Dewatering of source-separated human urine for nitrogen recovery by membrane distillation
- Dewatering of source-separated human urine for nitrogen recovery by membrane distillation
- 이석헌; 배효관; 정성필; 정다운; 조경진; Lat Lat Tun
- Human urine; Ammonia enrichment; Membrane distillation
- Issue Date
- Journal of membrane science
- VOL 512, 13-20
- The nitrogen content of a synthetic ammonia wastewater was concentrated using direct contact membrane distillation (DCMD). The ratio of transferred ammonia to water (i.e., specific ammonia transfer: SAT) was controlled by operational conditions. With 20 °C on the permeate side, and a high temperature of 70 °C on the feed side, the process exhibited low SAT values for PTFE/PP (PTF045LD0A), PTFE/PP (TF-450), and PVDF (HVHP-14250) membranes. This was because the increase in water flux (>24 L/m2 h) was greater than that of ammonia transfer. A positive relationship between SAT and free ammonia concentration was identified under different total ammoniacal nitrogen concentration and pH. The acidification pretreatment to pH 5 led to further reduction in the SAT value (as low as 6.91×10− 5 g-N/g-H2O). As a practical application, the dewatering process of source-separated human urine by DCMD required an additional filtration step to prevent fouling, but the filtration had an insignificant effect on the SAT. For the acidified and filtered source-separated human urine, total ammoniacal nitrogen was successfully concentrated with a low SAT value (<2.06×10− 3 g-N/g-H2O).
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