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대한상하수도학회> 상하수도학회지> 초음파와 자외선(UV) 동시 적용이 가정용 가습기 내 살균에 미치는 시너지 효과에 대한 반응속도론적 연구

KCI등재

초음파와 자외선(UV) 동시 적용이 가정용 가습기 내 살균에 미치는 시너지 효과에 대한 반응속도론적 연구

Kinetic examination on synergistic effect of co-use of ultrasonic wave and ultraviolet radiation on bacterial disinfection in a household humidifier

김성아 ( Seunga Kim ) , 김지현 ( Jihyun Kim ) , 이민주 ( Minjoo Lee ) , 김자연 ( Jayun Kim ) , 정우식 ( Woosik Jung ) , 박준홍 ( Joonhong Park )
  • : 대한상하수도학회
  • : 상하수도학회지 35권3호
  • : 연속간행물
  • : 2021년 06월
  • : 227-235(9pages)
상하수도학회지

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1. 서 론
2. 재료 및 실험 방법
3. 결 과
4. 결 론
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References

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This study examined the effect of ultraviolet (UV) application on bacterial disinfection in a commercialized humidifier using ultrasonic wave (UW). To accurately examine disinfection kinetics in tap-water condition, tap-water was sterilized using a filter, and then inoculated with pure cultures of E. coli and P. putida with known viable counts. The disinfection kinetic characteristics were experimentally compared when UV alone, UW alone, and UW+UV together were applied in disinfecting the added bacteria in the commercialized humidifier. When UV alone was applied, bacterial disinfection kinetics followed a first-order decay reaction, and showed an approximately 10-time weaker disinfection compared to the typical UV disinfection in water treatment or wastewater treatment. When UW alone was applied, bacterial disinfection kinetics followed a second-order decay reaction with a low disinfection rate constant of 0.0002 min-1(CFU/mL)-1. When UV and UW were applied together, however and interestingly, the disinfection rate constant (0.0211 min-1(CFU/mL)-1) was approximately 100 times increased than that for the UW alone case. These results revealed that the co-use of UV and UW can provide synergistic effect on bacterial disinfection in a tap-water condition in household humidifiers.

UCI(KEPA)

간행물정보

  • : 공학분야  > 토목공학
  • : KCI등재
  • :
  • : 격월
  • : 1225-7672
  • : 2287-822X
  • : 학술지
  • : 연속간행물
  • : 1987-2021
  • : 2018


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KCI등재

1대한상하수도학회지 목차

저자 : 대한상하수도학회

발행기관 : 대한상하수도학회 간행물 : 상하수도학회지 35권 4호 발행 연도 : 2021 페이지 : pp. 1-2 (2 pages)

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2베이지안 최적화를 통한 저서성 대형무척추동물 종분포모델 개발

저자 : 고병건 ( Byeonggeon Go ) , 신지훈 ( Jihoon Shin ) , 차윤경 ( Yoonkyung Cha )

발행기관 : 대한상하수도학회 간행물 : 상하수도학회지 35권 4호 발행 연도 : 2021 페이지 : pp. 259-275 (17 pages)

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This study explored the usefulness and implications of the Bayesian hyperparameter optimization in developing species distribution models (SDMs). A variety of machine learning (ML) algorithms, namely, support vector machine (SVM), random forest (RF), boosted regression tree (BRT), XGBoost (XGB), and Multilayer perceptron (MLP) were used for predicting the occurrence of four benthic macroinvertebrate species. The Bayesian optimization method successfully tuned model hyperparameters, with all ML models resulting an area under the curve (AUC) > 0.7. Also, hyperparameter search ranges that generally clustered around the optimal values suggest the efficiency of the Bayesian optimization in finding optimal sets of hyperparameters. Tree based ensemble algorithms (BRT, RF, and XGB) tended to show higher performances than SVM and MLP. Important hyperparameters and optimal values differed by species and ML model, indicating the necessity of hyperparameter tuning for improving individual model performances. The optimization results demonstrate that for all macroinvertebrate species SVM and RF required fewer numbers of trials until obtaining optimal hyperparameter sets, leading to reduced computational cost compared to other ML algorithms. The results of this study suggest that the Bayesian optimization is an efficient method for hyperparameter optimization of machine learning algorithms.

KCI등재

3산화철계 가중응집제가 활성슬러지의 침전성 및 탈수성에 미치는 영향

저자 : 양혜지 ( Hyeji Yang ) , 김용범 ( Yongbum Kim ) , 최영균 ( Younggyun Choi )

발행기관 : 대한상하수도학회 간행물 : 상하수도학회지 35권 4호 발행 연도 : 2021 페이지 : pp. 277-284 (8 pages)

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The ballasted flocculation effects of the mill scale and magnetite on activated sludge were investigated. Both ballasted flocculants (BF) could remarkably improve the sludge settleability in terms of zone settling velocity (ZSV) and sludge volume index (SVI). With the BF dosage of 0.2 to 2.0 g-BF/g-SS, the magnetite particles showed better efficiency on improving settling behavior of activated sludge than the mill scale due to higher surface area and hydrophobic property. The efficiency of SVI30 with magnetite injection was 2.5 to 11.3% higher than mill scale injection and that of the ZSV appreciated from 23.7% to 44.4% for magnetite injection. Averaged floc size of the BF sludge with magnetite dosage (0.5 g-BF/g-SS) was 2.3 times higher than that of the control sludge. Dewaterability of the sludge was also greatly improved by addition of the BF. The specific resistance to filtration (SRF) was reduced exponentially with increasing the dosage of BF. However, the BF's particle size effect on the SRF looks to be marginal. Consequently, for improving the dewaterability, the BF played a physical role to remove the pore water of the biological flocs by intrusive attachment and a chemical role to induce aggregation of the flocs by charge neutralization.

KCI등재

4응집-UF 전처리 공정이 압력지연삼투 공정에 미치는 영향

저자 : 고길현 ( Gilhyun Goh ) , 김수현 ( Suhyun Kim ) , 김정선 ( Jungsun Kim ) , 강임석 ( Limseok Kang )

발행기관 : 대한상하수도학회 간행물 : 상하수도학회지 35권 4호 발행 연도 : 2021 페이지 : pp. 285-292 (8 pages)

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Osmotic power is to produce electric power by using the chemical potential of two flows with the difference of salinity. Water permeates through a semipermeable membrane from a low concentration feed solution to a high concentration draw solution due to osmotic pressure. In a pressure retarded osmosis (PRO) process, river water and wastewater are commonly used as low salinity feed solution, whereas seawater and brine from the SWRO plant are employed as draw solution. During the PRO process using wastewater effluent as feed solution, PRO membrane fouling is usually caused by the convective or diffusive transport of PRO which is the most critical step of PRO membrane in order to prevent membrane fouling. The main objective of this study is to assess the PRO membrane fouling reduction by pretreatment to remove organic matter using coagulation-UF membrane process. The experimental results obtained from the pretreatment test showed that the optimum ferric chloride and PAC dosage for removal of organic matter applied for the coagulation and adsorption process was 50 mg/L as FeCl3 (optimum pH 5.5). Coagulation-UF pretreatment process was higher removal efficiency of organic matter, as also resulting in the substantial improvement of water flux of PRO membrane.

KCI등재

5정수처리 공정 적용을 위한 MCDI (Membrane Capacitive Deionization) Module의 수용액 내 TDS 제거 특성에 관한 연구

저자 : 오창석 ( Changseog Oh ) , 안주석 ( Jusuk An ) , 오현제 ( Hyun-je Oh )

발행기관 : 대한상하수도학회 간행물 : 상하수도학회지 35권 4호 발행 연도 : 2021 페이지 : pp. 293-300 (8 pages)

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Recently, various researches have been studied, such as water treatment, water reuse, and seawater desalination using CDI (Capacitive deionization) technology. Also, applications like MCDI (Membrane capacitive deionization), FCDI (Flow-capacitive deionization), and hybrid CDI have been actively studied. This study tried to investigate various factors by an experiment on the TDS (Total dissolved solids) removal characteristics using MCDI module in aqueous solution. As a result of the TDS concentration of feed water from 500 to 2,000 mg/L, the MCDI cell broke through faster when the higher TDS concentration. In the case of TDS concentration according to the various flow rate, 100 mL/min was stable. In addition, there was no significant difference in the desorption efficiency according to the TDS concentration and method of backwash water used for desorption. As a result of using concentrated water for desorption, stable adsorption efficiency was shown. In the case of the MCDI module, the ions of the bulk solution which is escaped from the MCDI cell to the spacer during the desorption process are more important than the concentration of ions during desorption. Therefore, the MCDI process can get a larger amount of treated water than the CDI process. Also, prepare a plan that can be operated insensitive to the TDS concentration of backwash water for desorption.

KCI등재

6키토산 비드의 교차결합(crosslinking)과 건조공정이 흡착속도에 미치는 영향

저자 : 신정우 ( Jeongwoo Shin ) , 김태훈 ( Taehoon Kim ) , 이영민 ( Youngmin Lee ) , 안병렬 ( Byungryul An )

발행기관 : 대한상하수도학회 간행물 : 상하수도학회지 35권 4호 발행 연도 : 2021 페이지 : pp. 301-309 (9 pages)

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Chitosan, natural organic polymer, has been applied in water treatment as adsorbent due to non-toxic for human being. The amino group as functional group, can interacts with cation and anion at the same time. The prepared chitosan bead (HCB) was crosslinked to increase chemical stability (HCB-G) and both HCB and HCB-G were prepared to increase physical strength by drying referred to DCB and DCB-G, respectively. The adsorption effect for crosslinking and drying for four types of chitosan bead was tested using pseudo fist order (PFO), pseudo second order (PSO), and intraparticle diffusion model (ID). Regardless of PFO and PSO, the order of K, rate constant, is as followed: HCB > HCB-G > DCB > DCB-G for Cu(II) and phosphate. Drying leading to contraction of bead significantly reduced adsorption rate due to reduce the porosity of chitosan. In addition, crosslingking also negatively effect on adsorption rate. When compared with Cu(II) using hydrogel bead, phosphate showed higher value than Cu(II) for PFO and PSO. The application of ID showed that both hydrogel beads (HCB and HCB-G) obtained a very low R2 ranging to 0.37 to 0.81, while R2 can be obtained to over 0.9 for DCB and DCB-G, indicting ID is appropriate for low adsorption rate.

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KCI등재

1대한상하수도학회지 목차

저자 : 대한상하수도학회

발행기관 : 대한상하수도학회 간행물 : 상하수도학회지 35권 3호 발행 연도 : 2021 페이지 : pp. 1-2 (2 pages)

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2통합 환경 관리를 위한 수질 환경의 질 목표 수준 설정 방법에 관한 연구

저자 : 황현정 ( Hyeon-jeong Hwang ) , 간종범 ( Jong-beom Khan ) , 서지혜 ( Ji Hye Seo ) , 이선경 ( Sunkyung Lee ) , 김영란 ( Young-lan Kim )

발행기관 : 대한상하수도학회 간행물 : 상하수도학회지 35권 3호 발행 연도 : 2021 페이지 : pp. 187-196 (10 pages)

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When evaluating the extent of the impact of water pollutants on the surrounding area, we would like to present the target level (proposal) of the quality of the environment, which is the standard for evaluation. We propose the environmental quality target level for substances that need to be applied domestically by investigating overseas cases operating the integrated environmental management system and the implications of domestic environmental pollutant management. The appropriateness of the environmental quality target level reviewed in this study was determined using data from the water quality measuring network, and future improvement measures were proposed. We review the available methodologies for setting quality objectives for the environment. It proposed the environmental quality target level for 21 substances that have domestic water pollutant emission standards and do not have environmental standards, and proposed future improvement measures. If it is necessary to add quality target-level items of the environment in the future, it is believed that expansion will be possible based on the methodology presented in this study.

KCI등재

3MBR에서 F/M비가 EPS 생성 및 fouling에 미치는 영향

저자 : 김윤지 ( Yun-ji Kim ) , 최윤정 ( Yun-jeong Choi ) , 황선진 ( Sun-jin Hwang )

발행기관 : 대한상하수도학회 간행물 : 상하수도학회지 35권 3호 발행 연도 : 2021 페이지 : pp. 197-204 (8 pages)

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In MBR, extracellular polymeric substance (EPS) is known as an important factor of fouling; soluble EPS (sEPS) affects internal contamination of membrane, and bound EPS (bEPS) affects the formation of the cake layer. The production of EPS changes according to the composition of influent, which affects fouling characteristics. Therefore, in this study, the effects of the F/M ratio on the sEPS concentration, bEPS content, and fouling were evaluated. The effects of F/M ratio on the amount and composition of EPS were confirmed by setting conditions that were very low or higher than the general F/M ratio of MBR, and the fouling occurrence characteristics were evaluated by filtration resistance distribution. As a result, it was found that the sEPS increased significantly with the increase of the F/M ratio. When the substrate was depleted, bEPS content decreased because bEPS was hydrolyzed into BAP and seemed to be used as a substrate. In contrast, when the substrate is sufficient, UAP (utilization-associated products) was rapidly generated in proportion with the consumption of the substrate. UAP has a relatively higher Protein/Carbohydrate ratio (P/C ratio) than BAP, and this means, it has a higher adhesive force to the membrane surface. As a result, UAP seems like causing fouling rather than BAP (biomass-associated products). Therefore, Rf (Resistance of internal contamination) increased rapidly with the increase of UAP, and Rc (Resistance of cake layer) increased with the accumulation of bEPS in proportion, and as a result, the fouling interval was shortened. According to this study, a high F/M ratio leads to an increment in UAP generation and accumulation of bEPS, and by these UAP and bEPS, membrane fouling is promoted.

KCI등재

4하수 유래 미량오염물질 현황과 관리 방안 고찰

저자 : 최상기 ( Sangki Choi ) , 이웅배 ( Woongbae Lee ) , 김영모 ( Young-mo Kim ) , 홍석원 ( Seok-won Hong ) , 손희종 ( Heejong Son ) , 이윤호 ( Yunho Lee )

발행기관 : 대한상하수도학회 간행물 : 상하수도학회지 35권 3호 발행 연도 : 2021 페이지 : pp. 205-225 (21 pages)

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Due to the large-scale production and use of synthetic chemicals in industralized countries, various chemicals are found in the aquatic environment, which are often termed as micropollutants. Effluents of municipal wastewater treatment plants (WWTPs) have been identified as one of the major sources of these micropollutants. In this article, the current status of occurrence and removal of micropollutants in WWTPs and their management policies and options in domestic and foregin countries were critically reviewed. A large number of pharmaceuticals, personal care products, and industrial chemicals are found in WWTPs' influent, and are only partially removed by current biological wastewater treatment processes. As a result, some micropollutants are present in WWTPs' effluents, which can negatively affect receiving water quality or drinking water source. To better understand and assess the potential risk of micropollutants, a systematic monitoring framework including advanced analytical tools such as high resolution mass spectrometry and bioanalytical methods is needed. Some Western European countries are taking proactive approach to controlling the micropollutants by upgrading WWTP with enahnced effluent treatment processes. While this enahnced WWTP effluent treatment appears to be a viable option for controlling micropollutant, its implementation requires careful consideration of the technical, economical, political, and cultural issues of all stakeholders.

KCI등재

5초음파와 자외선(UV) 동시 적용이 가정용 가습기 내 살균에 미치는 시너지 효과에 대한 반응속도론적 연구

저자 : 김성아 ( Seunga Kim ) , 김지현 ( Jihyun Kim ) , 이민주 ( Minjoo Lee ) , 김자연 ( Jayun Kim ) , 정우식 ( Woosik Jung ) , 박준홍 ( Joonhong Park )

발행기관 : 대한상하수도학회 간행물 : 상하수도학회지 35권 3호 발행 연도 : 2021 페이지 : pp. 227-235 (9 pages)

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This study examined the effect of ultraviolet (UV) application on bacterial disinfection in a commercialized humidifier using ultrasonic wave (UW). To accurately examine disinfection kinetics in tap-water condition, tap-water was sterilized using a filter, and then inoculated with pure cultures of E. coli and P. putida with known viable counts. The disinfection kinetic characteristics were experimentally compared when UV alone, UW alone, and UW+UV together were applied in disinfecting the added bacteria in the commercialized humidifier. When UV alone was applied, bacterial disinfection kinetics followed a first-order decay reaction, and showed an approximately 10-time weaker disinfection compared to the typical UV disinfection in water treatment or wastewater treatment. When UW alone was applied, bacterial disinfection kinetics followed a second-order decay reaction with a low disinfection rate constant of 0.0002 min-1(CFU/mL)-1. When UV and UW were applied together, however and interestingly, the disinfection rate constant (0.0211 min-1(CFU/mL)-1) was approximately 100 times increased than that for the UW alone case. These results revealed that the co-use of UV and UW can provide synergistic effect on bacterial disinfection in a tap-water condition in household humidifiers.

KCI등재

6수도사업자의 주요 운영지표와 ILI(Infrastructure Leakage Index)와의 상관관계 분석

저자 : 전승희 ( Seunghui Jeon ) , 현인환 ( Inhwan Hyun ) , 김두일 ( Dooil Kim )

발행기관 : 대한상하수도학회 간행물 : 상하수도학회지 35권 3호 발행 연도 : 2021 페이지 : pp. 237-246 (10 pages)

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The ILI, developed by the IWA (International Water Association), has been used in many countries as an indicator of water leakage. In Korea, the revenue water has been used as a performance indicator for waterworks although there is an opinion to replace it with the ILI. Hence, it has been necessary to investigate whether the ILI can replace the revenue water in Korea. The four main operating indicators (i.e., water service population, profit-loss ratio, fiscal self-reliance, and aged pipe rate) of 162 Korean waterworks were compared with the ILI with the linear regression method. Local water authorities with more than 1 million water service population, with more than 60% profit-loss ratio, more than 40% and less than 60% fiscal self-reliance, and more than 20% aged pipe rate showed meaningful correlation between the four parameters and the ILI. In the remaining cases, their correlations were little or weak. This means that using the ILI may not be an efficient method to represent the performance of the water supply system in Korea because of the lack of UARL (Unavoidable Annual Real Losses) data accuracy. To use the ILI in Korea, it will be required to carry out an additional research to accumulate reliable CARL (Current Annual Real Losses) and UARL data in the future.

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