Title: Toxicity of landfill leachate with Solanum lycopersicum

Authors: Elisângela Maria da Silva; Naiara Angelo Gomes; Samanda Costa do Nascimento; Jeovana Jisla das Neves Santos; Amanda Bezerra de Sousa Pino; Márcio Camargo de Melo; Veruschka Escarião Dessoles Monteiro

Addresses: Department of Civil and Environmental Engineering, Universidade Federal de Campina Grande, Campina Grande 58429-900, Brazil ' Department of Civil and Environmental Engineering, Universidade Federal de Campina Grande, Campina Grande 58429-900, Brazil ' Department of Civil and Environmental Engineering, Universidade Federal de Campina Grande, Campina Grande 58429-900, Brazil ' Department of Civil and Environmental Engineering, Universidade Federal de Campina Grande, Campina Grande 58429-900, Brazil ' Department of Civil and Environmental Engineering, Universidade Federal de Campina Grande, Campina Grande 58429-900, Brazil ' Department of Civil and Environmental Engineering, Universidade Federal de Campina Grande, Campina Grande 58429-900, Brazil ' Department of Civil and Environmental Engineering, Universidade Federal de Campina Grande, Campina Grande 58429-900, Brazil

Abstract: This study aimed to analyse the landfill leachate toxic potential. In natura leachate and pond leachate (L1) samples were collected to carry out not only phytotoxicity tests on Solanum lycopersicum to evaluate the relative seed germination (RSG), the relative root growth (RRG) and the germination index (GI), seeds, but also the pH and total ammoniacal nitrogen (TAN) analysis. The leachate pH presented values above 7, inducing a greater dissolved substances load. The high TAN levels (mean values of 1,526.00 mgNL^-1 in natura effluent and 888.30 mgNL^-1 in L1), contributed to greater toxicity, reducing the relative tomato seed germination (RSG-T), indicating a highly phytotoxic leachate. There was a reduction in the relative tomato root growth (RRG-T), which ranged from moderately phytotoxic to phytotoxic. There was no statistically significant difference between the phytotoxicity of the in natura leachate and that from L1. The leachate treatment was not enough to adapt the effluent to the standards required by the Brazilian legislation, as well as to remove its toxic components.

Keywords: urban solid waste; USW; bioindicators; phytotoxicity; toxic potential; leachate treatment.

DOI: 10.1504/IJEWM.2025.145030

International Journal of Environment and Waste Management, 2025 Vol.36 No.3, pp.336 - 351

Accepted: 13 Jan 2023
Published online: 17 Mar 2025 *

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