000			03826nas|a2200397 i 4500
005			20260818100205.0
008			190499s1998 th uzm rtt 00| a1eng d
035			_a.b11746932
099		9	_aAIT Thesis no. AS-98-17
100	1		_aGani, Dewan Osman
245	1	0	_aEnvironmental and plant nutritional assessment of sewage sludge of Dhaka, Bangladesh
260			_aBangkok : _bAsian Institute of Technology, _c1998
300			_a88 leaves
490	1		_aThesis ; _vno. AS-98-17
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development
502			_aThesis (M.Sc.) - Asian Institute of Technology, 1998
520			_aThe 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.
650		0	_aSewage sludge as fertilizer _zBangladesh _zDhaka
700	1		_aHansen, Gunner Kjer, _eChairperson
700	1		_aEckhardt, Ing. Heinz, _eExamination committee
700	0		_aPreeda Pakpian, _eExamination Committee
710	2		_aDANIDA, Royal Danish Embassy, Dhaka, _eScholarship donor
710	2		_aAsian Institute of Technology, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. AS-98-17
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B13212
907			_a.b11746932 _bmnait _cy
902			_a240411
998			_b0 _c990419 _dm _ea _fy _g0
945			_lmnait
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942			_c40
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