Effect of reactive bed mineralogy on arsenic retention and permeability of synthetic arsenic-containing acid mine drainage

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:394

Article

Liu, Jing^1,2  Cheng, Hongfei^2,3  Zhao, Fenghua²  Dong, Faqing¹  Frost, Ray L.³ 

[1] SW Univ Sci & Technol, Minist Educ, Key Lab Solid Waste Treatment & Resource Recycle, Mianyang 621010, Peoples R China

[2] China Univ Min & Technol, Sch Geosci & Surveying Engn, Beijing 100083, Peoples R China

[3] Queensland Univ Technol, Fac Sci & Engn, Sch Chem Phys & Mech Engn, Brisbane, Qld 4001, Australia

关键词: Arsenic;    Acid mine drainage;    Remediation;    Permeability;   

DOI  :  10.1016/j.jcis.2012.12.014

来源: Elsevier

【 摘 要 】

Successive alkalinity producing systems (SAPSs) are widely used for treating acid mine drainage (AMD) and alleviating clogging commonly occurring in limestone systems due to an amorphous ferric precipitate. In this study, iron dust, bone char, micrite and their admixtures were used to treat arsenic-containing AMD. A particular interest was devoted to arsenic removal performance, mineralogical constraints on arsenic retention ability and permeability variation during column experiment for 140 days. The results showed that the sequence of the arsenic removal capacity was as follows: bone char > micrite > iron dust. The combination of 20% v/v iron dust and 80% v/v bone char/micrite columns can achieve better hydraulic conductivity and phosphorus-retention capacity than single micrite and bone char columns. The addition of iron dust created reductive environment and resulted in the transformation of coating material from colloidal phase to secondary mineral phase, such as green rust and phosphoerrite, which obviously ameliorates hydraulic conductivity of systems. The sequential extraction experiments indicated that the stable fractions of arsenic in columns were enhanced with help of iron dust compared to single bone char and micrite columns. A combination of iron dust and micrite/bone char represented a potential SAPS for treating As-containing AMD. (C) 2012 Elsevier Inc. All rights reserved.

【 授权许可】

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