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Polluting Water With A Veritable Source Of Energy:a Case Of Lagos City

Congress: 2015
Author(s): Timothy Ajayi, Godwin Chinemerem, Ayodele Olomieja

Timothy Ajayi, Godwin Chinemerem1, Ayodele Olomieja 2
Safe Water & Sanitation Embassy1, Ogun State Institute of Technology Igbesa, Nigeria2

Keyword(s): Sub-theme 6: Links with the energy, food and environmental sectors,


Lagos is the commercial nerve centre of Nigeria experiencing rapid urbanisation. It is one of the mega cities of the world with an estimated population of 17.5 million. The Lagos Lagoon which is a notable water body in Lagos state has been a sewage disposal site for the past fifty years and the quantity of sewage wastes disposed daily into the Lagoon has greatly increased due to rapid population growth. The Lagoon serves as the major source of sea foods in Lagos and also confers beauty to the city. Like some other highly populated and sewage rich cities, Lagos state is yet to utilise her abundant sewage resources in meeting her energy need instead of polluting her Lagoon. The aim of this paper is to elucidate the effects of disposing sewage waste into the Lagos Lagoon and the potential of the state generated sewage waste in meeting her formidable energy challenge.


Water samples from ten different locations of the Lagos Lagoon were analysed for the presence of pathogenic organisms using Sedimentation, Microscopy and Culture techniques. The Biochemical Oxygen Demand (BOD) and pH of the water samples were tested with the aid of BOD test apparatus and pH meter respectively. The daily average numbers of sewage tankers offloaded in all the sewage disposal sites were recorded and the average daily volume of sewage wastes disposed calculated. Analysis, Results, Conclusions and Recommendation The Analysis revealed the presence of pathogenic organisms like Ascaris lumbricoides, Giardia intestinalis, Hookworms, Escherichia coli, Salmonella species and Kleibsiella species which. Also, a BOD level of 95-225mg/l at 20oC for five days and a pH of 7.9-8.5 were recorded. This study revealed that an average of 1.1000,000 litres of sewage wastes are disposed daily by tankers in Lagos of which 70% goes into the Lagos Lagoon directly or indirectly.


This study revealed that dumping sewage wastes into the Lagos Lagoon makes the water ecologically unfit for aquatic faunas and floras and also reduce the aesthetic appearance of the environment. It also exposes those that come in contact with it to pathogenic infections. Previous Studies have shown that 1kg of dry faecal sludge has a calorific value of 17.3 MJ, this implies that the daily 1.1,000,000 litres of Faecal sludge disposed in Lagos can meet the state's energy demand.


The Productive use of Faecal Sludge is strongly recommended to sanitise the Lagos Lagoon and meet the high rate of energy demand of the state.

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