Water is a rare resource common to all humanity  . Access to safe drinking water is at the core of most public health problems in developing countries  . The World Health Organization estimates that nearly 500 million people are confronted of infectious diseases of hydric origin, and that 20 million of these are dying, so that the microbiological quality of water remains the number one public health concern worldwide    . In addition, bacterial contamination in water is a natural phenomenon, in which humans act as primary conta- minants, but also as secondary receptors for bacteria present in the environment  . However, the preservation of water quality is necessary for sustainable development and health maintenance  . Unfortunately, in Africa south of the Sahara, more than a third of the population suffers from consequent diseases of the poor quality of this raw material essential for human life  . Thus, microbiological infections most common of these water-related diseases are caused by three main types of microorganisms found in water: bacteria, viruses and protozoa   . In view of the degradation of water quality, the first criterion for drinking water quality is the absence of bacterial contamination of fecal origin    . Belbedji the targeted area of our study, located in Niger, is almost completely served by drinking water from groundwater  . Among the bacteria present in the waters, the groups of total germs, total coliforms and E. coli are analyzed. Their dynamics were followed on the water standpipe and on the entire water chain of the thirty (30) sectioned families.
The purpose of this study is to determine the bacteriological quality of water by the study of the Microbiological Quality Index (MQI) in order to inform on the one hand the riparian populations that use it and on the other hand the Direction Belbedji Hydraulic and Sanitation Department (DDHA/B) and the Zinder Regional Hydraulic and Sanitation Directorate (DRHA/Z) on the bacteriological status of these waters, the sources of Contamination and the measures to be taken.
2. Materials and Methods
The study is centered on thirty (30) families selected for samplingand on ninety (90) samples, this sampling was done as described by the SEEN  . All these families obtain water from two standpipes in the town of Belbedji (Figure 3).
Within the framework of our study three bacteriological measurements were carried out  , that is respectively during the taking from thestandpipes, after the transport and after the storage of this water in the families in 2015.
In this study, the analyzed parameters are the total germs, total coliforms, fecal E. coli by the method of colimetry on membrane filter.
The method of data processing is based on the indication of fecal contamination (Bovesse and Depelchin, 1980), called the microbiological quality index (MQI). The MQI is calculated from water concentrations in total, fecal and E. coli coliforms.
Five concentration classes are defined for each of these parameters (Table 1). The MQI is the average of the class numbers of each parameter. The classification of the polluted parameters is carried out according to five quality classes (Table 2) corresponding to the standard colors (Figure 1).
Table 1. Quality classes corresponding to the different parameters.
Table 2. Classification of polluted parameters according to five quality classes (MQI). IQM Fecal contamination.
Figure 1. Quality classes corresponding to standard colors.
3. Outcome and Interpretation
Belbedji our study area is a local government located in the northwest of the Zinder region (Figure 2).
Figures 3-7 show the variations of physicalparameters and of the mineralization on the twostandpipeswhich serve the differentfamiliesselected.
Figure 8 shows the distribution of the different families selected for this study and sampled in the three phases.
We present interpretations of the calculated values of the microbiological water quality index from the results of the bacteriological analyzes of the water sampled at the different stages of the water chain in each family (Table 3).
The interpretation of the values of the microbiological quality index (MQI) to the water standpipes sampling after the transport and storage of water in families, which are sourced from standpoint, indicates The level of fecal contamination of water (Figures 9-11).
Figure 2. The geographical location of Belbedji local government.
Figure 3. pH variation on BF. The pH of these waters varies fromneutral to basic.
Figure 4. Conductivity variation on BF. The values of the conductivity show us that the mineralization of these waters varies frommoderate to strong  .
Figure 5. Temperaturevariation on BF.
Figure 6. LANGELIER index variation on BF. The analysis of these waters.in relation to the Langelier index shows us thatthese waters are aggressive.
Figure 7. Facies variation on BF. L’analyse du diagramme de piper nous montre que ces eaux sont de faciès bicarbonaté sodique. The analysis of the piper diagram shows thatthese waters have a sodium bicarbonate facies.
Figure 8. Location map of sample families.
Table 3. Values of the MQI at the water standpipe, after transport and storage of water.
Figure 10. Map of the variation in fecal contamination after water transport by families.
Figure 11. Map of the variation in fecal contamination after water storage in families.
sample and the storage. Thus, the quality of the water deteriorated during its transport and in a more pronounced way during its storage in the families.
The interpretation of the values of the microbiological quality index (MQI) to the water standpipe sample, after the transport and storage of water in the families, which are sourced from water standpipe 2, indicates The level of fecal contamination of water (Figure 12 and Figure 13).
On the whole families getting water supply from the standpipe 2, 4, 3 < MQI < 5, which means that fecal contamination is null to the taking of water from the standpipe 2 and after its transport. Hence a conservation of the microbiological quality of the water between its sampling at standpipe 2 and its transport. After storage of water, 13.33% of the families saw their MQI vary, of which 6.66% was 4.3 < MQI < 5 to 3.5 < MQI < 4.2, which means that fecal contamination has gone from null to low and the remaining 6.66% from 4.3 < MQI < 5 to 2.7 < MQI < 3.4, which means that this fecal contamination has gone from zero to moderate, A significant deterioration in the microbiological quality of water between standpipe 2 sampling and storage.
We see fecal contamination of water during transport and storage in families.
This deterioration in the quality of the water may be linked to pollution from
Figure 12. Map of fecal contamination variation at sample taking at water standpipe 2 and after transport of water by the families.
Figure 13. Map of fecal contamination variation after storage of water in the families.
the container used for transport, which on the one hand is not cleaned before use and, on the other hand, does not sometimes have an airtight lid. Another source of pollution is the person who carries, due to lack of hygiene.
This fecal pollution is due to the lack of use of soap by families after defecation and during water manipulation.
4. Conclusion and Recommendations
At the end of this study, we find that the water taken by 100% of families at the standpoints is free from fecal contamination. However, on 3.33% of families we see deterioration in the quality of the water after its transport, with the passage of fecal contamination from zero to low. Also on 16.66% of families we are witnessed deterioration in the quality of water after storage, with respectively the passage of fecal contamination from zero to low on 13.33% of families, and the passage of fecal contamination from zero to moderate on 3.33% of families.
Thus a water of good microbiological quality during its sampling can see its quality deteriorate during its transport and especially during its storage in the families.
This bacteriological pollution of water isanthropic in nature and islinked to the lack of hygiene of the populations thatmanipulateit.
These results should concern the structures concerned with the production of drinking water in the area studied, in particular the DDHA/B, the DRHA/Zet and the Ministry of Hydraulics and Sanitation. These structures must set up a Program of information, education and communication directed towards the populations to make them acquire behaviors favorable to the preservation, the potability of water from its source of supply until its consumption, to preserve peoples from diseases related to microbiological pollution of water that can lead to death.
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