Department of Biology, Faculty of Science, University of Ankara, Ankara, Turkey E-mail:
Water Sci Technol. 2017 Jun;75(12):2883-2890. doi: 10.2166/wst.2017.163.
Simultaneous phenol and Cr(VI) bioremoval by two different mixed cultures, from petroleum-contaminated soil (PS) and boron-contaminated wastewater (BW), was investigated in regard to different culture media, pH levels (6-8), initial phenol (25-100 mg/L) and Cr(VI) (15-50 mg/L) concentrations. The optimum medium was found to be mineral salt medium tested, which contained 1% (v/v) molasses (MSM). Optimum pH values were 6 for PS and 8 for BW. All of the phenol present in the samples was mineralized regardless of its concentrations tested, Cr(VI) bioremoval was enhanced by the increase in phenol concentrations, and molasses also exerted a positive effect on Cr(VI) removal, and the yields reached 100% for both pollutants, even at 13.1 mg/L Cr(VI) and 91.1 mg/L phenol concentration in PS samples. In MSM containing PS samples approximate efficiency was 100% for phenol removal; but Cr(VI) removal ratios were 64.9% and 41.7% at 25.8 mg/L and 41.3 mg/L concentrations, respectively. Finally it can be concluded that molasses stimulated Cr(VI) bioremoval at elevated phenolic conditions in the mixed microbial culture, and molasses might be of use for the bioremediation of phenol and Cr(VI) polluted wastewaters.
两种不同混合培养物（一种来自受石油污染的土壤（PS），另一种来自受硼污染的废水（BW））同时去除酚和 Cr(VI)，研究了不同培养基、pH 值（6-8）、初始酚（25-100mg/L）和 Cr(VI)（15-50mg/L）浓度对其的影响。结果发现最佳培养基为测试的无机盐培养基，其中含有 1%（v/v）糖蜜（MSM）。PS 的最佳 pH 值为 6，BW 的最佳 pH 值为 8。无论测试的浓度如何，样品中所有的酚都被矿化，Cr(VI)的生物去除率随着酚浓度的增加而提高，糖蜜对 Cr(VI)的去除也有积极影响，两种污染物的产率均达到 100%，即使 PS 样品中 Cr(VI)浓度为 13.1mg/L，酚浓度为 91.1mg/L。在含有 PS 的 MSM 中，酚的去除率接近 100%；但 Cr(VI)的去除率分别为 64.9%和 41.7%，浓度分别为 25.8mg/L 和 41.3mg/L。最后可以得出结论，糖蜜在混合微生物培养物中升高的酚条件下刺激 Cr(VI)的生物去除，糖蜜可能可用于受酚和 Cr(VI)污染的废水的生物修复。
