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한국수처리학회지 update

Journal of Korea Society of Water Science and Technology

  • : 한국수처리학회(구 한국수처리기술연구회)
  • : 공학분야  >  환경공학
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수록정보
수록범위 : 1권1호(1993)~28권2호(2020) |수록논문 수 : 1,319
한국수처리학회지
28권2호(2020년 04월) 수록논문
최근 권호 논문
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KCI등재

1제올라이트 여재의 암모니아성 질소 이온교환 능력에 따른 ZBAF의 질산화 효율 비교

저자 : 김진수 ( Jin-su Kim ) , 최승규 ( Seung-kyu Choi ) , 주천 ( Qian Zhu ) , 신관우 ( Gwan-woo Shin ) , 양창환 ( Chang-hwan Yang ) , 원경자 ( Kyoung-ja Weon ) , 이상일 ( Sang-ill Lee )

발행기관 : 한국수처리학회(구 한국수처리기술연구회) 간행물 : 한국수처리학회지 28권 2호 발행 연도 : 2020 페이지 : pp. 3-11 (9 pages)

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This study was conducted to investigate nitrification by measuring the ammonia nitrogen adsorption ability of zeolite media. Zeolite adsorbs ammonia nitrogen through cation exchange. When zeolite is used as the filteration media in biological aerated filters (BAF), nitrifying bacteria can be easily attached. Using two types of zeolite that have different calcination temperatures, it was confirmed differences in nitrification rate relative to the ammonium ions exchange capacity of the zeolite media. The strength of the zeolite media was higher as calcination temperature was higher, while BET specific surface area was decreased. The ammonia nitrogen adsorption of the zeolite media at 600℃ was higher than at 900℃, but nitrification rates were similar when either media was used for the zeolite biological aerated filter (ZBAF). During the entire operation period, the 600℃ zeolite had an ammonia nitrogen removal rate of 0.31 kg/m3/d, and the 900℃ zeolite media had a rate of 0.28 kg/m3/d (p>0.05). When the influent was held on shutdown for a month and processing began again, the nitrification rate of the ZBAFs showed a similar amount of NOx-N (sum of the concentration of nitrite and nitrate nitrogen) production within two days of reoperation that was similar to the rate before shutdown. The effect of water temperature had little effect on rate. Ammonia nitrogen removal by ZBAFs was maintained in water temperatures as low as 5℃. However, the ammonia nitrogen removal and nitrification rate were decreased in 600℃ zeolite media after 3 months of operation because media's morphology changed.

KCI등재

2활성탄에 의한 Direct Yellow 9 염료의 흡착 공정 파라미터 연구

저자 : 이종집 ( Jong-jib Lee )

발행기관 : 한국수처리학회(구 한국수처리기술연구회) 간행물 : 한국수처리학회지 28권 2호 발행 연도 : 2020 페이지 : pp. 13-22 (10 pages)

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In this study, the adsorption process parameters of direct yellow 9 (DY 9) dye by activated carbon in an aqueous solution were measured using adsorption variables that included adsorbent dose, pH, contact time, initial concentration and temperature. The adsorption equilibrium data were applied to the Langmuir, Freundlich, Temkin, and Halsey equations. The adsorption equilibrium data can be described well using the four isotherm models. The Langmuir separation coefficient (RL=0.549~0.859) and the Freundlich constant (1/n=0.780~0.998) were evaluated to confirm that the adsorption of DY 9 by activated carbon was an effective treatment method. The Temkin constant (BT=2.147~2.562 J/mol) and Dubinin-Radushkevich constant (E=0.211~0.255 kJ/mol) showed that this process was associated with physical adsorption. The kinetic experimental results showed that the adsorption process fits well to a pseudo-second-order model. Because the activation energy equals 30.97 kJ/mol and the reaction has a positive enthalpy (16.685 kJ/mol), the adsorption of DY 9 by activated carbon is a physisorption process and is also endothermic. The negative Gibbs free energy (ΔG= -5.316~-3.958 kJ/mol) indicates that the adsorption process is spontaneous.

KCI등재

3커피 찌꺼기를 이용한 Methylene Blue 염료 흡착특성 연구

저자 : 강슬기 ( Seul-gi Kang ) , 박진희 ( Jinhee Park ) , 김동수 ( Dong-su Kim )

발행기관 : 한국수처리학회(구 한국수처리기술연구회) 간행물 : 한국수처리학회지 28권 2호 발행 연도 : 2020 페이지 : pp. 23-32 (10 pages)

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In this study, coffee ground as waste resources were recycled to remove methylene blue dye wastewater by the adsorption treatment. It was investigated that the adsorption mechanism of methylene blue on the coffee ground based on the isotherm, kinetics and thermodynamics using the various experiment factor like pH, ionic strength and temperature. As coffee ground dosage increased, the adsorption efficiency increased from 26.2% to 94.1%. On the contrary, the unit adsorption amount decreased as coffee ground dosage increased. The maximum unit adsorption amount was 16.33 mg/g when coffee ground dosage was 20 mg. The adsorption efficiency was shown to be over 90% in the pH range of 4 to 11. Below pH 4, adsorption efficiency was significantly decreased. The adsorption process followed Langmuir isotherm equation well, and the value of RL demonstrated that the adsorption process is suitable. The kinetic parameters also indicated that the adsorption followed pseudo second equation better than pseudo first equation. The thermodynamic parameters ΔG°, ΔH° and ΔS° values calculated to be the adsorption belonged to the physical adsorption process, and it was advantageous at low temperature. As the result, it was confirmed that the adsorption study of methylene blue using coffee ground was the exothermic reaction and adsorption freedom decreased.

KCI등재

4MBR공정의 혼합액 슬러지 성분에 따른 기질저감과 막오염특성

저자 : 이형옥 ( Hyeong-ok Lee ) , 현길수 ( Kil-soo Hyun )

발행기관 : 한국수처리학회(구 한국수처리기술연구회) 간행물 : 한국수처리학회지 28권 2호 발행 연도 : 2020 페이지 : pp. 33-41 (9 pages)

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This study aims to investigate the effects of sludge components and agitation rate on contaminant removal, membrane filtration, and fouling in a membrane bioreactor (MBR) by using a dead-end stirrer cell. The real mixed liquor used for this study was pretreated to segregate three sludge components, namely activated sludge (AS), suspended solids (SS), and supernatant (SUP) including colloids and solutes. In reducing the contaminants, MBR filtration of AS and SS at agitation rates of 0 - 1000 rpm achieved higher efficiencies (20-30%) than those of achieved SUP filtration. In particular, the removal efficiencies of COD and T-P by the MBR were about three times higher than that of T-N. In reducing total organic carbon (TOC) and dissolved organic carbon (DOC), the MBR filtration of AS and SS achieved 1.7 times higher efficiency than that of SUP, whereas the MBR filtration of SUP in reducing ultraviolet at 254nm (UV254) achieved 1.4 and 4.7 times higher efficiencies, respectively than those of AS and SS. On the other hand, the profiles of TMP build-up within 30 min of filtration time were larger, corresponding to AS > SS > SUP. This reveals that the solid level in developing TMP has a greater effects than dissolved level in mixed liquor. This result also indicates that both membrane filtration to lower TMP and an appropriate agitation rate (< 400rpm) are required to minimize membrane fouling by creating a shear force near the membrane surface, in order to prevent both micro-flocs generation and cake layer formation.

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The purpose of this study was to find the optimal C/N ratio for sludge reduction and biogas production through a two-step anaerobic co-digestion process of acidogenically fermented maize stalk broth (AFMB) with sewage sludge. AFMB was prepared as follows: Crushed maize stalk were mixed with 20% (v/v) tap water. The mixture was put into a 10-L cylindrical reactor and anaerobically fermented at 100 rpm and 55 ± 2 °C without pH control (initial pH was 7.2 ± 0.3) to improve fermentation efficiency of maize stalks. The ratio of C/N was prepared to 5.32, 8.62, 12.27, 18.15, 24.43 and 30.75 using the mixing of AFMB and sewage sludge for sludge reduction and biogas production in the anaerobic co-digestion process. The highest total solid (TS) and volatile solid (VS) removal efficiency and biogas recovery was observed with C/N ratio of 18.15, which was found to be 58.13%, 67.85% and 1841.05 mL for TS, VS and biogas, respectively. Above C/N ratio of 24, the activation of microorganisms was inhibited by low pH, thereby TS, VS removal efficiency and biogas production were reduced. Therefore, in case of sludge reduction and biogas production in the anaerobic co-digestion process using AFMB, the optimum C/N ratio was recommended between 18-24. In addition, the production of biogas using AFMB in anaerobic co-digestion was determined a methane content of more than 70%, which opens the possibility of biogas production using AFMB.

KCI등재

6수중 부유물질의 임계 표면 장력에 따른 부유 선별 처리 특성에 관한 기초 연구

저자 : 한신혜 ( Shinhye Han ) , 김동수 ( Dong-su Kim )

발행기관 : 한국수처리학회(구 한국수처리기술연구회) 간행물 : 한국수처리학회지 28권 2호 발행 연도 : 2020 페이지 : pp. 53-61 (9 pages)

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Flotation has been used to separate suspended solids from aqueous environments in that it requires low installation cost and little space to perform an action, and can be automated easily. The surface features of the suspended solids have a large influence on the performance of flotation, and it is important to probe the relationship between surface features and their floating behavior in order to perform flotation effectively, which is the purpose of this research. In this work, the contact angle of subjects in the form of a sessile drop was measured to derive a Zisman plot and critical surface tension. The samples which are expected to be prevalent in aqueous systems were collected and divided into three different categories. The organic compounds including plastics (polyethylene terephthalate, polypropylene, high-density polyethylene, low-density polyethylene, polyvinyl carbonate, and polystyrene) showed high critical surface tension, and it was therefore concluded that they could be easily separated from water using the flotation method. On the contrary, the inorganic compounds such as metals (stainless steel and aluminum) and minerals (glass and pyrite) were determined to be hydrophilic, which suggested the necessity to perform a pre-treatment on these compounds to adjust the hydrophilicity of the materials. In conclusion, this research was performed to determine the colloidal state of particles and the expected risks when these particles are dispersed in aqueous environments in terms of the critical surface tension. These findings could provide a basis for further research to enhance the flotation process by determining a way to collect samples in the same conditions such as roughness, flatness, and production method.

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