(86b) Adsorption Kinetics of N-Nitrosodimethylamine (NDMA) Onto Activated Carbons
- Conference: AIChE Spring Meeting and Global Congress on Process Safety
- Year: 2021
- Proceeding: 2021 AIChE Virtual Spring Meeting and 17th Global Congress on Process Safety
- Group: Environmental Division
- Time: Wednesday, April 21, 2021 - 11:20am-11:40am
The purpose of this research was to test the ability of biochars made from local biomass wastes to adsorb NDMA from water at treatment-relevant concentrations. The adsorption kinetics of biochars produced from pecan shells and local forestry residues were tested and compared with a commercially available coconut shell-derived activated carbon. Further testing of the commercially available carbon was conducted in a lab-scale column for adsorption of NDMA to be used as a basis for future work.
Calgon coconut shell carbon (CSC) provided the fastest and highest capacity for NDMA adsorption; synthesized pine bark char adsorbed more NDMA by the end of the kinetics study than the commercial pecan shell char; and synthesized pecan shell char was the worst performing char. Intraparticle diffusion was negligible for CSC but controlled a noticeable segment of adsorption for the other carbons. Column breakthrough trends did not follow expected patterns: breakthrough occurred much more rapidly than models indicated, and faster flowrates resulted in slower breakthrough and more apparent adsorption.
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