Characterization of natural organic matter adsorption in granular activated carbon adsorbers
- 6 May 2011
- journal article
- Published by Elsevier BV in Water Research
- Vol. 45 (13), 3951-3959
- https://doi.org/10.1016/j.watres.2011.04.047
Abstract
The removal of natural organic matter (NOM) from lake water was studied in two pilot-scale adsorbers containing granular activated carbon (GAC) with different physical properties. To study the adsorption behavior of individual NOM fractions as a function of time and adsorber depth, NOM was fractionated by size exclusion chromatography (SEC) into biopolymers, humics, building blocks, and low molecular weight (LMW) organics, and NOM fractions were quantified by both ultraviolet and organic carbon detectors. High molecular weight biopolymers were not retained in the two adsorbers. In contrast, humic substances, building blocks and LMW organics were initially well and irreversibly removed, and their effluent concentrations increased gradually in the outlet of the adsorbers until a pseudo-steady state concentration was reached. Poor removal of biopolymers was likely a result of their comparatively large size that prevented access to the internal pore structure of the GACs. In both GAC adsorbers, adsorbability of the remaining NOM fractions, compared on the basis of partition coefficients, increased with decreasing molecular size, suggesting that increasingly larger portions of the internal GAC surface area could be accessed as the size of NOM decreased. Overall DOC uptake at pseudo-steady state differed between the two tested GACs (18.9 and 28.6 g-C/kg GAC), and the percent difference in DOC uptake closely matched the percent difference in the volume of pores with widths in the 1–50 nm range that was measured for the two fresh GACs. Despite the differences in NOM uptake capacity, individual NOM fractions were removed in similar proportions by the two GACs.Keywords
This publication has 28 references indexed in Scilit:
- Characterisation of aquatic humic and non-humic matter with size-exclusion chromatography – organic carbon detection – organic nitrogen detection (LC-OCD-OND)Water Research, 2011
- Assessing biological stability of drinking water without disinfectant residuals in a full-scale water supply systemJournal of Water Supply: Research and Technology—AQUA, 2010
- Interplay of different NOM fouling mechanisms during ultrafiltration for drinking water productionWater Research, 2007
- Rapid and direct estimation of active biomass on granular activated carbon through adenosine tri-phosphate (ATP) determinationWater Research, 2007
- Efficiency of the activated carbon filtration in the natural organic matter removalEnvironment International, 2005
- Trihalomethane formation potential of dissolved organic matter in a shallow eutrophic lakeWater Research, 2003
- Pesticide Adsorption by Granular Activated Carbon Adsorbers. 2. Effects of Pesticide and Natural Organic Matter Characteristics on Pesticide Breakthrough CurvesEnvironmental Science & Technology, 2002
- Role of Granular Activated Carbon Surface Chemistry on the Adsorption of Organic Compounds. 1. Priority PollutantsEnvironmental Science & Technology, 1999
- The evaluation of drinking water treatment performed with HPSECEnvironment International, 1998
- A distribution model for binding of protons and metal ions by humic substancesEnvironmental Science & Technology, 1983