Chemical treatment of acid mine drainage | |
| Author | Sawitree Singjan |
| Call Number | AIT Thesis no.EV-12-16 |
| Subject(s) | Acid mine drainage Sewage--Purification--Chemical treatment |
| Note | A thesis proposal submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Environment Engineering and Management |
| Publisher | Asian Institute of Technology |
| Abstract | Acid mine drainage (AMD) is one largest of environment problems now effecting entire world that associated with mining activity. AMD can cause several impacts to not only environment but also human health. Therefore, treatment of AMD is relatively importance to reduce the impact of AMD. Chemical treatment has effectiveness to remove a variety of contaminants. The purpose of this research is to study active and passive chemical treatment of AMD of Ban Hong coal mine. For the active treatment, the experiments were conducted to define form of lime including powder form and slurry form required to increase the mine water pH and influence of pH on metals precipitation with mixing. Passive chemical treatment was carried out to define types and addition methods of neutralizing agents that required improving the pH of AMD without mixing. Two different neutralizing agents chose for the passive treatments were lime and crushed dust. Investigation metals and sulfate removals efficiency also were done in this experiment. As the result, the uses of slurry lime can increase the water pH higher than powder lime. 0.9, 1.1, 1.3, 1.9 and 3.3 times of the calculated dose was able to increase the pH to 6-10.55. In different range of pH can decrease the content of iron, manganese, zinc and copper in different efficiency. For example, at the pH range 7.1-7.8, Mn removal efficiency by using powder or slurry lime was reduced by 27%-34%. It showed slightly higher removal efficiency than lower pH (6.6-6.8). Moreover, at higher pH range including 8.3-8.8, 9.26-9.31 and 10.42-10.55 removed Mn 47%-50%, 88%-99% and >99%, respectively. Furthermore, partial sulfate can be removed by lime as gypsum. Increasing pH between lime and crushed dust was compared in passive chemical treatment, the result shown that lime was able to improve the pH higher than crushed dust in all experiments. Periodically addition of lime and crushed dust can improve the pH of water level better than once time addition. |
| Year | 2012 |
| 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 (EV) |
| Chairperson(s) | Annachhatre, Ajit P.; |
| Examination Committee(s) | Visvanathan, C.;Preeda Pakpian; |
| Scholarship Donor(s) | Royal Thai Government Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2012 |