A feasibility study of ammonia recovery from coking wastewater by coupled operation of a membrane contactor and membrane distillation

Po Hsun Lin, Ren Yang Horng, Shu Fang Hsu, Shiao Shing Chen, Chia Hua Ho

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

More than 80% of ammonia (NH3) in the steel manufacturing process wastewater is contributed from the coking wastewater, which is usually treated by biological processes. However, the NH3 in the coking wastewater is typically too high for biological treatment due to its inhibitory concentration. Therefore, a two-stage process including a hollow fiber membrane contactor (HFMC) and a modified membrane distillation (MD) system was developed and applied to reduce and recover NH3 from coking wastewater. The objectives of this paper are to evaluate different membrane materials, receiving solutions, and operation parameters for the system, remove NH3 from the coking wastewater to less than 300 mg N/L, which is amenable to the biological process, and recover ammonia solution for reuse. As a result, the polytetrafluoroethylene (PTFE) HFMC using sulfuric acid as a receiving solution can achieve a maximum NH3-N transmembrane flux of 1.67 g N/m2·h at pH of 11.5 and reduce NH3 in the coking wastewater to less than 300 mg N/L. The NH3 in the converted ammonium sulfate ((NH4)2SO4) was then recovered by the modified MD using ice water as the receiving solution to produce ≥3% of ammonia solution for reuse.

Original languageEnglish
Article number441
JournalInternational Journal of Environmental Research and Public Health
Volume15
Issue number3
DOIs
StatePublished - 3 Mar 2018

Keywords

  • Ammonia
  • Coking wastewater
  • Hollow fiber membrane contactor
  • Membrane distillation
  • PTFE hollow fiber

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