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035			_a.b11687101
099		9	_aAIT Thesis no. EV-97-38
100	0		_aSermsook Pakkattang
245	1	0	_aNutrition value and pathogen aspects of Bangkok domestic sludges and potential for agriculture use
260			_aBangkok : _bAsian Institute of Technology, _c1997
300			_a96 leaves
490	1		_aThesis ; _vno. EV-97-38
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, 1997
520			_aThe application of Bangkok nightsoil and sewage sludge to agricultural land was investigated considering the nutrition value and pathogen problems. Analysis of two sewage and one nightsoil sludge, a pot study and a field study using sunflowers and grass have been conducted. The investigations showed the suitability of this sludges for reuse in agriculture. A good sludge treatment e.g. anaerobic digestion has a good influence on the sludge characteristics, such as lower numbers in fecal coliforms and no presence of parasites together with high nitrogen content ( ~ 4% N). The application of two sludges to a field study with sunflowers showed linearly relations between nitrogen application and grain yield. The application of 120 kg N/ha with sewage sludge from Huay Kwang showed the highest yield. This results are comparable to the 80 Kg N/ha application with chemical fertilizer. Nitrogen applied by sludge is not immediately available because of the required mineralization in the soil whereas available phosphorus and exchangeable potassium in the soil were raised, which proved to have certain benefitial effects on crop yield. In terms of pathogens the sludge amended soils have to be left more than three months after sludge application to reduce the fecal coliforms until less than 2 MPN per 2 gram wet weight (the lowest detectable number). The field study with grass showed a linearly relation between nitrogen application and fresh biomass yield. The liquid sludge application seemed to be most suitable. Considering aesthetic aspects the grass fields have to be left 110 days to receive a fecal coliforms free soil.
650	1	0	_aSewage sludge as fertilizer
700	1		_aEckhardt, Ing. Heinz, _eChairperson
700	1		_aIshibashi, Yoshinobu, _eExamination committee
700	1		_aTinsley, Richard L., _eExamination committee
700	0		_aPreeda Pakpian, _eExamination Committee
710	2		_aRoyal Thai Government, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. EV-97-38
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B13992
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