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Effect of Bioaugmentation on Performance of Intermittently Aerated Sewage Treatment Plant
정병곤,Jeong, Byung-Gon Korean Society of Environmental Health 2008 한국환경보건학회지 Vol.34 No.3
In order to improve reactor performance of existing sewage treatment plants, the feasibility of enhancing reactor performance by bioaugmentation using EM as bioaugmentation agent and the effects of anoxic: oxic time ratio on reactor performance were investigated. Continuous and intermittent aeration modes were compared under the 6 hr of HRT. Three different types of intermittent aeration modes, that is, 15 min, of anoxic:45 min of oxic, 30 min of anoxic: 30 min of oxic, and 45 min of anoxic: 15 min oxic respectively were chosen as test modes to study the effects of anoxic : oxic time ratios on reactor performance. The optimum anoxic: oxic time ratio was 30 min:30 min when considering simultaneous removal of organic, nitrogen and phosphorus. When applying EM into a continuously aerated reactor under the varying dosing rates of 50-200 ppm, reactor performance in terms of organic and nitrogen removal efficiencies was not improved at all. Nitrogen removal efficiency was increase when the EM dosing rate was increased. However the degree of improvement was slight when the EM was injected above 100 ppm. However optimum phosphorus removal was found at the EM dosing of 200 ppm. Thus it was found that optimum injection concentration of EM is 200 ppm. It is apparent that putting EM into a sewage treatment plant significantly affects the T-N removal efficiency of the reactor by enhancing denitrification efficiency especially in operational conditions of relatively long anoxic periods. To achieve reciprocal condition in a reactor with intermittent aeration it is necessary to enhance the reactor performance by EM injection. In the case of modifying existing continuously aerated reactors into intermittent aerated reactors, it is obvious that operating costs of aeration would be reduced by reducing aeration time when compared with existing conventional sewage treatment plants.
반응조 형태 및 슬러지층 유동화 특성에 따른 Upflow Anaerobic Sludge Blanket (UASB) 반응조의 운전효율
정병곤,Jeong Byung-Gon 한국환경보건학회 2006 한국환경보건학회지 Vol.32 No.2
Effect of organic loading rate on UASB performance was evaluated under the renditions of some surface area/reactor volume ratio and different reactor diameter. At the low leading rate of 0.4 kg $COD/m^3{\cdot}d$, reactor performance was not affected by reactor diameter. At the organic loading rate of 6 kg $COD/m^3{\cdot}d$, however, volatile acid accumulation and low COD removal efficiency is observed in reactor having 6.4 cm diameter, while volatile acid is not accumulated at all and high COD removal efficiency is observed in reactor having 3 cm diameter. Such a difference of reactor performance depending on reactor diameter can be explained that sludge bed can be fluidized by evolved gas bubble in narrow reactor, while sludge bed ran not be fluidized by evolved gas bubble only in wide reactor. At a high organic loading rate of 20 kg $COD/m^3{\cdot}d$, it can be judged that there is no relation between reactor configuration and reactor performance because all reactors showed very low COD removal efficiencies regardless of reactor diameter. Narrow and tall type reactor is favorable condition for making sludge bed fluidization at a constant surface area/reactor volume ratio. Thus, it can be judged that reactor configuration and sludge bed fluidization have great influence to reactor performance.
정병곤(Byung-Gon Jeong) 군산대학교 수산과학연구소 2004 군산대학교 수산과학연구소 연구논문집 Vol.4 No.-
Countenneasure for water quality management of Kunsan coastal area is studied. It is founded that Kunsan coast is the most polluted coast among 16 western coasts of Korea. Seawater quality of Kunsan coast is evaluated and compared using 5 year mean value in tenns of COD, T-N and T-P. Kunsan coast showed highest value in every 3 parameters. It can be estimated that Kunsan coast is greatly influenced by terrestrial activities when evaluated with NIP ratio. Such a high NIP ratio means that Kunsan coast is very susceptible to eutrophication and phosphorus is limiting factor in eutrophication. Minimizing and controlling phosphorus discharge from the terrestrial region is thought to be key factor of successful management of seawater quality in Kunsan coast. To control the phosphorus loading from terrestrial region, efficient strategies for managing wastewater from livestock farm should be established because it is evident that major source of phosphorus loading is livestock farms. In order to find out the major parameter that detennines the water quality of Kunsan coast, relative ratio of contributions were calculated. Kunsan city responsible for 11-15% in present seawater quality of Kunsan coast. Remaing 85-89% is comes from outside of Kunsan city. Thus, It is impossible to establish countenneasure for seawater quality management unless integrated counterplan is made for reducing pollutant loading from each watershed.
정병곤 ( Byung Gon Jeong ) 한국어업기술학회 2016 수산해양기술연구 Vol.52 No.3
Recently, pollution problem in coastal water has become more serious and pollution including red tide serves as a main reason for reduction of fishes resources. Particularly, nutrients such as nitrogen and phosphorus are the most serious pollutants. Normally, biological wastewater treatment process is used in removing such nutrients. However, it is difficult to adopt the biological wastewater treatment process to a small-scale fish processing factory in case of using seawater as wash water. Thus, removing nutrients through struvite crystallization is investigated in this study for treating shrimp processing wastewater. Experiments were conducted by varying molar ratio of Mg2+:NH4-N:PO4-P from 1:1:1 to 2:1:1. It can be concluded that optimum molar ratio is 1:1:1. Struvite crystallization process is compared with chemical coagulation process using PAC and struvite crystallization process is proven as the more effective process in removing nutrients from wastewater. In view of results obtained from these experiments, struvite crystallization process is a promising method in removing nitrogen and phosphorus from wastewater; however, not so good in removing organics. Thus, struvite crystallization process is suitable as the pre-treatment process in treating shrimp processing wastewater and additional biological process is needed to remove organics.
HILS 시스템을 활용한 OBD2 Leak Monitoring Logic 검증
정병곤(ByeongGon Jeong),고승찬(SeungChan Ko),김동석(DongSeok Kim),이보석(BoSuk Lee),한권희(KuenHee Han) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
The increasing complexity of ECU system makes high demands of the vehicle manufacturers who are responsible for the quality and safety for their vehicles. The current testing methods, however, which are carried out with specially equipped vehicles are time-consuming and inefficient. And, it is hard to make the testing conditions which guarantee safe operation of the ECU at all possible operation conditions. The burden of functional verification which related with OBD system is also increased by a lot of electrical parts and emission regulations. Also, the monitoring of evaporation leak performance is the one of main features of OBD systems. This study shows evaporation leak logic validation and more detail monitoring result about evaporation leak level during evaporation leak monitoring on the HILS environment that provides a real-time coupling of the physical hardware and computer simulation. An using the detailed classification about evaporation leak level and the detecting damaged valves has been developed to provide the benefit tool on the sophisticated evaporation leak logic design.