000			03098nas a2200409 4500
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008			011298s1986 th r 000| 0eng d
035			_a.b10185744
099		9	_aAIT Thesis no.EV-86-3
100	1		_aLim, Siok Kek
245	1	0	_aDegradation of organic matters in anaerobic sediments
260			_aBangkok : _bAsian Institute of Technology, _c1986
300			_a87 p.
490	1		_aThesis ; _vno. EV-86-3
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering
502			_aThesis (M.Eng.) - Asian Institute of Technology
520			_aThe anaerobic metabolism of organic matters which include the process of fermentation, sulfate reduction and methane production were studied by using sediments from the polluted river. Samples were collected from the lower part of the Chao Phya river. Batch experiment was adopted for the study. Different types and quantities of substrates were introduced into the sediments. Also different quantities of sediments were used in order to examine whether sediment quantities would affect reaction mechanisms. The prepared samples were incubated at 30 °c in the dark. During the incubation period, various parameters such as carbohydrate , sulfate, TOA, etc. were analysed. The results showed that sulfate re- duction was predominant than methanogenesis in the presence of sulfate when acetate was used as the substrate. However, a significant low rate of methanogenesis can be detected in all sediments although rates of sulfate reduction were much higher. On the other hand, in anaerobic freshwater sediment where sulfate concentration was very low, methanogenesis was the major terminal process. The different doses of substrates addition gave the similar patterns of reaction mechanisms while decreased the quantities of sediment used from 30 g to 5 g with 60 ml of river water showed rather slower reaction with less sediment used.
650		0	_aSedimentation and deposition
700	1		_aHanaki, Keisuke, _eChairperson
700	1		_aFude, I., _eExamination Committee
700	1		_aShin, Hang-Sik, _eExamination Committee
710	2		_aLee Foundation, Singapore, _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. EV-86-3
907			_a.b10185744 _bmnait _cx
902			_a230428
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