000			03403cas|a2200385 i 4500
005			20260818095300.0
008			230399s1993 th uzm rtt 00| a1eng d
035			_a.b10230968
099		9	_aAIT Thesis no.EV-93-35
100	1		_aLee, Young Ho
245	1	0	_aEffects of molybdate addition on the anaerobic treatment of sulfate-rich wastewater
260			_aBangkok : _bAsian Institute of Technology, _c1993
300			_a108 leaves + _e1 online resource
490	1		_aThesis ; _vno. EV-93-35
500			_aA thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1993
520			_aThe anaerobic treatment of amino acid wastewater with the addition of molybdate was studied using upflow anaerobic filter reactors. The batch test was conducted to obtain the optimum concentration of molybdate for application to the anaerobic filter reactor. Higher methane production and complete inhibition of sulfate reduction were observed at 3 mM molybdate. Four laboratory scale upflow anaerobic filter with the total volume of 16.81 was used. The amino acid wastewater which contained Sg COD/l and 3g sulfate/I was used as the substrate. In the initial stage of phase I, no molybdate was added to the reactors for the period of 61 days. Then the reactors were fed with 4 different concentration of molybdate (l, 3, 5 and 10 mM). The complete inhibition of sulfate reduction was observed when the molybdate concentration was 3, 5 and 10 mM. Increasing methane production was observed only when the molybdate concentration was 3mM. But when the molybdate concentration was 5 or 10 mM, both methanogenesis and sulfate reducing bacteria were inhibited. The recovery of methane production was difficult after methanogenesis inhibition. In phase II, molybdate(3mM) was added at the time of start-up of the reactor to discourage the growth and development of sulfate reducing communities. Methane production of the continuous addition of molybdate(3mM) was better than that of the intermittent addition of 3mM (at a two day interval). Methane production was improved 5.3 times more than that of the control with the inhibition of sulfate reduction (72.7%). COD removal was not largely affected with or without the addition of molybdate in organic loading rates of 2.4 and 1.2 kg COD/m3.day with upflow anaerobic filter reactors.
650		0	_aSewage _xPurification _xBiological treatment
700	1		_aTanaka, Shuzo, _eChairperson
700	1		_aLee, Seong-Key, _eExamination committee
700	0		_aSamorn Muttamara, _eExamination Committee
710	2		_aGovernment of Korea, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. EV-93-35
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B16685
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