Abstract
Nowadays heavy metals especially Cr have posed a serious threat to water bodies due to environmental
pollution. The tannery industries in Bangladesh have been releasing a significant amount of Cr for years to the
environment. The current research works focus on the efficient removal of Cr from tannery effluents using rice
husks and coconut shell as natural adsorbents. Chromium concentration determined was 1500 mg L-1 which is
alarmingly high in effluents just after chrome tanned discharge, and that was 1.30 mg L-1 Cr in effluents from
dumping storage. Rice hush and coconut shell adsorbent were applied to remove Cr. Chemical modifications
by treating rice husks with coconut shell increased the adsorption ability of rice husks for Cr removed. Among
these adsorbents rice husks of 50 mesh size (particle size 0.297 mm) showed the maximum adsorption (98%)
within 6 hours without any stirring effect. However, rice husks of 200 mesh size (particle size 0.297 mm)
showed the adsorption (67%) within 6 hours with any continuous stirring effect. These results suggest that
cheaply available rice husks can be considered as a good adsorbent for the removal of Cr from tannery
effluents.
Mohammad Farhan Islam, Md Shafiul Islam, Sony Ahmed, Muhammed Yusuf Miah. (2020) Removal of chromium from effluent of tannery industries in Bangladesh using rice husks as natural adsorbent, The Journal Soil & Environment , Volume 39, Issue 2.
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