000			04258cas|a2200397 i 4500
005			20260818180018.0
008			230399s1994 th uzm rtt 00| a1eng d
035			_a.b10557131
099		9	_aAIT Thesis no. EV-94-05
100	1		_aBiswadeep, Basu
245	1	0	_aRemoval of volatile organic compounds by air perstripping
260			_aBangkok : _bAsian Institute of Technology, _c1994
300			_a142 leaves
490	1		_aThesis ; _vno. EV-94-05
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources & Development
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1994
520			_aThis work is a continuity of the ongoing study of sweeping air pervaporation or air perstripping for the treatment of VOCs found in numerous industrial wastewater. A thorough literature survey on different models, influencing parameters, membranes, modules and module geometries was performed in order to investigate the results of the experiments in the light of the latest concepts. In order to study the behavior of pervaporation and its underlying kinetics, laboratory scale experiments were performed, with dense silicone-polyethersulfone, commercial composite capillary membranes. Basically optimization of flux with respect to the air flow rate, responses to different initial feed concentration of VOCs, performance of different flow modes ( cocurrent and cross flow) and the effect of presence of an additional interfering compound (1, 1, 1 trichloroethane) on the flux of a targeted volatile organic compound (trichloroethylene) were the focus of the study. Optimization of flux with respect to air flow rate could be clearly identified and the effect of excess air flow on flux production was found to have either no impact or negative impact, depending upon the flow mode chosen. Out of the parameters that vitally influence flux production, initial feed concentration was found to be one of predominant one and it was found that the membrane strains to handle low feed concentration of the VOCs. Water flux was found to be heavily influenced by organic flux and decreased with the increase of the organic flux. Cross flow mode was found to be better than the cocurrent flow mode in almost all respects. However the difference was marked in case of low concentration of organic compounds which is the usual case with actual wastewater. Also at higher air flow rates the performance of the cross flow mode improved unlike cocurrent flow mode. The effect of the addition of another organic compound of almost same nature, was found to be positive and flux of both the compounds improved due to the better swelling of the membrane. Prediction of flux by Solution-Diffusion model was reasonably good, while Resistance-in-Series model showed that for VOCs, resistance at the liquid-membrane interface was the rate limiting step. Models for binary compounds failed to predict flux upto expectations and indicated that modifications are required. Lastly perstripping combined with the state-of-art post treatment technologies has been proposed to complete the treatment train of VOCs.
650		0	_aPervaporation
700	1		_aVisvanathan, C., _eChairperson
700	1		_aMora, Jean-Claude, _eExamination Committee
700	0		_aChongrak Polprasert, _eExamination Committee
700	1		_aReutergardh, Lars, _eExamination Committee
710	2		_aSwedish International Development Authority (SIDA), _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. EV-94-05
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B15603
907			_a.b10557131 _bmnait _cx
902			_a240409
998			_b2 _c951012 _dm _ea _fx _g0
945			_lmnait
945			_lmnarc
942			_c22
942			_c40
909			_aBarcode : a _bCREATED : 1995-10-15 _cRECORD # : i10701862 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
909			_aBarcode : 30050160055553 _bCREATED : 2016-11-05 _cRECORD # : i12975333 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
999			_c99501 _d99501