Soil and Agro Bio-engineering Lab, Department of Environmental Science, Tezpur University, Tezpur 784 028, India.
Department of Botany, Visva Bharati, Santiniketan, West Bengal 731235, India.
Bioresour Technol. 2020 Oct;314:123753. doi: 10.1016/j.biortech.2020.123753. Epub 2020 Jun 28.
Information on prospective metal remediation by Eudrilus eugeniae during vermicomposting of cotton textile sludge (CTS) is rather scarce. This investigation, therefore, evaluates the sanitization efficiency of this species in CTS and CTS + cow-dung (CD) based feedstocks against aerobic composting. Accordingly, reduction in Pb, Cd, Cr, and Zn concentrations was between 50 and 70% under vermicomposting. Budget equations substantiated that humic compound mediated chelation was the dominant route of metal removal, against nominal bioaccumulation by earthworms. Correlation statistics revealed that formation of humic compounds (humic acid, fulvic acid, and humin) greatly influenced the transition of toxic Cr to benign Cr during vermicomposting. Moreover, increase in total N content and P availability was significantly greater under vermicomposting than composting. Thus, E. eugeniae efficiently stabilized the feedstocks by reducing pH, Ca, S, and organic C and CTS + CD(2:1) was the most favorable feedstock for E. eugeniae vermicomposting in respect of metal detoxification and nutrient stabilization.
有关在蚯蚓堆肥处理棉纺织污泥（CTS）过程中通过 Eudrilus eugeniae 进行预期金属修复的信息相当匮乏。因此，本研究评估了该物种在 CTS 和 CTS+牛粪（CD）基饲料中的消毒效率，以对抗好氧堆肥。相应地，在蚯蚓堆肥处理下，Pb、Cd、Cr 和 Zn 浓度的降低幅度在 50%至 70%之间。预算方程证实，腐殖质化合物介导的螯合是去除金属的主要途径，而不是通过蚯蚓的名义生物积累。相关统计数据显示，在蚯蚓堆肥过程中，腐殖质化合物（腐殖酸、富里酸和腐殖质）的形成极大地影响了有毒 Cr 向良性 Cr 的转化。此外，蚯蚓堆肥中总 N 含量和 P 有效性的增加明显大于堆肥。因此，E. eugeniae 通过降低 pH 值、Ca、S 和有机 C 来有效稳定这些饲料，并且在考虑到金属解毒和养分稳定的情况下，CTS+CD（2:1）是最有利于 E. eugeniae 蚯蚓堆肥的饲料。
