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首页> 外文期刊>Cogent Environmental Science >Impact of cement effluent on water quality of rivers: A case study of Onyi river at Obajana, Nigeria
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Impact of cement effluent on water quality of rivers: A case study of Onyi river at Obajana, Nigeria

机译：水泥废水对河流水质的影响-以尼日利亚奥巴贾纳的奥尼河为例

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摘要

Physico-chemical characterisation of industrial effluent is of importance in view of its inherent toxic substances. Effluent from cement plant located in Nigeria was characterised and its impact on the receiving Onyi River was investigated in this study. Effluent, water samples from upstream, discharge point along the river course and downstream location were collected monthly. The river was monitored up to about 1?km downstream from the discharge point for a period of twelve months. The impact of the effluent on the water quality downstream was shown by reduced dissolved oxygen. With respect to upstream, the levels of pH, nitrate, phosphate, total solid, total suspended solids, total dissolved solids, turbidity and biological oxygen demand at downstream were much high, arising from the influx of cement effluent. The cement effluent significantly contributed to the levels of Zn (0.045?±?0.003?mg/L) and Pb (0.016?±?0.001?mg/L) downstream such that they exceeded the criteria set by USEPA and WHO respectively. Using Prati method of classification of surface water quality, the Onyi River fell in the class of slightly polluted water. Weight arithmetic water quality index of 85.2 and metal pollution index of 3.46 corroborated the classification. Hence, adequate treatment of downstream water prior to its use for beneficial purposes is required.
机译：鉴于工业废水的固有有毒物质，其理化特性非常重要。对位于尼日利亚的水泥厂的废水进行了表征，并研究了其对接收Onyi河的影响。每月从上游，沿河道的排放点和下游位置收集废水。在距排放点下游约1公里的范围内，对河流进行了长达12个月的监测。减少的溶解氧显示出废水对下游水质的影响。就上游而言，由于水泥废水的涌入，pH，硝酸盐，磷酸盐，总固体，总悬浮固体，总溶解固体，浊度和下游生物需氧量很高。水泥废水对下游的锌（0.045±±0.003μg/ L）和铅（0.016±±0.001μg/ L）的水平有显着贡献，从而分别超过了美国环保局和世界卫生组织设定的标准。用地表水水质分类的Prati方法，Onyi河属于轻度污染水。重量算术水质指数为85.2，金属污染指数为3.46，证实了这一分类。因此，需要在将下游水用于有益目的之前对其进行充分的处理。

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