Biological treatment of leachate from the uncontrolled landfill: evaluation of toxicity and heavy metals reduction

IF 1.3 4区环境科学与生态学 Q3 ECOLOGY Chemistry and Ecology Pub Date : 2023-05-24 DOI:10.1080/02757540.2023.2212658

N. Mherzi, F. Lamchouri, M. Lakhloufi, A. Zalaghi, H. Toufik

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引用次数: 1

Abstract

ABSTRACT This work assesses the efficiency of biological processes in reducing leachate toxicity, using tests of phytotoxicity, cytotoxicity and heavy metals assay. Concerning metal load of raw leachate, iron is the most abundant with a value of 77.23 mg/L; combined treatment is most effective in reducing metals with abatement rates of: Al (94.96%), Fe (99.23%), Pb (90.53%), Sn (90.25%) and Zn (90.43%). The phytotoxicity of raw leachate is total against all tested seeds, this phytotoxicity was decreased after treatment with SBR, and the germination indices are between 3.60%−65.36%, 0.25%−39.99% and 5.36%−35.55% respectively for Daucus carota, Lactuca sativa and Hordeum vulgare seeds. Leachate treated with the combined treatment exhibits no inhibition of germination even at concentrations of 100%. Regarding cytotoxicity assessed via Brine Shrimp test, raw leachates were cytotoxic killing all Artemia salina larvae even at low concentration of 1%. After the treatments, cytotoxicity of leachate was decreased especially in leachate treated by SBR and combination with inhibition percentages up to 16.66%. The experimental results obtained were confirmed using PCA which showed that the SBR and combination treatments have common purification characteristics and also the inverse correlation between heavy metal concentrations and germination indices indicate that these metals are involved in leachate toxicity.

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垃圾填埋场渗滤液的生物处理:毒性评价及重金属减少

本研究通过植物毒性、细胞毒性和重金属含量试验，评估了生物过程在降低渗滤液毒性方面的效率。生渗滤液的金属负荷中，铁含量最多，为77.23 mg/L;综合处理对金属的还原效果最好，铝(94.96%)、铁(99.23%)、铅(90.53%)、锡(90.25%)、锌(90.43%)的还原率最高。粗渗滤液对3种种子的植物毒性均为总毒性，经SBR处理后，种子的萌发指数分别为3.60% ~ 65.36%、0.25% ~ 39.99%和5.36% ~ 35.55%。混合处理的渗滤液即使在浓度为100%时也没有萌发抑制作用。盐水对虾细胞毒性试验表明，即使在低浓度1%的情况下，生渗滤液也具有杀死所有盐蒿幼虫的细胞毒性。处理后渗滤液的细胞毒性明显降低，尤其是SBR处理和联合处理的渗滤液，抑制率高达16.66%。主成分分析结果表明，SBR处理和组合处理具有共同的净化特性，重金属浓度与萌发指数呈负相关，表明重金属与渗滤液毒性有关。

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来源期刊

Chemistry and Ecology 环境科学-环境科学

CiteScore

4.20

自引率

16.00%

发文量

审稿时长

3.7 months

期刊介绍： Chemistry and Ecology publishes original articles, short notes and occasional reviews on the relationship between chemistry and ecological processes. This journal reflects how chemical form and state, as well as other basic properties, are critical in their influence on biological systems and that understanding of the routes and dynamics of the transfer of materials through atmospheric, terrestrial and aquatic systems, and the associated effects, calls for an integrated treatment. Chemistry and Ecology will help promote the ecological assessment of a changing chemical environment and in the development of a better understanding of ecological functions.