ANALYSIS OF WATER QUALITY DETERIORATION IN NWORIE RIVER, OWERRI- IMO STATE, SOUTHEAST, NIGERIA

Nwosu T. V, Nwaiwu C.J, Egboka N.T
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Abstract

Due to indiscriminate activities of man through sand excavation, sand mining and illegal waste disposal within the watershed the study evaluated the effect of these activities on selected water quality parameters of Nworie River in Owerri -Imo State, Southeast Nigeria. The study area was divided into Upstream, Midstream and downstream. The river was sampled and the raw data from water sampling were subjected to laboratory analysis; results obtained were matched with standards. The results showed that the average pH of the river was 7.4; upstream and midstream had higher pH values than the downstream with low pH and these were within the permissible limit. Biological oxygen Demand (BOD) of the river were 75mg/l, 60mg/l and 56mg/l at the Upstream, Midstream and downstream with an average value of 64 mg/l . The river had a mean turbidity value of 76NTU and mean Total Dissolved solids (TDS) value of 272mg/l which were above the permissible limit. Calcium (Ca2+) did not exceed the standard limit while magnesium exceeded the standard limit by 68% at the Upstream. Nworie river had mean water conductivity value of 93S/cm; water conductivity at the Midstream and downstream were within the permissible limits while the Upstream had 6% increase above the acceptable limit. It was observed from this study that Nworie river exhibited three different colours of light-green, dark-green and brownish-muddy colour respectively at the Upstream, Midstream and Downstream which could be attributed to the level of erosional deposits and sediment loads from the degraded watershed. Further degradation of the watershed should be avoided by practising good soil conservation measures, ensuring that indiscriminate activities of inhabitants of the area are stopped and since environmental balance, land degradation, water management and food security are strongly linked, each must be addressed in the context of the other to have a measurable impact to the society.
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尼日利亚东南部奥韦里-莫莫州nworie河水质恶化分析
由于人类在流域内不分青红皂白地进行采砂、采砂和非法废物处置,本研究评估了这些活动对尼日利亚东南部奥韦里-伊莫州Nworie河选定水质参数的影响。研究区划分为上游、中游和下游。对河流进行了采样,并对水样的原始数据进行了实验室分析;所得结果与标准相符。结果表明:河流平均pH值为7.4;上游和中游pH值高于下游,pH值较低,但均在允许范围内。上游、中游和下游生物需氧量(BOD)分别为75mg/l、60mg/l和56mg/l,平均值为64mg /l。平均浊度值为76NTU,平均总溶解固溶体(TDS)值为272mg/l,均超过允许限值。在上游,钙(Ca2+)未超过标准限值,而镁超过标准限值68%。Nworie河平均水电导率为93S/cm;中下游水电导率均在允许范围内,上游水电导率超出允许范围6%。研究发现,Nworie河在上游、中游和下游分别呈现出浅绿色、深绿色和棕泥色三种不同的颜色,这可能是由于侵蚀沉积物的水平和退化流域的泥沙负荷所致。应通过采取良好的土壤保持措施来避免分水岭的进一步退化,确保停止该地区居民不分皂白的活动,由于环境平衡、土地退化、水管理和粮食安全密切相关,必须在彼此的背景下加以处理,以便对社会产生可衡量的影响。
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