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더블 빔 구조, 다파장 분석을 적용한 연속식 실시간 COD 측정 센서 개발
이준석 ( Joon Seok Lee ),신대정 ( Dae Jung Shin ),형기우 ( Gi Woo Hyoung ),류인재 ( In Jae Ryu ) 한국센서학회 2014 센서학회지 Vol.23 No.4
At present, the index of chemical oxygen demand (COD) is widely used as an indicator of organic water pollution with biochemical oxygen demand (BOD). But, traditional COD measurement method are not only with various chemical reagents exhausted, but also long time consumed, the operation procedure and the modification are much professional. This paper reported a novel COD measurement system using double-beam and multiple wavelength analysis UV-VIS spectrometries. It consists of pulsed xenon lamp, two way optical fiber, optical switch, spectrometer and main processor. Proposed COD measurement system obtains any spectral information of water sample (KHP standard sample and two river water and wastewater) and reference sample (distilled water) in the range of 200~520 nm, corresponding to the COD concentration from 0 to 300 mg/L through calculating the UV absorbance. The system show improved precision and can work continuously fast at time interval about 25 seconds.
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조일규 ( Il Kyu Cho ),이종현 ( Jong Hyun Lee ),조우영 ( Woo Young Cho ),홍성준 ( Sung-jun Hong ),형기우 ( Gi-woo Hyoung ) 한국환경농학회 2023 한국환경농학회 학술대회집 Vol.2023 No.0
Golden apple snails have been utilized since 1992 in Korea to control weed growth in rice fields, exploiting their feeding behaviors. However, these snails have recently begun overwintering in the southern parts of Korea due to climate change, causing harm. In 2007, the Ministry of Environment categorized the golden apple snails as a second-class organism for ecological control. This study aims to develop an efficient trapping technique employing baited traps to eradicate the snails released into the surrounding ecosystems. The experiments were conducted in rice fields, agricultural reservoirs and freshwater lakes. The findings revealed that larger traps attracted more snails in small streams and lakes, although their effectiveness in rice fields and lakes was limited. Comparing various trap types, shrimp nets outperformed funnel traps in capturing golden apple snails, including a significant number measuring over 1 cm. Papaya leaves proved to be the most effective attractant for both shrimp nets and funnel traps, followed by potatoes, menthol-containing fish bait and papaya fruit. In the cultivation environment experiments, large funnel traps with papaya leaves captured 192 snails in 7 days, while traps with potatoes only caught 101 snails. This indicates that papaya leaves had roughly double the attraction effect compared to potatoes. However, the attraction effect decreased when focusing on snail capture in rice fields, their natural habitat, compared to experiments conducted in other areas. In the subsequent year, after applying pesticides to the snails on April 24, 2023, baited traps were installed on May 3, and after 6 days, on May 9, increased attraction was observed in large funnel traps with potatoes, melons, watermelons, papaya leaves and oriental melons. The results recommend installing large funnel traps in rice fields, agricultural reservoirs, drainage channels, and suitable locations, emphasizing snail capture and removal methods. Potatoes, melons and watermelons are recommended as attractants due to their ease of use for farmers.
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