Integrated bioprocess for Se(VI) remediation using duckweed: Coupling selenate removal to biogas production

被引：0

作者：

Kotamraju A. ^{[1
]}

Logan M. ^{[1
]}

Lens P.N.L. ^{[1
]}

机构：

[1] National University of Ireland, Galway, Galway

来源：

Journal of Hazardous Materials | 2023年 / 459卷

基金：

爱尔兰科学基金会;

关键词：

Anaerobic digestion; Integrated process; Methane; Phytoremediation; Pre-treatment; Selenium;

D O I：

10.1016/j.jhazmat.2023.132134

中图分类号：

学科分类号：

摘要：

The use of phytoremediation as a method for wastewater treatment or removal of pollutants is garnering significant interest and duckweed (DW), a free floating macrophyte, depicts significant potential for the removal of nutrients and toxic compounds from contaminated waters. The present work aimed to develop an integrated process for remediating selenate (Se(VI)) using DW biomass and subsequent use of Se(VI) enriched DW for biogas production. The main objective is to extend the application of selenium (Se) enriched DW biomass for biogas production. Se(VI) enriched DW biomass (Se-DW) gave higher methane production (48.38 ± 3.6 mL gCOD−1) than control DW biomass (C-DW) (24.46 ± 3.6 mL gCOD−1). To further enhance methane production, three pre-treatment approaches (acid, alkali and hydrothermal) were assessed and the solid and liquid fractions obtained after pre-treatment were used as a substrate. Pre-treatments increased biogas production in both Se-DW and C-DW than untreated conditions. Liquid fractions gave higher biogas production than solid fractions. In Se-DW, highest biogas production was observed in hydrothermal pre-treated Se-DW, while in C-DW, acid pre-treatment gave higher biogas production. Methane production was shown to be enhanced up to a Se(VI) concentration of 1.7 mg L−1, whereas a concentration beyond this lowered biogas production. © 2023 The Authors

引用

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