Tezcan Un Umran, Onpeker Suzan Eroglu, Ozel Emel
Anadolu University, Department of Environmental Engineering, 26555 Eskisehir, Turkey.
Graduate School of Sciences, Anadolu University, 26555 Eskisehir, Turkey.
J Environ Manage. 2017 Sep 15;200:196-203. doi: 10.1016/j.jenvman.2017.05.075. Epub 2017 Jun 1.
This research experimentally investigates the treatment of authentic electroplating wastewater with high Cr(VI) content by electrocoagulation with the obtained sludge being reused as a raw material to produce inorganic pigments. A zero waste process is introduced to help conserve resources and to minimize environmental effects. The effects of operational parameters on electrocoagulation are determined in a batch stirred reactor using an iron electrode. The best performance was observed when a current density 20 mA/cm, pH 2.4 and 0.05 M NaCl electrolyte were maintained. The initial Cr(VI) concentration of 1000 mg/L was almost completely abated (∼100%) at an energy cost of 2.68 kWh/m, fulfilling the EPA guideline of 2.77 mg/L within a single step process. The sludge was characterized using XRD and XRF showing that the sludge is a rich source of iron and chromium and can be reused to produce value added ceramic pigments. Pigments prepared in this way appeared to be reddish brown and black color in transparent glaze and were also characterized using XRD and XRF. In this study, a zero waste process is successfully introduced with ∼100% Cr(VI) removal, with subsequent reuse of the resulting sludge.
本研究通过电凝聚实验研究了高铬（VI）含量的实际电镀废水的处理方法，所得污泥作为原料再利用以生产无机颜料。引入了零废物工艺以帮助节约资源并尽量减少环境影响。在使用铁电极的间歇搅拌反应器中确定操作参数对电凝聚的影响。当维持电流密度20 mA/cm、pH 2.4和0.05 M NaCl电解质时，观察到最佳性能。初始铬（VI）浓度为1000 mg/L时，在能量消耗为2.68 kWh/m的情况下几乎完全去除（约100%），在单步过程中符合美国环境保护局2.77 mg/L的指导方针。使用X射线衍射（XRD）和X射线荧光光谱（XRF）对污泥进行表征，结果表明该污泥富含铁和铬，可再利用以生产增值陶瓷颜料。以这种方式制备的颜料在透明釉中呈现红棕色和黑色，也使用XRD和XRF进行了表征。在本研究中，成功引入了零废物工艺，铬（VI）去除率约为100%，随后对所得污泥进行再利用。
