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Urban river pollution in Bangladesh during last 40 years: potential public health and ecological risk present policy and future prospects toward smart water management

机译：孟加拉国的城市河流污染在过去40年期间：潜在的公共卫生和生态风险目前的政策未来的智能水管理前景

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River water is very much important for domestic, agriculture and industrial use in Bangladesh which is in critical condition from long time based on research data. During last 40 years, extreme pollution events occurred in peripheral rivers surrounding Dhaka city and Karnaphuli River in Chittagong city. Present data showed that other urban rivers are also in critical condition especially Korotoa, Teesta, Rupsha, Pashur and Padma. The pollutants flowing with water made a severe pollution in downstream areas of rivers. Metals concentrations in river water was found to be higher in dry season. Dissolve oxygen (DO) was nearly zero in Buriganga River and several points in Turag, Balu, Sitalakhya and Karnaphuli River. NO3-, NO2- and PO43- pollution occurred in different rivers. Zn, Cu, Fe, Pb, Cd, Ni, Mn, As and Cr concentration was above drinking water standard in most of the river and some metals was even above irrigation standard in water from several rivers. Sediment data showed very much higher metal concentrations in most of the rivers especially peripheral rivers in Dhaka and Karnaphuli, Korotoa, Teesta, Rupsha and Meghna River. Metal concentrations in sediment was above US EPA threshold value in most of the rivers. Metal concentrations in fish and agricultural crops showed that bioaccumulations of metals had occurred. The concentration of metals showed the trend like: water
机译：河流对孟加拉国的国内，农业和工业用途非常重要，这在基于研究数据的长期来看，这是在危急条件下。在过去的40年里，达卡市达卡市和吉大港市卡纳洛河周围的周边河流发生了极端污染事件。目前的数据表明，其他城市河流也在批判性条件下，特别是克洛托卡，Teesta，Rupsha，Pashur和Padma。流动水流的污染物在河流下游造成严重污染。在河水中发现金属浓度在干燥的季节较高。溶解氧气（DO）在Buriganga河中几乎为零，在自然，巴鲁，锡塔拉尼亚和卡纳洛里河的几个点。在不同的河流中，No3-，No2-和Po43污染。在大多数河流中，Zn，Cu，Fe，Pb，Cd，Ni，Mn，As和Cr浓度高于饮用水标准，一些金属甚至在来自几个河流的水中的灌溉标准。沉积物数据在大多数河流中表现出非常高的金属浓度，特别是达卡和卡纳洛丽，克洛托亚，雷斯塔，鲁莎和梅尔伽河的外围河流。大多数河流中，沉积物中的金属浓度高于美国EPA阈值。鱼类和农业作物中的金属浓度表明，已发生金属生物累积。金属浓度显示出趋势，如：水<鱼<沉积物。发现农作物通过污染水灌溉含有有毒金属。用于非致癌和致癌性的每日摄入量的计算数据表明，污染的食品的消耗会导致严重的健康伤害。

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