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 and Chia-Hua Ho
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Po-Hsun Lin: Department of Safety, Health and Environmental Engineering, Ming Chi University of Technology, No. 84 Gungjuan Rd., Taishan Dist., New Taipei City 24301, Taiwan
Ren-Yang Horng: Material and Chemical Research Laboratories, Industrial Technology Research Institute, 321 Sec. 2, Kuang Fu Rd., Hsinchu 300, Taiwan
Shu-Fang Hsu: Material and Chemical Research Laboratories, Industrial Technology Research Institute, 321 Sec. 2, Kuang Fu Rd., Hsinchu 300, Taiwan
Shiao-Shing Chen: Institute of Environmental Engineering and Management, National Taipei University of Technology, No.1, Sec. 3, Chung Hsiao E. Rd., Taipei 106, Taiwan
Chia-Hua Ho: Material and Chemical Research Laboratories, Industrial Technology Research Institute, 321 Sec. 2, Kuang Fu Rd., Hsinchu 300, Taiwan

IJERPH, 2018, vol. 15, issue 3, 1-12

Abstract: More than 80% of ammonia (NH 3 ) in the steel manufacturing process wastewater is contributed from the coking wastewater, which is usually treated by biological processes. However, the NH 3 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 NH 3 from coking wastewater. The objectives of this paper are to evaluate different membrane materials, receiving solutions, and operation parameters for the system, remove NH 3 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 NH 3 -N transmembrane flux of 1.67 g N/m 2 ·h at pH of 11.5 and reduce NH 3 in the coking wastewater to less than 300 mg N/L. The NH 3 in the converted ammonium sulfate ((NH 4 ) 2 SO 4 ) was then recovered by the modified MD using ice water as the receiving solution to produce ≥3% of ammonia solution for reuse.

Keywords: ammonia; coking wastewater; hollow fiber membrane contactor; membrane distillation; PTFE hollow fiber (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2018
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