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윤영한,임현만,김원재,정진홍,박재로,Yoon, Younghan,Lim, Hyun Man,Kim, Weon Jae,Jung, Jin Hong,Park, Jae-Roh 응용생태공학회 2016 Ecology and resilient infrastructure Vol.3 No.4
유속이 낮은 정체수역에 대하여 부영양화에 의한 녹조발생을 미연에 방지하고 수질개선을 도모하기 위하여 기존 인공식물섬 운영기술에 다양한 요소기술을 도입한 다기능 인공식물섬을 개발하였고 개발기술에 대한 성능검증을 위하여 경기도에 소재하는 하천에서 여름철과 겨울철 동안에 모니터링 하였다. 본 연구의 다기능 인공식물섬은 수질정화 기능을 높이기 위해서 정수식물 기반의 식생여과 공정 위주의 일반 인공식물섬 기술에 미세기포 공정과 인공여재에 의한 인 흡착/여과 공정을 추가하여 운영하였다. 개발기술에 대한 계절에 따른 오염물질 (COD, T-P) 제거율 변화로부터 오염부하가 낮은 겨울철 (15.9%, 20.0%)보다는 부하가 높은 여름철 (40.9%, 45.7%)에 높은 처리효율을 갖는 것으로 나타났고 공정별 제거율 (SS, Chl-a)에서는 미세기포 공정은 여름철 (33.1%, 39.2%)에, 인 흡착/여과 인공여재 및 식생여과 공정은 겨울철 (76.5%, 59.5%)에 높은 제거효율을 갖는 것으로 분석되어 다기능 인공식물섬의 정화능은 계절별 변화 또는 오염부하 정도에 따라서 적용 기술별로 제거능을 나타내어 지속적인 모니터링이 필요할 것으로 사료되었다. 또한, 인공식물섬 주변의 생태변화 분석결과, 식물섬 저부에 미세기포의 공급으로 용존산소가 증가됨으로써 혐기화에 의한 물질환원 현상을 방지하고 수류순환을 유도하여 친환경적인 새로운 수생태계가 조성되는 것을 확인하였고 이러한 결과들을 통하여 다기능 인공식물섬에 의하여 정체수역의 수질이 개선되고 다양한 동식물의 성장으로 정체수역 저부의 물질순환이 개선될 수 있는 가능성을 확인하였다. Multi-functional floating wetland island (mFWI) was developed in order to prevent algal bloom and to improve water quality through several unit purification processes. A test bed was applied in the stagnant watershed in an urban area, from the summer to the winter season. For the advanced treatment, an artificial phosphorus adsorption/filtration medium was applied with micro-bubble generation, as well as water plants for nutrient removal. It appeared that the efficiency of chemical oxygen demand (COD) and total phosphorus (T-P) removal was higher in the warmer season (40.9%, 45.7%) than in the winter (15.9%, 20.0%), and the removal performance (suspended solid, chlorophyll a) in each process differs according to seasonal variation; micro-bubble performed better (33.1%, 39.2%) in the summer, and the P adsorption/filtration and water plants performed better (76.5%, 59.5%) in the winter season. From the results, it was understood that the mFWI performance was dependent upon the pollutant loads in different seasons and unit processes, and thus it requires continuous monitoring under various conditions to evaluate the functions. In addition, micro-bubbles helped prevent the formation of anaerobic zones in the lower part of the floating wetland. This resulted in the water circulation to form a new healthy aquatic ecosystem in the surrounding environment, which confirmed the positive influence of mFWI.
천연조류제거제를 활용한 응집·부상 전처리공정의 기존 응집공정 대체 가능성
장여주,정진홍,임현만,장향연,김원재,Jang, Yeo-Ju,Jung, Jin-Hong,Lim, Hyun-Man,Chang, Hyang-Youn,Kim, Weon-Jae 대한상하수도학회 2017 상하수도학회지 Vol.31 No.1
In the coagulation/sedimentation (C/S) process of the water treatment process, the inflow of massive algal bloom causes many problems including fouling of filter media. This study was conducted to find out the way to remove the algae's harmful effects by addition of pre-treatment prior to C/S process. Many Jar-tests were conducted such as (1) ACF (Algae Coagulation Flotation) process using natural algae coagulant (Water $Health^{(R)}$), (2) ACF + C/S process and (3) C/S process with a variety of conditions using cultured algae. The average values of turbidity were (1) 0.42 NTU for ACF process, (2) 0.13 NTU for ACF + C/S process and (3) 0.25 NTU for C/S process. It was shown that the treatment efficiency of ACF process could get low turbidity results, and ACF + C/S process could achieve more efficient results than those of C/S process. Any negative effects of ACF process to the efficiency of C/S process were not observed in ACF + C/S process. In order to reduce the unfavorable effects of algae, it was found out that the introduction of ACF process in the forms of (1) ACF or (2) ACF + C/S could be one of the effective and alternative solutions.
( Miratul Maghfiroh ),임현만 ( Lim Hyun-man ),안광호 ( Ahn Kwang-ho ),정진홍 ( Jung Jin-hung ),장여주 ( Jang Yeo-ju ),장향연 ( Chang Hyang-yeon ),박나리 ( Park Na-ri ),김원재 ( Kim Weon-jae ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
Water shortage becomes apparent threat whereby millions of people in the world are estimated to have experienced it even for a year-round. Recycling, reusing and reclaiming wastewater are among countermeasures to wisely utilize water in the future. Natural zeolites cater capabilities to recover polluted water. Zeolites act as ion exchangers by which favorable ions are adsorbed into active sites in the zeolite frameworks in exchange to ions with less affinity. These materials are also comparatively inexpensive and low-energy cost in maintenance especially for up-scale practices. We studied the performance of Korean domestic natural zeolites through column tests by analyzing breakthrough curves and evaluated the data according to Adam-Bohart and Thomas models. This study benefits to gain insights on appropriate design parameters for pilot scale in the future. Based on XRD analysis, our natural zeolites contain heulandite, clinoptilolite, mordenite, and quartz. It was also revealed that silica was 74.3% and aluminum compound was 14.6%. Column tests were carried out in a continuos flow with synthetic ammonium solutions of 50 mg/L as the influent. Bed height was 27.5 cm and particle sizes of zeolites were 1.18-2.36 mm. Two vertical velocities (5 m/h and 2.5 m/h) were chosen in this study. Observations of ammonium concentrations were monitored at certain times until breakthrough was reached around 50%. According to the curves, breakthrough of 0.05 Ct/C0 was achieved after 1.7 hours and 5.6 hours when using 5 m/h and 2.5 m/h vertical velocity correspondingly. We also challenged our experimental data against two common models for sorption in packed bed i.e. Adam-Bohart and Thomas models using non-linear regression approaches. We found that Thomas model fitted the experimental data well showing R<sup>2</sup>>0.92 with SSE<0.04. Adam-Bohart model explained mass balance of sorption process while Thomas model assumes that the reactions in packed bed are reversible.
( Miratul Maghfiroh ),임현만 ( Lim Hyun-man ),안광호 ( Ahn Kwang-ho ),정진홍 ( Jung Jin-hung ),장여주 ( Jang Yeo-ju ),장향연 ( Chang Hyang-yeon ),박나리 ( Park Na-ri ),김원재 ( Kim Weon-jae ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
Water shortage becomes apparent threat whereby millions of people in the world are estimated to have experienced it even for a year-round. Recycling, reusing and reclaiming wastewater are among countermeasures to wisely utilize water in the future. Natural zeolites cater capabilities to recover polluted water. Zeolites act as ion exchangers by which favorable ions are adsorbed into active sites in the zeolite frameworks in exchange to ions with less affinity. These materials are also comparatively inexpensive and low-energy cost in maintenance especially for up-scale practices. We studied the performance of Korean domestic natural zeolites through column tests by analyzing breakthrough curves and evaluated the data according to Adam-Bohart and Thomas models. This study benefits to gain insights on appropriate design parameters for pilot scale in the future. Based on XRD analysis, our natural zeolites contain heulandite, clinoptilolite, mordenite, and quartz. It was also revealed that silica was 74.3% and aluminum compound was 14.6%. Column tests were carried out in a continuos flow with synthetic ammonium solutions of 50 mg/L as the influent. Bed height was 27.5 cm and particle sizes of zeolites were 1.18-2.36 mm. Two vertical velocities (5 m/h and 2.5 m/h) were chosen in this study. Observations of ammonium concentrations were monitored at certain times until breakthrough was reached around 50%. According to the curves, breakthrough of 0.05 Ct/C0 was achieved after 1.7 hours and 5.6 hours when using 5 m/h and 2.5 m/h vertical velocity correspondingly. We also challenged our experimental data against two common models for sorption in packed bed i.e. Adam-Bohart and Thomas models using non-linear regression approaches. We found that Thomas model fitted the experimental data well showing R<sup>2</sup>>0.92 with SSE<0.04. Adam-Bohart model explained mass balance of sorption process while Thomas model assumes that the reactions in packed bed are reversible.
하천정화를 위한 상향류식 접촉산화공법의 운전특성에 관한 연구
박재로(Jae Roh Park),임현만(Hyun Man Lim),우효섭(Hyo Seop Woo) 한국물환경학회 2001 한국물환경학회지 Vol.17 No.5
This study applies to the Upflow contact oxidation Process for river purification. The ability of the plant to treat polluted stream water was determined and a suitable operating conditions were deduced. This study also presents a plan for effective use and operation maintenance. The results from the treatment efficiency from the Upflow contact oxidation method showed that the removal of BOD and SS depends more on the existence of aeration rather than treatment time. The best removal was seen at 2 hours retention time, and the presence of aeration proved to be twice as effective compared to the absence of aeration. The application of the Demo Plant in the field indicated a decrease in the inflow and outflow concentrations of BOD from 8.2㎎/ℓ to 4.3㎎/ℓ. The average removal percentage was 38%. However, at the 1.9 hour point of the 2 hour retention time, a maximum removal rate of 50.7% was seen. Also, if the operation were continued for 200 days, the pore is reduced 3.14% and backwash will be needed two times per year.