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한국물환경학회> 한국물환경학회지> 미세플라스틱 분리를 위한 미세기포 부상공정에서 개체군수지를 이용한 초기 부착 계수 및 부상특성의 평가

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미세플라스틱 분리를 위한 미세기포 부상공정에서 개체군수지를 이용한 초기 부착 계수 및 부상특성의 평가

Evaluation of Initial Collision-Attachment Coefficient and Flotation Characteristics Using Population Balance in Microbubble Flotation Process for Microplastics Separation

정흥조 ( Heung Joe Jung ) , 이재욱 ( Jae Wook Lee ) , 곽동희 ( Dong Heui Kwak )
  • : 한국물환경학회
  • : 한국물환경학회지 37권1호
  • : 연속간행물
  • : 2021년 01월
  • : 10-19(10pages)
한국물환경학회지

DOI

10.15681/KSWE.2021.37.1.10


목차

1. Introduction
2. Materials and Methods
3. Results and Discussion
4. Conclusions
Acknowledgement
References

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초록 보기

In the flotation process to remove microplastic (MP) particles, the attachment and separation efficiency is determined by the basic physicochemical characteristics of MP particles as well as bubbles. To evaluate the flotation characteristics of MP particles, we carried out a series of simulations using the population balance (PB) model. The initial attachment coefficient (αo) of MP particles was in the range of 0.2-0.275, and it was slightly lower than that of typical particles, such as clay, debris and algae particles, which exist in water bodies, αo, 0.3-0.4. The relative bubble number (RBN) attached to the surface of the typical number of bubbles was 0.30 and 0.32 for MP 30 μm and MP 58 μ m, respectively. In comparison, the RBN of larger MP particles (138 μm) was as high as 0.53. Furthermore, smaller microbubbles were required to separate properly or additional treatment needed to be applied to enhance collision and attachment efficiency since the flotation of MP particles was found to be difficult to treat as high-rate. As a result of comparing the removal rate (experimental value) of MP particles obtained from the batch-type flotation apparatus and the flotation removal rate (predicted value) of MP obtained through the PB model, the final particles by the particle size of MP overall except for the initial separation time area. With respect to the removal efficiency, the observed and predicted values were similar, and it was confirmed that the floating separation characteristics and evaluation of the MP particles through the PB model could be possible.

UCI(KEPA)

I410-ECN-0102-2022-500-000400430

간행물정보

  • : 공학분야  > 환경공학
  • : KCI등재
  • :
  • : 격월
  • : 2289-0971
  • : 2289-098X
  • : 학술지
  • : 연속간행물
  • : 1985-2022
  • : 2402


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1과망간산나트륨을 활용한 조류 대응 저탄소 전산화기술 실증화 연구

저자 : 하준수 ( Junsoo Ha ) , 허다니엘상두 ( Daniel Sangdu Hur ) , 임채언 ( Chaieon Im ) , 정동희 ( Donghee Jung ) , 임영성 ( Youngseong Lim ) , 주진경 ( Jinkyong Ju )

발행기관 : 한국물환경학회 간행물 : 한국물환경학회지 38권 6호 발행 연도 : 2022 페이지 : pp. 267-274 (8 pages)

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This paper is a result of research conducted on the 800,000 m3/d capacity of A Water Treatment Plant (WTP) and 400,000 m3/d capacity of B WTP plant in operation in the Nakdong River region. We evaluated the effect of algae broom on the WTP operation based on the running data of both WTP and the data on the pre-oxidation process field test for algae control using sodium permanganate (SPM) at the B WTP. The study results showed that during the algal bloom period, the coagulant dose increased by 102% in A WTP and 58% in B WTP, respectively, and the chlorine dose also increased by 38% and 29%, respectively, which may affect Total trihalomethane (THM) production. Data such as algal populations and Chl-a, residual chlorine and THM, algal populations, and ozone dose appeared also highly correlated, confirming that algal broom affects WTP operations, including water quality and chemical dosage. As a result of the field test of B WTP, THMs appeared lower than that of the control, suggesting the possibility of the SPM pre-oxidation process as an alternative to algae-related water quality management. Furthermore, in terms of GHG emissions due to energy consumption, it was observed that the pre-oxidation process using SPM was approximately 10.8%, which is a very low ratio compared to the pre-ozonation process. Therefore, these results suggest that the SPM pre-oxidation process can be recommended as an alternative to low-carbon water purification technology.

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2공동주택 지하저수조의 수질변화 및 부식성 특성

저자 : 장준영 ( Junyoung Jang ) , 김주원 ( Joowon Kim ) , 황유훈 ( Yuhoon Hwang ) , 김기팔 ( Kipal Kim ) , 신현상 ( Hyunsang Shin ) , 임병란 ( Byungran Lim )

발행기관 : 한국물환경학회 간행물 : 한국물환경학회지 38권 6호 발행 연도 : 2022 페이지 : pp. 275-281 (7 pages)

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To maintain water quality after water treatment, monitoring whether the quality of treated tap water quality changes is essential. However, current investigations are insufficient to prevent secondary contamination in drinking water supply systems. This study investigated Gyeonggi's e apartment where a red water problem occurred and monitored the water quality and corrosiveness of the overall water supply system to the apartment from June 2021 to April 2022. In a comparison of drinking water quality after water treatment and the influent of the reservoir, turbidity and heavy metal concentrations were increased and residual chlorine was decreased due to increases in temperature. Correlation analysis and principal component analysis (PCA) indicated that a low level of residual chlorine may cause the abscission of Mn2+ and Fe2+ through microorganism activation, which also causes a high level of turbidity. The corrosion index (LI) in the influent of the reservoir tank was increased due to Ca2+ and temperature. These results indicate that the corrosiveness of drinking water and the deterioration of drinking water quality were mainly increased between the drinking water treatment plant and the reservoir tank's influent. The findings provide clear evidence that it is essential to manage water supply systems and reservoir tanks to prevent the secondary contamination of drinking water.

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3호염기성 미세조류 Arthrospira platensis의 폐수처리 적용을 위한 종특이성 평가

저자 : 이수현 ( Su-hyeon Lee ) , 허재희 ( Jae-hee Huh ) , 황선진 ( Sun-jin Hwang )

발행기관 : 한국물환경학회 간행물 : 한국물환경학회지 38권 6호 발행 연도 : 2022 페이지 : pp. 282-291 (10 pages)

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Since the efficiency of wastewater treatment using microalgae differs depending on the metabolic characteristics of the species, it is important to understand the characteristics of target algae prior to the application in wastewater treatment. In this study, for the application of Arthrospira platensis to wastewater treatment, which is a filamentous alkaliphilic cyanobacteria, basic species specificity was identified and the possibility of application to wastewater treatment was investigated. As a result of the species specificity investigation, the specific growth rate between pH 7.0 and 11.0 showed the highest value near pH 9 at 0.25/day. The reason for the relatively low growth(0.08/day) at pH 11 was thought to be the CA(carbonic anhydrase) enzyme that is involved in carbon fixation during photosynthesis has the highest activity at pH 8.0 to 9.0, and at pH 11, CA activity was relatively low. In addition, A. platensis showed optimal growth at 400 PPFD(photosynthetic photon flux density) and 30℃, and this means that cyanobacteria such as A. platensis have a larger number of PS-I(photosystem I) than that of PS-II(photosystem II). It was speculated that it was because higher light intensity and temperature were required to sufficiently generate electrons to transfer to PS-I. Regarding the applicability of A. platensis, it was suggested that if a system using the synergistic effect of co-culture of A. platensis and bacteria was developed, a more efficient system would be possible. And different from single cocci, filamentous A. platensis expected to have a positive impact on harvesting, which is very important in the latter part of the wastewater treatment process.

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4머신러닝과 딥러닝을 이용한 영산강의 Chlorophyll-a 예측 성능 비교 및 변화 요인 분석

저자 : 심선희 ( Sun-hee Shim ) , 김유흔 ( Yu-heun Kim ) , 이혜원 ( Hye Won Lee ) , 김민 ( Min Kim ) , 최정현 ( Jung Hyun Choi )

발행기관 : 한국물환경학회 간행물 : 한국물환경학회지 38권 6호 발행 연도 : 2022 페이지 : pp. 292-305 (14 pages)

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The Yeongsan River, one of the four largest rivers in South Korea, has been facing difficulties with water quality management with respect to algal bloom. The algal bloom menace has become bigger, especially after the construction of two weirs in the mainstream of the Yeongsan River. Therefore, the prediction and factor analysis of Chlorophyll-a (Chl-a) concentration is needed for effective water quality management. In this study, Chl-a prediction model was developed, and the performance evaluated using machine and deep learning methods, such as Deep Neural Network (DNN), Random Forest (RF), and eXtreme Gradient Boosting (XGBoost). Moreover, the correlation analysis and the feature importance results were compared to identify the major factors affecting the concentration of Chl-a. All models showed high prediction performance with an R2 value of 0.9 or higher. In particular, XGBoost showed the highest prediction accuracy of 0.95 in the test data. The results of feature importance suggested that Ammonia (NH3-N) and Phosphate (PO4-P) were common major factors for the three models to manage Chl-a concentration. From the results, it was confirmed that three machine learning methods, DNN, RF, and XGBoost are powerful methods for predicting water quality parameters. Also, the comparison between feature importance and correlation analysis would present a more accurate assessment of the important major factors.

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5LOADEST 모형을 활용한 수질 경향성 분석: 영산강 수계를 중심으로

저자 : 이기순 ( Gi-soon Lee ) , 백종훈 ( Jonghun Baek ) , 최지연 ( Ji Yeon Choi ) , 이영재 ( Youngjea Lee ) , 신동석 ( Dong Seok Shin ) , 하돈우 ( Don-woo Ha )

발행기관 : 한국물환경학회 간행물 : 한국물환경학회지 38권 6호 발행 연도 : 2022 페이지 : pp. 306-315 (10 pages)

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In this study, long-term measurement data were applied to the LOADEST model and used as an analysis tool to identify and interpret trends in pollution load. The LOADEST model is a regression equation-based pollution load estimation program developed by the United States Geological Survey (USGS) to estimate the change in the pollution load of rivers according to flow rate and time and provides 11 regression equations for pollution load evaluation. As a result of simulating the Gwangjuchen2, Pungyeongjeongchen, and Pyeongdongchen in the Yeongbon B unit basin in the middle and upper reaches of the Yeongsan River with the LOADEST model using water quality and flow measurement data, lower values were observed for the Gwangjuchen2 and Pyeongdongchen, whereas the Pungyeongjeongchen had higher values. This was judged to be due to the characteristics of the LOADEST model related to data continuity. According to the parameters estimated by the LOADEST model, pollutant trends were affected by increases in the flow. In addition, variability increased with time, and BOD and T-P were affected by the season. Thus, the LOADEST model can contribute to water quality management as an analytical tool for long-term data monitoring.

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6만경강 본류 중 오염우심지역의 TP 저감방안 연구

저자 : 최정화 ( Jounghwa Choi ) , 권재옥 ( Jaeog Kwon ) , 이미선 ( Miseon Lee ) , 장욱 ( Wook Jang ) , 최근화 ( Geunhwa Choi ) , 고은혜 ( Eunhye Ko ) , 심서현 ( Seohyeon Sim ) , 조창우 ( Changwoo Cho )

발행기관 : 한국물환경학회 간행물 : 한국물환경학회지 38권 6호 발행 연도 : 2022 페이지 : pp. 316-326 (11 pages)

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Agricultural season, Non-point pollution source, Pollution contribution rate, Stormwater pipeline, Total phosphate (TP)


This study aimed to investigate the causes of the increasing Total Phosphate(TP) in the mainstream of Mangyeong river over the past 10 years, and suggested a reduction plan of about 3 points. First, the high TP concentration was continuously released in the discharge outlet of the Haepo bridge stormwater pipeline. The average TP concentration was 5.066 mg/L and values as high as 29.470 mg/L were measured. The highest pollution contribution rate to the Mangyeong river was more than 70 %. The cause of the pollution was expected to take place somewhere in Wanju Industrial Complex. Second, the average TP concentration of wastewater-treated effluent in the H factory was 0.405 mg/L. If a TP reduction facility is additionally installed in the H factory, it will help reduce TP uptake by Lake Saemangeum. Third, the TP concentration of untreated non-point source point flowing into the Samrae stream was very high with an average of 2.828 mg/L. Also, the pollution contribution rate of Samraecheon 2 to Mangyeong river was 21.8 % on average and up to 58 %. The pollution contribution rate was also high during the agricultural season and the winter, during which the flow rate is decreased. Investigation of these three points may be continuously needed, and analysis results and policy proposals presented to Jeollabukdo and Wanjugun to manage pollution sources.

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1퇴적물 재부유에 따른 유기물과 중금속 용출 및 용존산소량 변화 특성에 대한 연구

저자 : 강선경 ( Seon Gyeong Kang ) , 이한샘 ( Han Saem Lee ) , 임병란 ( Byung Ran Lim ) , 이동석 ( Dong Seok Rhee ) , 신현상 ( Hyun Sang Shin )

발행기관 : 한국물환경학회 간행물 : 한국물환경학회지 37권 1호 발행 연도 : 2021 페이지 : pp. 1-9 (9 pages)

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The depletion of dissolved oxygen (DO) in urban streams has a profound effect on the aquatic ecosystem; however, the change in DO by resuspension of sediments and the cause have not been sufficiently investigated. In this study, the physicochemical properties (particle size, and the content of organic and heavy metals) of the sediments of an urban stream (Anyang Stream) and the characteristics of water quality changes (DO, dissolved organic carbon (DOC), dissolved nitrogen (DN), sediment oxygen demand (SOD), and adenosine triphosphate (ATP)) by sediment resuspension were investigated. The sediment content of fine particles (< 0.2 mm) increased from 36.7% to 52.7% from the upstream to the downstream, and the contents of heavy metals and organic matter of the sediment were also higher towards the downstream. The depletion of DO by resuspension was observed in the sediment at the downstream sites (P8, P9), where the fine particle content was high, and biological SOD (BSOD) was more than 88% compared to the total SOD. The increase in BSOD coincided with the increase in ATP. It was also confirmed that the depletion of DO could increase the amount of heavy metals (such as Fe, Mn, and Pb) released from the sediment. Based on the above results, it can be concluded that resuspension of sediments induces rapid water quality changes and may cause accidents, such as fish mortality, during rainfall, and such a water quality effect can be more pronounced in sediments with a high content of fine particles and organic matter and high biological activity.

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2미세플라스틱 분리를 위한 미세기포 부상공정에서 개체군수지를 이용한 초기 부착 계수 및 부상특성의 평가

저자 : 정흥조 ( Heung Joe Jung ) , 이재욱 ( Jae Wook Lee ) , 곽동희 ( Dong Heui Kwak )

발행기관 : 한국물환경학회 간행물 : 한국물환경학회지 37권 1호 발행 연도 : 2021 페이지 : pp. 10-19 (10 pages)

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In the flotation process to remove microplastic (MP) particles, the attachment and separation efficiency is determined by the basic physicochemical characteristics of MP particles as well as bubbles. To evaluate the flotation characteristics of MP particles, we carried out a series of simulations using the population balance (PB) model. The initial attachment coefficient (αo) of MP particles was in the range of 0.2-0.275, and it was slightly lower than that of typical particles, such as clay, debris and algae particles, which exist in water bodies, αo, 0.3-0.4. The relative bubble number (RBN) attached to the surface of the typical number of bubbles was 0.30 and 0.32 for MP 30 μm and MP 58 μ m, respectively. In comparison, the RBN of larger MP particles (138 μm) was as high as 0.53. Furthermore, smaller microbubbles were required to separate properly or additional treatment needed to be applied to enhance collision and attachment efficiency since the flotation of MP particles was found to be difficult to treat as high-rate. As a result of comparing the removal rate (experimental value) of MP particles obtained from the batch-type flotation apparatus and the flotation removal rate (predicted value) of MP obtained through the PB model, the final particles by the particle size of MP overall except for the initial separation time area. With respect to the removal efficiency, the observed and predicted values were similar, and it was confirmed that the floating separation characteristics and evaluation of the MP particles through the PB model could be possible.

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3하·폐수처리시설 방류수내 유기물질 및 NOD 분포 특성

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발행기관 : 한국물환경학회 간행물 : 한국물환경학회지 37권 1호 발행 연도 : 2021 페이지 : pp. 20-31 (12 pages)

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In this study, an analysis of the characteristics of organic matter and nitrogenous oxygen demand (NOD) of 17 sewage effluent and wastewater treatments was conducted. High CODMn and carbonaceous biological oxygen demand (CBOD) concentrations were observed in the livestock treatment plants (LTP), wastewater treatment plants(WTP), and night soil treatment plants (NTP), but the highest NOD concentration and contribution rates of NOD to BOD5 were found in sewage treatment plants (STP). There was no significant difference in the CBOD/CODMn ratio for each of the six pollution source groups, but the LTPs, WTPs, and NTPs all showed relatively high CODMn concentrations in their effluent samples, indicating that they are facilities which discharge large amounts of refractory organic matter. The seasonal change of NOD in all facilities' effluent was found to be larger than the seasonal change of CBOD, and data results also revealed an elevation of NOD and NH3-N concentration from December to February, when the water temperature was low. There was no significant difference in NH3-N concentration in relation to pollution source group (p=0.08, one-way ANOVA), but the STP, which had a high NOD contribution rate to BOD5 of 48%, showed a high correlation between BOD5 and NOD (r2=0.95, p<0.0001). These results suggest that the effect of NOD on BOD5 is an important factor to be considered when analyzing STP effluent.

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발행기관 : 한국물환경학회 간행물 : 한국물환경학회지 37권 1호 발행 연도 : 2021 페이지 : pp. 32-46 (15 pages)

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South Korea has been divided into quantities and water quality, and due to a revision of the Government Organization law in June 2018, the controversial water management system was integrated into the Ministry of Environment. The total Maximum Daily Loads System has been called the flower of water quality control, and since 2004, all three major river systems which have been introduced into the Han River system, despite its various difficult environments, and subsequently leading to all of the four major rivers undergoing obligatory implementation since 2013. Currently, the target TMDL (Han River Phase 1 and Other Water Systems Phase 3) for the 2020 stage has been implemented. The domestic TMDL established a basic plan for calculating the load which complies with the unit watershed's target water quality, as well as an implementation plan for annual load management, both which have been institutionalized in order to evaluate load compliance on a repeated annual basis. Local governments ask external organizations to conduct investigations every year in order to assess the transition, which thereby requires tens of millions of won every year. Therefore, an assessment and management model that can be easily operated at the TMDL personnel level is required. In this study, when the Han river Water System TMDL was implemented in earnest, we confirmed the the water quality improvement effect when TMDL was introduced to major inflow tributaries (TancheonA, JungnangA, AnyangA) under the Seoul City's jurisdiction through the use of the total amount control unit basin evaluation technique. By presenting customized management measures, we propose the guidelines that are necessary for determining more effective water environmental policies.

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발행기관 : 한국물환경학회 간행물 : 한국물환경학회지 37권 1호 발행 연도 : 2021 페이지 : pp. 47-54 (8 pages)

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Aerobic granular sludge (AGS) can be classified as a type of self-immobilized microbial aggregates measuring more than 0.2 mm. It offers the option to simultaneously remove COD, N, and P that occur in different zones inside a granule. Also, AGS is characterized by high precipitability, treatability with high organic loading, and high tolerance to low temperature. In this study, a sequencing batch reactor inoculated with AGS (AGS-SBR) is a new advanced wastewater treatment process that was proven to grow AGS with integrated nutrient removal and low C/N ratio. A pilot plant, AGS-SBR with a capacity of 225 m3/d was installed at an S sewage treatment plant in Gyeonggi-do. The results of the operation showed that the water quality of the effluent indicated that the value of BOD5 was 1.5 mg/L, CODMn was 11.4 mg/L, SS was 6.2 mg/L, T-N was 13.2 mg/L, and T-P was 0.197 mg/L, and all of these values reliably satisfied an effluent standard (I Area). In winter, the T-N treatment efficiency at a lower temperature of less than 11℃ also showed reliability to meet the effluent standard of the I Area (20 mg/L or less). Analysis of microbial community in AGS showed a higher preponderance of beneficial microorganisms involved in denitrification and phosphorus accumulation compared with activated sludge. The power consumption and sludge disposal cost were reduced by 34.7% and 54.9%, respectively, compared to the domestic SBR type sewage treatment plant with a processing capacity of 1,000 m3/d or less.

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