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首页> 外文期刊>Separation and Purification Technology >Variables affecting melanoidins removal from molasses wastewater by coagulation/flocculation
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Variables affecting melanoidins removal from molasses wastewater by coagulation/flocculation

机译：通过混凝/絮凝影响从糖蜜废水中去除黑素的变量

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Coagulation/flocculation process was applied in the polishing treatment of molasses wastewater on a bench-scale. Important operating variables, including coagulant type and dosage, solution pH, rapid mixing conditions as well as the type and dosage of polyeletrolytes were investigated based on the maximum removal efficiencies of chemical oxygen demand (COD) and color, residual turbidity and settling characteristics of floes. HPSEC was utilized to evaluate the removal of molecular weight fractions of melanoidins-dominated organic compounds. Experimental results indicate that ferric chloride was the most effective among the conventional coagulants, achieving 89% COD and 98% color eliminations; while aluminum sulfate was the least effective, giving COD and color reductions of 66% and 86%, respectively. In addition to metal cations, counter-ions exert significant influence on the coagulation performance since Cl~-based metal salts attained better removal efficiency than SO4~(2-) -based ones at the optimal coagulant dosages. Coagulation of molasses effluent is a highly pH-dependent process, with better removal efficiency achieved at lower pH levels. Rapid mixing intensity, rather than rapid mixing time, has relatively strong influence on the settling characteristics of floes formed. Lowering mixing intensity resulted in increasing settling rate but the accumulation of floating floes. When used as coagulant aids, synthetic polyelectrolytes showed little effects on the improvement in organic removal. On the other hand, cationic polyacrylamide was observed to substantially enhance the settleability of floes as compared to anionic polyacrylamide. The effects of rapid mixing conditions and polymer flocculants on the coagulation performance were discussed.
机译：将凝结/絮凝工艺应用于实验室规模的糖蜜废水的抛光处理。根据化学需氧量（COD）的最大去除效率和絮凝物的颜色，残留浊度和沉降特性，研究了重要的操作变量，包括凝结剂类型和剂量，溶液pH，快速混合条件以及聚电解质的类型和剂量。 。 HPSEC被用于评估去除以类黑素为主的有机化合物的分子量级分。实验结果表明，氯化铁是常规混凝剂中最有效的，可实现89％的COD和98％的消色效果。而硫酸铝效果最差，分别使COD和颜色减少66％和86％。除金属阳离子外，抗衡离子还对混凝性能产生重要影响，因为在最佳混凝剂剂量下，基于Cl〜的金属盐比基于SO4〜（2-）的金属盐具有更好的去除效率。糖蜜流出物的凝结是高度依赖pH值的过程，在较低pH值下可获得更好的去除效率。快速的混合强度而不是快速的混合时间对形成的絮凝物的沉降特性具有相对较大的影响。降低混合强度会导致沉降速度增加，但会产生漂浮的絮凝物。当用作凝结助剂时，合成的聚电解质对有机去除的改善影响很小。另一方面，观察到与阴离子聚丙烯酰胺相比，阳离子聚丙烯酰胺显着提高了絮凝物的沉降性。讨论了快速混合条件和聚合物絮凝剂对混凝性能的影响。

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