Selection of permeable reactive barrier materials for treating acidic groundwater in acid sulphate soil terrains based on laboratory column tests |
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| Authors: | Alexandra N Golab Mark A Peterson and Buddhima Indraratna |
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| Institution: | (1) CRC for Greenhouse Gas Technologies, Canberra, ACT, 2601, Australia;(2) ANSTO, Lucas Heights, NSW, Australia;(3) University of Wollongong, Wollongong, NSW, 2522, Australia |
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| Abstract: | The Shoalhaven region of NSW experiences environmental acidification due to acid sulphate soils (ASS). In order to trial an
environmental engineering solution to groundwater remediation involving a permeable reactive barrier (PRB), comprehensive
site characterisation and laboratory-based batch and column tests of reactive materials were conducted. The PRB is designed
to perform in situ remediation of the acidic groundwater (pH 3) that is generated in ASS. Twenty-five alkaline reactive materials
have been tested for suitability for the barrier, with an emphasis on waste materials, including waste concrete, limestone,
calcite-bearing zeolitic breccia, blast furnace slag and oyster shells. Following three phases of batch tests, two waste materials
(waste concrete and oyster shells) were chosen for column tests that simulate flow conditions through the barrier and using
acidic water from the field site (pH 3). Both waste materials successfully treated with the acidic water, for example, after
300 pore volumes, the oyster shells still neutralised the water (pH 7). |
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