Characterization and valorization of drinking water sludges applied to agricultural spreading

Our study delved into drinking water sludges at the treatment plant of bouregreg. two sampling campaigns were carried out at the s2 station's sludge bed decanter during the months of may and june 2012. the sludges were limed at different concentrations to increase their agronomic value in landfarming. the analysis of the sludges physico-chemical characteristics showed an important increase in dryness after liming which facilitates their handling and management. on the other hand,liming allowed a stabilization of organic matter. in fact,the increase in ph gave drinking water sludge a very good calcium amendment status by increasing the calcium level. trace element levels are still below the recommended mte limits for agricultural spreading. moreover,these sludges reveal a very high hygienisation in terms of pathogens. thus,these results demonstrated that drinking water sludges at the station of bouregreg showed significant agronomic characteristics that are perfectly suitable for agricultural spreading.