A practical bio-based reversible permeability control for saturated sands
- 1 September 2021
- journal article
- research article
- Published by Thomas Telford Ltd. in Environmental Geotechnics
- Vol. 8 (6), 392-400
- https://doi.org/10.1680/jenge.18.00153
Abstract
There is a need for an eco-friendly in situ reversible permeability control that reduces the number of artificial materials used to achieve a saturated sand layer. This study investigates such a control using a method that causes calcite precipitation and decalcification based on the metabolism of carbon sources; this generates carbon dioxide and organic acid, and creates and detaches a biofilm using dry yeast and sodium hypochlorite. A pilot test determined the optimal chemical composition for this from a few different concentrations of carbon sources that begin the permeability reduction and recovery process. Following this, the main test (the permeability test) was conducted on a water sample taken from an agricultural area, which was combined with chemicals and dry yeast in a permeameter column. Permeability tests were carried out under three conditions (untreated, treated, and treated combined with a biofilm detachment phase). Our results suggest that (1) calcite precipitation induced by microbes, combined with bio-clogging, can control the reduction in soil permeability, and (2) a biofilm remover (sodium hypochlorite) and decalcification based on the organic acid created from the metabolism of carbon sources effectively recovered the soil permeability to its initial state.This publication has 29 references indexed in Scilit:
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