Effects of raw and treated landfill leachate on the chemical properties of a Tunisian soil
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(2020) 5:50
ORIGINAL PAPER
Effects of raw and treated landfill leachate on the chemical properties of a Tunisian soil Yosr Smaoui1 · Leila Chaari1 · Mariem Fersi2 · Kamel Gargouri3 · Jalel Bouzid1 Received: 25 July 2019 / Accepted: 8 July 2020 © Springer Nature Switzerland AG 2020
Abstract Landfill leachate (LFL) is a polluted effluent generated during the decomposition of organic wastes. Because it is rich in organic matter and nutrients, LFL can be used as an agricultural fertilizer, especially in arid and semiarid areas. In this context, the aim of this study was to evaluate the effects of LFL on the chemical properties of soil when LFL is used as a soil fertilizer. Leachate samples were collected from the Sfax landfill site in Tunisia, which has an area of 35 ha and receives 500 tons per day of solid wastes. Sandy soil was taken from an agricultural region of Sfax. Different treatments based on doses of 50, 80, and 100 m3/ha of raw and Fenton-treated leachate were added to the soil. The results showed that leachate amendment modified the chemical properties of the soil, which in turn depended on the concentration of the raw or treated LFL applied. The electrical conductivity of the soil increased significantly upon leachate addition, reaching values > 2 mS/ cm. A decrease in the soil pH and an enrichment of the soil with nutrients were also observed. The organic matter content of the soil increased by 0.3% and 0.24%, respectively, following treatment of the soil with 100 m 3 of raw and/or treated 3 leachate. A dose of 50 m /ha of raw leachate increased the level of potassium by 0.2 mg/g. The soil nitrogen level increased from 0.07% in control soil to 0.15% in soil treated with 100 m 3/ha of raw leachate. These results indicate that treatment with leachate improves soil fertility but can cause salinization if too much leachate is applied. Keywords Landfill leachate treatment · Fenton oxidation · Landfill leachate reuse · Soil properties · Soil fertility
Introduction Landfill leachate (LFL) generated by the decomposition of organic wastes in landfills is characterized by high salt and nitrogen levels and high organic loads. LFL also contains other chemicals that are leached from the nonorganic fraction of solid waste. This leachate is a source of environmental pollution that can have harmful effects on the ecosystem (Li et al. 2016) and must therefore be treated before Communicated by Mohamed Ksibi, Co-Editor in Chief. * Yosr Smaoui [email protected] 1
Laboratory of Environmental Engineering and Eco‑Technology, National School of Engineers of Sfax, University of Sfax, 3038 Sfax, BP, Tunisia
2
Algae Biotechnology Unit, National School of Engineers of Sfax, University of Sfax, 3038 Sfax, BP, Tunisia
3
Olive Institute, University of Sfax, Road of the aeroport ‑ Km 1.5 ‑ 3029 Sfax, Sfax, Tunisia
discharging it into the environment. Due to the complex composition of LFL, the treatment of this leachate is complicated and various processes must be implemented to reduce contaminant levels
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