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- Title
MIB and 2,4-D Removal by Biofilters During Episodic Loading.
- Authors
ZEARLEY, THOMAS L.; SUMMERS, R. SCOTT
- Abstract
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 pseudofirst- 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.
- Subjects
ALGAL metabolites; HERBICIDES; DISSOLVED organic matter; BIOFILTERS; ORGANIC compounds removal (Water purification)
- Publication
Journal: American Water Works Association, 2015, Vol 107, Issue 12, pE666
- ISSN
0003-150X
- Publication type
Article
- DOI
10.5942/jawwa.2015.107.0177