Abstract
Fourteen (14) water parameters were considered for the Ogbese river quality assessment and water quality index (WQI) tool to classify it and to see if it required treatment before usage. Samples from 20 points at 50 ms interval were collected in February and June 2013 representing dry and wet seasons, respectively, and in accordance with American Public Health Association, APHA (Publications on standard methods for the examination of water and wastewater, pp 123–189, 2005) standard procedures. Most of the parameters were within maximum permissible limits of the World Health Organization (WHO), Food and Agriculture Organization (FAO) and Nigeria Standards for Drinking Water Quality (NSDWQ) with the exception of total dissolved solid, turbidity, electrical conductivity and total coliform in both seasons. Lead, zinc and iron were not detected in dry season, while their traces were recorded in wet season. WQI indicated considerable degrees of pollution with classification numbers of 46.61 and 44.91 for dry and wet seasons, respectively, and falls within Class IV of the general rating scale.
Highlights
Ogbese river is one of the most important rivers in both the central and northern zones of Ondo state, Nigeria (Oyelami et al 2013)
The dry season has the mean value of 28.50 ± 1.51 °C, while the wet season has the mean value of 26.15 ± 1.67 °C (Table 1) and it could be due to weather variations occasioned by the distinctiveness of the two main seasons in Nigeria
Similar observations were recorded for biochemical oxygen demand (BOD) which ranged from 2.0 to 28 mg/L and 1.25 to 9.20 mg/L and average values of 13.29 ± 5.74 and 2.82 ± 2.30 for dry and wet seasons, respectively
Summary
Ogbese river is one of the most important rivers in both the central and northern zones of Ondo state, Nigeria (Oyelami et al 2013). Orjiekwe et al (2013) reported the pollution of Ogbese river in Ovia North-East Local Government Area of Edo State, south-east Nigeria and the results showed that most of the pollution indices of the water samples analyzed indicated. Rapid deterioration in water quality is due to increasing population pressure, rapid urbanization and industrialization, and inadequate sanitation facilities, with water resources being contaminated by a variety of hazardous chemicals and virulent pathogens (Ogedengbe and Akinbile 2004). These pollutants have been caused mainly by untreated human and animal wastes, garbage, and industrial wastes. One vital solution to this pollution problem is monitoring and management to maintain the quality of water as well as the development
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
