| Author | Sukon Hadsoi |
| Call Number | AIT Thesis no.EV-05-26 |
| Note | A thesis submitted in partial fulfillment of the requirements for the
degree of Master of Science |
| Publisher | Asian Institute of Technology |
| Abstract | The prime objective of this research is to investigate the suitability of percolate from constructed wetland (CW) treating septage in agricultural application with the specific focus on determination of appropriate application ratio of percolate on sunflower plantation and crop yields. The experimental data of 3 crops plantation reviewed the plant available and total heavy metal concentrations were higher in plots with higher application ratio of percolate. The concentrations of heavy metals decreased with time. Zn and Mn concentration were detected in sunflower seed, with the maximum concentration of 121 mg/kg dry matter and 22 mg/kg dry matter, respective. These metals are not significant from daily intake point of view. Higher concentrations of Zn and Mn were detected in sunflower leaves. The maximum concentrations were found at 100% percolate plot at the concentration of 142 and 94 mg/kg dry matter, respectively, but still within the tolerable limits for agricultural crop. Considering the yields of sunflower seed and oil content, it was found that the yields of sunflower and oil content from the 20-50% percolate plots were significant higher than those of the plots applied with 100% percolate and control plots. This could be because of the excess of nitrogen in irrigation water and in soil salinity resulting in the decrease seed yield and oil content in sunflower seed. The soil salinity of sunflower field is still below the threshold limit of sunflower plant. The appropriate application ratio of percolate from CW treating septage could exhibit positive responses of the plant growth which increase seed yield and oil content. The effects of percolate application were statistically not significant with respect to heavy metals in plant tissues. Therefore, the reuse of percolate from CW treating septage consider as safe and beneficial to agricultural application. |
| Year | 2005 |
| 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) | Thammarat Koottatep; |
| Examination Committee(s) | Annachhatre, Ajit P.;Preeda Parkpian ; |
| Scholarship Donor(s) | Royal Thai Government Fellowship;NCCR-IP3 Fellowship ; |
| Degree | Thesis (M. Sc.) -- Asian Institute of Technology, 2005
|