탄화 정수 슬러지를 이용한 수중의 납과 카드뮴 흡착에 관한 연구

김연정,김대익,최종하,홍용표,유건상,Kim, Younjung,Kim, Daeik,Choi, Jong-Ha,Hong, Yong Pyo,Ryoo, Keon Sang 대한화학회 2017 대한화학회지 Vol.61 No.5

본 연구에서, 400도에서 탄화시킨 정수 슬러지를 수중의 납과 카드뮴의 제거를 위한 흡착제로서 시험하였다. 탄화된 슬러지는 열중량 분석, 주사 전자 현미경, X-선 형광분광기, 표면적 분석에 의해 특성화 하였다. 탄화 슬러지는 정수 슬러지 자체보다도 대단히 높은 비표면적과 총 세공부피를 나타내었다. 회분식 흡착 과정에서 탄화 슬러지는 카드뮴보다는 납에 대하여 더 나은 흡착성능을 보였으며, 실험에서 행한 농도에서 90~98%의 흡착 능력을 달성하였다. 흡착의 평형 데이터는 Freundlich와 Langmuir와 흡착등온선 모델을 이용하여 평가하였고, Freundlich와 Langmuir 흡착 등온선 둘 다 0.95보다 큰 상관계수($R^2$) 값을 나타내었다. 연구의 결과들은 열처리 된 탄화 정수 슬러지가 수중으로부터 납과 카드뮴을 제거하는데 효율적인 흡착제로 사용될 수 있다는 것을 보였다. In this study, water treatment sludge carbonized with $400^{\circ}C$ was tested as an adsorbent for the removal of Pb and Cd in water. The carbonized sludge was characterized by thermo-gravimetric analysis (TGA), scanning electron microscopy (SEM), X-ray fluorescence spectrometry (XRF), and surface area analysis. Carbonized sludge exhibited much higher specific surface area and total pore volume than water treatment sludge itself. In batch-type adsorption process, carbonized sludge represented better adsorption performance for Pb than Cd, achieving 90~98% at the concentrations conducted in the experiments. Equilibrium data of adsorption were analyzed using the Freundlich and Langmuir isotherm models. It was seen that both Freundlich and Langmuir isotherms have correlation coefficient $R^2$ value larger than 0.95. The results of studies indicated that carbonized water treatment sludge by heat treatment could be used as an efficient adsorbent for the removal of Pb and Cd from water.

우사의 깔짚과 퇴비에 있는 질소와 인의 형태적 변화와 저감 방안에 관한 연구

김연정,유건상,Kim, Younjung,Ryoo, Keon Sang 대한화학회 2021 대한화학회지 Vol.65 No.4

안동에 있는 한 가축 농가의 우사에서 깔짚과 퇴비를 채취하였다. 이들 시료로부터 질소(N)와 인(P)의 성상의 변화를 조사하고 이들을 유용하고 현실적으로 제거할 수 있는 방안을 제시하고자 하였다. 시료의 조성 및 그 함량은 X-선 형광 분석기(XRF)로 확인하였다. 시료에서 용출되어 나오는 아질산성질소(NO₂^-), 질산성 질소(NO₃^-), 인산이온(PO₄^3-)들은 이온 크로마토그래프로, 암모니아성 질소(NH₄⁺), 총인(T-P), 총질소(T-N)는 자외선/가시광선 분광기를 이용하여 분석하였다. 연구의 결과로서, 소의 배설물 초기 상태에 있는 암모니아성 질소는 pH를 상승시켜 바로 휘발시킬 수 있는 암모니아 가스 상태로 만들 필요성이 있다. 녹조류 증식의 주요 영양원인 질소와 인은 퇴비의 발효를 촉진시킨 후 칼슘(Ca)과 마그네슘(Mg)을 첨가하여 인은 인산칼슘(CaHPO₄·3H₂O), 질소는 스투루바이트(NH₄MgPO₄·6H₂O) 형태의 난용성염을 생성 시킴으로서 제거 할 수 있다. Litter and manure were obtained at a cow house of a livestock farm in Andondg city. We examined the change of formation of nitrogen and phosphorous from these samples and tried to suggest a more useful and realistic way for removing them. Constituent and its content of sample were identified by XRF. NO₂^-, NO₃^-, and PO₄^3- ions and NH₄⁺, T-P and T-N released from sample were analyzed using ion chromatograph and UV/Vis spectrometry, respectively. As the results of this study, the ammonia nitrogen in the early stage of cow excretion is a need to make an ammonia gas state that can be immediately volatile by increasing the pH. Nitrogen and phosphorous, the main source of nutrition in green algal bloom can be removed by transforming insoluble salts such as calcium phosphate (CaHPO₄·3H₂O) and struvite (NH₄MgPO₄·6H₂O), respectively, with addition of Ca and Mg after stimulating fermentation of manure.

정수장 슬러지 농축조 배출수의 망간 농도에 미치는 pH의 영향

김연정(Younjung Kim),이승은(Seungeun Lee),백승철(Seungcheol Baek),김태희(Taeheui Kim) 한국지반환경공학회 2015 한국지반환경공학회논문집 Vol.16 No.5

정수공정 중에 응집된 망간은 슬러지 농축조에 체류하는 동안 재용출 되어 배출수의 망간 허용기준치를 초과하는 문제가 발생되고 있다. 본 연구에서는 정수공정 중에 슬러지 농축조 배출수의 pH를 조정함으로써 망간 농도에 미치는 pH의 영향에 대하여 연구하였다. 초기 pH 6.1에서는 응집된 슬러지로부터 망간이 재용출 되어 청정지역 배출 기준인 2mg/L를 초과하였으나 NaOH, KOH, CaO, Ca(OH)₂, CaCO₃ 등 알칼리 물질을 이용하여 pH를 상승시켰을 경우 망간 농도를 청정지역 배출 기준 이하로 낮출 수 있었다. 또한 알칼리성 물질로서 석회석 광산에서 선별과정 중 발생하는 폐석회석을 이용하여 정수장 슬러지의 망간 재용출을 억제할 수 있는 가능성을 확인하였다. Manganese in sludge precipitated during water treatment might be soluble again in effluent from sludge thickener. If that happens, the manganese concentration of effluent from water treatment plant will exceed the limit for clean reservation. In this study the influence of pH on Mn concentration of effluent from sludge thickener of water treatment plant was investigated. When the pHs of sludge solutions increased with alkaline materials such as NaOH, KOH, CaO, Ca(OH)₂, CaCO₃, the Mn concentrations of sludge solutions decreased under the limit. The Mn concentration of effluent from sludge thickener could be controlled with waste limestones from beneficiation process at limestone mine as an alkaline material.

ASME Section XI에 따른 결함 허용성 평가 사례 연구

박홍선(Hongsun Park),김승현(Seunghyun Kim),김연정(Younjung Kim),김종수(Jongsoo Kim),강선예(Sunyeh Kang),김종민(Jongmin Kim) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12

안동ㆍ임하호 저니토의 토양 성분과 중금속 용출 특성

서을원(Seo Eulwon),김연정(Kim Younjung),백승철(Baek Seungcheol) 한국지반환경공학회 2008 한국지반환경공학회논문집 Vol.9 No.4

본 연구는 안동지역에 소재하는 안동 임하호 저니토가 호소수에 미치는 영향을 조사하기 위하여 안동호와 임하호 6개 지역에서 채취한 저니토의 토양성분과 중금속 용출 특성을 분석하였다. 대부분의 저니토는 illite(I), kaolinite(Ka), quartz(Q) 및 feldspar(F)로 구성되어 있다. 저니토에 포함된 중금속 중 아연(Zn), 비소(As), 크롬(Cr), 구리(Cu), 납(Pb)의 농도는 임하호에 비하여 안동호에서 상대적으로 높게 나타났다. 특히 안동호의 저니토에서는 다른 중금속들에 비해 비소 (As)와 아연(Zn)의 용출이 크게 나타났다. 저니토를 이용한 흡착실험에서는 아연(Zn), 카드늄(Cd) 및 구리(Cu)의 흡착은 적게 일어난 반면 납(Pb)과 크롬(Cr)은 높은 흡착력을 보여주었다. In this study, it was analyzed the soil components and elution characteristics of heavy metal ions in sediment samples to examine the effect of sediments embedded in Andong and Imha reservoirs on water quality. Major elements of sediments were shown to be Al, Si, K, and Fe by EDS analysis and major soil components of the collected 6 different sediments were illite (I), kaolinite (Ka), quartz (Q) and feldspar (F). And especially quartz took up a considerable part of sediments by XRD analysis. The total concentrations of Zn, As, Cr, Cu and Pb in sediments of Andong reservoir were relatively higher than those of Imha reservoir. The elution property of heavy metal from sediments had various aspects according to pH. Among the heavy metals in Andong reservoir sediments, As and Zn were significantly eluted at pH 6 compared with the other heavy metals. In the case of the adsorption tests using the sediments, the adsorptive capacities of Zn, Cd and Cu were very weak, on the while those of Pb and Cr were high.

상류 낙동 강변의 광미 내 중금속 오염현황

홍용표 ( Yong Pyo Hong ),최종하 ( Jong-ha Choi ),김연정 ( Younjung Kim ),김대익 ( Dae-ik Kim ),유건상 ( Keon Sang Ryoo ) 한국환경분석학회 2016 환경분석과 독성보건 Vol.19 No.3

Ore powder had been cumulated at a moderate incline along the upper Nakdong Riverside by the natural disaster such as a flood from mines and smelting factories between 1940 and 1970. This study investigates the surface and deep layer mine tailings and the neighboring soil at 7 sites in the upper Nakdong River System. The study analyzed the sites between 2014 and 2015 for the presence of eight heavy metals (Cd, Pb, As, Cr(VI), Hg, Zn, Cu, Mn), Generally, the content of heavy metals increased in order from the contrast soil, the deep layer mine tailings, to the surface layer mine tailings. Consequently, it was concluded that the upper region of the Nakdong Riverside requires the remediation in the near future in order to remove the mine tailings.

Modulation of Chelidonii herba on GABA Activated Chloride Current in Rat PAG Neurons

Kim, Younjung,Shin, Minchul,Chung, Jooho,Kim, Eehwa,Koo, Gyosung,Lee, Choongyeol,Kim, Changju 경희대학교 동서의학연구소 2001 東西醫學硏究所 論文集 Vol.2001 No.-

Modulation of Chelidonii herba on γ-aminobutyric acid(GABA) activated chloride current in the acutely dissociated periaqueductal gray (PAG) neuron was studied by nystatin-perforated patch-clamp technique. High concentrations of Chelidonii herba elicited ion current, that was blocked by bicuculline. Low concentrations reduced the GABA activated current in PAG. Two types of inhibitory action of Chelidonii herba on GABA activated current have been implicated in PAG. One is the inhibitory action of Chelidonii herba on GABA was abolished by naltrexone and the other is that of Chelidonii herba was potentiated by naltrexone. In addition, all of two types of action of Chelidonii herba are linked to pertussis toxin=sensitive GTP-binding proteins. These results suggest that the inhibitory modulation of Chelidonii herba on GABA activated current via G-proteins in PAG neuron in an important analgesic mechanism.

지구성 운동이 중추신경제 세로토닌과 TH 발현에 미치는 영향

공선아,유승희,임백빈,김연정,정주호,김홍,김영표,김성수,김창주 대한스포츠의학회 2000 대한스포츠의학회지 Vol.18 No.2

The purpose of this study was to investigate the effects of aerobic exercise training on serotonin and TH expression in CNS of rats. The 28 Sprague-Dawle rats of 200-300g were used and were divided into four groups: 1 week control group and 4 weeks control group which lead a sedentary life during the whole training period, and 1 week exercise group with 30 min treadmill training five times per a eek for 1 week and 4 weeks exercise group with 30 min exercise five times per week for four weeks. After treadmill training, each group was fixated with PFA and 40㎛ thickness slices was made by cryostat. To evaluate the effect of aerobic exercise on serotonin and TH(tyrosine hydroxylase) expression, immunohistochemistry technique was performed. The result of the study were as followed: 1. Serotonin expression of 1 week exercise group was significantly increased in dorsal raphe(P<.001). Serotonin expression of 4 weeks exercise group was significantly decreases in dorsal raphe(P<.001). 2. Serotonin expression of 1 week exercise group was significantly increased in raphe magnus(P<.001). Serotonin expression of 4 weeks exercise group was significantly increased in raphe magnus(P<.001). 3. TH expression of 1 week exercise group was significantly increased in substantia.