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스윕 가스-진공 혼합식 탈기막 시스템을 활용한 암모니아 제거
윤홍식,민태진,이건희,김형탁,신완호,Yoon, Hongsik,Min, Taijin,Lee, Gunhee,Kim, Hyoung-Tak,Shin, Wanho 한국산업융합학회 2022 한국산업융합학회 논문집 Vol.25 No.5
In this study, the membrane degassing process of the sweep gas - vacuum combination type was proposed for ammonia wastewater treatment. The effect of pH, initial ammonia concentration and scale-up on ammonia degassing performance was investigated. As a result, as the pH and the initial ammonia concentration increased, the degassing permeate flux was improved. On the other hand, the ammonia mass transfer coefficient increased as the initial ammonia reduced, which seems to be due to the driving force of the sweep gas-vacuum combination type membrane degassing system proposed in this study. In addition, 80 mg NH<sub>3</sub>/min of the ammonia degassing rate was achieved using a 6×28 inch size module. Better degassing performance is expected if consideration for maintaining vacuum pressure is involved in the scale-up design.
코로나 19 고발열 의료폐기물이 소각시설 대기오염물질 배출특성에 미치는 영향
이은송 ( Eunsong Lee ),김진태 ( Jintae Kim ),이정규 ( Jungyu Lee ),신완호 ( Wanho Shin ),한소영 ( Soyoung Han ),홍원석 ( Wonseok Hong ),윤진한 ( Jinhan Yun ) 한국폐기물자원순환학회 2022 한국폐기물자원순환학회지 Vol.39 No.6
This study evaluated the effect of the COVID-19 pandemic on nitrogen oxides emissions from a medical waste incinerator. During the summer vacation season and year-end periods, the amount of medical waste as well as COVID- 19 patients dramatically increased by 2 to 6 times. In addition, nitrogen oxide emissions increased by approximately 30 % due to the injection of high calorific medical waste into the medical waste incinerator. The increase in medical waste calorific value is attributed to the exclusion of diapers from the medical waste classification and the composition of synthetic resins in waste transport containers. By applying the energy conservation law, the estimated waste calorific value for the months with the highest and lowest nitrogen oxides emissions were ~5,250 kcal/kg and 4,760 kcal/kg, respectively. The correlation between waste calorific value and nitrogen oxide was confirmed. However, the calorific value of medical waste varies for each transport container, and there is a limit in constantly controlling the calorific value of the injected waste. Therefore, to minimize the environmental impact of medical waste incinerators, it is necessary to apply combustion optimization technologies such as flue gas recirculation and air staging combustion to control air pollution.