http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
정용현,이은석,박순영,양창환,정진택,Chung, Yong-hyun,Lee, Eun-seok,Park, Soon-young,Yang, Chang-hwan,Jung, Jin-taeg 항공우주시스템공학회 2009 항공우주시스템공학회지 Vol.3 No.2
The structural analysis of liquid rocket engine was performed in the case of sinusoidal vibration load to verify structural safety. The finite element model is composed with main liquid rocket engine components, combustion chamber, turbopump, gas-generator, pyro-starter, main pipes, main valve, heat-exchanger, gimbal-mount and brackets. Natural vibration mode analysis and structural analysis for sinusoidal vibration load were performed. The natural mode frequency of liquid rocket engine is twice than that of launch vehicle. In the case of stress result of sinusoidal vibration load, the part of maximum stress has 1.4 margin, so the engine structure is safe for sinusoidal vibration load.
권중천 ( Joong Chun Kwon ),문서연 ( Seo Yeon Moon ),양창환 ( Chang Hwan Yang ),최경민 ( Kyung Min Choi ) 한국물환경학회 2002 한국물환경학회지 Vol.18 No.6
In this study, a biofilter was applied to a municipal wastewater reuse system. It is an effective unit process in which the biological oxidation by the biofilm attached on the media and the filtration by the packed media happen simultaneously. First of all, the denitrification efficiency of this process was assessed according to the HRT, influent COD/N ratio, and media type. As a result, the effluent NO_3^--N concentration was less than 2 mg/L at the HRT 1∼3hr, and then denitrification efficiency ranged 74∼95 %. Without regard to the type of media used to pack biofilter, a maximum denitrification rate of about 164 g NO_3^--N/m^3-d was achieved with methanol, than the required COD/N ratio was close to 4.5 g COD/g NO_3^--N. And the biofilter was scaled up and operated for the treatment of the municipal wastewater passed through the biological advanced treatment. Under the filtration rate of 0.25∼0.5 m/hr, effluent SS concentration was less than 6 mg/L. If the filtration rate is increased, it have to increase that the media packed layer of the biofillter.
생물학적 재생기법이 적용된 제올라이트계 여재의 저농도 암모니아성 질소 처리
김진수 ( Jin-su Kim ),이지영 ( Ji-young Lee ),김수진 ( Su-jin Kim ),강민구 ( Min-koo Kang ),박종택 ( Jong-taek Park ),양창환 ( Chang-hwan Yang ),이상일 ( Sang-ill Lee ) 한국수처리학회 2016 한국수처리학회지 Vol.24 No.6
This study was conducted to removal of low ammonia nitrogen. ball-type zeolites were used to adsorb ammonia nitrogen and regenerated simultaneously by attached nitrifiers. Prior to main experiment, adsorption rate and amount of adsorption was confirmed by pseudo second-order kinetic model and Freundlich, Langmuir isotherm models. Comparison of normal ball-type zeolite and nitrifiers-attached ball-type zeolite were proceeded in order to evaluate for nitrification(biological regeneration). And continuous operating experiment was operated in 1.6 L reactor at empty bed contact time(EBCT) 25 minute to check the possibility of continuous operation. In the result of experiment, only nitrifiers-attached ball-type zeolite was occurred nitrification(biological regeneration). And continuous operating experiment result during 32 days, it could constantly adsorbed the ammonia nitrogen during operating time.