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한국수처리학회지 update

Journal of Korea Society of Water Science and Technology

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수록정보
수록범위 : 1권1호(1993)~29권4호(2021) |수록논문 수 : 1,379
한국수처리학회지
29권4호(2021년 08월) 수록논문
최근 권호 논문
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KCI등재

1해수 오존처리시 브로민 생성과 소독효과

저자 : 황태문 ( Tae-mun Hwang ) , 이광희 ( Kwanghee Lee ) , 김유곤 ( Yoogon Kim ) , 정유미 ( Youme Jung ) , 윤여준 ( Yeojoon Yoon )

발행기관 : 한국수처리학회 간행물 : 한국수처리학회지 29권 4호 발행 연도 : 2021 페이지 : pp. 3-10 (8 pages)

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Pathogenic and/or invasive organisms are problematic in ballast water, desalination plants and aquaculture systems for both ecological and economic reasons. In a desalination plant, the presence of microorganisms can lead to biofouling of the ultrafiltration and seawater reverse osmosis membrane equipment. Meanwhile, in the aquaculture industry, some pathogenic organisms cause serious fish diseases, which can result in mass die-offs. Various disinfection techniques such as ozonation, ultraviolet irradiation, electrolysis and chlorination, have been applied to remove pathogenic organisms from seawater environments. The purpose of this study was to develop a kinetic model for the prediction of residual ozone and bromine concentrations in seawater following ozonation, taking into consideration the ozone dose, water salinity, and pH. Ozone chemistry in saltwater is considerably different from that in fresh water because saltwater contains much higher concentrations of dissolved anions and cations (e.g., chloride, bromide, magnesium, sulfate) than fresh water. Salinity greatly affects the formation of residual ozone and bromine during saltwater ozonation. Unlike freshwater ozonation, there is no hydroxyl radical formation in seawater ozonation because ozone decomposition is considerably faster in water containing bromide. Therefore, seawater ozonation involves the initial unstable oxidant (ozone) and a secondary, more stable oxidant (bromine) for disinfection. This study also aimed to evaluate the performance of ozone and bromine disinfection using E. coli. The log inactivation of E. coli with ozone and bromine was 2.5 and 4 log, respectively. The log inactivation of E. coli with seawater ozonation was 5.8 log.

KCI등재

2나노여과를 통한 경도 조정 주조용수의 관능검사 분석 연구

저자 : 김재범 ( Jae Bum Kim ) , 박성혁 ( Sung Hyuk Park )

발행기관 : 한국수처리학회 간행물 : 한국수처리학회지 29권 4호 발행 연도 : 2021 페이지 : pp. 11-19 (9 pages)

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A liquor market is one of the consumers for the water industry. In this study, using groundwater as raw water, waters of various hardness were produced by a nano-filtration process, and a sensory test analysis was performed to determine the range of hardness that best meet the sensory expectations of domestic consumers. According to Korea standard, water samples were investigated using the hedonic scale method for preferences for odor, swallow and taste. ANOVA was performed using the XLSTAT program and Tukey HSD test was performed to determine whether differences were significant. In the sensory test, four criteria were evaluated in the form of a blind test for water at four hardness levels, 0, 10, 35, and 50 mg/L, by 31 panels. It was found that odor did not differ with hardness, whereas there was relatively high preference at the 95% confidence level for water with a hardness of 10 mg/L in categories of swallowing and taste. Through the results of this study, it will be possible to prepare the basis for the development of differentiated alcoholic beverage products that meet consumer satisfaction.

KCI등재

3포기조에서 산기관의 설치위치가 용존산소에 미치는 영향 연구

저자 : 나경주 ( Kyeong-ju Na ) , 박혜윤 ( Hye-yun Park ) , 이채영 ( Chaeyoung Lee )

발행기관 : 한국수처리학회 간행물 : 한국수처리학회지 29권 4호 발행 연도 : 2021 페이지 : pp. 21-28 (8 pages)

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Currently, countries worldwide are trying to reduce greenhouse gases, and Korea also attempts to decrease industrial greenhouse gas emissions. Aeration is the most energy-demanding process in a sewage treatment facility. Improvements in the aeration process's efficiency will significantly contribute to national goals and climate change response. We conduct the aeration performance test to derive the optimum conditions for the diffuser arrangement and its installation depth in the aeration tank. The ball-type diffusers are installed at about 1/3 level (900 mm below the water surface) and 2/3 level (1,800 mm below the water level) of the water tank. We observed the change in aeration tank dissolved oxygen (DO) concentration with the blown air volume and time. The average increase in DO concentration ranged from 1.13 mg/L to 1.73 mg/L when aeration was conducted at the middle of the aeration tank. In contrast, the average increase in DO concentration ranged from 0.52 mg/L to 1.04 mg/L when aeration devices were installed at the bottom of the aeration tank. These results indicated that installing diffusers in the middle depth of the aeration tank was more effective for oxygen delivery and power requirement. The average air power required to drive the DO between 0.5 mg/L and 3.0 mg/L for an hour is found as 0.42 kWh and 0.38 kWh for the bottom and middle part of the tank, respectively. The results show 9.5% energy saving for aeration in the middle. The results reveal that the lower the depth of the aeration diffuser installation, the better the oxygen delivery. Therefore, it will be possible to construct an aeration system with better energy efficiency when aeration diffusers are installed at low-water-depths.

KCI등재

4온도에 따른 코발트 함유 폐수의 침전 처리 특성 기초 연구

저자 : 송혜원 ( Hyewon Song ) , 김동수 ( Dong-su Kim )

발행기관 : 한국수처리학회 간행물 : 한국수처리학회지 29권 4호 발행 연도 : 2021 페이지 : pp. 29-35 (7 pages)

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The influences of temperature and hydrogen ion concentration on wastewater containing cobalt ions were investigated by constructing Pourbaix diagrams for the Co0-H2O system at temperatures of 288, 298, 308, and 318 K with varying pH levels. The majority of cobalt in water has been observed to exist in the form of Co2+ ions. Co0 and Co2+ are mutually interchangeable in acidic conditions depending on the reduction potential. Here, the conversion of Co2+ to Co(OH)2 and to Co(OH)3 was observed when pH was increased to around pH 5.5 to 6.5; the pH at which the change occurred decreased as the temperature increased. The changes in reactivity between the chemical species Co0, Co2+, Co(OH)2, and Co(OH)3 were quantified by measuring the area of stable conditions in the Pourbaix diagrams. The ratios of stable regions between Co(OH)3/Co2+, Co(OH)2/Co2+, Co0/Co2+, Co(OH)2/Co0, and Co(OH)2/Co(OH)3 were observed to increase as the temperature increases. Therefore, the reactivity between these species was considered to in crease with temperature. These results indicate that it is necessary to consider the effect of temperature for the effective treatment of wastewater that contains cobaltions.

KCI등재

5혐기성 공동소화 공정에서 커피찌꺼기 산 발효액이 바이오가스 생산에 미치는 영향

저자 : 최희정 ( Hee-jeong Choi )

발행기관 : 한국수처리학회 간행물 : 한국수처리학회지 29권 4호 발행 연도 : 2021 페이지 : pp. 37-45 (9 pages)

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The spent coffee grounds (SCG) were acidogenic fermented and it used as a co-feedstock in the anaerobic co-digestion process. After mixing sewage sludge and acidogenic fermented SCG in a ratio of 7:3 (SF2), the effect on biogas production was observed. The cumulative biogas production during 30-day digestion time was determined 705.28 mL for SF1 (only sewage sludge) and 1891.98 mL for SF2, indicating that SF2 produced about 2.68 fold more cumulative biogas. The methane content in produced biogas was determined 62-65% and 70-73% for SF1 and SF2, respectively. Moreover, the specific biogas production was found to be 0.35 ± 0.11 mL/kg·TS and 0.43 ± 0.13 mL/kg·VS for SF1 and 0.64 ± 0.15 mL/kg·TS and 0.81 ± 0.16 mL/kg·VS for SF2. In addition, the calculated energy production was 2.76 kWh for SF1 and 5.82 kWh for SF2, indicating about 2.1 fold higher energy production than that of SF1. Finally, the co-digestion performance index was 1.69 for SF2, so it was confirmed that the synergistic effect for biogas production was high when anaerobic co-digestion using FSCG as a co-feedstock.

KCI등재

6홍수조절지를 이용한 비홍수기의 영산강 수질개선효과

저자 : 김정수 ( Jeong Soo Kim ) , 박성천 ( Sung Chun Park ) , 박수호 ( Soo Ho Park ) , 이우범 ( Woo Bum Lee )

발행기관 : 한국수처리학회 간행물 : 한국수처리학회지 29권 4호 발행 연도 : 2021 페이지 : pp. 47-59 (13 pages)

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Yeongsan River basin turned into a relatively safe basin from flooding by heightening of agricultural reservoir dams, construction/expansion of washlands, Detention reservoirs and estuary barriers through the Four Major River Project. However, the Yeongsan River still shows the worst water quality in Korea. The river has two detention reservoirs in operation. It is possible to improve the water quality of the river if the reservoirs can retain water during non-flooding seasons and utilize the water as dilution water. Therefore, the present study selected the Environmental Fluid Dynamics Code (EFDC) and built a model to analyze the effect of water quality improvement in the reach with the length of 98 km from the Geumwol bridge located upstream to the immediate upstream of the Juksan weir located downstream in the river. 27 scenarios were created according to freshwater storage rate and discharge volume of the detention reservoirs. The effects of water quality improvement were analyzed using TOC and TP in the Naju station that is the representative one in the Yeongsan River. The results reveal that the effects of water quality improvement are 2.0 - 16.8 % and 10.1 - 22.8 % for TOC and TP, respectively, and last 0.43 - 6.94 days. The present study proposes implementing projects to improve the water quality in the river after establishing an optimized utilization plan for the detention reservoirs based on verification of the effects through a pilot run.

KCI등재

7LTE-M1 센서를 이용한 상수도관 누수감지 신호 특성 연구

저자 : 오병근 ( Oh Byoung Geun )

발행기관 : 한국수처리학회 간행물 : 한국수처리학회지 29권 4호 발행 연도 : 2021 페이지 : pp. 61-68 (8 pages)

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In this study, the frequency and shape characteristics of the sounds of leaks in water pipes were analyzed using an LTE-M1 sensor. We verified the relevance through frequency analysis and cross correlation analysis of the leakage signals for metal(STS) pipes and PE pipes. By processing the leakage signal detected by the sensor to determine the frequency bandwidth from 0 ~ 5120 Hz, it was found that the leak signal is strongest in the range of 200 ~ 400 Hz. Therefore, the specific frequency range of the leak sound was confirmed from 200 to 400 Hz. The intensity was attenuated with increasing distance from the leakage point. When comparing to the metal pipe and the PE pipe, the range of the frequency did not differ much, but the intensity of the frequency signal in the metal pipe was relatively high. The leak-detecting frequency band in which the leak occurs in pipes indicated that the strength of the leak signal weakens as it moves away from the leak point. These studies can be used as basic data to analyze the frequency characteristics of leaks and apply them to future technologies such as artificial intelligence, big data, IoT, and 5G to find leak points.

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