Bioadsorber efficiency, design, and performance forecasting for alachlor removal

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Please use this identifier to cite or link to this item: http://140.128.103.80:8080/handle/310901/22532

Title:	Bioadsorber efficiency, design, and performance forecasting for alachlor removal
Authors:	Badriyha, B.N.ab, Ravindran, V.a, Den, W.a, Pirbazari, M.a
Contributors:	Department of Environmental Science and Engineering, Tunghai University
Keywords:	Alachlor;Bioactive adsorber;Biofilm degradation;Chlorinated pesticides;Drinking water;Expanded bed;Fluidized bed;Predictive model
Date:	2003
Issue Date:	2013-05-21T09:09:09Z (UTC)
Abstract:	This study discusses a mathematical modeling and design protocol for bioactive granular activated carbon (GAC) adsorbers employed for purification of drinking water contaminated by chlorinated pesticides, exemplified by alachlor. A thin biofilm model is discussed that incorporates the following phenomenological aspects: film transfer from the bulk fluid to the adsorbent particles, diffusion through the biofilm immobilized on adsorbent surface, adsorption of the contaminant into the adsorbent particle. The modeling approach involved independent laboratory-scale experiments to determine the model input parameters. These experiments included adsorption isotherm studies, adsorption rate studies, and biokinetic studies. Bioactive expanded-bed adsorber experiments were conducted to obtain realistic experimental data for determining the ability of the model for predicting adsorber dynamics under different operating conditions. The model equations were solved using a computationally efficient hybrid numerical technique combining orthogonal collocation and finite difference methods. The model provided accurate predictions of adsorber dynamics for bioactive and non-bioactive scenarios. Sensitivity analyses demonstrated the significance of various model parameters, and focussed on enhancement in certain key parameters to improve the overall process efficiency. Scale-up simulation studies for bioactive and non-bioactive adsorbers provided comparisons between their performances, and illustrated the advantages of bioregeneration for enhancing their effective service life spans. Isolation of microbial species revealed that fungal strains were more efficient than bacterial strains in metabolizing alachlor. Microbial degradation pathways for alachlor were proposed and confirmed by the detection of biotransformation metabolites and byproducts using gas chromatography/mass spectrometry. ? 2003 Elsevier Ltd. All rights reserved.
Relation:	Water Research Volume 37, Issue 17, October 2003, Pages 4051-4072
Appears in Collections:	[環境科學與工程學系所] 期刊論文

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