Caractérisation Et Aptitude À L’irrigation Des Eaux Usées De Quelques Agglomérations De La Willaya De Khenchela

Résumé: Problems of water scarcity and degradation have led to increased interest in the reuse of treated and untreated wastewater in many countries around the world. The objective of this study is to evaluate the environmental risks of raw wastewater by knowing the physical and chemical properties of the waters used for irrigation without treatment. The results of the physicochemical analysis of the raw wastewater of 3 points that represent the Chechar, Nsigha and El Hamma cities showed significantly higher levels compared to Algerian and international standards. The recorded values of the electrical conductivity are between 750 and 2250 micro-Siemens per centimeter which makes it possible to classify them under the category of strongly mineralized waters not suitable for irrigation. The calculation of the COD / BOD5 and BOD5 / COD ratios reveals the domestic origin of these effluents and their biodegradability. The alkalizing power is low and the risks on the physical properties of the soil are low. On the other hand, the risks presented by these effluents discharged without treatment for the environment are accentuated by the presence of metallic trace elements whose contents exceed the standards.

Publié dans la revue: