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정수장 단위 정수공정의 미생물 제거에 대한 실험실 규모 평가
염철민 ( Yeom Cheol Min ),조순행 ( Jo Sun Haeng ),정현미 ( Jeong Hyeon Mi ),손진식 ( Son Jin Sig ),박수영 ( Park Su Yeong ),윤제용 ( Yun Je Yong ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.4
The removal behavior of indicating microorganisms, such as HPC (Heterotrophic Plate Counts) and Bacillus subtilis endospore in water treatment process was investigated. Jar and column test were chosen to simulate flocculation/sedimentation. filtration process, and disinfection individually. The 1.7-1.8 log removal of HPC was achieved in flocculation/sedimentation. And 2.5 -2.6 log and 2.8-2.9 log total removal of HPC was reached by combined process of sand filter and dual media filtration process. This result indicates that a good flocculation/sedimentation process is important to acquire a high level of removal of indicating microorganisms. This tendency may be more important for protozoa removal such as Giardia and Cryptosporidium which is much larger in size. In addition, the flocculation/sedimentation/filtration process contributed to the 35 % reduction of CT values required for achieving the inactivation of 2-109 Bacillus subtilis under the same chlorine exposure environment.
염철민 ( Yeom Cheol Min ),최유식 ( Choe Yu Sig ),조순행 ( Jo Sun Haeng ),윤제용 ( Yun Je Yong ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.1
This study was conducted to investigate the characteristics of disinfection by-products formation potential (DBPFPs) in various organic sources. Twenty three different samples were chosen and were divided into three groups; Group 1 (n=14) includes water samples from surface water such as rivers and reservoir, Group 2 (n=5) includes water samples from municipal wastewater treatment plant and primary treatment effluent of night soil, Group 3 (n=4) includes rain water and organics leached from soil and sediment. The type of DBPs investigated were trihalomethanes (THMs), haloacetic acids (HAAS), total organic halides (TOX). Major findings are as follows. First, average SUVA values of most samples were found to be around 2 (ℓ. cm^(-1)/㎎). This indicates that most dissolved organics in surface water and in municipal waste water consist of hydrophilic organic component, supporting the previous report. Second, for most of samples, the range of specific DBPFPs (THMFPs, HAAFPs and TOXFPs)/DOC at 7day incubation existed in the range of 40-60 (average 54) ㎍/㎎ C, 30-120 (average 90) C and 80-250 (average 179) ㎍/㎎ C. respectively. It is noted that THMFPs/DOC and HAAFPs/DOC were found to be relatively higher in dissolved organics from soil samples. Third, DBPs (THMs, HAAs, TOX) in most of samples were increased with time. THMs at 7day incubation increased almost twice compared with that at 3 day incubation. For HAAs and TOXs, despite of the overall increase, some data were found to be decreased with time.
분리기술,열역학 : Ag(+)/aluminosilica 흡착제에 대한 에탄과 에틸렌의 흡착특성 연구
손의락 ( Son Ui Lag ),한상섭 ( Han Sang Seob ),박종호 ( Park Jong Ho ),김종남 ( Kim Jong Nam ),조순행 ( Jo Sun Haeng ),이태종 ( Lee Tae Jong ) 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.6
To produce high concentration of ethylene, new adsorbents were synthesized by incipient wetness method of AgNO₃ on aluminosilica. Cahn balance was used to measure pure isotherms of C₂H₄ and C₂H₄ and volumetric apparatus was used to measure C2H4-C2H6 binary isotherms. Adsorption isotherms of pure gases were measured at 298.15 K, 323.15 K and 353.15 K, pressure ranges are from 0 mmHg to 5,100 mmHg. Pure ethane isotherm showed good agreement with Langmuir isotherm and pure ethylene isotherm showed good agreement with Langmuir-Freundlich and Langmuir+Unilan isotherms which were derived from considering physical site and chemical site. The decrease in heat of adsorption of ethylene with increasing the coverage was observed and the same result in case of ethane. Langmuir-Freundlich isotherm, Toth isotherm and ideal adsorbed solution(IAS) model were used to calculate isosteric heats of adsorption, and also used to predict binary isotherms.