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Applicability of coagulation/flocculation and electrochemical processes to the purification of biologically treated vinasse effluent

机译：混凝/絮凝和电化学过程在生物处理酒糟废水净化中的适用性

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We investigated the use of coagulation/flocculation (CF) and electrochemical oxidation (EO) processes to purify vinasse that had already been biologically treated (vinasse BT). The CF process was analyzed as a function of the concentration of the coagulant (FeCl3) and the pH of the vinasse BT. After the CF process, EO was performed by potentiostatic electrolysis with a Ti/RuPb(40%)O_x anode and Ti/PtPd(10%)O_x cathode. The EO process was analyzed as a function of pH of vinasse CF treated and electrolysis time. The efficiencies of the CF and OE treatments on the vinasse BT were quantified in terms of the removal of chemical oxygen demand (COD), color and turbidity. The experimental results showed that the CF process with a coagulant concentration of 20 g/L and a pH of 8.4 removes a significant amount of COD (84%), color and turbidity (~99%). The subsequent EO step satisfactorily complemented the purification of vinasse BT by CF, yielding removal efficiencies of more than 95% for COD and on the order of 100% for color and turbidity. We suggest that the mineralization via electrochemistry took place by indirect oxidation, mediated by active chlorine derived from FeCl3 added during the CF treatment step.
机译：我们研究了使用混凝/絮凝（CF）和电化学氧化（EO）工艺纯化已经过生物处理的酒糟（vinasse BT）。分析CF过程与凝结剂（FeCl3）浓度和酒糟BT的pH的关系。在CF工艺之后，使用Ti / RuPb（40％）O_x阳极和Ti / PtPd（10％）O_x阴极通过恒电位电解进行EO。分析了EO工艺与处理的酒糟CF的pH和电解时间的关系。通过去除化学需氧量（COD），颜色和浑浊度，可以量化CF和OE处理酒糟BT的效率。实验结果表明，混凝剂浓度为20 g / L，pH值为8.4的CF工艺可去除大量的COD（84％），颜色和浊度（〜99％）。后续的EO步骤令人满意地补充了CF对酒糟BT的纯化，对COD的去除效率超过95％，对于颜色和浊度的去除效率约为100％。我们建议通过电化学的矿化是通过间接氧化发生的，间接氧化是由CF处理步骤中添加的FeCl3衍生的活性氯介导的。

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