http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 원경자 (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
촉매 물질을 적용한 유전체 장벽 방전 플라즈마의 페놀 분해 특성 및 생분해도 향상
신관우,최승규,김진수,원경자,이상일 대한상하수도학회 2020 상하수도학회지 Vol.34 No.1
This study investigated the degradation characteristics and biodegradability of phenol, refractory organic matters, by injecting MgO and CaO-known to be catalyst materials for the ozonation process-into a Dielectric Barrier Discharge (DBD) plasma. MgO and CaO were injected at 0, 0.5, 1.0, and 2 g/L, and the pH was not adjusted separately to examine the optimal injection amounts of MgO and CaO. When MgO and CaO were injected, the phenol decomposition rate was increased, and the reaction time was found to decrease by 2.1 to 2.6 times. In addition, during CaO injection, intermediate products combined with Ca2+ to cause precipitation, which increased the COD (chemical oxygen demand) removal rate by approximately 2.4 times. The biodegradability of plasma treated water increased with increase in the phenol decomposition rate and increased as the amount of the generated intermediate products increased. The biodegradability was highest in the plasma reaction with MgO injection as compared to when the DBD plasma pH was adjusted. Thus, it was found that a DBD plasma can degrade non-biodegradable phenols and increase biodegradability.
-
수중 유전체 장벽 방전 플라즈마를 이용한 페놀의 분해 특성
신관우,이상일,최승규,김진수,주천,원경자 대한상하수도학회 2019 상하수도학회지 Vol.33 No.4
This study investigated the degradation characteristics of phenol, which is a refractory substance, by using a submerged dielectric barrier discharge(DBD) plasma reactor. In order check indirectly the concentration of active species produced in the DBD plasma, the dissolved ozone was measured. To investigate the phenol degradation characteristics, the phenol and chemical oxygen demand(COD) concentrations were evaluated based on pH and discharge power. The dissolved ozone was measured according to the air flow rate and discharged power. When the injected air flow rate was 5 L/min, the highest dissolved ozone concentration was measured. When the discharge power was 40 W as compared to 70 W, the dissolved ozone was approximately 2.7~6.5 times higher. Regarding the phenol degradation, the final degradation rate was 74.06%, which was the highest rate, when the initial pH was 10. When the discharged power was 40 W, the observed phenol decomposition rate was approximately 1.25 times higher compared to 70 W. It was determined that the phenol degradation reaction was a primary reaction, and when the discharge power was 40 W as compared to 70 W, the reaction rate constant(k) was approximately 1.72 times higher.
-
제올라이트 여재의 암모니아성 질소 이온교환 능력에 따른 ZBAF의 질산화 효율 비교
김진수 ( Jin-su Kim ),최승규 ( Seung-kyu Choi ),주천 ( Qian Zhu ),신관우 ( Gwan-woo Shin ),양창환 ( Chang-hwan Yang ),원경자 ( Kyoung-ja Weon ),이상일 ( Sang-ill Lee ) 한국수처리학회(구 한국수처리기술연구회) 2020 한국수처리학회지 Vol.28 No.2
This study was conducted to investigate nitrification by measuring the ammonia nitrogen adsorption ability of zeolite media. Zeolite adsorbs ammonia nitrogen through cation exchange. When zeolite is used as the filteration media in biological aerated filters (BAF), nitrifying bacteria can be easily attached. Using two types of zeolite that have different calcination temperatures, it was confirmed differences in nitrification rate relative to the ammonium ions exchange capacity of the zeolite media. The strength of the zeolite media was higher as calcination temperature was higher, while BET specific surface area was decreased. The ammonia nitrogen adsorption of the zeolite media at 600℃ was higher than at 900℃, but nitrification rates were similar when either media was used for the zeolite biological aerated filter (ZBAF). During the entire operation period, the 600℃ zeolite had an ammonia nitrogen removal rate of 0.31 kg/m<sup>3</sup>/d, and the 900℃ zeolite media had a rate of 0.28 kg/m<sup>3</sup>/d (p>0.05). When the influent was held on shutdown for a month and processing began again, the nitrification rate of the ZBAFs showed a similar amount of NO<sub>x</sub>-N (sum of the concentration of nitrite and nitrate nitrogen) production within two days of reoperation that was similar to the rate before shutdown. The effect of water temperature had little effect on rate. Ammonia nitrogen removal by ZBAFs was maintained in water temperatures as low as 5℃. However, the ammonia nitrogen removal and nitrification rate were decreased in 600℃ zeolite media after 3 months of operation because media’s morphology changed.
ScienceON
코리아스칼라연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
