폐콘크리트, 천연 제올라이트 및 전기화학적 공정 조합을 통한 광산폐수로부터 중금속 제거

이태룡 ( Tae-ryong Lee ),김홍태 ( Hong-tae Kim ),오상화 ( Sanghwa Oh ) 한국수처리학회(구 한국수처리기술연구회) 2018 한국수처리학회지 Vol.26 No.4

Three unit processes such as neutralization with wasted concrete (C), an electrochemical treatment (E), and an ion-exchange with natural zeolite (Z) were performed to estimate the potential for removal of heavy metals from acid mine drainage (AMD) and two combined processes consisting of C-Z-E-C reactors in series (type 1) and C-E-C-Z reactors in series (type 2) were also tested to enhance the removal efficiencies of heavy metals. Results show that heavy metals were effectively removed by precipitation at neutral pH with the aged wasted concrete and by ion exchange with the natural zeolite, but poorly removed by electrochemical treatment except Fe (64%). When it comes to enhance removal efficiencies of heavy metals, two combined processes were performed with high removal efficiencies of Fe 95.3%, Cu 96.5%, Mn 71.3%, Zn 93.7% and Al 58.2% by type 1 and Fe 94.2%, Cu 96.5%, Mn 96.3%, Zn 95.2% and Al 67.6% by Type 2, respectively.

고율하수처리를 위한 생물막여과와 분리막 연계시스템 구성

현길수 ( Kil-soo Hyun ) 한국수처리학회(구 한국수처리기술연구회) 2021 한국수처리학회지 Vol.29 No.2

Compared with the conventional MBR, granular sludge MBR due to the reactor compact design, outstanding settleability, and the ability of granules to withstand high organic loading rate has emerged with strong potential to overcome membrane fouling. The objective of this study is to configure an high-rate system using granular sludge sequencing batch reactor (GSSBR) and granular media filter (GMF) using sand and granular activated carbon (GAC)) coupled with membrane for enhancing membrane filtration performance and reducing membrane fouling in treating wastewater. As a result, GSSBR/GMF/MF configured system achieved higher efficiency than GSSBR-MBR and GSSBR/MF systems in reducing total organic carbon (TOC), total nitrogen (T-N) and total phosphorus (T-P), respectively. For transmembrane pressure (TMP), the GSSBR/GMP/MF developed much lower than that of GSSBR-MBR. In particular, the GSSBR/sand filter/MF system achieved lower TMP build-up than that of the GSSBR/GAC filter/MF system The above results indicate the GSSBR-MF coupled with GMF is more effective than conventional MBR using activated sludge in mitigating membrane fouling. The food/microorganism (F/M) ratio in the GSSBR and the biofilm growth in the GMF play an important role to reduce contaminants and TMP build-up.

과불화옥탄술폰산 제거를 위한 과황산염 기반의 산화 기술 성능 평가

박새롬 ( Saerom Park ) 한국수처리학회(구 한국수처리기술연구회) 2020 한국수처리학회지 Vol.28 No.6

Perfluorooctanesulfonic acid (PFOS), one of poly- and perfluoroalkyl acids has been receiving increasing attention from environmental scientists and public health communities due to its wide distribution, persistence, bioaccumulation, and potentially negative health impact. Research presented here focused on evaluating the effectiveness of four potential in-situ amenable technologies, based on persulfate (PS) oxidation approaches with the addition of another probing oxidant or catalysts for PFOS removal. These were the use of hydrogen peroxide with PS, Fenton reaction with PS, nano zero valent iron-activated PS, and alkali-activated PS. In this study, neither the use of hydrogen peroxide or PS oxidants were not able to decompose PFOS, but showed PFOS removal through volatilization. Similarly, Fenton reaction with PS also showed PFOS volatilization due to exothermic reaction. Nano zero valent iron-activated PS also showed PFOS removal, due to its adsorption onto the surface of zero valent iron, but not due to decomposition. Lastly, alkali-activated PS did not induce PFOS attack by the diverse radicals generated such as sulfate, hydroxyl and oxygen radicals. The four types of PS-based oxidation technologies assessed here failed to decompose PFOS by oxidation. However, they showed PFOS removal due to volatilization or adsorption.

미생물 성장 저해 조건에 따른 호흡률 변화 특성

김성필 ( Sung Pil Kim ),윤수연 ( Su Yeon Yun ),김연권 ( Youn Kwon Kim ) 한국수처리학회(구 한국수처리기술연구회) 2017 한국수처리학회지 Vol.25 No.5

The supply of sewage treatment facility in rural areas is important to protect the quality of water sources such as rivers and lakes. A small scale wastewater treatment system had a wide range of inflow concentration. Therefore, it is important to accurately identify the characteristics of the influent and respond properly to operate the system stably. Hence, research has been conducted on methods to detect and respond in advance to the influent sewage. The method includes studying of microbial respiration rate. In this study, we analyzed the respiration rate of activated sludge in the condition that the microorganism became autocatalytically oxidized under an empty load condition, and the sewage containing the toxic substance(NaOCl) was the biggest problem of the distributed small-scale sewage treatment plant(D-SSTP). Oxygen Uptake Rate (OUR), Specific Oxygen Utilization Rate (SOUR_Endo.), and Specific Substrate Utilization Rate (SSUR) were measured and analyzed. As a result, The concentration of DO did not affect the autocatalytic oxidation of microorganism. Moreover, as concentration of NaOCl increased, concentration of SOUR_Endo tends to decrease as expected. Also, the increase in concentration of NaOCl resulted in the decrease in that of the SSUR. It is determined that NaOCl injection affects the microbial activity.

메조 세공 제올라이트 Y가 코팅 된 알루미나 중공사막을 이용한 중금속 흡착

박서현 ( Seo-hyun Pak ),박정훈 ( Jung Hoon Park ),박찬규 ( Chan-gyu Park ) 한국수처리학회(구 한국수처리기술연구회) 2021 한국수처리학회지 Vol.29 No.2

In this study, mesoporous-zeolite-Y-coated alumina hollow fiber membranes were prepared by optimizing the synthesis conditions and using commercial zeolite Y, CTAB, as the structure-directing agent and alumina hollow fiber membranes. The removal of heavy metals was investigated using these membranes. The synthesized membranes were characterized with X-ray diffraction, field emission scanning electron microscopy, nitrogen adsorption-desorption analysis, field emission transmission electron microscopy, Fourier transform infrared spectroscopy, and the heavy metal adsorption activity of these membranes was investigated with ultraviolet-visible spectroscopy. Batch tests were conducted to investigate the capabilities of the mesoporous-zeolite-Y-coated membranes in removing Mn (II) and Fe (II)fromaqueoussolutions.Nitrogen full isotherm analyses confirmed that the synthesized mesoporous adsorbents were homogenously mesoporous. These results suggest that the mesoporous-zeolite-Y-coated membranes exhibited higher adsorption capacity than that of the alumina hollow fiber membranes. After three runs of heavy metal adsorption, there was no drop in the activity of the prepared mesoporous-zeolite-Y-coated alumina hollow fiber membranes because they were easier to separate and more durable than the conventional powdered adsorbents.

고속생물여과를 위한 모래 : 입장활성탄 여과법의 개발

연구회자료 한국수처리기술연구회 1994 한국수처리학회지 Vol.2 No.2

낙동강 회생 및 맛있는 수돗물 생산을 위한 물처리 기술대책

강용태 한국수처리기술연구회 1999 한국수처리학회지 Vol.7 No.1

LCA의 개요와 수처리시스템의 적용

岡崎春雄,府中 裕一 한국수처리기술연구회 2002 한국수처리학회지 Vol.10 No.1

영국의 하수 처리수의 재이용 실태

Anderson, G . Kenneth 한국수처리기술연구회 1995 한국수처리학회지 Vol.3 No.4

일반적으로 도시의 공공용수는 음용수 수질조건에 적합한 처리를 행한 후 공급한다. 그러나 이러한 수도수는 공공용수중 생활용수나 공업용수에만 적절하게 일부 사용되지만 그 외의 잡용수로는 수도수의 수질을 필요로 하지 않는다. 본 논문에서는 이러한 잡용수에 필요한 수질기준을 마련하고, 하수의 재생수를 잡용수로서 이용하는 방안을 조사하였다. 하수의 재생수는 대채로 도시유지용수, 공업용수, 농업용수, 여가용수, 생태계 보호용수 그리고 지하수 재충전용수로서 사용되기도 한다. 하수의 재이용을 위한 처리방법의 개발은 생활하수와 산업폐수처리장을 대상으로 조사하였다. 특히 연구 대상 처리방법들은 오염 영양원의 제거기술, 막분리 시스템 그리고 갈대층에 의한 처리기술등 이었다. Urban public water supplies are generally treated to satisfiy the requirements for potable use. However, potable use represents only a small friction of the total domastic and industrial use of treated potable water, the remaining fraction may not require water of potable quality. This paper will identify the requirements for non-potable water quality criteria and examine oppertunities for substituting reclaimed water. Specific water use categories where re-use potential exist include; urban, industrial, agricultural, recreational, habitat restoration and groundwater re-charge. Current methods of wastewater treatment for re-use will be discussed for both urban and industrial wastewater treatment plants. In particular, reference will be made to nutrient removal, membrane systems and reed bed technology. Examples of wastewater re-use systems will be given in order to highlight the methods refered to.

좌표계 변환 및 비등방성 통계학적 기법을 활용한 하천지형 공간보간법 연구

심규현 ( Gyu-hyun Shim ),이병준 ( Byung-joon Lee ) 한국수처리학회(구 한국수처리기술연구회) 2017 한국수처리학회지 Vol.25 No.4

The recent river environment, vulnerable to extreme climate change, induces the use of 2, 3-dimensional hydrodynamic models to simulate river flow in extreme events like flood and drought. The simulation quality of such a multi-dimensional hydrodynamic model depends primarily on the morphology/topology of the river bed. Because the number of measured bathymetry data are not enough, a spatial interpolation method should be used to predict the river bed morphology/topography. Most of the current spatial interpolation methods however are isotropic, disregarding the river flow direction. Therefore, in this study, anisotrophic spatial interpolation methods were evaluated for their capability of predicting the river bed morphology/topology. Especially, the interpolation methods of inverse distance weighting, spline and kriging, combined with coordinate transformation from XY cartesian to SN curvilinear coordinates, were evaluated for their capability. Among them, the anisotrophic ordinary kriging with XY-to-SN coordinate transformation was proven the most accurate and reliable interpolation method for predicting the river bed morphology/topology. This state-of-the-art spatial interpolation method will help better prediction of the river bed morphology/topology and the 2, 3-dimensional hydrodynamics.