Impact des rejets de la station d'épuration d'ElManchar sur la qualité des eaux souterraines (wilaya de Khenchela , Nord Est Algerien)
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Date
2012
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Abbes Laghrour University- Khenchela
Abstract
This work aims to assess the degree of contamination of groundwater in the area drained by the treated wastewater from
the sewage treatment plant with activated sludge of the city of Khenchela in physicochemical elements and the indicator elements
of pollution.
In a first step, we performed a physicochemical analysis of samples monthly water discharge of the sewage treatment plant.
The second step is intended for the analysis the groundwater of 17 water points distributed over the study area, two of
which are selected like witness for reason of his distance of the zone drained by the discharges.
In light of the results obtained, the treated wastewater, with the exception of biochemical demand for oxygen BOD5 and
total suspended matter levels and the salinity which present important contents, are suitable for reuse in irrigation.
The diagnostic quality of treated effluent shows that the original domestic and the contamination by metallic elements is
not a significant threat, continuation the accumulation of the latter in sludge.
The results of analyses of groundwaters clearly show a considerable accumulation of chlorides, sulphates, calcium,
ammonium and out of manganese whereas zinc, copper and iron record values which do not exceed the drinking water standards.
A deterioration of the quality of water was very remarkable meadows of the sewage treatment plant and downstream in the
direction of flow of the tablecloth what shows the infiltration of water of rejection towards the tablecloth.
The analysis of the principal components enabled us to make a distinction between two water classes, first is characterized
by a low salinity and free from undesirable elements, whereas the second is strongly mineralized and polluted. That is due to the
contributions of treated waste waters.