alexa Disinfection of Wastewater by Infiltration-Percolation Coupled to UV Irradiation in an Arid Tunisian Area | OMICS International
ISSN: 2157-7587

Hydrology: Current Research
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Research Article

Disinfection of Wastewater by Infiltration-Percolation Coupled to UV Irradiation in an Arid Tunisian Area

Brahmi Mounaouer*, Fourti Olfa and Hassen Abdennaceur
Water Research and Technology Centre, Borj Cédria Science and Technology Park, Tunisia, University Tunis Cartage, Tunisia
Corresponding Author : Brahmi Mounaouer
Water Research and Technology Centre
Borj Cédria Science and Technology Park
Tunisia, University Tunis Cartage, Tunisia
Tel/Fax: +21679 325 802
E-mail: [email protected]
Received July 12, 2013; Accepted August 08, 2013; Published August 14, 2013
Citation: Mounaouer B, Olfa F, Abdennaceur H (2013) Disinfection of Wastewater by Infiltration-Percolation Coupled to UV Irradiation in an Arid Tunisian Area. Hydrol Current Res 4:155. doi: 10.4172/2157-7587.1000155
Copyright: © 2013 Mounaouer B, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

This paper aimed to the study of microbiological quality of wastewater effluents issued from a sand filter system
used as a secondary treatment; this sand filter was coupled to UV irradiation system as a tertiary treatment to
assume their possible application as alternatives to chemical disinfection of municipal wastewater before agronomic
utilization. For that reason, an infiltration basin of 100 m² of area equipped with two wells of sampling, in the center
and in the periphery, has been constructed on the irrigated perimeter of Dissa in Gabes (south east of Tunisia). A
comparative study was undertaken concerning the quality of effluents obtained from the sand filter as secondary
effluent and from the UV irradiation disinfection system as a tertiary municipal wastewater treatment. Both the
combined systems gave effluent of excellent microbiological quality (almost total absence of E. coli, faecal coliforms
and P. aeruginosa). However, if the microbiological quality of effluent remained constant in the case of a sand filter
system which depends only on the quality of the influent, while with the UV-disinfection process, microbiological
quality of tertiary effluent was shown to depend on the quality of secondary effluent.
The monitoring of the UV irradiation device using a UV dose of around 96 mW.s.cm-2 and corresponding to an
exposure time of 16 sec, for the secondary effluent at the outlet of Sand Filter, showed that the average bacterial
inactivation rate was around 3 U-Log for E. coli, faecal coliforms and P. aeruginosa, respectively. Therefore, the
average concentration remaining in the effluent at the output of the UV reactor, was less than a 100 cfu/ 100 ml for
E. coli and faecal coliforms, and less than a 100 bacteria/ 100 ml for P. aeruginosa. These values coincided with the
range recommended by several standardized international guidelines.

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