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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.
이복진 ( Bokjin Lee ),오혜철 ( Hye-cheol Oh ),안재환 ( Jae-hwan Ahn ),김영민 ( Youngmin Kim ),강희준 ( Heejun Kang ),김석구 ( Seog-ku Kim ) 한국수처리학회 2018 한국수처리학회지 Vol.26 No.2
As an eco-friendly substitute to commercial coagulants, the Mineralized Coagulant was produced and its algae and nutrient control efficiencies were evaluated. The raw water of a reservoir (chlorophyll-a = 48.0 mg/㎥, total organic carbon = 95.3 mg/L) was treated with the mineralized coagulant and other commercial coagulants. After the coagulation, monthly analyses of chlorophyll-a, organic matters, and nutrient concentrations were performed twice. The mineralized coagulant showed 96% of chlorophyll-a and 94% of total organic matter removal efficiency while the range of all coagulants were 75% to 99% and 50% to 96%, respectively. For the nutrient, the mineralized coagulant showed the higher removal efficiency (83% for total nitrogen and 93% for total phosphorus) and the lower release from the coagulated algae than most of other coagulants.
G시 하수처리장의 미세플라스틱 함유량 특성과 배출량 추정
강희준 ( Heejun Kang ),박새롬 ( Saerom Park ),이복진 ( Bokjin Lee ),윤상린 ( Sanglyn Yoon ),오혜철 ( Hyecheol Oh ),안재환 ( Jaehwan Ahn ),김석구 ( Seog-ku Kim ) 한국수처리학회 2020 한국수처리학회지 Vol.28 No.4
Microplastics (MP) are small plastic particles in the environment. MP are plastics smaller than 5 mm and main sources are from cosmetic products, laundry, industrial processes and sewage treatment plant. MP that generated from use of people mainly enter sewage treatment plants. Although MP were removed from the final effluent more than 90%, large amount of MP are flow into the sewage treatment plant, lots of untreated MP is being discharged into the water environment. MP entering the water environment adversely affect the ecosystem due to adsorbed persistent organic pollutants (POPs) substances in MP and chemical susbstance added during plastic production. In order to confirm sewage treatment recudtion rate in G city, each sewage treatment process and sludge were analyzed quantitatively and qualitatively and estimate the amount of microplastics flow out into the environment. As a result of the analysis, 595.4 MP/L in sewage influent and 13.1 MP/L in the final effluent and the reduction efficiency was 97.8%. Microplastics contained in the final sludge were 70,571 MP/kg. Untreated microplastics from sewage treatment plant flowing into the river is 2,371 million per day, and it is possible to 811,566,500 microplastics were recycled to fertilizer, it can be leaked into the soil.