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

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  • Dong-Wan Cho
  • Gihoon Kwon
  • Jeongmin Han
  • Hocheol Song

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.

Suggested Citation

  • Dong-Wan Cho & Gihoon Kwon & Jeongmin Han & Hocheol Song, 2019. "Influence of humic acid on the long-term performance of direct contact membrane distillation," Energy & Environment, , vol. 30(1), pages 109-120, February.
    • Handle: RePEc:sae:engenv:v:30:y:2019:i:1:p:109-120
    DOI: 10.1177/0958305X18787279
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    References listed on IDEAS

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    1. Kabeel, A.E. & Abdelgaied, Mohamed & El-Said, Emad M.S., 2017. "Study of a solar-driven membrane distillation system: Evaporative cooling effect on performance enhancement," Renewable Energy, Elsevier, vol. 106(C), pages 192-200.
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