| Author | Somwung Sintumongkolchai |
| Call Number | AIT Thesis no.EV-96-34 |
| Subject(s) | Sewage--Purification--Heavy metals removal
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of
Master of Science |
| Publisher | Asian Institute of Technology |
| Abstract | This study was conducted to evaluate the efficiency of free water surface (FWS)
constructed wetland units in the treatment of a wastewater containing with cadmium (Cd).
Three lab-scale and one pilot-scale units were set-up. Cattails (Typha spp.), an emergent plant,
were planted in these wetland units.
At the influent Cd concentration of 1-100 mg/I, there were about 42-99% Cd removal
in these constructed wetland beds, and no evidence of Cd toxicity to the cattail plants was
observed. The initial wastewater pH had some effects on Cd removal, in which the Cd
removal efficiency was reduced to about 42.26% when the initial pH was adjusted to 4-5 at the
initial Cd concentration of 100 mg/I. Based on mass balance analysis, about 73-98% of Cd
were found to be removed by adsorption to the sand media, while cattail plant uptake was
responsible for about 1-6% of Cd removal. The major Cd removal mechanism in this
experiment could be adsorption. |
| Year | 1996 |
| 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) | Kamei, Tasuku;Preeda Pakpian; |
| Scholarship Donor(s) | Queen Sirikit Scholarship; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1996 |