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Haya H Al Muhannadi
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Multiscale estimation of the Freundlich adsorption isotherm

Author(s): Nounou, MN (Nounou, M. N.); Nounou, HN (Nounou, H. N.)

Adsorption plays an important role in water and wastewater treatment. The analysis and design of processes that involve adsorption rely on the availability of isotherms that describe these adsorption processes. Adsorption isotherms are usually estimated empirically from measurements of the adsorption process variables. Unfortunately, these measurements are usually contaminated with errors that degrade the accuracy of estimated isotherms. Therefore, these errors need to be filtered for improved isotherm estimation accuracy. Multiscale wavelet based filtering has been shown to be a powerful filtering tool. In this work, multiscale filtering is utilized to improve the estimation accuracy of the Freundlich adsorption isotherm in the presence of measurement noise in the data by developing a multiscale algorithm for the estimation of Freundlich isotherm parameters. The idea behind the algorithm is to use multiscale filtering to filter the data at different scales, use the filtered data from all scales to construct multiple isotherms and then select among all scales the isotherm that best represents the data based on a cross validation mean squares error criterion. The developed multiscale isotherm estimation algorithm is shown to outperform the conventional time-domain estimation method through a simulated example.

Author(s):  Nounou, MN (Nounou, M. N.); Nounou, HN (Nounou, H. N.)
Source:  INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY, 7 (3): 509-518 SUM 2010
Language:  English
Document Type:  Article
Author Keywords:  Freundlich isotherm; Multiscale representation; Noise filtering; Parameter estimation
KeyWords Plus:  SYSTEM-IDENTIFICATION; WAVELET SHRINKAGE; ACTIVATED CARBON; PARSIMONY; KINETICS; REMOVAL; MODELS; IONS
Addresses:  [Nounou, M. N.; Nounou, H. N.] Texas A&M Univ Qatar, Elect & Comp Engn Program, Chem Engn Program, Doha, Qatar
Reprint Address:  Nounou, MN, Texas A&M Univ Qatar, Elect & Comp Engn Program, Chem Engn Program, Doha, Qatar.
Funding Agency:  Qatar National Research Fund (QNRF)
Publisher:  CTR ENVIRONMENT & ENERGY RESEARCH & STUDIES
Publisher Address:  IAU, GRADUATE SCH ENVIRONMENT & ENERGY, SCIENCE & RESEARCH CAMPUS, PO BOX 14515-775, TEHRAN, 00000, IRAN
ISSN:  1735-1472
29-char Source Abbrev.:  INT J ENVIRON SCI TECHNOL
ISO Source Abbrev.:  Int. J. Environ. Sci. Technol.
Subject Category:  Environmental Sciences
ISI Document Delivery No.:  609ZM
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