Aksaray University, Engineering Faculty, Department of Environmental Engineering, 68100 Aksaray, Turkey.
Colloids Surf B Biointerfaces. 2011 Sep 1;86(2):404-8. doi: 10.1016/j.colsurfb.2011.04.031. Epub 2011 May 5.
Ca-rich water and wastewater have caused problems in water use, wastewater reuse and the operations of reactors treating Ca-rich wastewater. Nowadays, reuse of wastewaters is fast gaining importance as water sources have been polluted. Therefore, the concept of biocatalytic calcification reactors (BCR) based on urea hydrolysis, pH increase and calcite production has been studied to remove Ca from wastewaters. This biological process produces significant amounts of waste sludge. In the present study, Cr(VI) adsorption on the ureolytic mixed culture (UMC) waste by-product from BCR was investigated to evaluate its potential for metal removal. The biosorption process was investigated using equilibrium batch tests and the data were fit to the Langmuir, Freundlich and Temkin isotherm models. The Cr(VI) ion concentration dependence of sorption (1-100 mg/L) could be fit to the Langmuir isotherm model. Monolayer adsorption capacity, qm (mg/g), of the adsorbent was 8.67 and the Langmuir constant b (L/mg) was 0.881. Based on the obtained results, the waste UMC appears to be a potential biosorbent for the removal of Cr(VI) from wastewater, although its adsorptive capacity is lower than those of other biosorbents.
富钙水和废水在用水、废水再利用以及处理富钙废水的反应器运行方面造成了问题。如今，随着水源受到污染，废水再利用正迅速变得重要起来。因此，基于尿素水解、pH 值升高和方解石生产的生物催化钙化反应器 (BCR) 的概念已被研究用于从废水中去除钙。该生物过程会产生大量废污泥。在本研究中，研究了 Cr(VI)在 BCR 产生的脲酶混合培养物 (UMC) 废副产物上的吸附，以评估其去除金属的潜力。使用平衡批处理试验研究了生物吸附过程，数据拟合了 Langmuir、Freundlich 和 Temkin 等温线模型。吸附（1-100mg/L）的 Cr(VI)离子浓度依赖性可以拟合 Langmuir 等温线模型。吸附剂的单层吸附容量 qm（mg/g）为 8.67，Langmuir 常数 b（L/mg）为 0.881。根据获得的结果，尽管 UMC 废副产物的吸附容量低于其他生物吸附剂，但它似乎是一种从废水中去除 Cr(VI)的潜在生物吸附剂。
