Cadmium remobilization from contaminated soil : a case study in Maesot District, Tak Province, Thailand | |
| Author | Chatinai Chusai |
| Call Number | AIT Thesis no.EV-06-6 |
| Subject(s) | Cadmium Soil pollution--Thailand--Tak |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering Inter-University Program on Environmental Toxicology, Technology and Management, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Highly cadmium contamination in Maesot district, Tak province of Thailand had revealed by the study of the International Water Management Institute (IMWI) in 1998. Rice and water supply from this area have the concentration of cadmium higher than the standard. In this study the concentration of cadmium contaminated in the soil was measured by Inductively Coupled Plasma Optical Emission Spectrometer, and the average value of cadmium concentration in the soil is 26.64 mg/Kg. This value is eight times higher than the standard value for cadmium concentration allowed in any agriculture soil which is set at 3 mg/Kg. Not only the soil, but also the crops from this area which were determined the concentration of cadmium in their biomass. For corn seed and green bean, the concentration of cadmium in the edible parts were not detectable. However, in the edible part of leafy vegetables the average value is higher than the standard value for cadmium contamination allowed in food and additives which is set at 0.2 mg/Kg. Environmental conditions likes pH value, Oxidation Reduction Potential and organic matter in the soil are the main parameters which could change the form of metal fraction of cadmium to the mobile form. The accumulation of cadmium in mobile form decrease in order; leafy vegetables > root vegetables > grain crops. So, the crops that should he allowed to produce in this area are grain crops like corn and bean A lab scale of cadmium remobilizing test (remediation potential) was also carried out using cadmium contaminated soil by lowering the soil pH from 7 to 4. Soil acidification has proved to influence cadmium transportation and induced speciation changed from insoluble fraction to soluble fraction which are more solubility and easily remobilized. Cadmium was removed from the contaminated soil from 3 ppm down to 0.5 ppm which is accounted for 83% cadmium removal. Thus the soil become clean and having cadmium in a safety range for agriculture |
| Year | 2006 |
| 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) | Preeda Parkpian; |
| Examination Committee(s) | Visvanathan, C. ;Jutamad Satayavivad; |
| Scholarship Donor(s) | Chulabhorn Research Institute Mahidol University AIT Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2006 |