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변형된 혐기 - 호기법을 이용한 폐수처리에 관한 연구 - 1 . 유기물 농도변화에 따른 영향 -
박우균,정광용,신응배 ( Woo Kyun Park,Kwang Yong Jung,Eung Bai Shin ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.4
In most cases, wastewater treatment processes have been developed for the treatment of organic matters and suspended solids. However, the removal of nitrogen and phosphorus from wastewater have attracted little attention. This study seeks a possibility of cost reduction and of simple to operation through a modification of existing processes which have already been well developed. The study was conducted to evaluate removal efficiencies of organic matter, nitrogen and phosphorus which are coexistent in wastewater. The laboratory scale experiment was done in using various concentrations of synthetic wastewater. BOD removal efficiency between modified anaerobic-oxic process and activated sludge process was similar 94.7%, 91.4%, respectively. Nitrogen and Phosphorus removal efficiency were 81.67%, 87.91%, respectively in modified anaerobic-oxic process, but nitrogen and phosphorus removal efficiency in activated sludge process were only 32.88%, 65.17%, respectively. The removal efficiency of organic matter in anaerobic-oxic process with was observed to be 94% regardless of influent concentration of organic matter with of wastewater, and over 80% removal being occurred in anaerobic tank. Nitrogen removal efficiency in nitrogen level of 25, 50 and 75㎎/l of inflow were 43.14, 81.67 and 41.54%, respectively. Higher nitrogen removal efficiency was observed with a higher influent concentration of nitrogen. In case of simultaneous result was not observed. The results demonstrated that the modified anaerobic-oxic process may better be applied to a rural treatment plant for a simultaneous removal of organic matter, nitrogen and phosphorous.
박우균 ( Woo Kyun Park ),전항배 ( Hang Bae Jun ),권순익 ( Soon Ik Kwon ),채규정 ( Kyu Jung Chae ),박노백 ( Noh Back Park ) 한국환경농학회 2010 한국환경농학회지 Vol.29 No.2
This study was conducted to investigate the optimum conditions for efficient methane production through anaerobic digestion of pig waste slurry. The examined parameters were organic matter content of the pig slurry, the ratio of seed sludge to pig slurry, and stirring intensity of the digestion reactor. The effects of types of slurry produced from different purpose-based pigs fed with different feeds were also tested. The methane concentration in the produced biogas was 45% when the ratio of seed sludge to pig slurry was 50% and total solid (TS) concentration was 1%, and it increased in proportional to TS concentration increases from 3 to 7%. At 3 and 5% of TS concentration, increasing mixing velocity from 80 to 160 rpm resulted in higher biogas production amount. However, mixing amount of seed sludge did not cause any significant effect on biogas production. Overall, the most efficient biogas production was achieved at 3-5% TS concentration in combination with 50% seed sludge inoculation and mixing velocity at 120 rpm. Among pig slurry types, gestating sow waste slurry showed the highest biogas production probably due to higher the degradation rate than other types of pig waste slurry being affected by the feeds components.
박우균 ( Woo Kyun Park ),박노백 ( Noh Back Park ),신중두 ( Joung Du Shin ),홍승길 ( Seung Gil Hong ),권순익 ( Soon Ik Kwon ) 한국환경농학회 2011 한국환경농학회지 Vol.30 No.3
BACKGROUND: Currently, national biomass inventory are being established for efficient management of the potential energy sources. Among the various types of biomass, agricultural wastes are considered to take the biggest portion of the total annual biomass generated in Korea, implying its importance. However, the currently estimated amount is not reliable because the old reference data are still used to estimate total annual amount of agricultural wastes. METHODS AND RESULTS: Therefore, to provide reliable estimation data, a correct conversion factor obtained by taking into account the current situation is required. For this, the current study was conducted to provide the conversion factors for each representative 8 crop through a field cultivation study. Also conversion factors for 18 crops were calculated using the average amount of each crop produced during 2004 and 2008, subsequently; total amount of agricultural wastes generated in 2009 was estimated using these conversion factors. The total biomass of rice straw and rice husk generated in 2009 were 6.5 and 1.1 million tons, respectively, which consist 75% of the total agricultural based wastes, while the total biomass of pepper shoots and apple pruning twigs were 1.0 and 0.6 million tons, respectively. Despite the high amount of rice-based biomass, their applicability for bio-energy production is low due to conventional utilization of these materials for animal feeds and beds for animal husbandry. In addition to exact estimation of the total biomass, temporal variatio1ns in both generated amount and the type of agricultural biomass materials are also important for efficient utilization; fruit pruning twigs (January to March); barley-, been-, and mustard-related waste materials (April to June); rice-related waste (September to October). CONCLUSION(s): Such information provided in this study can be used to establish a master plan for efficient utilization of the agricultural wastes on purpose of bio-energy production.
박우균 ( Woo Kyun Park ),정항배 ( Hang Bae Jun ),박노백 ( Noh Back Park ),홍승길 ( Seung Gil Hong ) 한국환경농학회 2010 한국환경농학회지 Vol.29 No.4
The current study investigated the fate of organic matter in piggery slurry under two different store systems(closed store system and open store system) in association with different temperature. Thirty days after storing in both systems at 20℃, it was observed that the content of organic matter remained in piggery slurry with closed store system was twice more than that with open store system implying more efficient degradation of organic matter with open store system. Temperature also influenced on the organic matter degradation in piggery slurry as shown decline in TS and VS contents as the temperature increased. With store at 35℃, 29% of initial organic matter was reduced while there was only 23% reduction of organic matter at 20℃. There was no difference in the type of organic fatty acids(VFAs) produced under the range of temperature(20, 35℃) simulating summer condition. Increases in organic fatty acids contents with hydrolysis and acid producing microbial was observed from 15 days after initiating store of the piggery slurry and the total organic acid amount produced 30 days after store was 2,829 mg·COD/L and 9,123 mg·COD/L at 20℃ and 35℃, respectively. These corresponded to 5.4% and 17.4% of the initial organic matter contents in piggery slurry, respectively.
농업부문 온실가스 감축기술 우선순위 평가를 위한 다중속성 분석
박우균 ( Woo Kyun Park ),김건엽 ( Gun Yeob Kim ),이선일 ( Sun Il Lee ),이상호 ( Sang Ho Lee ) 한국축산경영학회,농업정책학회(구 한국축산경영학회) 2015 농업경영정책연구 Vol.42 No.3
The study aimed to analyze multi-attributes for GHGs mitigation technology in agricultural sectors. The technology classified to four great factors, which economic, technologic, environmental, and institution factors. Again, it was subdivided into 12 attributes which have both positive and negative impacts. This study analyzed the data using the Analytic Hierarchy Process (AHP) based on the expert’s opinion polls. The overall results showed that economic factor was main factor for GHGs mitigation technology in agricultural sectors. the next factor followed by environmental, technologic, and institution factors for GHGs mitigation technology in agricultural sectors. Also, the experts made much importance of fixed cost of technology for GHGs mitigation.