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하수처리장 실시간 유입수 COD 추정을 위한 부유물질(SS), 전기전도도(EC) 및 OUR의 활용성에 관한 연구
서인석 ( In Seok Seo ),김연권 ( Yeon Kwon Kim ),김홍석 ( Hong Suck Kim ),김지연 ( Ji Yeon Kim ) 한국수처리학회 2013 한국수처리학회지 Vol.21 No.6
Recently, water quality of effluent in sewage treatment plant has been monitored in real time by TMS(Tele-Monitoring System). Therefore, early detection of sudden fluctuation of influent concentration in STP has taken on greater importance. For this reason, some researcher studied on the application of simplified mathematical model in operation of sewage treatment plant. However, due to complexity of various parameter application and fractionation of influent COD used in mathematical model, therefore, there are limit still in application. In this research, suspended solids, conductivity and OUR(oxygen uptake rate) was evaluated to develop on-line influent COD monitoring methods. Theoretically, suspended solids, conductivity and OUR are related to particulate, ionic and biodegradable COD, respectively. In evaluation of co-relationship, SS, EC and OUR have a good co-relationship in particulate, ionic soluble COD(acetate, R2=1) and RBCOD, respectively, whereas EC have no response to nonionic soluble COD(glucose, R2=0.37). Therefore, combination of SS and OUR was more efficient in COD concentration prediction of sewage influent. Influent COD values in real time can be importantly utilized in operation strategy of STP.
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KSDeN(TM) 공정에 의한 질소, 인 제거에 있어서 수온, C/N비 및 C/P비의 영향
서인석 ( In Seok Seo ),김병군 ( Byung Goon Kim ),홍성택 ( Sung Taek Hong ),박철휘 ( Chul Hwi Park ),김도군 ( Do Gun Kim ),천상욱 ( Sang Ook Chun ) 한국물환경학회 2002 한국물환경학회지 Vol.18 No.6
In this study. the effects of temperature, C/N ratio and C/P ratio on the nutrients removal efficiencies of an intermittent aeration activated sludge process(KSDeN^TM process) were investigated with a pilot plant fed with the grit chamber effluent of `J` MWWTP. The effluent TCOD_Cr, and TBOD_5 were less than 10 mg/L, although the influent concentrations of organics and nutrients showed wide fluctuations. T-N removal efficiency and nitrification efficiency increased with increasing temperature and C/N ratio. The results of this study showed that the performance of KSDeN^TM process was more sensitive to the variation of temperature than that of C/N ratio, However, T-N removal efficiency was more than 60% at 10℃, and more than 70% at low C/N ratio of 3.0. T-P removal efficiency was more than 80% at C/P ratio of 30 or above, and it was higher at relatively low temperature and high C/P ratio (TCOD_Cr/T-P ratio), It is considered that the competition on organic compounds between PAOs and denitrifiers resulted in lowering T-P removal by activating nitrifiers with increasing temperature.
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서인석(Seo In Seok),권기헌(Kwon Gi Heon),이동규(Lee Dong Kyu) 한국부패학회 2009 한국부패학회보 Vol.14 No.4
This study as follows to propose the problem decreasing corruption is suggesting as core issue in global dimension without developed or non-developed nations. This is because corruptions are not only between a sort of deviation and problem creating non-developed countries but also problem relating to govern every nation involving developed countries(yuen, 2002: 72). That is, national corruptions decrease national reliability, which is able to between give unreliability about nation and low nation capability to a people. In this context, this paper is focusing on research related to Nation's Competitiveness influenced by nation's corruption. A certain corruption influences a specific nation, which is significant applications. Moreover, specific corruptions embeds national contexts(or social contexts). This study will look for, firstly, Developed counties type has appeared statistically significant interaction term variables, which was both education corruption and parliament corruption. Secondly, South American countries type has emerged statistically significant interaction term variable, which was police corruption. Finally, East Asia countries type has occurred interaction term variable, which was NGO corruption. As a result, research results are match to Peter Evans(1985: 191)'s "state autonomy", which is theoretical conceptions discussed as Predatory Autonomy, Third Autonomy, and Embedded Autonomy. Just, Predatory Autonomy is not considered to my research because samples of Africa countries involved to Predatory Autonomy are deficient.
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MBR 및 A2/O 공정에서 수온이 질산화에 미치는 영향
서인석 ( In Seok Seo ),김연권 ( Youn Keon Kim ),김홍석 ( Hong Suck Kim ),김지연 ( Ji Yeon Kim ) 한국수처리학회 2011 한국수처리학회지 Vol.19 No.4
Biological nitrification-denitrification is a common method of nitrogen removal in domestic wastewater. The process of nitrification is the limiting step in determining the efficiency of the nitrogen removal. The primary organisms responsible for nitrification in activated sludge are the autotrophs such as Nitrosomonase and Nitrobacter. In this research, the effect of temperature on nitrification was evaluated. Nitrification process was strongly dependent on temperature. The inhibitory effect of decreased temperature was greater for Nitrosomonase than for Nitrobacter. Also, relationship between temperature and ammonia nitrogen removal rate was linear, but, in case of nitrate formation, it was exponential. The temperature coefficient(b) was 0.0986 and similar with other researcher. In real plant operation(22,000㎥/day, A2/O process), the same pattern of temperature effect on nitrification was observed. Especially, although temperature was same range, due to difference in population of nitrifying microorganism, the greater effect was observed at moving period from winter to spring than from fall to winter. Temperature and ML(V)SS concentration in design of nitrification reactor should be considered as a key parameter. Also, operating strategies like as increase of biomass concentration and aerobic mass fraction at low temperature of less than 12℃ should be properly utilized.
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탄소중립을 향한 해양 기후위기 대응정책과 국가경쟁력 제고의 경로
서인석 ( In Seok Seo ),남기동 ( Ki Dong Nam ),이유현 ( Youhyun Lee ) 성균관대학교 국정전문대학원 2021 국정관리연구 Vol.16 No.4
This study analyze the relationship between marine carbon regulation and national competitiveness on OECD countries' efforts to reduce carbon. The hypothesis path is as follow; R&D support and regulation reduces the amount of carbon generated in the ocean and ultimately increases national competitiveness. In order to analyze the causal structure of OECD countries with few samples, the fuzzy set analysis was applied as a methodology. Based on the analysis results, some implications are as follows. First of all, Maritime regulations themselves cannot affect national competitiveness, but if regulations reduce carbon, it can contribute to national competitiveness. Second, marine R&D support can contribute to national competitiveness, and national competitiveness can be enhanced through the process of lowering carbon. Third, the theoretical relationship between the climate action and national competitiveness was explored in the marine area. This study is meaningful in confirming that these efforts can be confirmed as 'science' rather than 'belief'. Fourth, this study expanded the horizon of fuzzy set research. This study proposed another approach for future research by applying the fuzzy set method to path analysis.
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