Enhancement of Soil Arsenic Mobilization through Hydrochar from Arsenic-Contaminated Boehmeria Nivea: Roles of Alkali-Modification and Soil Microbial Modulation
Yaqun Qiu 1,2
More details
Hide details
College of Forestry, Central South University of Forestry and Technology, Changsha 410004, Hunan, China
Hunan Provincial Key Laboratory of Water Pollution Control Technology, Hunan Academy of Environmental Protection Sciences, Changsha 410004, Hunan, China
Hunan Center of Ecological Environment Affairs, Changsha 410000, Hunan, China
School of Materials and Chemical Engineering, Hunan City University, Yiyang 413000, Hunan, China
College of Environment and Ecology, Hunan Agricultural University, Changsha 410000, Hunan, China
Submission date: 2023-12-11
Final revision date: 2024-01-10
Acceptance date: 2024-01-26
Online publication date: 2024-06-18
Publication date: 2024-07-12
Corresponding author
Shizhi Wen   

College of Forestry, Central South University of Forestry and Technology, Changsha 410004, Hunan, China
Lin Chen   

Hunan Center of Ecological Environment Affairs, 410004, Changsha, China
Pol. J. Environ. Stud. 2024;33(5):5829-5842
The reuse of heavy-metal hyperaccumulator waste has emerged as a critical constraint in the implementation of phytoremediation to control heavy-metal pollution. Ramie (Boehmeria nivea) is a wellestablished arsenic (As) hyperaccumulator that has been widely used in the remediation of As-contaminated sites in recent years. To facilitate multipurpose development and the recycling of ramie straw contaminated with heavy metals, a study investigated the preparation of hydrochar (HC) at different temperatures and assessed the feasibility of reintroducing the HC into the soil. The results indicated higher yields, increased nutrient contents, and reduced As percentage levels at a hydrothermal carbonization temperature of 240℃. Treatment with a 300 mmol/L sodium hydroxide solution resulted in the removal of As from HC, ranging from 77.06% to 87.60%, effectively facilitating the reuse of HC. The application of alkali-modification HC in As-contaminated soil not only enhances soil properties but also augments the potential population of dominant microorganisms that promote soil arsenic mobilization, thereby improving arsenic mobilization capacity in mining soil. This study offers a viable strategy for enhancing the phytoremediation efficiency of As-contaminated soil and establishing a recycling system for As hyperaccumulator resources in the future.
Journals System - logo
Scroll to top