| Author | Gani, Dewan Osman |
| Call Number | AIT Thesis no. AS-98-17 |
| Subject(s) | Sewage sludge as fertilizer--Bangladesh--Dhaka
|
| 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 |
| Abstract | The present study was conducted with the view to investigate the suitability of Pagla
STP sludge as source of nitrogen and phosphorus for crop plants. Emphasis was also given to
the heavy metal uptake by the plant from the sewage sludge. To investigate these two pot
studies using sludge were carried out with sunflower as the test crop in the premise of
Regional Laboratory, Soil Resource Development Institute, Rajshahi, Bangladesh. The dry
matter production was considered as the crop yield. Four levels of nitrogen and that for
phosphorus were applied and to compare the performance of sludge, trials with mineral
fertilizers (urea and TSP) were carried out. A common control treatment with no fe1tilizer
was also carried out.
Sludge quality was not comparable in terms of it's nutrient content with that of other
nations even with Bangkok sludge since it contained low level of nitrogen and phosphorus.
However experimental results suggest that the performance of sludge was not bad. Almost
same yield of sludge treated plants (as mineral fertilizer treated plants) implies that most of
the nitrogen and phosphorus were available to the plants. Zn was the metal of most concern
since it was present in high level. No toxic symptom due to uptake of potentially toxic heavy
metals was observed which indicates that uptake of metals did not exceed the limits. Though
sludge contained very low level of Mn but the uptake for it was the highest of all metals.
There was no significant difference in all the metal content of sludge treated plants with that
of control. Only Zn uptake of sludge treated plants was significantly different from control
and other mineral treatment. Soil test results show that Zn, Mn, Cu and Cr had leached
downward to some extent. Statistically significant leaching was observed in case of Zn.
Considering all these, it could be concluded that the Pagla STP sludge can be utilized as the
fe1tilizer taking into account the total Zn input in the land over a period of time. |
| Year | 1998 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Aquatic Systems(AS) |
| Chairperson(s) | Hansen, Gunner Kjer; |
| Examination Committee(s) | Eckhardt, Ing. Heinz ;Preeda Parkpian; |
| Scholarship Donor(s) | DANIDA, Royal Danish Embassy, Dhaka;Asian Institute of Technology |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1998 |