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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.
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.
정병곤 ( Byung-gon Jeong ),장호영 ( Ho-young Chang ) 한국어업기술학회 2017 수산해양기술연구 Vol.53 No.1
In order to investigate the effect of land reclamation on the life of local fishermen, a survey was conducted with the 246 people living in 12 different adjacent villages located in Hwasung District. It was found that income of residents decreased, while the amount of debts increased after reclamation. 65% of the people surveyed answered that their economic situation became worse than before and they blamed the decrease of fishery resources as the main cause. It further led to the loss of the family`s means of livelihood. 40% of the people surveyed claimed that they wanted to leave the fishing village and believed that reclamation divested them of all their hope for the future. Regarding to the effect of reclamation project on the image of Hwasung District, most of the respondents have a negative view on the reclamation project. They have negative views even on the tourism, regional welfare, employment of community residents and local infrastructure. Therefore, it can be concluded that local community residents thought that reclamation project had negatively influenced their overall quality of life.
정병곤(Byung Gon Jeong),장수현(Soo Hyun Chang) 군산대학교 수산과학연구소 2004 군산대학교 수산과학연구소 연구논문집 Vol.4 No.-
Environmental problems associated with Saemangeum project are evaluated through litera-ture review. The main purpose of this research is to study what is major problems of present counterplan for pollution abatement in Saemangeum area and to study how to cope with situation. Two major problems are pointed out. The one is economic comparison between conserving the wet land and reclamation should have done and environmental impact assessment of Saemangeum project was not appropriate. The other is existing countermeasure for maintaining water quaJity of Saemangerm lake to desired level is not satisfactory. When considering the fact that about 35% of dike is built already, not only simple stopping of dike construction without any provision of ecological remediation programe in Saemangeum wetland but also continuing reclamation project without further provision of pollution abatement can not be justified in view of environmental standpoint. It is inevitable to avoid serious water poJiution of Saemangeum lake unless substantial revion will be made to existing poJiution abatement program. Additional counterplan should be provided as soon as possible. It is necessary that construction and repairing sewer system, control and management of non-point source, construction of nutrient removal syst41em should be included in existing plan for the reduction of pollutant load.Excess discharge of phosphorus from watershed is typical characteristics of area. Main source of phosphorus is animal wastes that acts as non-point source pollutant. Thus, control and management of animal wastes is key factor in reducing phosphorus loading from Saemangeum watershed. It is apparent that not only schemes for reducing pollutant loading from Saemangeum watershed but also schemes for improving water quality of Saemangeum lake should be revised in order to meet desired water quality standard. Using 470 million tons/yr of Keum river water as dilution water and dischsrging bottom water of lake periodically to open sea are the main counterplans provided by Rural Development Corporation for improving water quality of Saemangeum lake. However, It seems that these counterplans have some problems. In stead of it, several counterplans can be suggested for improving water quality of Saemangeum lake. In view of water quality, it is doubt that whether Keum river can be used as dilution water or not. It is thought that minimizing lake capacity and allocation of several small lakes instead of one big lake, instal1ing forced vertical circulating system using aerator are better counterplan than present scheme, that is, discharging bottom water of lake periodically to open sea. Designation of Saemangeum watershed as the special counterplan region based on law can be recommended. Land development plan after reclamation should be determined as soon as possible before completion of dike construction.
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.