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Toxic risk evaluation of effluents from a swine biodigester in the plant models Lactuca sativa and Allium cepa

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Abstract

Pig farming is recognized as an activity with great polluting potential. The aim was to investigate possible environmental risks of effluents from the stabilization pond (SP) and the raw effluent (RE) from the biodigestion process of swine residues, in different concentrations in the models Lactuca sativa and Allium cepa. Seeds were germinated in different dilutions, 100% (C1), 50% (C2), 25% (C3), 12.5% (C4), 6.25% (C5), 3.12% (C6), 0.78% (C7), and 0.39% (C8). Distilled water was used as the negative control (CN) and trifluralin (0.84 g/L−1) as the positive control. Germination (GR), root growth (RG), cell cycle, and oxidative stress (OS) were analyzed. To assess OS, the activity of the enzymes superoxide dismutase (SOD), catalase (CAT), and glutathione S-transferase (GST) and the quantification of glutathione (GSH) and lipid peroxidation (LPO) were analyzed. Data were submitted to ANOVA (one way), followed by the Kruskal-Wallis mean test (P ≤ 0.05). Chemical analysis showed high values of Cu, Fe, Mn, and Zn. Dilutions (C1, C2, C3 RE) and (C1 and C2 SP) inhibited GR and RG of L. sativa and A. cepa than other concentrations. The mitotic index showed a reduction in C5 (RE), C6, and C7 (SP) of L. sativa and C3 and C4 (SP) of A. cepa in relation to CN and higher frequencies of chromosomal alterations. Regarding the OS, only the concentrations of SP treatment showed statistical difference in relation to the NC: in L. sativa model, GSH at (C5 and C8) concentrations and LPO (C7); in A. cepa model, SOD (C3 and C4), GST (C4, C5 and C6), GSH (C5 and C8), and CAT (C3 and C7). The alterations in metabolism are possibly related to the metals, such as zinc and copper, observed in high amounts in the raw waste. The results allowed us to conclude that the raw and stabilization pond effluents offer environmental risks, requiring caution and monitoring in the use of these effluents.

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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

Research grant funded by the Coordination for the Improvement of Higher Education Personnel (CAPES).

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FBA analyzed and interpreted the germination, root growth, and cell cycle data, as well as performed an interpretation of the other data in the article, and was responsible for writing the manuscript. ING and KDG contributed to the analysis of germination, root growth, and cell cycle. EJRC and MMB performed the analysis of biochemical biomarkers. TTDS performed the analysis of the chemical characterization of the effluents. STM and MNF contributed to the writing of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Francielen Barroso Aragão.

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Aragão, F.B., Galter, I.N., Grecco, K.D. et al. Toxic risk evaluation of effluents from a swine biodigester in the plant models Lactuca sativa and Allium cepa. Environ Monit Assess 196, 64 (2024). https://doi.org/10.1007/s10661-023-12173-x

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  • DOI: https://doi.org/10.1007/s10661-023-12173-x

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