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A comparison of coagulant dosing options for the remediation of molasses process water

机译：糖蜜工艺用水修复中的混凝剂量选择比较

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Effluents arising from molasses fermentation are highly coloured and carry a large organic load.Existing anaerobic/aerobic biological treatments effectively reduce the biological oxygen demand(BOD),but are unable to decolourise or remove the colour associated chemical oxygen demand(COD)from the wastewaters.This study investigated the remediation efficacy of chemical flocculation and electrocoagulation,the process whereby sacrificial anodes corrode to release active coagulant precursors into solution.The chemical flocculants used Al_s(SO4)2 and FeCl3 have an optimum dosage concentrations,above and below which they are less effective.Both removed almost 90% of the colour and up to 80% of the COD,although this was dependant on effluent quality.Altering the pH alone was also shown to cause colour removal.Electrocoagulation using sacrificial iron or aluminium anodes was as effective as chemical flocculation in reducing colour and COD.The bubbles of hydrogen from the cathode floated almost all the coagulated material to the surface of the reactor,facilitating separation.Particle size distributions of the treated wastewater were measured by laser diffraction.The volume-based frequency distribution made it clear that both chemical flocculation and electrocoagulation resulted in considerable aggregation.A linear relationship between colour and COD removal was demonstrated.
机译：糖蜜发酵产生的废水色泽高，并带有大量有机物。现有的厌氧/好氧生物处理能有效降低生物需氧量（BOD），但不能使废水脱色或去除与颜色相关的化学需氧量（COD）。本研究研究了化学絮凝和电凝的修复功效，即牺牲阳极腐蚀将活性凝结剂前体释放到溶液中的过程.Al_s（SO4）2和FeCl3所使用的化学絮凝剂的最佳剂量浓度为高于或低于此浓度两者都去除了将近90％的颜色和高达80％的COD，尽管这取决于废水的质量。仅改变pH值也可导致颜色去除。使用牺牲性铁或铝阳极进行电凝同样有效作为化学絮凝剂，可减少颜色和化学需氧量。来自阴极的氢气泡几乎漂浮了将凝结的物料沉淀到反应器表面，促进分离。通过激光衍射测量处理后的废水的粒径分布。基于体积的频率分布清楚地表明，化学絮凝和电凝均导致相当大的聚集。线性关系在颜色和化学需氧量去除之间进行了证明。

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