| Author | Chanetta Phanuwan |
| Call Number | AIT Thesis no.EV-99-24 |
| Subject(s) | Constructed wetlands
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of
Science, School of Environment, Resources & Development |
| Publisher | Asian Institute of Technology |
| Abstract | This study was conducted to investigate the main parameters affecting treatment
performance of FWS CWs treating a domestic wastewater in tropical region. The
kinetics of organic removal were evaluated. Four pilot-scale FWS CW units planted
with cattails (Typha angustifolia) were set up, while a full-scale CW unit was used to
compare the results.
The effects of hydraulic retention time (HRT) on organic removal were studied
by varying the HRTs of 5, 8 and 14 days, while the OLR was maintained at 100
kgCOD/(ha·d). The COD and BOD remoyal efficiencies were 91, 96 and 98% and 95,
97 and 98% for units operating at the HRT of 5, 8 and 14 days, respectively. The firstorder plug-flow kinetic rate constants (k20) were in the range of 0. 113-0.230 d"1 and
0.151-0.281 d-1 for COD and BOD, respectively. The k values increased with
decreasing HRT.
The effects of organic loading rate (OLR) were studied by varying the OLR at
35, 84 and 137 kgCOD/(ha·d), while the HRT was maintained at 8 days. The COD and
BOD removal efficiencies were 67, 79 and 77 % and 81, 85 and 81 % for units
operating at the OLR of 35, 84 and 137 kgCOD/(ha·d), respectively. It was found that
the highest COD and BOD removal efficiencies were found in the unit operating at the
OLR of 84 kgCOD/(ha·d). The k20 values ranged 0.060-0.095 day"1 and 0.109-0.112
day"1 for COD and BOD, respectively.
Based on ANOVA test at p > 0.05, there was no significant difference between
the mean COD and BOD5 removal efficiencies at the HRT of 8 and 14 days, but the
HRT of 8 days was recommended on economic reason. The OLR at the range of 35-
137 kgCOD/(ha·d) did not appear to have significant effects on organic matter removal
efficiencies and the k values. |
| Year | 1999 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| 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) | Ozaki, Hiroaki ;Dahl-Madsen, Karl Iver; |
| Scholarship Donor(s) | Asian Institute of Technology Partial Scholarship; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1999 |