Removal of heavy metals from acid mine drainage using mixed organic and inorganic media in permeable reactive barriers | |
| Author | Suchanya Wongrod |
| Call Number | AIT Thesis no.EV-15-22 |
| Subject(s) | Sewage--Purification--Heavy metals removal Acid mine drainage Heavy metals |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Environment al Engineering and Management |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-15-22 |
| Abstract | Acid mine drainage (AMD) contained toxic trace metals, low pH and high concentration of sulfate which results in various environmental problems through human, animal and ecosystem. Therefore, the development of treatment technology for AMD remediation should be achieved to eliminate and reduce these impacts. One of the passive treatment technologies for treating AMD is Permeable Reactive Barriers (PRB). It can remove various contaminants effectively with low cost in construction and operation compared to other technologies. The purpose of this research was to develop an appropriate PRB system for treating acid mine drainage (AMD) using the mixture of organic material; pig farm wastewater treatment sludge, rice husk and coconut husk chip, and inorganic material; bottom ash, fly ash and bentonite clay in the optimum ratio obtained from previous studies of Kijjanapanich, 2010, Pakdeerattanamit, 2011 and Orakwue, 2014. The specific purpose was to compare heavy metal removal and sulfate reduction efficiency in continuous experiment between vertical and horizontal reactors using the optimum ratio of organic and inorganic material mixture in the ratio of P 30% : R 10% : C 10% : BA 30% : FA 10% : BA 10% by volume. The HRT value was 12 hours and flow rate was 60 ml/hr. The concentrations of sulfate were reduced from 757 mg/L to 666 mg/L in a horizontal reactor and 671 mg/L in a vertical reactor. Iron concentrations decreased from 30 mg/L to approximately 0.083 mg/L in the vertical reactor and 0.057 mg/L in the horizontal reactor. The concentrations of copper and zinc reduced from 20 mg/L and 5 mg/L to around 0.0135 mg/L and 0.0625 mg/L, respectively in both horizontal and vertical reactors. The concentration of manganese in a horizontal effluent diminished from 20 mg/L to 4.65 mg/L while there was only 2.7 mg/L remained in a vertical effluent. Manganese reduction rate in the horizontal and vertical effluents were around 86.5% and 76.7%, respectively while the removal rates of iron, copper and zinc in both horizontal and vertical reactors were approximately 99.7%, 99.9% and 98.7%, respectively. The breakthrough curves of manganese at the bed depth 12.5 cm and 25.0 cm were obtained in horizontal and vertical reactors. The sorption capacity of manganese was obtained at the bed depth of 12.5 cm and 25.0 cm in both reactors and there was the maximum sorption capacity at sampling point 25.0 cm of the vertical reactor with the percentage removal of 91% and the sorption capacity of 2.971 mg/g. |
| Year | 2015 |
| 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) | Annachchtre, Ajit P.; |
| Examination Committee(s) | Nguyen, Thi Kim Oanh;Shipin, Oleg V.; |
| Scholarship Donor(s) | Thailand (HM Queen); |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2015 |