Mavros Michael, Xekoukoulotakis Nikolaos P, Mantzavinos Dionissios, Diamadopoulos Evan
Department of Environmental Engineering, Technical University of Crete, GR-73100 Chania, Crete, Greece.
Water Res. 2008 Jun;42(12):2883-8. doi: 10.1016/j.watres.2008.02.026. Epub 2008 Mar 4.
A battery scheme comprising sequential alum coagulation, activated-carbon adsorption and electrochemical oxidation over boron-doped diamond electrodes to mineralize a leachate from olive pomace processing is demonstrated. The effect of coagulant and adsorbent concentration on treatment efficiency was assessed in the range 0.1-50 mM Al(3+) and 2.5-50 g/L activated-carbon and optimal conditions were established. Coagulation at 7.5mM Al(3+) resulted in substantial solids and color removal (i.e. 80% and 93%, respectively). This was accompanied by only 30% chemical oxygen demand (COD) reduction (initial COD was about 3,500 mg/L). The latter increased to 80% though when coagulation was coupled with adsorption at 25 g/L activated carbon. Electrochemical oxidation of the original effluent for 360 min led to 63% and 82% COD reduction at 10 and 20A current intensity, respectively. When this process was tested as a polishing stage following coagulation and adsorption, overall COD removal reached values of 92% and 97%, respectively. The final effluent was also colorless and solids free. However, the treated effluent still exhibited ecotoxicity possibly due to the formation of ecotoxic oxidation products.
展示了一种电池方案，该方案包括顺序进行的铝盐混凝、活性炭吸附以及在掺硼金刚石电极上的电化学氧化，以实现橄榄果渣加工渗滤液的矿化。评估了混凝剂和吸附剂浓度在0.1 - 50 mM Al(3+)和2.5 - 50 g/L活性炭范围内对处理效率的影响，并确定了最佳条件。在7.5 mM Al(3+)下进行混凝可实现大量的固体和颜色去除（分别为80%和93%）。这仅伴随着30%的化学需氧量（COD）降低（初始COD约为3500 mg/L）。不过，当混凝与25 g/L活性炭吸附相结合时，后者提高到了80%。对原废水进行360分钟的电化学氧化，在10 A和20 A电流强度下分别导致63%和82%的COD降低。当该过程作为混凝和吸附后的抛光阶段进行测试时，总的COD去除率分别达到了92%和97%。最终出水也无色且无固体。然而，处理后的出水仍表现出生态毒性，这可能是由于形成了具有生态毒性的氧化产物。
