%0 Journal article
%A Miyajima, K.
%A Noubactep, C.
%T Impact of Fe0 amendment on methylene blue discoloration by sand columns
%R 10.1016/j.cej.2012.11.128
%R 10.23689/fidgeo-2457
%J Chemical Engineering Journal
%V 217

%X The influence of metallic iron (Fe0) amendment on the efficiency of sand to discolor a 2.0 mg L-1 methylene blue (MB) solution was investigated in column studies. MB was used as an indicator to identify the optimum Fe0/sand ratio for efficient filtration systems. Columns contained 0, 100 or 200 g of a Fe0 material. The volumetric proportion of Fe0 in the reactive layer of the columns with 100 g of material varied from 10 to 100 %. Results showed that, Fe0 amendment significantly impaired MB discoloration by sand for experiments lasting for up to 132 days. Early MB breakthrough in Fe0/sand columns delineated the paramount importance of particle cementation, which has caused preferential flow with a negative impact on discoloration efficiency. The most efficient Fe0/sand mixtures were the ones with 30 to 50 % Fe0 (v/v). These volumetric ratios correspond 33 to 41 % weight ratios showing that the commonly used 1:1 weight ratio (50 %) may not be optimal. Further research with compounds exhibiting different affinities to both Fe0 and sand is needed before this observation can be generalized.
%U http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/6770
%~  FID GEO-LEO e-docs