MIB and 2,4-D Removal by Biofilters During Episodic Loading

Episodic occurrences of trace organic contaminants may affect their removal by biofilters. Removal of the naturally occurring algal metabolite 2-methylisoborneol (MIB) and the herbicide 2,4-dichlorphenoxyacetic acid (2,4-D) by seven biofilters with an average empty bed contact time (EBCT) of 8.7 min...

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Bibliographic Details
Published in:Journal - American Water Works Association 2015-12, Vol.107 (12), p.E666-E673
Main Authors: Zearley, Thomas L., Summers, R. Scott
Format: Article
Language:English
Subjects:
acclimation
Algae
Biofilters
Biofiltration
Biological Filtration
Dissolved organic matter
herbicide
Metabolites
Microorganisms
Nutrient removal
Odor
Organic contaminants
Taste
taste and odor
trace organic contaminants
Water treatment
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Summary:Episodic occurrences of trace organic contaminants may affect their removal by biofilters. Removal of the naturally occurring algal metabolite 2-methylisoborneol (MIB) and the herbicide 2,4-dichlorphenoxyacetic acid (2,4-D) by seven biofilters with an average empty bed contact time (EBCT) of 8.7 min is presented under a range of intermittent exposure conditions with continuous presence of dissolved organic matter. An average 70% removal of both MIB and 2,4-D was found under constant exposure conditions over seven months. With the use of a pseudo-first-order model, much of the variability in removal during this time could be explained by EBCT changes. Microorganisms in the biofilters retained the capacity to biodegrade MIB and 2,4-D after non-exposure periods of up to five months. However, after nine months of non-exposure, the MIB and 2,4-D removals were lower than with the control biofilter, although the biofilter began to quickly reacclimate to these contaminants.
ISSN:0003-150X
1551-8833
DOI:10.5942/jawwa.2015.107.0177