| Author | Kunnika Changwichan |
| Call Number | AIT Thesis no.EV-07-21 |
| Subject(s) | Constructed wetlands
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Environmental Engineering and Management Inter-University Program on Environmental Toxicology, Technology and Management. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-07-21 |
| Abstract | Bisphenol A (BPA), a suspected endocrine disrupting chemical is being used widely lbr the production of polycarbonate plastics and epoxy resins. This study was conducted to investigate the feasibility of employing constructed wetlands (CW), a natural system, to treat wastewaters containing BPA. Two pilot scale CW units, planted with cattail (Tipha spp.), were operated under ambient conditions (temperature about 25-35°C) at the hydraulic retention times (HRT) of 10 and 15 clays. At the influent BPA concentration of 20 mg/L, the CW units could remove about 80% of BPA without toxicity effects on cattail plants and there was no statistical difference in the effect of HRTs at 10 and 15 days on CW performance. Based on fluorescence in situ hybridization (FISH) analysis, the densities of most bacteria and Pseudoinonas spp. (using EUB 338 and PSM G probes repectively) were found to be 68-73% and 6-9% respectively. These results confirmed the growth of Pseudonronas spp. bacteria responsible for BPA degradation in the CW beds. Mass balance analysis revealed the BPA degradation in the CW bed to be 30-40%, uptake by cattail plants about 1% and adsorption on the CW media 45-60%. Under these operating conditions, the effluent pH and DO concentrations of the CW effluents were in the ranges of 6-7 and 2.5-3.0 mg/L. At present, there is no effluent standard for BPA concentration in Thailand and internationally. However, due to potential endocrine disrupting effects that BPA can cause to human and animal, the application of CW to blode- radation of BPA in industrial and municipal wastewaters is strongly recommended. |
| Year | 2007 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-07-21 |
| 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) | Chongrak Polprasert; |
| Examination Committee(s) | Jutamaad Satayavivad;Shipin, Oleg; |
| Scholarship Donor(s) | RTG Fellowship; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology - Chulabhorn Research Institute - Mahidol University, 2007 |