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上下水道學會誌 = Journal of Korean Society of Water and W... 8건

  1. [국내논문]   산화-막여과에 의한 망간 제거 시 과망간산과 차아염소산 복합 주입의 효과   KCI

    곽효은 (연세대학교 환경공학부 ) , 박정원 (연세대학교 환경공학부 ) , 민소진 (연세대학교 환경공학부 ) , 임주완 (연세대학교 환경공학부 ) , 김기홍 (연세대학교 환경공학부 ) , 이호성 (연세대학교 환경공학부 ) , 남창현 (연세대학교 환경공학부 ) , 박용민 ((주)코웨이 ) , 박병규 (연세대학교 환경공학부)
    上下水道學會誌 = Journal of Korean Society of Water and Wastewater v.32 no.3 ,pp. 211 - 220 , 2018 , 1225-7672 ,

    초록

    The water containing soluble manganese may cause problems such as discolored water, unpleasant taste, fouling or scaling of pipes in water distribution system, and so on. Conventional water treatment processes using sand filtration or sedimentation after oxidation, however, cannot often meet manganese standard for drinking water. Two types of oxidants, potassium permanganate ( $KMnO_4$ ) and sodium hypochlorite (NaOCl), were utilized at the same time for manganese oxidation, and then the precipitated manganese oxides were removed by low pressure membrane filtration in this study. In batch experiments, the multiple injection of both oxidants showed more effective manganese removal than did the single injection using either of them. Moreover, the deterioration of manganese removal at low temperature was less serious for the multiple injection than that for the single injection. Manganese removal by the continuous system of oxidation by multiple injection combined with membrane filtration was higher than those by batch experiments at the same oxidation conditions. In addition, less membrane fouling was observed for membrane filtration with oxidation during continuous membrane filtration than membrane filtration without oxidation. These results indicate that the oxidation by multiple injection coupled with membrane filtration was efficient and applicable to actual water treatment for manganese removal.

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  2. [국내논문]   SWAT을 이용한 AR5 기후변화 시나리오에 의한 섬진강 요천유역의 유량 및 오염부하량 변화 예측   KCI

    장유진 (충남대학교 환경공학과 ) , 박종태 (충남대학교 환경공학과 ) , 서동일 (충남대학교 환경공학과)
    上下水道學會誌 = Journal of Korean Society of Water and Wastewater v.32 no.3 ,pp. 221 - 233 , 2018 , 1225-7672 ,

    초록

    Two climate change scenarios, the RCP (Representative Concentration Pathways) 4.5 and the RCP 8.5 in the fifth Assessment Report (AR5) by Intergovernmental Panel on Climate Change (IPCC), were applied in the Yocheon basin area using the SWAT (Soil and Water Assessment Tool) model to estimate changes in flow rates and pollutant loadings in the future. Field stream flow rate data in Songdong station and water quality data in Yocheon-1 station between 2013~2015 were used for model calibration. While $R^2$ value of flow rate calibration was 0.85 and $R^2$ value of water qualities were in the 0.12~0.43 range. The total study period was divided into 4 sub periods as 2030s (2016~2040), 2050s (2041~2070) and 2080s (2071~2100). The predicted results of flow rates and water quality concentrations were compared with results in calibrated periods, 2015s (2013~2015). In both RCP scenarios, flow rate and TSS (Total Suspended Solid) loadings were estimated to be in increasing trend while TN (Total Nitrogen) and TP (Total Phosphorus) loadings showed decreasing patterns. Also, flow rates and pollutant loadings showed larger differences between the maximum and the minimum values in RCP 4.5 than RCP 8.5 scenarios indicating more severe effect of drought and flood, respectively. Dependent on simulation period and rainfall periods in a year, flow rate, TSS, TN and TP showed different trends in each scenario. This emphasizes importance of considerations on time and space when analyzing climate change impacts of each variable under various scenarios.

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  3. [국내논문]   수돗물 부식성 제어를 통한 수도관 부식방지기술: 석회수 분산화장치를 이용한 미네랄 공급 효과와 영향 분석   KCI

    한금석 (서울물연구원 ) , 박영복 (서울물연구원 ) , 김성재 (서울물연구원 ) , 김현돈 (서울물연구원 ) , 최영준 (서울물연구원 ) , 박주현 (국립환경과학원 ) , 우달식 ((주)아름다운환경 ) , 홍성호 (숭실대학교 화학공학부)
    上下水道學會誌 = Journal of Korean Society of Water and Wastewater v.32 no.3 ,pp. 235 - 242 , 2018 , 1225-7672 ,

    초록

    Corrosion inhibitors including calcium hydroxide have been used to prevent corrosion in the pipes for tap water supply. The corrosion index (i.e., Langelier Index) differs by area and water quality. The corrosion indices of the areas studied differed by more than 2.0. The 'homogenized' calcium hydroxide was added to the treated water at the K water treatment plant, in order to increase the value of the corrosion index and the concentration of calcium. As the result, the concentration of calcium was increased while the turbidity and pH changed little. The corrosion rate of the tap water with the 'homogenized' calcium hydroxide could be slowed down pretty much. The results suggested that the technology of 'homogenization' of calcium hydroxide can applied to tap water and desalinated water to prevent corrosion in water pipes even in corrosive pipes.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  4. [국내논문]   영가철 나노입자가 충진된 컬럼을 이용한 질산성 질소 환원 성능 평가   KCI

    홍영표 (서울과학기술대학교 환경공학과 ) , 서영교 (서울과학기술대학교 환경공학과 ) , 김효원 (서울과학기술대학교 환경공학과 ) , 황유훈 (서울과학기술대학교 환경공학과)
    上下水道學會誌 = Journal of Korean Society of Water and Wastewater v.32 no.3 ,pp. 243 - 251 , 2018 , 1225-7672 ,

    초록

    In this study, we compared the MZVI (Microscale Zero-Valent Iron) and NZVI (Nanoscale Zero-Valent Iron) for reactivity and mobility in a column to reduce nitrate, which is a major pollutant in Korea, and investigated the effect of operational parameters on the NZVI filled column. For the comparison of MZVI and NZVI, samples were collected for 990 minutes using fractionator in the similar operation conditions (MZVI 10g, NZVI 2g). The nitrate reduction efficiency of NZVI was about 5 times higher than that of MZVI, which was about 7.45% and 38.75% when using MZVI and NZVI, respectively. In the mobility experiment, the MZVI descended due to gravity while NZVI moved up with water flow due to its small size. Furthermore, the optimum condition of NZVI filled column was determined by changing the flow rate and pH. The amount of Fe ions was increased as the pH of the nitrate solution was lowered, and the nitrate removal rate was similar due to the higher yield of hydroxyl groups. The removal rate of nitrate nitrogen was stable while flow rate was increased from 0.5 mL/min to 2.0 mL/min (empty bed contact time: 2.26 min to 0.57 min). NZVI has a high reduction rate of nitrate, but it also has a high mobility, so both of reactivity and mobility need to be considered when NZVI is applied for drinking water treatment.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  5. [국내논문]   Hydrogel 키토산비드를 이용한 수중의 양이온 중금속과 음이온의 제거 효율 평가   KCI

    안병렬 (상명대학교 건설시스템공학과)
    上下水道學會誌 = Journal of Korean Society of Water and Wastewater v.32 no.3 ,pp. 253 - 259 , 2018 , 1225-7672 ,

    초록

    Cu(II) can cause health problem for human being and phosphate is a key pollutant induces eutrophication in rivers and ponds. To remove of Cu(II) and phosphate from solution, chitosan as adsorbent was chosen and used as a form of hydrogel bead. Due to the chemical instability of hydrogel chitosan bead (HCB), the crosslinked HCB by glutaraldehyde (GA) was prepared (HCB-G). HCB-G maintained the spherical bead type at 1% HCl without a loss of chitosan. A variety of batch experiment tests were carried out to determine the removal efficiency (%), maximum uptake (Q, mg/g), and reaction rate. In the single presence of Cu(II) or phosphate, the removal efficiency was obtained to 17 and 16%, respectively. However, the removal efficiency of Cu(II) and phosphate was increased to 50~55% at a mixed solution. The maximum uptake (Q) for Cu(II) and phosphate was enhanced from 11.3 to74.4 mg/g and from 3.34 to 36.6 mg/g, respectively. While the reaction rate of Cu(II) and phosphate was almost finished within 24 and 6 h at single solution, it was not changed for Cu(II) but was retarded for phosphate at mixed solution.

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  6. [국내논문]   하수처리공정에서 이산화탄소를 이용한 스트러바이트 제어에 관한 연구   KCI

    한금석 (서울물연구원 ) , 홍성호 (숭실대학교 화학공학과 ) , 최영준 (서울물연구원)
    上下水道學會誌 = Journal of Korean Society of Water and Wastewater v.32 no.3 ,pp. 261 - 268 , 2018 , 1225-7672 ,

    초록

    Sludge transporting pipes in wastewater treatment plant are easy to be clogged with struvite when the digested sludge and dehydrated filtrate are transported through the pipes, which lowers the efficiency of sludge treatment system in a WWTP. pH is one of the most important factors in struvite formation, and carbon dioxide separated from biogas can be used to control pH and struvite formation. By controlling pH, the amount of dehydrating agent can be reduced by about 10%, which saves the budget for facility maintenance. As $CO_2$ is reused and dehydrating chemicals are saved, the approach can contribute to global warming gas reduction.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  7. [국내논문]   가축매몰지 소멸시 잔존물 처리방안   KCI

    김건하 (한남대학교 토목환경공학과)
    上下水道學會誌 = Journal of Korean Society of Water and Wastewater v.32 no.3 ,pp. 269 - 277 , 2018 , 1225-7672 ,

    초록

    Burials for the rapid disposal of carcasses have diverse and profound effects on the rural living condition, natural environment, and local economy throughout construction, management and final destruction of burials. In this study, possible residue excavated from standard burials, storage using FRP (Fiberglass Reinforced Plastic) tanks, and microbial-treated burials are characterized as carcasses, contaminated soil by leachate, and wasted plastic film. Treatment technologies for volume reduction of the residue including composting, rendering, and thermal hydrolysis were investigated. If the solid and liquid residues generated during volume reduction treatment are directly transferred to the environmental facilities, it may cause disorder due to high concentrations of organics, antibiotics, and lipid. Benefits and drawbacks of composting as a volume reduction techniques are extensively investigated. We also discussed that proper treatment of excavated soils and the reusing the treated soil as agricultural purpose. For the protection of public health and worker's hygiene, treatment criteria including produced residue qualities, and quality standards for the treated soil as agricultural use are required. In addition, Scientific manual for the proper treatment of residues is required. It is necessary to consider the establishment of a pretreatment facility to the occurrence of large-scale residue treatment.

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  8. [국내논문]   상수 염소 처리 과정중에 형성되는 N-니트로소디메틸아민에 대한 이해: 전구체의 특징, 경로와 경감   KCI

    민기 (한국과학기술연구원 ) , 손아섬 (한국과학기술연구원 ) , 조강우 (포항공과대학교 ) , 홍석원 (한국과학기술연구원)
    上下水道學會誌 = Journal of Korean Society of Water and Wastewater v.32 no.3 ,pp. 279 - 289 , 2018 , 1225-7672 ,

    초록

    N-nitrosodimethylamine (NDMA) is a class of disinfection byproducts and a frequently detected nitrosamine with carcinogenic potentials. This review summarizes NDMA precursors, their formation mechanisms in chloraminated water, and mitigation strategies. Understanding the formation mechanism and characteristics of precursors is essential for developing a mitigation strategy. Dimethylamine (DMA), the most widely studied NDMA precursor, has an NDMA molar yield up to 3%. In comparison, a subset of tertiary amines, e.g., pharmaceuticals, generate up to 90% upon chloramination. Potent NDMA precursors, are characterized by their negative partial charge, low planarity values and molecular weight, and high bond length and $pK_a$ values. A nucleophilic substitution of tertiary amine on chloramine is a key reason for the high NDMA yield from the most potent NDMA precursors. The distribution and fate of NDMA in surface water, aquifers, and its formation in the distribution system can be mitigated through two strategies: (1) degrading or/removing NDMA after its formation and (2) pre-treatment of its precursor's prior chloramination.

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