Research and application of arsenic-contaminated groundwater remediation by manganese ore permeable reactive barrier. Issue 13 (7th June 2021)

• Record Type: Journal Article
• Authors: Li, Yao; Huang, Yongbing; Wu, Weishan; Yan, Mengmeng; Xie, Yiting
• Is Part Of: Environmental technology. Volume 42:Issue 13(2021)
• Page Start: 2009
• Page End: 2020
• Publication Date: 2021-06-07
• Subjects: PRB -- arsenic -- manganese ore -- groundwater -- adsorption; Environmental engineering -- Periodicals; Environmental protection -- Periodicals; 628.05
• DOI: 10.1080/09593330.2019.1687587
• Languages: English
• ISSNs: 0959-3330

Abstract

ABSTRACT: Arsenic pollution in the water environment is one of the important environmental problems at present. High arsenic groundwater and its resulting local arsenic poisoning have caused a great threat to human life and health. The permeable reactive barrier (PRB) is an underground in-situ remediation technology, which has the advantages of high efficiency, low energy consumption, long aging, low operating and maintenance costs. By studying the arsenic removal effects of different materials, this paper selected natural manganese ore, manganese ore granulation, loaded manganese ore and mixed manganese ore as fillers for PRB. And it conducted a simulated experiment to study the feasibility of actual PRB engineering to repair arsenic-containing groundwater. The experiment proves that the removal rate of arsenic by four manganese ore materials exceeds 90%. After examining the geographical location and hydrogeological conditions of the PRB project, the Dengjiatang area of Chenzhou City, Hunan Province was selected as the construction area. Studies show that after the completion of PRB, the arsenic content of the effluent at each monitoring point is below 10 μg/L. It indicates that all four fillers achieve the purpose of removing arsenic, and can be applied to the project according to actual needs. Finally, the safety evaluation of the PRB project was carried out. And FeCl3 ·6H2 O was selected as the base curing material and cement was as the process auxiliary stabilizer to solidify the arsenic-containing waste residue. The arsenic concentration in the leaching solution of the arsenic slag after curing is only 1 μg/L. GRAPHICAL ABSTRACT: UF0001