Treatment of percolate from constructed wetlands by attached-growth waste stabilization pond system | |
| Author | Sukprachok Ua-kritdathikarn |
| Call Number | AIT Thesis no. EV-98-3 |
| Subject(s) | Sewage lagoons Constructed wetlands |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | This study aimed to evaluate the treatment performance of the attached-growth waste stabilization pond (AG-WSP) units in treating percolate from constructed wetlands (CW) used for septage dewatering. One control pond and tlu·ee AG-WSP units installed with different types of attached-growth media, i.e., Globeflux-G70, Manila-rope and Plastic-sheet, were constructed at the Environmental Research Station, AIT campus. The AG-WSP units were operated with continues feeding with the CW percolate at the hydraulic retention times (HRT) of 5, 10 and 20 days, corresponding to the organic loading rates (OLR) of 1,560, 780 and 390 kg.COD/ha.d, respectively. The CW percolate characteristics contained recalcitrant organic matters and other toxic compounds, which are not easily biodegradable, resulting in low BOD5/COD ratio. Based on the eight months experiment, the AG-WSP units achieved the highest removal efficiencies of SS, VSS, BOD5, COD, N and fecal coliforms when operating at the HRT of 20 days, but the AG-WSP effluent still needed to be polished further in polishing ponds in order to meet the effluent discharge standard of Thailand. With respect to cost, durability and ease of maintenance, the plastic-sheet media was observed to be the most suitable for installing as attached-growth media in the AG-WSP units. The integrated kinetic model was found to be feasible in describing the heterotrophic, nitrification and denitrification activities in the removal of COD, NH3-N and N03-N compounds. However, due to the CW percolate characteristics as previously stated, some correction factors should be applied to the model parameters to accurately predict the AGWSP treatment performance. |
| Year | 1998 |
| 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) | Takizawa, S. ;Preeda Parkpian; |
| Scholarship Donor(s) | Royal Thai Government (RTG); |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1998 |