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대한상하수도학회> 상하수도학회지> 산화철계 가중응집제가 활성슬러지의 침전성 및 탈수성에 미치는 영향

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산화철계 가중응집제가 활성슬러지의 침전성 및 탈수성에 미치는 영향

The effect of iron oxide ballasted flocculant on the activated sludge settleability and dewaterability

양혜지 ( Hyeji Yang ) , 김용범 ( Yongbum Kim ) , 최영균 ( Younggyun Choi )
  • : 대한상하수도학회
  • : 상하수도학회지 35권4호
  • : 연속간행물
  • : 2021년 08월
  • : 277-284(8pages)
상하수도학회지

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1. 서 론
2. 재료 및 실험방법
3. 결 과
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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.

UCI(KEPA)

간행물정보

  • : 공학분야  > 토목공학
  • : KCI등재
  • :
  • : 격월
  • : 1225-7672
  • : 2287-822X
  • : 학술지
  • : 연속간행물
  • : 1987-2021
  • : 2022


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KCI등재

1대한상하수도학회지 목차

저자 : 대한상하수도학회

발행기관 : 대한상하수도학회 간행물 : 상하수도학회지 35권 5호 발행 연도 : 2021 페이지 : pp. 1-2 (2 pages)

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2파일롯 규모의 운영에 따른 하천수질(T-P) 개선에 관한 연구

저자 : 최경수 ( Kyoungsoo Choi ) , 이채영 ( Chaeyoung Lee )

발행기관 : 대한상하수도학회 간행물 : 상하수도학회지 35권 5호 발행 연도 : 2021 페이지 : pp. 323-334 (12 pages)

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Pilot-scale coagulation and sedimentation processes were operated to investigate the T-P (Total phosphorus) removal efficiency. A multiple regression model was also derived to predict the water quality improvement effect with river water characteristics. The inflow rates for the pilot-scale facility were 157-576 ㎥/day, and the coagulant doses were in the range of 13.7-58.5 mg/L (average 38.9 mg/L) for PAC (Poly alum chloride) and 16.5-62.1 mg/L (average 36.0 mg/L) for alum. The results found that the influent BOD (Biochemical oxygen demand) and T-P concentrations were 4.9 mg/L and 0.115 mg/L, and the removal efficiencies were 52.7% and 59.4%, respectively. T-P removal efficiencies on wet weather days were higher by 10% than dry weather days because influent solids influenced T-P's coagulation process. The pH of river water was 6.9-7.8, and the average pH was 7.3. Although the pH variation was not significant, the trend showed that the treatment efficiency of T-P and PO4-P removal increased. Thus, the pH range considered in this study seems to be appropriate for the coagulation process, which is essential for phosphorous removal. The T-P removal efficiencies were 19.6-93.3% (average 59.2%) for PAC and 16.4-98.5%(average 55.9%) for alum; thus, both coagulants showed similar results. Furthermore, the average coagulant doses were similar at 42.4 mg/L for PAC and 41.3 mg/L for alum. When the T-P concentration of the effluent was compared by the [Al]/[P] ratio, the phosphorus concentration of the treated water decreased with an increasing [Al]/[P] ratio, and the lowest T-P concentration range appeared at the [Al]/[P] ratio of 10-30. A seasonal multiple regression analysis equations were derived from the relationships between 10 independent and dependent variables (T-P concentration of effluent). This study could help lake water quality maintenance, reduce eutrophication, and improve direction settings for urban planning, especially plans related to developing waterfront cities.

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3지진 재해 대응을 위한 진동 기반 구조적 관로 상태 감시 시스템에 대한 고찰

저자 : 신동협 ( Dong-hyup Shin ) , 이정훈 ( Jeung-hoon Lee ) , 장용선 ( Yongsun Jang ) , 정동휘 ( Donghwi Jung ) , 박희등 ( Hee-deung Park ) , 안창훈 ( Chang-hoon Ahn ) , 변역근 ( Yuck-kun Byun ) , 김영준 ( Young-jun Kim )

발행기관 : 대한상하수도학회 간행물 : 상하수도학회지 35권 5호 발행 연도 : 2021 페이지 : pp. 335-349 (15 pages)

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As the frequency of seismic disasters in Korea has increased rapidly since 2016, interest in systematic maintenance and crisis response technologies for structures has been increasing. A data-based leading management system of Lifeline facilities is important for rapid disaster response. In particular, the water supply network, one of the major Lifeline facilities, must be operated by a systematic maintenance and emergency response system for stable water supply. As one of the methods for this, the importance of the structural health monitoring(SHM) technology has emerged as the recent continuous development of sensor and signal processing technology. Among the various types of SHM, because all machines generate vibration, research and application on the efficiency of a vibration-based SHM are expanding. This paper reviews a vibration-based pipeline SHM system for seismic disaster response of water supply pipelines including types of vibration sensors, the current status of vibration signal processing technology and domestic major research on structural pipeline health monitoring, additionally with application plan for existing pipeline operation system.

KCI등재

4정수처리공정 시뮬레이터 개발 기초연구

저자 : 변용훈 ( Yong-hoon Byun ) , 신휘수 ( Hwi-su Shin ) , 김호용 ( Ho-yong Kim ) , 정남정 ( Nahm-chung Jung )

발행기관 : 대한상하수도학회 간행물 : 상하수도학회지 35권 5호 발행 연도 : 2021 페이지 : pp. 351-365 (15 pages)

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Water treatment process simulator is the tool for predicting sequential changes of water quality in a train of unit processes. This predicts the changes through governing equations that represent physicochemical performance of each unit processes with an initial and boundary conditions. Since there is no operational data for the design of a water treatment facility, there is no choice but to predict the performance of the facility by assuming initial and boundary conditions in virtual reality. Therefore, a simulator that can be applied in the design stage of a water treatment facility has no choice but to be built as a numerical analysis model of a deductive technique. In this study, we had conducted basic research on governing equations, inter-process data-flow, and simulator algorithms for the development of simulators. Lastly, this study will contribute to design engineering tool development research in the future by establishing the water treatment theory so that it can be programmed in a virtual world and suggesting a method for digital transformation of the water treatment process.

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

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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.

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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.

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4응집-UF 전처리 공정이 압력지연삼투 공정에 미치는 영향

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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.

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

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

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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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