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슬러지에서 제조한 TiO<sub>2</sub>와 시멘트가 혼합된 시편의 유기염료 제거효율 평가
여우석 ( Wooseok Yeo ),김종규 ( Jong Kyu Kim ) 한국수처리학회(구 한국수처리기술연구회) 2020 한국수처리학회지 Vol.28 No.4
This study investigates the photocatalytic decomposition of Methylene Blue (MB) under sunlight (ultraviolet light) by titanium dioxide produced from sludge called (TFS) compared to the widely used titanium dioxide (P-25). For the experiment, three types of specimen were prepared: 1) cement, 2) cement mixed with TiO<sub>2</sub> (P-25) and 3) cement mixed with TFS; and two types of cement were tested for the cement materials: Type 1 normal Portland cement and Ultra rapid hardening cement. The removal rate of MB was identical as 99.2% for TFS and P-25 when Type 1 normal Portland cement was used. However, the removal rates differed as 92% for TFS and 98% for P-25 when Ultra rapid hardening cement was applied. This result shows that TFS possess the photocatalytic efficiency similar to that of P-25. When TFS was mixed as a catalyst, the MB removal rate was increased when Type 1 normal Portland cement was used as a binder compared to when Ultra raid hardening cement was applied. The optimal condition for the synthesis of TFS with Type1 normal Portland cement was determined as mixing ratio of 27.079% with the reaction time of 118.186 minutes. Therefore, it can be concluded that TFS could potentially be applied as a photocatalyst in the field as it shows similar photocatalytic activities of P-25 under ambient sunlight (ultraviolet).
수중의 세슘 제거를 위한 강자성체 프러시안 블루 복합체(FPC) 제조
여우석 ( Wooseok Yeo ),김종규 ( Jong Kyu Kim ) 한국수처리학회(구 한국수처리기술연구회) 2018 한국수처리학회지 Vol.26 No.4
Among the various radioactive materials, Cesium is a major source of radioactive contamination and known to be the most dangerous radioactive material, can cause enormous damage to the ecosystem environment when released into the environment. Prussian Blue has been used as an adsorbent to effectively remove cesium, however it has the problem of being difficult to separate in water. In this study, carbonyl iron(CI) which is known as ferromagnetic synthesized with PB to solve the problem of PB particles. CI was used as a support of Ferromanetic Prussian blue Composite (FPC) and FPC can remove the cesium in water and be easily separated by self-separation phenomenon. The optimal cesium removal efficiency was confirmed under the injection conditions of 60g of CI particles through experiments to find the optimal mixing ratio of CI particles and PB. The removal rate of cesium was 95.4%. The FPC prepared through this study has excellent cesium removal capacity, and it can be completely separated from water when used directly in the cesium treatment field.
실시간 활성 슬러지 플랜트 제어기를 이용한 산소 섭취율 및 암모늄에 의한 하폐수처리장 최적화, 에너지 소비량 절감 및 방류 규정 준수
김종규 ( Kim Jong Kyu ),여우석 ( Yeo Wooseok ),이재미 ( Lee Jae Mee ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
Recently, the optimization of wastewater treatment plants (WWTPs) has been getting global attention to achieve sustainable energy and the water cycle. In an activated sludge applied WWTPs, the blower system in the aeration tank accounts for 30-70% of the electricity cost and CO<sub>2</sub> emission. This experiment is conducted to suggest a feasible optimization strategy by controlling blower pressure and dissolved oxygen (DO) setpoints based on the real-time measurement of Oxygen Uptake Rate (OUR) and Ammonium. OUR which represents the total biodegradable load, and ammonium which indicates the level of nitrification can be combined to analyze the optimal setpoints of the blower and the DO levels. Real-time monitoring equipment (Strathkelvin Instruments) was installed in the anoxic zone of Seonam WWTPs for 6 weeks to assess the potential energy and cost savings. The required oxygen level in each zone of aeration lanes is analyzed by OUR and Ammonium values. The result obtained data concluded that 20% of the energy-saving - approximately equivalent to ₩1,720,000,000 per year - is feasible by analyzing the times that the blower pressure can be lowered, for instance, the times that the treatment is completed but the excessive blower is running to supply DO. While designing a control strategy, the OUR value was crucial in determining the DO set points and blower pressure as it helps to confirm whether the treatment is completed or not in real-time. Although many trials to achieve optimization in WWTPs could not result in success in reality ASP-Con proved that its efficiency and practicability. Therefore, the use of OUR in combination with Ammonia and DO is a feasible technique to apply in diverse WWTPs using activated sludge to reduce energy consumption and costs.
정우창 ( Woochang Jeong ),여우석 ( Wooseok Yeo ),이병락 ( Beong Rak Lee ),김종규 ( Jong Kyu Kim ) 한국수처리학회(구 한국수처리기술연구회) 2017 한국수처리학회지 Vol.25 No.5
Cesium-137 is one of the most dangerous and ubiquitous radionuclides that has been released to the eco system and human being. Many treatment methods have been used to remove cesium particles, such as adsorption, ion exchange, filtration, coagulation and precipitation. Recently, various studies have been carried out using Prussian blue which has a high adsorption effect not only in the eco system but also on the removal of cesium absorbed in the human body. However, despite the excellent effect of removing cesium, Prussian blue has a disadvantage in separation and reuse due to its difficulty in recovering from water because of its high water-solubility characteristics. In order to overcome this disadvantage, a post-treatment process such as a separate filtration process or a secondary adsorption process is required, which is not efficient in terms of environmental and economic aspects. Recently, a research study combining a magnetic materials and Prussian blue showed that cesium particles in water were effectively removed. However, when the external magnetic field is present, the recovery rate is kept high, but the recovery rate is decreased due to the inability to magnetize itself. Therefore, if a super magnetic material having a magnetic force higher than that of a conventional magnetic material and a ferromagnetic material magnetizing itself after application of an external magnetic field are actively studied, it will be possible to effectively remove cesium from the water in an environmentally friendly and economical way.