Reuse of biosolids from constructed wetland treating septage for Sunflower plantation | |
| Author | Vu Minh Hai |
| Call Number | AIT Thesis no.EV-06-40 |
| Subject(s) | Sewage sludge--Characterization Sunflowers--Planting |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-06-40 |
| Abstract | This study was conducted to investigate the suitability of Biosolids from Constructed Wetland for treating septage for Sunflower plantation with the focus on nutrient, accumulation of heavy metals, and other pathogenic indicator in soil-plant system. Biosolids in pilot-scale Constructed wetland were determined quantity and ten samples of biosolids were sampled to determine the characteristics. Pot study and Field experiment were also conducted at Environmental Engineering Management Research Station at the Asian Institute of Technology, Pathumthani, Thailand during 15 August, 2005 to 28 February, 2006. There were four treatments for Pot study and seven treatments for Field experiment with Sunflower. Three levels of Nitrogen application rate were used 40, 80 and 120 kgN/ha for biosolids and Cow manure compost amended soil. The field experiment was design based on the Randonmized Complytely Block Design (RCBD). The results show that the quantity of biosolids in pilot-scale constructed wetland was about 21.5 tons after 7-year septage loading at a solids loading rate of 250 kg total solid (TS)/m2.year and 6-day intermittent percolate impoundment. The analyzing results of biosolids samples show that the nutrient contents in biosolids were less than sewage sludge. It was also contaminated of heavy metal (Zn, Cu, Mn, Cr, Ni, Pb and Cd) but not exceeding with the existing Guideline or Standard values for agricultural uses. Finally, the results from Field experiment with Sunflower show that the biosolids application could be decreased the pH value of field soil after apply and increased at the harvesting time. The plants were responded at different of nitrogen application rate of biosolids and cow manure compost such as plant height, yield seed, oil content... and there were some effects with soil amended biosolids and cow manure compost such as soil pH, electrical conductivity, , heavy metals, accumulation of pathogen (Fecal coliforms and helminth eggs). The seed yield and oil content could be observed with increasing the nitrogen application rate from 40-80 kgN/ha, but there was no significant differences when the nitrogen application rate increasing from 80 to 120 kgN/ha in biosolids plots. The total nitrogen, phosphorus and potassium content in dry weight of sunflower plant were in the normal ranges and higher then that compared to other researches and Sunflower plants were uptake the heavy metal in leaf, stem, flower disc, roots and seed according to the order Zinc > Manganese > Copper > Nickel > Lead > Crom > Cadmium. Sunflower plant were not affected by soil salinity, likely due to soil salinity is below the threshold level of moderately tolerant crop of 1.9-4.4 dS/m. Based on these result from the experiment, the recommended rate of nitrogen application rate was 80 kgN/ha because produced high seed yield and % oil content and can reduce the effects of heavy metal accumulation in plant and field soil. |
| Year | 2006 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-06-40 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Thammarat Koottatep |
| Examination Committee(s) | Annachhatre, Ajit P.; Preeda Parkpian |
| Scholarship Donor(s) | Ministry of Education and Training, Vietnam |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2006 |