| 3 | Effectiveness of a Wastewater Treatment Plant located at EPZ in reducing Pollutants Discharged into River Athi, Kenya显示文摘Information about effectiveness of a wastewater treatment plant is vital in ensuring the quality of water discharged into water bodies and the environment in general meet set standards.In this study,the performance of a wastewater treatment plant located at the Export Processing Zone(EPZ)along River Athi in Machakos County,Kenya was assessed because the final effluent from the treatment plant is released into the river where water is used downstream.Effectiveness of the plant was assessed through the reduction percentage of pollutants between influent and effluent during the dry and wet seasons.Samples of water were collected from the following points i.e.inlet,outflow pool,outlet and along the river.The samples were analyzed for heavy metals,Total Dissolved Solids(TDS),Total Suspended Solids(TSS),Chemical Oxygen Demand(COD),Biological Oxygen Demand(BOD),organic nitrogen,phosphate,color,temperature,pH,and total coliforms.The resulting data was compared with the established standards.Standard methodologies of laboratory analysis were employed as per Kenyan regulations of 2006 on waste water treatment and discharge.From the results,the waste water treatment plant was not effective in reducing nitrates,phosphates,TDS,TSS,color,and heavy metals i.e.mercury,lead,selenium,copper and cadmium.The inefficiency was more pronounced in rain season.Nitrates(-2.04%),phosphates(-66%),mercury(-48%),lead(-48%),selenium(-2.29%)and copper(-9.75%)were high in the effluent after treatment process during the rains than in the influent.However,the treatment plant was effective in reducing Chemical Oxygen Demand(COD)and Biological Oxygen Demand(BOD).Some parameters like pH,conductivity,temperature,color and TSS were within allowable values described by Kenyan and International standards for effluent discharge into public waters.The study recommends expansion or re-designing of the treatment plant and better monitoring of the sources or types of wastewaters received at the plant for efficient and proper treatment process.Further research required on the seasonal fluctuation of pollutants along River Athi to reduce pollution of the waters.This should be coupled with studying the role of river gradient in self-cleansing of the pollutants. | Godfrey Wafula Mwakio Tole Najma Dharani Stanley Nadir | 2020 | Journal of Environmental Science and Engineering(B)2020，9，6： | 0 |
| 4 | 氯乙酰苯胺除草剂及其降解产物在肯尼亚Nzoia流域的演变显示文摘采用气相色谱法对肯尼亚沿Nzoia河9个地点的水样和沉积物样中草不绿(也称杂草锁)(α’-氯-N-(2,6-二乙基苯基)-N-(甲氧基甲基)乙酰胺)、甲氧毒草安(α-氯6’-乙基-N-(2甲氧基-1-甲基乙基)乙酰邻甲苯胺)及它们各自环境稳定的苯胺类降解物2,6-二乙基苯胺、2-乙基-6-甲基苯胺进行分析。降解物在90%以上的沉积物样和水样中检出,而母体化合物只在不到14%的水样中检出。沉积物中的杀虫剂和它们的降解物比在水中浓度高很多(1.4~10 800倍),显示出化合物在沉积物中的积累。在研究时间内沉积物中降解物的普遍存在意味着这些化合物的持续性。可以假定在热带气候为主的条件下,促使杀虫剂快速分解为环境稳定的降解物,从而在研究区域内使后者成为比其母体更重要的污染物。 | Odipo Osano Daniel Nzyuko Mwakio Tole Wim Admiraal 向连城 | 2003 | AMBIO-人类环境杂志2003，32，6： | 0 |
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