Unravelling the detoxification trail of potential toxic heavy metals: an insight into heavy metal auditing and ecological health upon valorisation by Lampito mauritii and Eudrilus eugeniae.

IF 5.8 3区 环境科学与生态学 0 ENVIRONMENTAL SCIENCES Environmental Science and Pollution Research Pub Date : 2024-11-11 DOI:10.1007/s11356-024-35417-w
Inrikynti Mary Kharmawphlang, Hemen Deka, Nazneen Hussain
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Abstract

Evidence on prospective remediation of municipal solid waste contaminated with toxic heavy metals by Eudrilus eugeniae (Eu) and Lampito mauritii (L) is very scarce and yet to be explored. In this study, heavy metal detoxification potential of E. eugeniae and L. mauritii in municipal solid waste (MSW) + cowdung (CD) (3:1)-based feedstocks were investigated against Eisenia fetida (E) (a well-known vermi-remediator) and aerobic composting. Excellent reduction (70.01-93.04%) of potentially toxic heavy metals (PTHMs) (Pb, Cr, Cd and Zn) were evident in both E. eugeniae and L. mauritii employed treatments. Moreover, the results on heavy metal budget quotient clearly demonstrated the unique detoxification route undertaken by E. eugeniae and L. mauritii via humic composite facilitated chelation over the nominal bioaccumulation pathway. The principal component analysis (PCA) confirmed the strong negative correlation between the heavy metal (HM) level in earthworm gut and MSW substrate, whereas a strong positive correlation between humic substances and HM remediation. Furthermore, analysis of ecological health parameters indicated substantial reduction of environmental risk and guaranteed negligible risk of PTHM if utilized as manure. Moreover, significant increment in total N content (3.2-3.8-fold), available P (4-5.9-fold), exchangeable K (3.66-fourfold) and enzyme activity along with significant reduction of TOC (~ 87%) confirmed E. eugeniae and L. mauritii could effectively stabilize MSW. Thus, the metal-binding potential of humic substances produced by earthworms during the detoxification of municipal solid waste (MSW), coupled with a metal budget analysis, has offered valuable insights into the usage of E. eugeniae and L. mauritii as effective contenders for sanitizing heavy metal-laden MSW.

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揭示潜在有毒重金属的解毒线索:通过 Lampito mauritii 和 Eudrilus eugeniae 对重金属审计和生态健康进行评估。
有关 Eudrilus eugeniae(Eu)和 Lampito mauritii(L)修复受有毒重金属污染的城市固体废物的前瞻性证据非常稀少,有待探索。本研究以城市固体废物(MSW)+牛粪(CD)(3:1)为基础原料,研究了 E. eugeniae 和 L. mauritii 对 Eisenia fetida (E)(一种著名的蚯蚓修复剂)和好氧堆肥的重金属解毒潜力。在 E. eugeniae 和 L. mauritii 的处理中,潜在有毒重金属(PTHMs)(铅、铬、镉和锌)的减少量(70.01%-93.04%)都非常明显。此外,重金属预算商数的结果清楚地表明,E. eugeniae 和 L. mauritii 通过腐殖质复合材料促进螯合的独特解毒途径超过了名义上的生物累积途径。主成分分析(PCA)证实,蚯蚓肠道中的重金属(HM)含量与都市固体废物基质之间存在很强的负相关,而腐殖质与重金属修复之间存在很强的正相关。此外,生态健康参数分析表明,如果将蚯蚓用作肥料,环境风险将大大降低,并保证 PTHM 的风险可以忽略不计。此外,总氮含量(3.2-3.8 倍)、可利用磷(4-5.9 倍)、可交换钾(3.66-4 倍)和酶活性的大幅增加以及总有机碳的显著减少(约 87%)证实了 E. eugeniae 和 L. mauritii 能有效稳定城市固体废物。因此,蚯蚓在城市固体废物(MSW)解毒过程中产生的腐殖质的金属结合潜力,再加上金属预算分析,为利用 E. eugeniae 和 L. mauritii 作为消毒含重金属的城市固体废物的有效竞争者提供了宝贵的见解。
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来源期刊
CiteScore
8.70
自引率
17.20%
发文量
6549
审稿时长
3.8 months
期刊介绍: Environmental Science and Pollution Research (ESPR) serves the international community in all areas of Environmental Science and related subjects with emphasis on chemical compounds. This includes: - Terrestrial Biology and Ecology - Aquatic Biology and Ecology - Atmospheric Chemistry - Environmental Microbiology/Biobased Energy Sources - Phytoremediation and Ecosystem Restoration - Environmental Analyses and Monitoring - Assessment of Risks and Interactions of Pollutants in the Environment - Conservation Biology and Sustainable Agriculture - Impact of Chemicals/Pollutants on Human and Animal Health It reports from a broad interdisciplinary outlook.
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