Selection of solid media in permeable reactive barrier for removal of heavy metals from acid mine drainage | |
| Author | Nguyen Dan Bao Linh |
| Call Number | AIT Thesis no.EV-13-17 |
| Subject(s) | Heavy metals--Environmental aspects Acid mine drainage--Environmental aspects |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Environmental Engineering and Management |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-13-17 |
| Abstract | The permeable reactive barrier (PRB) is employed for the remediation of acidic leachate and contaminated groundwater (Komnitas et al., 2004). This study aimed at evaluating the adsorption capacity of four kinds of media: activated charcoal, natural clay, coal fly ash and bottom ash for remediation heavy metals in synthetic single component solution, for their possible use in PRB. Leaching of heavy metals from these media was investigated initially. The leachability of elements in acidic columns was higher than neutral columns for each media. Among four media, natural clay and bottom ash were leached out elements more than activated charcoal. The leachate contained heavy metal concentration higher than standard limitation in acidic column leaching test. Investigations on adsorption capacity and kinetics of adsorption were undertaken. According to equilibrium studies, the selective sequence followed was: Fe3+> Cu2+> Zn2+> Mn2+. Natural clay and fly ash showed higher adsorption capacity as compared to bottom ash and activated charcoal. The adsorption isotherms were fitted with Langmuir and Freundlich isotherm. Langmuir isotherm plots showed a good fit with experimental data compared to Freundlich isotherm plots. Batch adsorption studies showed rapid uptake of heavy metals in general for the first 60 minutes for all media. After this initial period, the uptake rate seemed to be slower. Pseudo-second order reaction kinetic adequately described the mechanism through chemi-sorption. |
| Year | 2013 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Annachhatre, Ajit P.; |
| Examination Committee(s) | Thammarat Koottatep;Nguyen, Thi Kim Oanh; |
| Scholarship Donor(s) | Greater Mekong Subregion (GMS) Scholarship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2013 |