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2012 (Vol. 4, Issue: 02)
Article Information:

The Growth of Escherichia coli in Soil Layers Separating the Soil Surface from the Underground Water Table, in Central Africa: The Hierarchical Influence of the Soil Chemical Characteristics

Moïse Nola, Olive V. Noah Ewoti, Mireille E. Nougang, Luciane M. Moungang, Nour-Eddine Chihib, François Krier, Jean-Pierre Hornez and Thomas Njiné
Corresponding Author:  Moïse Nola 

Key words:  BOC, chemical, dominant factor, E. coli, growth rate, retention, soil layer
Vol. 4 , (02): 196-206
Submitted Accepted Published
2011 November, 15 2011 November, 29 2012 February, 01
Abstract:

The study was carried aimed at assessing the future of E. coli during its transfer through soil layers containing Biodegradable Organic Carbon (BOC) and to classify in order of hierarchy some soil chemical factors that may influence this process from soil surface to the underground water table. A circular hole was dug from the soil surface to the underground water table. This hole crossed 8 different soil layers which were named H1, H2, …, H8 from the soil surface to the underground water table. Experiments were carried out with soil particles with or without BOC. In the absence of BOC, cell retention occurred in all soil layers used. In the presence of BOC, cell retention also, initially occurred and cell growth occurred with a delay which varied from one soil layer to another. Bacterial cell growth from soil layers closer to the surface to those in contact with the underground water table was 1.34, 1.23, 1.22, 1.01, 1.02, 0.86, 0.80 and 0.75/h, respectively. Using the sum of power law function, it was noted that the most 3 factors controlling the cell growth rate in most soil layers are Fe, K, Si, Al and N. The factor K influences in all soil layers. Si also influence in all soil layers with H1 excepted. Fe mostly influences in the soil layers H1, H2, H4 and H6. The factor Al and the factor N mostly influence in the soil layers H1 and H3 and in the soil layers H5, H7 and H8, respectively. During wastewater infiltration through soil layers, bacterial pollutants would be retained on the particles of soil. This retention may be offset by cell growth if the water contains BOC. The process is controlled by various chemicals of the soil, in different magnitude with respect to the soil layer.
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  Cite this Reference:
Moïse Nola, Olive V. Noah Ewoti, Mireille E. Nougang, Luciane M. Moungang, Nour-Eddine Chihib, François Krier, Jean-Pierre Hornez and Thomas Njiné, 2012. The Growth of Escherichia coli in Soil Layers Separating the Soil Surface from the Underground Water Table, in Central Africa: The Hierarchical Influence of the Soil Chemical Characteristics.  Research Journal of Environmental and Earth Sciences, 4(02): 196-206.
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