In the last few years, the northwestern coastal zone of Egypt has been affected by many stresses that impact its water resources, leading to undesirable consequences related to water quantity and quality. This paper aims to evaluate the possible contamination sources of shallow aquifers in the El‐Omayed area, Egypt, that are causing its deterioration; this was achieved through an integration of hydrochemical and isotopic techniques, an assessment of the undesirable consequences of potential toxic metals (PTMs) on human health risk as a result of direct water consumption, and finally, the application of biological treatment in the remediation of some metal contamination. The chemical composition, environmental isotopes (δ¹⁸O and δ²H), and microbial analyses were analyzed from 13 collected water samples. Approximately 20% of the groundwater samples were classified as fresh water, and the rest were classified as slightly saline to moderately saline. Stable isotopes proved the contribution of the El Sheikh Zoied canal (which is mainly recharged from the Nile system) as a recharge source. The toxicity of PTMs (Cd, Cu, Co, Cr, Pb, Zn, B, and Fe) was evaluated on the basis of their exceedance values. It was proven that the majority of the groundwater samples were contaminated, which might be attributed to natural and anthropogenic actions in the study area; however, according to human health risk exposure assessment calculations, there is no human cancer risk posed via ingestion of drinking groundwater. The total bacterial count was determined for all water samples; autochthonous microorganisms were capable of removing heavy metals in the polluted water sample. The bacterial strain M52, which was identified by 16S rRNA sequencing as Stenotrophomonas rhizophila, showed the best results, by removing 75% and 65% of the initial concentrations of Fe and B, respectively. The results indicate that this bacterial strain may be useful and represents an environmentally friendly method to remove pollutants and heavy metals from contaminated water. Integr Environ Assess Manag 2020;16:461–471. © 2020 SETAC

中文翻译：

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埃及El Omayed地区浅层地下水的环境污染和微生物处理评估。

在过去的几年中，埃及西北沿海地区受到许多影响其水资源的压力的影响，从而导致与水量和水质有关的不良后果。本文旨在评估埃及El-Omayed地区浅层含水层可能引起其恶化的污染源。这是通过将水化学和同位素技术相结合，对直接饮水导致的潜在有毒金属（PTM）对人类健康风险的不良后果进行评估以及最后将生物处理应用于某些水体修复方面的评估而实现的。金属污染。的化学成分，环境同位素（δ ¹⁸ O和δ ²H），并从13个收集的水样中分析了微生物。大约20％的地下水样品被分类为淡水，其余被分类为轻度至中度盐水。稳定的同位素证明了El Sheikh Zoied运河（主要从尼罗河系统补给的）作为补给源的贡献。根据PTM的超标值评估其毒性（Cd，Cu，Co，Cr，Pb，Zn，B和Fe）。事实证明，大多数地下水样本都被污染了，这可能是由于研究区域的自然和人为行为造成的。但是，根据人类健康风险暴露评估计算，没有因摄入地下水而造成的人类癌症风险。确定所有水样的细菌总数；土生微生物能够去除污水样品中的重金属。细菌菌株M52，通过16S rRNA测序鉴定为嗜麦芽单胞菌显示出最好的效果，分别去除了初始浓度的Fe和B的75％和65％。结果表明该细菌菌株可能有用，并且代表了一种从污染水中去除污染物和重金属的环保方法。Integr环境评估管理2020； 16：461–471。©2020 SETAC