Journal Algérien des Régions Arides
Volume 16, Numéro 1, Pages 85-91
2023-07-22
Evaluation Of The Potential For Recovery Of Sludge From The Sidi El Khattab (relizane) Wastewater Treatment Plant In Agriculture
Authors : Belhaouari Benkhedda .
Abstract
The studies of valorization of the resources resulting from the treatment of waste water are directed more on the use of the treated water. Our study aims to evaluate the potential of valorization of the sludge of wastewater treatment plants in agriculture. This study was conducted to evaluate the effect of the waste sludge obtained from the water treatment plant of Sidi El khattab (Relizane) on the growth of tomato and soil biology. The sludge was characterized, then applied in the soil at different doses: 1, 2.5, 5, 7.5 and 10%. Morphological parameters (shoot height and dry biomass) were analyzed after using the sludge as fertilizer. The soil microorganism respiration test was performed to measure the impact of the sludge on the soil. Low levels of heavy metals were detected in the sludge (zinc: 20.19, lead: 09.12, copper: 9.12 and cadmium: 2.37 mg/kg DM), an organic matter content of 62.4 % and a total nitrogen content of 1.2 %. Application of sewage sludge to the soil improved tomato dry biomass from the 2.5% rate and shoot height from the 10% rate. Measurement of CO2 release rate by soil microorganisms showed no negative effect of sludge on soil microbial respiration. The results obtained showed that the sludge from the sewage treatment plant of Sidi El khattab (Relizane) are rich in fertilizing elements usable by crops and harmless for soil biology.
Keywords
Soil ; Fertilizer ; Tomato ; Sludge
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