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005			20260818144931.0
008			040430s2003 th u m rtt 00| a1eng d
035			_a.b11923994
099		9	_aAIT Thesis no. EV-03-13
100	1		_aShrestha, Minita
245	1	0	_aKinetics of the anaerobic sulfate reduction process
260			_aPathum Thani, Thailand : _bAsian Institute of Technology, _c2003
300			_a85 leaves : _bill.
490	1		_aThesis ; _vno. EV-03-13
502			_aThesis (M.Sc.) - Asian Institute of Technology, 2003
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Science.
520			_aApproaches to mathematical modelling of anaerobic digestion and criteria for reactor design in anaerobic wastewater treatment are based on biological degradation kinetics. Whatever type of kinetics is used, the crucial problem always is reliable parameter estimation. Laboratory scales continuous stirred tank reactors (CSTR) were used to determine the kinetic parameters for methanogens and sulfidogens and to study the simultaneous sulfidogenesis and methanogenesis at different COD: So/- ratios. Kinetic parameters determined for each of these groups were bacterial yield, decay coefficient, maximum specific substrate utilization coefficient, and half-velocity constant and maximum specific growth rate. Results indicated that there are not many differences between estimated kinetic values for SRB and MB. It was found from the experiment that MB has very slightly higher Ks value than SRB which showed that MB outcompeted the SRB under nontoxic conditions in CSTR. In CSTR, sulfate removal of about 65% was achieved at COD: So/- ratio of 5:1. It was found from the study that SRB and MB had intense competition at COD: SO/- ratio of 5:1 for organic substrate. Further reduction in COD: SO/- ratio to 0.7:1, led to 100 % electron flow by SRB in the process. SRB and MB were inhibited by sulfide generation at 188mg L-1 and 80mg L-1 concentration respectively. On studying the effect of BESA on activity of methanogens it was found that lower pH (6.7-6.8) and BESA addition together has great influence on inhibition of methanogens without any effect to sulfidogens.
650		0	_aSulphates
650		0	_aAnaerobic bacteria
700	1		_aAnnachhatre, Ajit P., _eChairperson
700	0		_aPreeda Pakpian, _eExamination Committee
700	1		_aSatoh, Hiroyasu, _eExamination Committee
710	2		_aGovernment of Denmark (DANIDA), _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. EV-03-13
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B08223
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902			_a240417
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