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Assessment of drinking water quality characteristics and quality index of Rajshahi city, Bangladesh

机译:孟加拉国拉力山地区饮用水质量特征及饮用水质量特征及素质指数评估

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The present study on chemistry, environmetrics and quality index of 116 groundwater samples collected in pre- and post-monsoon periods in the years of 2014 and 2015 from the drought-prone Rajshahi City Corporation area, Bangladesh, is carried out for its drinking suitability from management perspective. According to the Bangladesh Drinking Water Standards (2005), parameters like pH, Ca~(2+), Mg~(2+), Cl~-, Fe~(total) and Mn~(2+) exceed the desirable limit, but within permissible limit without adverse effect except Mg~(2+) concentration, which accounts for 45% in pre-monsoon period and makes groundwater unsafe for drinking purposes. The groundwater belongs to alkaline earth elements (Ca~(2+)+Mg~(2+)) and exceed alkali elements (Na~++K~+), and weak acids (HCO_3~-) exceed the strong acids (SO_4~(2-)) where Ca~(2+) and HCO_3~- are dominant ions, and attribute to temporary hardness of groundwater. The groundwater of the aquifer is of Ca~(2+)-Mg~(2+)-HCO_3~- type. The source of different ions is associated with partial ion exchanges, weathering of calcareous nodules and clay minerals, flow of groundwater system through aquifer lithology, municipal sewerage, anthropogenic influence, etc. The drinking water quality index also reveals that groundwater mostly falls in 'good' category having suitability for drinking purposes round the year. But increasing population and water demand in the area may create threat of quality hazard in near future, and regular groundwater quality monitoring should be carried out periodically for supplying safe drinking water to city dwellers.
机译:2014年和2015年孟加拉国干旱拉正义城市公司区(Bangladesh)的季后赛期间和季风期间收集的116个地下水样本的化学,环境和质量指数研究,以其饮用适用性管理视角。根据孟加拉国饮用水标准(2005),pH值,Ca〜(2+),Mg〜(2+),Cl〜,Fe〜(总计)和Mn〜(2+)等参数超出了所需的极限,但在允许的极限范围内没有不良反应,除Mg〜(2+)浓度外,在季风期间占45%,并使地下水不安全饮用目的。地下水属于碱土元素(Ca〜(2 +)+ Mg〜(2+)),超过碱性元素(Na〜++ K〜+),弱酸(HCO_3〜 - )超过强酸(SO_4 〜(2-))其中Ca〜(2+)和HCO_3〜 - 是主要的离子,属于地下水的临时硬度。含水层的地下水是Ca〜(2 +) - mg〜(2 +) - HCO_3〜型。不同离子的来源与部分离子交换,钙质结节和粘土矿物的风化,通过含水层岩性,城市污水处理,人为影响等地下水系统的流动。饮用水质量指数也揭示了地下水主要落入“良好” '类别适用于今年追捕目的。但由于该地区的人口和水需求增加可能在不久的将来产生质量危害的威胁,并且应定期进行定期的地下水质量监测,以便向城市居民提供安全的饮用水。

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