000			04268nas|a2200421 i 4500
005			20260818144929.0
008			040430s2003 th u m rtt 00| a1eng d
035			_a.b11923933
099		9	_aAIT Thesis no.EV-03-7
100	1		_aJunaid, Juhaina Binth
245	1	0	_aKinetics of lead and arsenic in activated carbon fiber
260			_aPathum Thani, Thailand : _bAsian Institute of Technology, _c2003
300			_a108 p.: _bill.
490	1		_aThesis ; _vno. EV-03-7
502			_aThesis (M.Sc.) - Asian Institute of Technology, 2003
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Masters of Science.
520			_aThis study was conducted to investigate the kinetics of Pb and As in an ACF system. An artificial suspension of Pb and As was used as the influent for the laboratory scale experiment. For each session of experiment one of the three parameters: initial concentration (C0), flowrate (Q) and operation time (t), were varied while the other two were kept constant. Average removal efficiency of Pb and As was found to be 100 and 13 percent respectively for initial concentrations below or equal to 10 ppm. Using arsenic contaminated groundwater samples ACF showed an average of 24.6 percent removal efficiency when two filters were used in series. At a flowrate of 40 mL/min and initial concentration of approximately 10 ppm, the breakthrough point for Pb was reached in approximately 4.25 hr. However for As the point was reached at 5 hr. Adsorption capacity of Pb in ACF is 0.5 mg/mg of ACF, whereas, for As it is only 0.18 mg/mg of ACF. The study concludes that performance of ACF for the removal of Pb and As is highly sensitive to changes in operational parameters C0 , t and Q. Correlation data shows final concentration of Pb (in ppm) increases with increase in C0(ppm), t (hr) and X (mg) (total amount of adsorbate removed) by factors of 0.66, 0.62 and 0.48 respectively. Final concentration of As (in ppm) increases with increase in C0 (ppm), t (hr) and X (mg) by factors of 0.95, 0.80 and 0.42 respectively. Removal efficiency of ACF decreases by the factor of 0.53 with increment of operation time by one hour for both Pb and As. Raw data shows increase in removal efficiency of As with increase in Q, and decrease in removal efficiency of Pb with increase in Q in ACF. Different models were proposed to explain the variation of final concentration of Pb or As with the variation of the above mentioned parameters. The types of models generated were linear regression models, non-linear two-dimensional models and non-linear threedimensional models. Most of the linear models gave above 60% fit of the experimental data, whereas non-linear models gave above 90% fit. Non-linear models best described the relationships of C with C0 and t. The developed three-dimensional models described the kinetics of Pb and As with high accuracy (Rsquare was 0.9010 and 0.9812 respectively). The study concludes that, although the ACF filter may be highly efficient for the removal of Pb from drinking water, it may not be practical to use it as a stand-alone system for the purification or As contaminated groundwater.
650		0	_aLead
650		0	_aCarbon, Activated
650		0	_aCarbon fibers
700	1		_aLee, Seung Hwan, _eChairperson
700	1		_aKwak, Il-Chyun, _eExamination committee
700	1		_aSatoh, Hiroyasu, _eExamination Committee
700	0		_aThamarat Koottatep, _eExamination committee
710	2		_aDanish International Development Assistance, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. EV-03-7
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B08208
907			_a.b11923933 _bmnait _cu
902			_a240417
998			_b0 _c040430 _dm _ea _fu _g0
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945			_lmnarc
942			_c22
942			_c40
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