We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Stratification of Granular Activated Carbon Filters for Advanced Wastewater Treatment.
- Authors
Ruhl, Aki; Zietzschmann, Frederik; Altmann, Johannes; Meinel, Felix; Sperlich, Alexander; Jekel, Martin
- Abstract
Advanced wastewater treatment with granular activated carbon (GAC) is a promising option to reduce emissions of organic micropollutants (OMP) into the aquatic environment. Frequent back-washes of the GAC filters are required due to high particle concentration in the treated wastewater but lead to stratification. Differences in adsorption capacities of individual strata are not known. The present study aimed at investigating physical and chemical differences at different filter depths of a stratified GAC filter. Two different commercial products were stratified during repeated filter bed expansions and sectioned into vertical fractions. Bulk densities, grain size distributions and ash contents of the individual fractions differed significantly. Adsorption tests with pulverized GAC from different levels showed great vertical differences in adsorption properties. OMP removals determined in the upper part of a GAC filter therefore cannot be extrapolated downwards. Both physical and chemical vertical heterogeneities with regard to adsorption capacities and residence times at different filter depths should be considered in the filter design, in the monitoring of a GAC filter, and in the interpretation of the GAC filter performance. Good correlations between abatements of UV light absorption and OMP removals were found for the virgin GAC throughout the non-uniform filter.
- Subjects
WASTEWATER treatment; CARBON; SEWAGE purification; LIGHT elements; SPECTRUM analysis
- Publication
Water, Air & Soil Pollution, 2015, Vol 226, Issue 11, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-015-2655-4