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NotificationsNotify me of updates to EFFECTS OF SOLAR DISINFECTION AND HEATING ON THE SENSITIVITY OF VIRULENT MULTIPLEANTIBIOTIC RESISTANT AND NON VIRULENT SENSIBLE STRAINS OF NON-01 VIBRIO CHOLERAE AND FECAL COLIFORMS ISOLATED FROM MARRAKESH GROUNDWATER
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EFFECTS OF SOLAR DISINFECTION AND HEATING ON THE SENSITIVITY OF VIRULENT MULTIPLEANTIBIOTIC RESISTANT AND NON VIRULENT SENSIBLE STRAINS OF NON-01 VIBRIO CHOLERAE AND FECAL COLIFORMS ISOLATED FROM MARRAKESH GROUNDWATER $100.00
Authors:  Hafsa Lamrani Alaoui, Noureddine Mezrioui and Khalid Oufdou
Abstract:
In Marrakesh region (3136 North, 0802 West, 471 m of altitude, Morocco),
groundwater constitutes the main sources of drinking water supply for a large part of
suburban populations. This region is under arid Mediterranean climate with a rainfall
average of 200 mm per year. Suburban communities depend only on untreated well water
as a source of human and animal drinking and other domestic activities. They dont have
the necessary equipment to deal with the evacuation of wastewater and domestic waste
collection is irregular or absent. Bacterial abundances of fecal coliforms (FC) and non-O1
Vibrio cholerae showed that the well waters are unsuitable for drinking water and other
domestic uses by local populations.
Therefore, easily used individually methods for disinfecting the well water in these
areas are required. In this research, we tested the effects of solar radiation on virulent-multiple antibiotic resistant strains and non-virulent sensible strains of non-O1 Vibrio
cholerae and FC isolated from contaminated well water. Over the experiment, non-O1 V.
cholerae strains survived better to sunlight than FC strains which declined completely no
more than 3 h of exposure with die-off coefficient of 3.3 h-1. Whereas, non-O1 V.
cholerae strains declined after 5 h with die-off coefficient of 2.5 h-1. Virulent-multiple
antibiotic resistant strains of non-O1 V. cholerae appeared to be less sensitive (die-off
coefficient k = 2.071 h-1) to sunlight than non-virulent sensible strains of non-O1 V.
cholerae whose survival was markedly reduced (k = 3.042 h-1). To determine the
contribution of temperature in the solar disinfection process, the effect of heating was
separately tested. The bacterial contamination reduction required much time and was
lesser with heating experiment than with solar radiation. Inactivation of these bacteria
was due to the synergistic effects of solar irradiation (bactericidal effects) and thermal
water treatment. Virulent-multiple antibiotic resistant strains of non-O1 Vibrio cholerae
and FC were markedly reduced by low cost solar radiation under the arid climate of
Marrakesh. The technique of solar disinfection is an adequate solution to inactivate these
bacteria responsible for potential health effects of suburban and rural populations using
this groundwater without any treatment. Our results can provide simple and practical
method for improving the quality of well water, with regards to the local climate and the
socio-economic context of the region. 


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EFFECTS OF SOLAR DISINFECTION AND HEATING ON THE SENSITIVITY OF VIRULENT MULTIPLEANTIBIOTIC RESISTANT AND NON VIRULENT SENSIBLE STRAINS OF NON-01 VIBRIO CHOLERAE AND FECAL COLIFORMS ISOLATED FROM MARRAKESH GROUNDWATER