Effect of weathering on mobilization of biochar particles and bacterial removal in a stormwater biofilter

Water Research
Sanjay K Mohanty, Alexandria B Boehm

Abstract

To improve bacterial removal, a traditional stormwater biofilter can be augmented with biochar, but it is unknown whether bacterial removal remains consistent as the biochar weathers during intermittent exposure to stormwater under dry-wet and freeze-thaw cycles. To examine the effect of weathering on bacterial removal capacity of biochar, we subjected biochar-augmented sand filters (or simplified biofilters) to multiple freeze-thaw or dry-wet cycles for a month and then compared their bacterial removal capacity with the removal capacity of unweathered biofilters. To isolate the effect of physical and chemical weathering processes from that of biological processes, the biofilters were operated without any developed biofilm. Biochar particles were mobilized during intermittent infiltration of stormwater, but the mobilization depended on temperature and antecedent conditions. During stormwater infiltration without intermediate drying, exposure to natural organic matter (NOM) in the stormwater decreased the bacterial removal capacity of biochar, partly due to exhaustion of attachment sites by NOM adsorption. In contrast, exposure to the same amount of NOM during stormwater infiltration with intermediate drying resulted in higher b...Continue Reading

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Citations

Sep 15, 2019·Environmental Science and Pollution Research International·Argemiro L PedrosaGrasiele S Cavallini
Nov 17, 2016·Frontiers in Microbiology·Xiao LiangPhilip M Dixon
Jul 1, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Jianwei LiuMengfei Zhao
Apr 3, 2021·Environmental Pollution·Maryam GhavanloughajarSanjay K Mohanty
May 13, 2019·The Science of the Total Environment·Dong XuJiangyong Hu
Aug 25, 2018·Environmental Science & Technology·Guocheng LiuBaoshan Xing
Aug 23, 2021·Journal of Hazardous Materials·Basanta Kumar BiswalRajasekhar Balasubramanian

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