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윤상린 ( Yun Sang Leen ),김동하 ( Dong Ha Kim ),이영규 ( Young Kyu Rhee ) 한국물환경학회 2002 한국물환경학회지 Vol.18 No.2
Abundant growth of algae in raw water sources caused by eutrophication brings about significant side effects on water supply, such as taste and order problem, oxygen depletion, toxic material secretion, and filter clogging problem in water treatment process, etc. The purpose of this research is to remove the algae and phosphorus compounds in the Pal-dang reservoir promptly by using the upflow filtration system with coagulant addition. The filter tower consisted of sand media and sieve filter with air back-washing process. By using coagulation and filtration with 132㎛ pore size filter, about 55% and 70% of algae and phosphorus compounds were removed respectively. The experimental conditions were as follows; head loss of 0.2m, linear velocity of 200m/day, and filtration flux of 1000(L/㎡/day). In the case of filtration with cartridge type filter of 25㎛ pore size, the filtration flux was about 7800 LMH, and the removal ratios of COD, SS, T-P, and Chlo-a. were 61%, 99%, 54%, and 98%, respectively. However, high pressure air back-washing process with should be required for the maintenance of such high filtration flux.
Membrane Fouling에 미치는 용존성 유기물의 영향과 그 제어에 관한 연구
윤상린 ( Yun Sang Lin ),김동하 ( Kim Dong Ha ),지덕기 ( Ji Deog Gi ),이상욱 ( Lee Sang Ug ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.3
The coupling of an activated sludge reactor with a membrane unit (Membrane Bioreactor system) offers several advantages over conventional process. But the major disadvantage of this process in the extensive use is the continuous reduction of permeation flux caused by membrane fouling. The aim of this study is to investigate membrane fouling characteristics caused by the soluble organic materials in the membrane bioreactor System process. For the removal of the filterable organic materiais(FOC) less than 1㎛, coagulants and activated carbon were added. Gravity filtration and filtration under the pressure of 206kPa were conducted in the experiments. The rate of filtration flux increased abruptly with the decrease of FOC concentration. The flux with FOC 1.2㎎/l showed the 4.3 times higher compared to the results of FOC 3.7㎎/l. After addition of granular activated carbon (15min) and sedimentation (20min) of raw water 18% of FOC were removed while 54% and 67% of FOC were removed when 400㎎/l and 500㎎/l of PAC were added, respectively. From these results. PAC is superior in the FOC removal than GAC. By the addition of PAC after the coagulation reaction. more than 90% of organic particles less than 0.1㎛ was removed and the flux became 290 times faster than that of no treated water. This study showed that PAC addition after the coagulation reaction is the most elfective process to prevent membrane fouling problems.
김석구 ( Seog Gu Kim ),윤상린 ( Sang Leen Yun ),김영임 ( Young Im Kim ),이용재 ( Yong Jae Lee ),김이호 ( Ree Ho Kim ),김종오 ( Jong Oh Kim ) 한국물환경학회 2004 한국물환경학회지 Vol.20 No.5
While more attention has been paid in recent years to urban point source pollution control, no considerable measures have been taken to control urban non-point source pollution. Contaminants from non-point sources deposited on urban impermeable surfaces such as road and highway are easily released to the public waters by rainfall, leading to the deterioration in water quality in urban area. The present study investigated a system using filter media to reduce the level of contamination in urban road runoff. Three different media, designated as J-P (polypropylene, blowing type), B-P (polypropylene, fiber type), and P-F (Polyvinyl alcohol, cube and sheet type) were evaluated on the basis of pollutant removal efficiency as well as hydraulic property. Experiments were peformed using a 1/4-scale treatment unit at various pollutant roading and rainfall intensity with real rainwater runoff collected from road surfaces. The results at different rainfall intensities shows that the medium J-P is superior to the other media for water permeability. J-P was not blocked at 10 ㎜/hr rainfall and its permeability was stable. On the other hand, B-P and P-F resulted in substantial overflow ratio even at l ㎜/hr rainfall intensity. Comparing treatment efficiencies for suspended solids, all media showed similar removal ranged from 91% to 95%. However, J-P seems to be better than the other media considering its higher water permeability. J-P and P-F, both hydrophobic, yielded over 76% of heavy metal removal. But, the hydrophilic media B-P showed much smaller removal ranging from 26% to 47%. This indicates that J-P and P-F are beneficial to remove heavy metal due to their hydrophobic property. The treatment efficiencies over PAHs (poly aromatic hydrocarbons) showed the similar removal efficiency ranging from 66% to 97% for all three media.
천연 무기 응집제와 미세기포를 이용한 녹조 제어에서의 수질 변화
이복진 ( Bokjin Lee ),윤상린 ( Sang-leen Yun ),김석구 ( Seog-ku Kim ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
The occurrences of rapid and excessive growth of algae, harmful algal blooms (HABs), have been reported all around the world. A number of technologies have been developed to control HABs and one of the common approach is applying coagulants to settle or float algal cells and removed them from water. However, coagulants themselves can induce environmental concerns like affecting pH and alkalinity. Therefore, it is important to monitor water quality changes after their application. This research presents how a natural inorganic coagulant and microbubbles can be used to control harmful algal blooms in fresh water bodies and the changes in water qualities. To evaluate the performance of the natural inorganic coagulant, raw water (50 ug/L of chlorophyll-a) was sampled from A reservoir in Gyeong-gi province in August when the reservoir was experiencing severe HABs. Jar test was conducted to determine the optimum dosage (2 ml/L), then the coagulant was added to two test columns filled with raw water and mixed thoroughly. Then, microbubbles were injected for a minute to float the algal cells and the algal scum was removed from only one column while the other was remained in the column. Turbidity, chlorophyll-a, total phosphorus, total nitrogen, and microcystin values from supernatant of two columns were analyzed daily for 16 days. The flocs were well flocculated throughout the experiment period. Total nitrogen concentrations from the scum remaining column were higher than the scum removed column which indicates nitrogen release from algal cells. The highlight of this research is that microcystin was not detected from the scum removed column while the sam value from the other column was keep increasing up to 1 ug/L. The results from this research suggests a healthier approach in controlling HABs by using coagulant and microbubbles to remove algal cells from water, in order to prevent further eutrophication and water pollution.