Kinetic evaluation of constructed wetlands for treatment of domestic wastewater | |
| Author | Supatpong Mattaraj |
| Call Number | AIT Thesis no. EV-95-37 |
| Subject(s) | Sewage--Purification--Biological treatment Wetlands |
| Note | A thesis submitted m partial fulfillment of the requirements for the degree of Master of Engineering. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-95-37 |
| Abstract | This study was conducted to evaluate the performance and kinetic characteristics of free water surface (FWS) constructed wetland system for treatment of a domestic wastewater in tropical areas. Five laboratory-scale and two pilot-scale FWS constructed wetland units were setup while a full-scale constructed wetland unit was used to validate with kinetic coefficients obtained from the laboratory-scale and pilot-scale experiments. Cattails (Typha spp. ), an emergent plant, were planted on these wetland beds. The experimental results revealed that the organic loading rate (OLR) of 50 - 200 kg COD/(ha.day) and the HRT of 1.5 - 10 days resulted in the COD removal of 71 - 86 %, while the removal efficiencies of BOD5, fecal coliforms and bacteriophages were more than 90 %. The removal of SS and TKN were in the range of 81 - 87 %, and the total-P removal was 38 %. The dispersion number (d) was calculated in the range of 0.1 to 0.2, indicating a dispersed-flow condition. Based on the kinetic studies, the plug-flow kinetic coefficient (K2orr) was found to be 0.247 da/, while the dispersed-flow kinetic coefficient (K20df) was 0.302 dai'. The plug-flow kinetic coefficient value was found satisfactory in validating the data of the full-scale constructed wetland unit. The cattail plants could remove about 1340 kg N/ha and 140 kg P/ha in five months of operation period. |
| Year | 1995 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-95-37 |
| 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) | Samorn Muttamara;Visvanathan, C. |
| Scholarship Donor(s) | Asian Institute of Technology-Queen Sirikit Environment;Development Followship Program |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1995 |