Influence of humic acid on the long-term performance of direct contact membrane distillation

Dong-Wan Cho, Gihoon Kwon, Jeongmin Han and Hocheol Song

Energy & Environment, 2019, vol. 30, issue 1, 109-120

Abstract: In this study, the influence of humic acid on the treatment of coalbed methane water by direct contact membrane distillation was examined with bench-scale test unit. During short-term distillation (1000 min), high level of humic acid above 50 ppm resulted in significant decrease in permeate flux, while low level of humic acid (∼2 ppm) had little influence on the flux. For the long-term distillation (5000 min), the flux decline began at 3400 min in the presence of 5 ppm humic acid and 5 mM Ca 2+ , and decreased to ∼40% of initial flux at 5000 min. The spectroscopic analysis of the membrane used revealed that the surface was covered by hydrophilic layers mainly composed of calcite. The membrane fouling effect of humic acid became more significant in the presence of Ca 2+ due to more facile calcite formation on the membrane surface. It was demonstrated that humic acid enhanced CaCO 3 deposition on the membrane surfaces, thereby expediting the scaling phenomenon.

Keywords: Coalbed methane water; membrane distillation; humic acid; calcium; scaling (search for similar items in EconPapers)
Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:sae:engenv:v:30:y:2019:i:1:p:109-120

DOI: 10.1177/0958305X18787279

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