Valorisation des boues résiduaires de la station d’épuration de Tiaret pour l’agriculture

Abstract

In agriculture, sewage sludge is used as fertilizer to rehabilitate poor soils and replace synthetic fertilizers. These sludges can be used to improve the physico-chemical characteristics of the soil, promote microbial life and increase plant production, where they contain primary nutrients and organic matter. The objective of this work is to study the impact of the treatment of sewage sludge on the physico-chemical characteristics of the soil, but also on the growth of the tomato Solanum lycopersicum. The experiment consists of using a sludge-soil mixture, with different fractions of sewage sludge: soil control (0% sludge), 20% sludge, 40% sludge, 60% sludge, 100% sludge. Biometric measurements (height, stem diameter and number of leaves) were performed on the tomato. The results showed good fertilizing properties of a sludge/soil mixture with the 60% sludge fraction. However, the tomato that grew on the 40% fraction had better growth and high foliage compared to plants on the other fractions. The spreading of sludge provides a soil amendment and an additional supply of nutrients for tomatoes. The use of 40% fraction of sludge spreading for the cultivation of this plant can maintain better soil fertility while reducing the risk of accumulation of heavy metals.