POLLUTION PROBLEMS AND AN ENGINEERING APPROACH TO THE MANAGEMENT AND CONTROL OF INDUSTRIAL EFFLUENTS IN OTTA, NIGERIA
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- NGN 3000
ABSTRACT
This study examined the effects of effluent discharges from various point-loads on a purposively selected receiving river, the self-recovery ability of the river and the treatability of both the discharges and the receiving stream in a heavily industrialized community.
The work involved field survey of industries producing and discharging effluents in the study area (Ado Odo/ Otta industrial zone of Ogun State, Nigeria); determination of the effluents‘ physico – chemical, biological and microbial characteristics, and the impact of the discharged effluents on the receiving surface water using standard methods. Primary data were also collected for analysis using structured questionnaires and oral interviews to elicit the contribution of the industries to water pollution.
To advance analytical process various scenarios of improving water quality along the river under study were examined. An array of computer based hydrogeometric and water quality models were investigated. QUAL2K was operated as a one-dimensional steady state and completely mixed system for hydrogeometric and water quality analysis on the Atuwara River. The 10.81 km long stretch from upstream at Owode – Ijako to Iju Water Works was mapped with geographical positioning systems (GPS) and divided into 7 reaches with further segmentation of 0.3 km each from where grab samples were collected routinely throughout the study period.
The research analyzed the effluent discharges from all industries along the river for priority pollutants such as BOD, COD, TDS, TSS, and Heavy metals using standard methods. The effluent samples were obtained and compared with river water samples before and after receiving waste loads in the dry and wet seasons. Model result was interfaced with geographical information systems (GIS) for clear display of model outcome to demarcate polluted zones, limnographic points and wetlands of the Atuwara watershed. The worst scenario of the effluent samples were obtained for laboratory-scale treatability studies by applying electro – Fenton alone or with further treatment by Granulated Activated Carbon (GAC) type BBC 945 to properly remove traces of heavy metals.
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