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- 저자 : 나경주 ( Kyeong-ju Na ) (검색결과 2 건)
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포기조에서 산기관의 설치위치가 용존산소에 미치는 영향 연구
나경주 ( Kyeong-ju Na ),박혜윤 ( Hye-yun Park ),이채영 ( Chaeyoung Lee ) 한국수처리학회 2021 한국수처리학회지 Vol.29 No.4
Currently, countries worldwide are trying to reduce greenhouse gases, and Korea also attempts to decrease industrial greenhouse gas emissions. Aeration is the most energy-demanding process in a sewage treatment facility. Improvements in the aeration process's efficiency will significantly contribute to national goals and climate change response. We conduct the aeration performance test to derive the optimum conditions for the diffuser arrangement and its installation depth in the aeration tank. The ball-type diffusers are installed at about 1/3 level (900 mm below the water surface) and 2/3 level (1,800 mm below the water level) of the water tank. We observed the change in aeration tank dissolved oxygen (DO) concentration with the blown air volume and time. The average increase in DO concentration ranged from 1.13 mg/L to 1.73 mg/L when aeration was conducted at the middle of the aeration tank. In contrast, the average increase in DO concentration ranged from 0.52 mg/L to 1.04 mg/L when aeration devices were installed at the bottom of the aeration tank. These results indicated that installing diffusers in the middle depth of the aeration tank was more effective for oxygen delivery and power requirement. The average air power required to drive the DO between 0.5 mg/L and 3.0 mg/L for an hour is found as 0.42 kWh and 0.38 kWh for the bottom and middle part of the tank, respectively. The results show 9.5% energy saving for aeration in the middle. The results reveal that the lower the depth of the aeration diffuser installation, the better the oxygen delivery. Therefore, it will be possible to construct an aeration system with better energy efficiency when aeration diffusers are installed at low-water-depths.
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하수처리시설에서 공정별 황화수소와 복합악취 발생 특성 및 상관분석
이길수 ( Kilsoo Lee ),한상집 ( Sangzib Han ),나경주 ( Kyeong-ju Na ),이채영 ( Chaeyoung Lee ) 한국수처리학회 2021 한국수처리학회지 Vol.29 No.6
Although sewage treatment plants play an important role in water purification, odors from the facilities are frequently a source of complaints, eliciting objections from both plant workers and neighbors. Hydrogen sulfide is a natural by-product of anaerobic digestion that has a strong, unpleasant odor. Therefore, many researchers in Korea have attempted to characterize odors emitted by sewage treatment plants in odor to reduce their emissions. However, these researches have primarily focused on odor intensity scales or the measurement of odor compounds in several sites without considering detailed information of the statistical analysis. In this study, using 75th percentile of unit processes as the complex odor, the operations connected with sludge thickening were discovered to be the main emission sources of odorous substances, followed by primary settling, equalization, anaerobic, dewatering, anoxic, preliminary treatment, and aerobic processes. These results will be aid in identifying major odor sources associated with sewage treatment processes and prioritizing an odor control plan. In this study, the possibility of predict complex odor from hydrogen sulfide concentrations was considered when performing correlation and regression analysis. It could be used to define the requirements for installing odor eliminators and establishing odor regulations in sewage treatment plants.
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