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EFFECT OF BRINE SOLUTION ON ANTIOXIDANTS OF HDPE GEOMEMBRANES
Session: Barriers and Geosynthetics / Barrières et géosynthétiques
MOHAMAD SHOAIB, Queen's University, Kingston, Canada (Canada)
Kerry Rowe, Queen's University Kingston, Canada (Canada)
(HDPE) geomembranes (GMBs) are used as the primary bottom liner for brine storage and evaporation ponds. The brine arising from the processing of waters recovered from shale or coal gas extraction often contains sodium chloride (NaCl), sodium carbonate (NaHCO3) and sodium bicarbonate (Na2CO3) at very high concentrations. This paper describes an experimental examination of the ageing of four different GMBs immersed in brine solution at four different temperatures to monitor the depletion rate of antioxidants/stabilizers added to the GMB formulation to protect the GMB both during manufacturing and subsequently when deployed in the field. The depletion rate of antioxidants depends on several factors, including the amount and type of antioxidants/stabilizers, temperature, the GMB exposure conditions, the diffusion/extraction of antioxidants from the GMB, and the chemical composition of the fluids with which the GMB is in contact. There is a paucity of published research examining the chemical compatibility of HDPE GMB with brine solution. The tests are intended to provide insight regarding the antioxidant depletion rate and its impact on the time to nominal failure of HDPE GMB and therefore will help to provide an estimate of the service life of four different HDPE GMBs immersed in a brine solution.
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