and pH=6. After 90 min of treatment, maximum removal percentages obtained were 89% for Mn, 100% for Cu and 100% for Zn, at an energy consumption of 2.55 kWh/m(3).
在本研究中，对来自希腊雅典阿斯普罗皮尔戈斯的实际工业废水进行电凝聚（EC）去除有毒金属的效率评估进行了调查。该废水（pH = 6）中存在浓度分别为5 mg/L、5 mg/L和10 mg/L的锰（Mn）、铜（Cu）和锌（Zn），废水源自EBO - PYRKAL弹药工业和希腊石油埃莱夫西斯炼油厂产生的废物。研究了电极组合与间距、施加电流、初始pH值和初始金属浓度等操作参数的影响。结果表明，在所有实验中Cu和Zn均被完全去除，而Mn的去除率同样很高（约90%）。降低初始pH值和增加电极间距会对该工艺的效率和能耗产生负面影响。另一方面，增加施加电流有利于金属去除，但会导致功耗增加。不同的初始浓度对金属去除效率没有影响。在成本和EC效率方面，最佳结果是采用铁电极组合，间距为2 cm，初始电流为0.1 A且pH = 6时获得的。处理90分钟后，Mn的最大去除率为89%，Cu为100%，Zn为100%，能耗为2.55 kWh/m³。
