Cross-Section, no. 112, February 1962.: no. 112 (February ...
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Two-Stage Batch Adsorber Design Using Pseudo-Secon d-Order Kinetic Model for the Adsorption of Acid B lue 25 Dye onto Peat Pei-Yu Lin 1# , Ming-Huang Wang 1 , Yu-Ting Feng 1 , I-Hsin Lin 1 and Yuh-Shan Ho 2 * 1 School of Public Health, Taipei Medical University 2 Bibliometric Centre, Taipei Medical University - Wan-Fang Hospital Introduction Introduction Batch adsorber design has mainly concentrated on reducing adsorbent costs, which is particularly relevan t when expensive sorbent materials such as active carbon, silica, zeolites and resins are used. But for cheaper adsorbents minimizing the contact time for a fixed percentage of pollution removal using a fixed mass of adsorbent will result in being able to process more batches of polluted wastewater per day, thus enabling the required treatment plant items to be reduced in size, with a decrease in the plant capital cost. This paper studies the adsorption of Acid Blue 25 dye onto peat and develops a two-stage batch ads orber design model. Methods A 0.5 g sample of peat (500-710 m) was added to each 50 ml volume of Acid Blue 25 (AB25) dye solution. The initial concentrations of AB25 dye solution tested were 20, 50, 100 and 200 mg/dm 3 . Samples were wit hdrawn at suitable time intervals, filtered through a filter paper and then analysed AB25 concentration using UV. Figure 1: Comparison of 80% AB25 removal time of each stage in two-stage AB25/peat process 0 50 100 150 200 250 300 350 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Adsorption system num ber Tim e (m in) 80% R em oval Stage 1 Stage 2 Figure 2. Minimum contact time for various percentage AB25 removal in a two- stage AB25/peat process 0 50 100 150 200 250 300 350 400 450 0 2 4 6 8 10 12 14 16 18 20 22 24 Adsorption system num ber Tim e (m in) 89% R em oval 86% R em oval 83% R em oval 80% R em oval Results e e t q t kq t q 2 1 t q kq q t e e t 1 1 2 0 1 0 q q S C C L n n t kq L t Skq C C n n n n 1 2 1 n n n n n n n t kq kq LC St R 1 2 0 1 1 100 Pseudo-second-order kinetic model Mass balance equation Table 1. Parameters for effect of initial concentration on the AB25/peat system C 0 mg/dm 3 q e mg/g k g/m g m in h m g/g m in r 2 20 1.85 0.0442 0.152 0.999 50 4.40 0.0110 0.213 0.999 100 7.76 0.00156 0.0941 0.994 200 12.7 0.000747 0.121 0.924 839 . 0 0 157 . 0 C q e 86 . 1 0 3 . 12 C k t C C LC t C C S C C C R n n n 839 . 0 0 86 . 1 0 0 2 839 . 0 0 86 . 1 0 0 1 157 . 0 3 . 12 1 157 . 0 3 . 12 100 100 n n n n n t C C C C LC St R 1 839 . 0 0 86 . 1 0 2 839 . 0 0 86 . 1 0 0 1 157 . 0 3 . 12 1 157 . 0 3 . 12 100 Conclusions Conclusions The design model presented is based on a p seudo-second-order kinetic model, and this has been used for minimizing the reaction time used in a two-stage contact system th at operating cost would be reduced. The method proposed in this study enables the contact time in a two-stage batch adso rber to be minimized to achieve a fixed pe rcentage of Acid Blue 25 removal using a f ixed mass peat. An optimised operating condition, the mini mum contact time is 191 min, with reaction times of 100 min for stage 1 and 91 min fo r stage 2.
description
adsorption
Transcript of 112
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Two-Stage Batch Adsorber Design Using Pseudo-Second-Order Kinetic Model for the Adsorption of Acid Blue 25 Dye onto PeatPei-Yu Lin1#, Ming-Huang Wang1, Yu-Ting Feng1, I-Hsin Lin1 and Yuh-Shan Ho2*1School of Public Health, Taipei Medical University2Bibliometric Centre, Taipei Medical University - Wan-Fang HospitalIntroductionBatch adsorber design has mainly concentrated on reducing adsorbent costs, which is particularly relevant when expensive sorbent materials such as active carbon, silica, zeolites and resins are used. But for cheaper adsorbents minimizing the contact time for a fixed percentage of pollution removal using a fixed mass of adsorbent will result in being able to process more batches of polluted wastewater per day, thus enabling the required treatment plant items to be reduced in size, with a decrease in the plant capital cost. This paper studies the adsorption of Acid Blue 25 dye onto peat and develops a two-stage batch adsorber design model.MethodsA 0.5 g sample of peat (500-710 m) was added to each 50 ml volume of Acid Blue 25 (AB25) dye solution. The initial concentrations of AB25 dye solution tested were 20, 50, 100 and 200 mg/dm3. Samples were withdrawn at suitable time intervals, filtered through a filter paper and then analysed AB25 concentration using UV.Results
Pseudo-second-order kinetic modelMass balance equationConclusionsThe design model presented is based on a pseudo-second-order kinetic model, and this has been used for minimizing the reaction time used in a two-stage contact system that operating cost would be reduced.The method proposed in this study enables the contact time in a two-stage batch adsorber to be minimized to achieve a fixed percentage of Acid Blue 25 removal using a fixed mass peat.An optimised operating condition, the minimum contact time is 191 min, with reaction times of 100 min for stage 1 and 91 min for stage 2.
