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Removal of Mn2+ from water by “aged” biofilter media: The role of catalytic oxides layers

Paper ID Volume ID Publish Year Pages File Format Full-Text
21422 43221 2009 7 PDF Available
Title
Removal of Mn2+ from water by “aged” biofilter media: The role of catalytic oxides layers
Abstract

The present work was aimed at evaluating the surface coatings characteristics and autocatalytic manganese oxidation potentials of two groups of “aged” biofilter media. This refers to the anthracite filter media of a biological water treatment plant on which metal oxides and a biofilm have deposited on the surface of the filter media over long time of filtration. Duplicate samples of anthracite filter media were collected from each of the six filter wells in the plant and classified into two groups, based on their duration of operation, as 3-years filter media and 15-years filter media. Batch experiments showed that the 15-years filter media exhibited very high manganese sorption capacity and were less dependent on the microbial activity than the 3-years filter media. Results of the surface coatings analyses indicated that the biofilter materials is predominantly composed of variable layers of manganese and iron oxides, with microbial biomass contributing only about 3.5 and 1.4% of the dry weight of the surface coatings on the 3- and 15-years filter media respectively. Investigations onto the Mn2+ sorption by the lyophilized biofilter media showed that, the sorption kinetics on the catalytic oxides layers followed the pseudo-second-order kinetics model, thus suggesting chemisorption as the dominant mechanism of Mn2+ removal. This implied that manganese removal by these biofilters is mainly by adsorption of Mn2+ onto the iron and manganese (catalytic) oxides layers and autocatalytic oxidation. The present study has clearly linked Mn2+ oxidation to the catalytic oxides layers on the aged biofilter media.

Keywords
Biofilter media; Biological Mn oxidation; Surface coatings; Catalytic oxides layer; Autocatalysis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Bioscience and Bioengineering - Volume 107, Issue 2, February 2009, Pages 151–157
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us