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首页> 外文期刊>Separation and Purification Technology >Pilot scale hexavalent chromium removal with reduction, coagulation, filtration and biological iron oxidation
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Pilot scale hexavalent chromium removal with reduction, coagulation, filtration and biological iron oxidation

机译：试验规模六价铬除去，减少，凝血，过滤和生物铁氧化

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Cr(VI) is identified as highly toxic, therefore a far-reaching limitation of total chromium or Cr(VI) in drinking water was proposed by the Germany Environment Agency. There is a lack in efficient treatment processes to reach Cr(VI) concentrations below 1 mu g L-1. In this study, the combination of chemical reduction, coagulation and filtration (RCF) was further developed by adding biological iron removal as filtration step (RCbF). The aim of this enhancement was to reach lower effluent concentrations and a higher robustness regarding process parameters. The effectiveness of Cr(VI) removal was investigated using two-stage pilot-scale waterworks. RCbF reaches Cr(VI) effluent concentrations below 0.5 mu g L-1 despite variations of pH, filtration velocity, or Cr(VI) influent concentrations. Fe(II) dosage and hence molar excess of Fe(II) over Cr(VI) was identified as the key parameter for Cr(VI) removal. Low oxygen dosage for biological iron removal improved the efficiency of RCbF compared to RCF. The co-precipitation of Cr(III) and Fe(III) as solid solution in the supernatant of the filter bed was promoted by low oxygen concentrations making Cr(VI) the preferred oxidant. RCbF was shown to be a suitable treatment process for reaching a low limit value for total chromium or Cr(VI) concerning technical feasibility.
机译：德国环境署提出了Cr（VI）鉴定为毒性，因此饮用水中总铬或Cr（vi）的深远限制。缺乏有效的处理过程，以达到低于1μgL-1的Cr（VI）浓度。在该研究中，通过添加生物铁除去作为过滤步骤（RCBF）来进一步开发化学还原，凝血和过滤（RCF）的组合。这种增强的目的是达到较低的流出物浓度和关于工艺参数的更高的鲁棒性。使用两阶段先导水果研究了Cr（vi）去除的有效性。尽管pH，过滤速度或Cr（VI）流入浓度变化，RCBF达到0.5μg-1以下0.5μg-1的污水浓度。 Fe（ii）剂量和因此在Cr（VI）上的Fe（II）的摩尔过量的Fe（II）被鉴定为Cr（VI）去除的关键参数。与RCF相比，生物氧化铁的低氧剂量改善了RCBF的效率。通过低氧浓度使得Cr（VI）优选的氧化剂，促进Cr（III）和Fe（III）作为固体溶液的固溶溶液。 RCBF被证明是达到技术可行性的总铬或Cr（VI）的低限值的合适的处理过程。

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