Effects of Irrigation with Treated-Filtred Waters on Some Agri-Food Products(The Region of Ouargla Agérie as a Case Study)

Abstract

The reuse of treated wastewater can reduce the water deficit in Saharan areas, particularly in Ouargla which has experienced a serious problem of water surplus, caused by a topographically flat land level, as well as the discharge of agricultural drainage water, which raises the groundwater level. The construction of a sewage treatment plant in Sidi Khouilid is part of governmental projects to capture and lower the level of the water table.The history of the microbiological and physico-chemical analyzes confirm that the quality of the waters of the SIDI KHOUILED treatment plants are currently very polluted with a very high rate of microbiological materials and extremely rich in salts, and the presence of various germs 'coliforms, streptococci and Clostridium' in very significant numbers.

Consequently it is very important to have additional treatment of purified water from STEPs to ensure a quality of purified water that complies with irrigation standards, and to ensure good discharge into the natural environment.In our experiment, we have treated the water with using a sand filter, which in turn gave good results.Microbiological analyzes of plants irrigated with purified-filtered water mixed with borehole water indicate the lack of faecal coliforms, streptococci and Clostridium in samples of Batavia lettuce and local chard.