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008			301098s1983 th r 000| 0eng d
035			_a.b10618417
099		9	_aAIT Thesis no.EV-83-17
100	0		_aPinthita Mungkarndee
245	1	0	_aSolving "sludge bulking" problem in activated sludge process
260			_aBangkok : _bAsian Institute of Technology, _c1983
300			_a66 leaves : _bill.
490	1		_aThesis ; _vno. EV-83-17
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Science
502			_aThesis (M.Sc.) - Asian Institute of Technology, 1983
520			_aSludge bulking often occurs in the completely-mixed activated sludge processes treating carbohydrate waste. Hydrogen peroxide was selected as the chemical for sludge bulking control in this study. The effect of hy- drogen peroxide was studied first in the batch study. It was evident that the optimum effective doses of hydrogen peroxide were 40 and 60 g H202/kg MLSS·d at the SVI of 150-300 mt/g and 300-450 mt/g respectively. And it was also observed that after shock loading from 0.3 to 0.5 kg BODS/kg MLSS·d in the batch system SVI increases from 180-200 to 300-450 mt/g. The second doses of hydrogen peroxide of 60 and 70 g H202/kg MLSS·d could reduce the SVI to 150 mt/g in such unit within 3 and 2 days, respectively. While the second doses of hydrogen peroxide of 40 and 50 g H202/kg MLSS·d were needed to overcome sludge bulking within 4 days. For the continuous completely-mixed system study, the organic loading of 0.4-0.5 kg BODS/kg MLSS·d was found to be optimum with no sludge bulking occurred. In this system the effective dose was found to be 60 g H202/kg MLSS·d in both units operated under different SVI values (800-1,100 mi/g and 300-50 mg/i). The frequency of hydrogen peroxide feeding and contact time exhibit the similar effect in both units. The most effective of hydro- gen peroxide feeding and appropriate contact time were found to be single dose and more than 5 hours, respectively.
650	1	0	_aWater quality management _xNepal _xPhewa Lake
700	0		_aSamorn Muttamara, _eChairperson
700	1		_aNguyen, Cong Thanh, _eCo-Advisor
700	0		_aPakit Kiravanich, _eExamination Committee
710	2		_aJapanese Government, _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. EV-83-17
907			_a.b10618417 _bmnait _cx
902			_a230608
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