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Environmental risk assessment of the intake of contaminants in aquifers in the vicinity of a reclaimed waste dumpsite in Owerri municipal, Southeastern Nigeria
Applied Water Science ( IF 5.5 ) Pub Date : 2021-01-18 , DOI: 10.1007/s13201-020-01355-4
Francis Chizoruo Ibe , Alexander Iheanyichukwu Opara , Collins Emeka Amaobi , Bridget Onyekachi Ibe

The study investigated groundwater sources within reclaimed municipal waste dumpsites around Akachi road in Owerri, Southeastern Nigeria. The research evaluated the pollution and risk inherent in the consumption of groundwater in the vicinity of the reclaimed waste dumpsite using standard procedures. Results showed acidic pH values for some groundwater samples within the reclaimed waste dumpsite. Elevated nitrate (NO3), aluminium (Al) and chromium (Cr) concentrations above the World Health Organization (WHO) limits for drinking water samples were recorded in some of the groundwater samples from the study area. The observed strong positive correlations between the metallic contaminants indicated that the distribution of the pollutants has a strong relationship with organic contaminants in the reclaimed waste dumpsite. Low contamination factor was exhibited by all metals for the individual samples except for Cr in sample A and Al in sample A and D. The pollution load index for all the samples was low, except for sample C with a pollution load index of unity. Elevated hazard quotient > 1 and hazard index > 1 were observed for both adults and children due to high Cr levels. The chronic daily intake risk assessment revealed values < 1, while carcinogenic risk values greater than 10−6 and 10−4 were observed for the samples suggesting potential health risk for children and adults. The water quality index of samples from the reclaimed waste dumpsite calls for concern due to elevated levels of Al and Cr. These findings, therefore, suggest the need to treat the groundwater from the reclaimed dumpsite before consumption to avert serious health risks. Finally, waste dumpsites should be remediated or allow to undergo natural remediation before reclamation, erecting residential structures, and sinking of boreholes for water supply within such areas.



中文翻译:

尼日利亚东南部Owerri市内一个再生废料场附近含水层中污染物摄入的环境风险评估

该研究调查了尼日利亚东南部Owerri的Akachi路周围的再生市政垃圾场中的地下水源。该研究使用标准程序评估了再生废料场附近地下水的消耗所固有的污染和风险。结果显示,在回收的垃圾场中一些地下水样品的酸性pH值。升高硝酸盐(NO 3 -),在研究区域的一些地下水样本中记录了高于世界卫生组织(WHO)饮用水样本限量的铝(Al)和铬(Cr)浓度。观察到的金属污染物之间的强正相关性表明,污染物的分布与再生垃圾场中的有机污染物有很强的关系。除样品A中的Cr和样品A和D中的Al外,所有样品的所有金属均显示出较低的污染因子。所有样品的污染负荷指数均较低,但样品C的污染负荷指数为1。由于高的Cr水平,成人和儿童的危险商均> 1,危险指数> 1。慢性每日摄入风险评估显示值<1样本中观察到-6和10 -4,表明儿童和成人有潜在的健康风险。由于Al和Cr含量的增加,来自回收废料场的样品的水质指数值得关注。因此,这些发现表明,有必要在消费之前对再生填埋场的地下水进行处理,以避免严重的健康风险。最后,应该对废物堆放场进行补救或对其进行自然补救,然后再进行填海,竖立住宅结构以及在这些区域内沉水钻孔。

更新日期:2021-01-18
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