Effect of Salinity on Cr(VI) Bioremediation by Algal-Bacterial Aerobic Granular Sludge Treating Synthetic Wastewater
Effect of Salinity on Cr(VI) Bioremediation by Algal-Bacterial Aerobic Granular Sludge Treating Synthetic Wastewater
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DOI：
10.3390/pr9081400
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发表时间：
2021-08
期刊：
影响因子：
3.5
通讯作者：
B. Nguyen;Xiaojing Yang;Shota Hirayama;Jixiang Wang;Ziwen Zhao;Z. Lei;K. Shimizu;Zhenya Zhang;S. X. Le
中科院分区：
文献类型：
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作者：
B. Nguyen;Xiaojing Yang;Shota Hirayama;Jixiang Wang;Ziwen Zhao;Z. Lei;K. Shimizu;Zhenya Zhang;S. X. Le
高盐重金属废水对传统活性污泥法的污水处理厂提出了挑战。生物修复技术是一种有效、经济、环保的去除重金属污染的技术。藻类-细菌好氧颗粒污泥（AGS）是一种新型的生物吸附剂，可用于处理重金属废水，尤其是Cr（VI）废水。在这项研究中，两个相同的圆柱形序批式反应器（SBR），即，采用R1（对照）和R2（添加1%的盐度）培养藻-菌AGS，然后评价盐度对两种SBR性能的影响。结果表明，在1%的盐度下，藻-菌AGS的吸附能力减弱，表面粗糙，对有机物的去除影响不大。盐度为1%时，无机氮（TIN）和总磷（TP）的去除率受到显著影响，当Cr（VI）浓度为2 mg/L时，TN和TP的去除率进一步降低。Cr（VI）的去除效率，另一方面，由R1和R2分别为31-51%和28-48%，表明盐度暴露可能会轻微影响Cr（VI）的生物修复。此外，盐度暴露刺激更多的多糖从藻-细菌AGS分泌，而Cr（VI）暴露促进蛋白质的分泌。
Heavy metal-containing wastewater with high salinity challenges wastewater treatment plants (WWTPs) where the conventional activated sludge process is widely applied. Bioremediation has been proven to be an effective, economical, and eco-friendly technique to remove heavy metals from various wastewaters. The newly developed algal-bacterial aerobic granular sludge (AGS) has emerged as a promising biosorbent for treating wastewater containing heavy metals, especially Cr(VI). In this study, two identical cylindrical sequencing batch reactors (SBRs), i.e., R1 (Control) and R2 (with 1% additional salinity), were used to cultivate algal-bacterial AGS and then to evaluate the effect of salinity on the performance of the two SBRs. The results reflected that less filamentation and a rougher surface could be observed on algal-bacterial AGS when exposed to 1% salinity, which showed little influence on organics removal. However, the removals of total inorganic nitrogen (TIN) and total phosphorus (TP) were noticeably impacted at the 1% salinity condition, and were further decreased with the co-existence of 2 mg/L Cr(VI). The Cr(VI) removal efficiency, on the other hand, was 31–51% by R1 and 28–48% by R2, respectively, indicating that salinity exposure may slightly influence Cr(VI) bioremediation. In addition, salinity exposure stimulated more polysaccharides excretion from algal-bacterial AGS while Cr(VI) exposure promoted proteins excretion.