(86b) Adsorption Kinetics of N-Nitrosodimethylamine (NDMA) Onto Activated Carbons
AIChE Spring Meeting and Global Congress on Process Safety
2021
2021 AIChE Virtual Spring Meeting and 17th Global Congress on Process Safety
Environmental Division
Environmental Issues and Controls in Select Industrial Sectors I
Wednesday, April 21, 2021 - 11:20am to 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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