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    Impacts of sedimentation on rainwater quality: case study at Ikorodu of Lagos, Nigeria

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    Publication date
    2021
    Author
    John, Chukwuemeka K.
    Pu, Jaan H.
    Pandey, M.
    Moruzzi, R.
    Keyword
    Escherichia coli
    E. coli
    Rainwater
    Sedimentation
    Total suspended solids
    TSS
    Turbidity
    Ikorodu
    Lagos
    Nigeria
    Rights
    © (2021) This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (CC BY 4.0), which permits copying, adaptation and redistribution, provided the original work is properly cited (http://creativecommons.org/licenses/by/4.0/).
    Peer-Reviewed
    Yes
    Open Access status
    Gold
    
    Metadata
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    Abstract
    This study investigated the impact of sedimentation on rainwater storage system using a case study at the Ikorodu area of Lagos state, a rural area in Nigeria. In this investigation, the proportions of Escherichia coli (E. coli) that were settleable (due to sedimentation) and those that were at the free phase have been studied. Water samples were collected from different depths in the inspected rainwater storage tank at two different periods (i.e. rainy and dry periods) for 20 days. The samples collected from these periods have been analysed for physical and microbial measures before passing it through the serial filters with pore sizes of 500 μm, 100 μm, 10 μm and 1.5 μm to measure the retained particle mass. From the results, it was observed that: (1) the water quality at the free-phase zone was better than that at the tank’s bottom; (2) the settleable bacteria rapidly sinked to bottom; (3) the correlation of turbidity, E. coli and total suspended solids (TSS) for all the rain events showed a relatively high Pearson’s coefficient of 0.9 to one another; and (4) over 70% of settling TSS occurred within first 36 hours. Finally, it has been found that the physical sedimentation process can significantly reduce the microbial measures.
    URI
    http://hdl.handle.net/10454/18450
    Version
    Published version
    Citation
    John CK, Pu JH, Pandey M et al (2021) Impacts of sedimentation on rainwater quality: case study at Ikorodu of Lagos, Nigeria. Water Supply. 21(7): 3356-3369.
    Link to publisher’s version
    https://doi.org/10.2166/ws.2021.093
    Type
    Article
    Collections
    Engineering and Digital Technology Publications

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