, Vol 5, No 2 (2011)

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ENVIRONMENTAL IMPLICATIONS OF SEWAGE DISPOSAL METHODS IN ENUGU METROPOLIS, SOUTHEASTERN NIGERIA

David E. Iloabachie, Ogbonnaya Igwe, Celestine O. Okogbue

Abstract


A questionnaire and observational study were randomly conducted on 204 houses to acquire information on different sewage disposal methods used in Enugu metropolis, and to investigate the impact of the sewage disposal methods on available water supplies. The results obtained show that 51% of the resident's wells are located at a distance less than 9m from the toilets. Samples from 21 different locations in the area were analyzed and studied in order to assess the quality of the groundwater. The results of the physico-chemical analysis show presence of some certain sewage sensitive parameters such as chloride (Cl-), Total Dissolved Solids (TDS), Electrical Conductivity (EC) and Nitrates (N03-), although not in significant quantity. The bacteriological analysis of the samples reveals that the aquifer/groundwater has very high concentrations of coliform bacteria varying between 130 and ≥ 2400MPN/100ml of water. Further bacteriological investigation of the groundwater quality show significant concentrations of Escherichia coli and this is an indication of faecal contamination of the groundwater. Improvement in the management of sewage such as the use of central sewer will consequently preserve the aquifer from contamination. Apparently, simple hydrogeological studies of the area such as ascertaining direction of groundwater flow and depth to water table would make sites allocation for toilets and wells easier. Relevant agencies should make continuous effort to control, regulate and educate the populace on indiscriminate disposal of sewage within the study area.  


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