Removal of endosulfan-additional POPs from contaminated sediment by low density polyethylene (LDPE) pellets | |
| Author | Naraporn Glanpracha |
| Call Number | AIT Thesis no.EV-09-15 |
| Subject(s) | Endosulfan Contaminated sediments |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Environmental Engineering Management Inter-University Program on Environmental Toxicology, Technology and Management |
| Publisher | Asian Institute of Technology |
| Abstract | This study aimed to evaluate low density polyethylene (LDPE) pellets material for clean up sediment contaminated by endosulfan. Optimum condition for desorption endosulfan from contaminated sediment studied on four different ratios of pellets: dry spiked sediment at 10 mg/kg (1:5, 1:10, 1:20, 1:30 w/w) were employed. Sediment and LDPE pellets were collected at different time intervals; 7, 14 and 30 days. Soxhlet extraction technique was used for sediment and LDPE pellets extraction, and gas chromatography with electron capture detector (GC-ECD) was applied for endosulfan determination. The optimum condition to clean up endosulfan contaminated sediment had been found (>92 % removal) at ratio between LDPE pellet: spiked sediment at 1:5 (w/w) with removal time 7 days. Effect of sediment properties on endosulfan desorption was studied in different types of sediment base on clay content and organic matter. In criteria for clean up the contaminated sediment under this condition was proposed at ratio of LDPE pellet: dry spiked sediment 1:5 (w/w) with removal time 7 days has effectively removed total endosulfan in contaminated sediments in the order; sandy clay, sandy clay loam, silty clay loam and clay soil with percentage removal 100, 92, 73, and 36-54, respectively. The results of endosulfan desorption were found in the order; sandy clay, sandy clay loam, silty clay loam and clay soil. It implied that decrease in organic matter and clay content in sediment increased desorption of α-endosulfan and β-endosulfan. The higher correlation coefficient of clay content than that in organic matter indicated that clay content is more correlated with percentage removal than organic matter. It inferred that clay content seemed to be more influence on adsorption and desorption than organic matter. The efficient reusability of LDPE pellets was mainly governed by properties and structure of LDPE. The results showed that used LDPE pellets have efficiency to remove endosulfan from sediment more than 5 cycles. Under extraction condition applied in this experiment, endosulfan in LDPE pellet was extracted by solvent solution(hexane: acetone 1:1) in a soxhlet apparatus at 70 °C for 16 hr. Base on physical properties of LDPE, it indicated that no change in structure of used LDPE pellets because of this, such pellets still have full capacity to be reused and removed endosulfan from contaminated sediment. |
| Year | 2009 |
| 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) | Preeda Pakpian; |
| Examination Committee(s) | Annachhatre, Ajit P.;Jutamaad Satayavivad; |
| Scholarship Donor(s) | Rajamangala University of Technology, Thailand; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology - Chulabhorn Research Institute - Mahidol University, 2009 |