• Title/Summary/Keyword: 중금속 제거

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Removal Properties of Nickel and Copper ions by Activated Carbon and Carbon Nanotube (활성탄과 카본나노튜브를 이용한 수용액상의 니켈과 구리 제거 특성)

  • Jung, Yong-Jun
    • Journal of Wetlands Research
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    • v.20 no.4
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    • pp.410-416
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    • 2018
  • This experiment was carried out with the purpose of testing nickel and copper adsorption abilities of multi wall carbon nanotube (MWCNT) and activated carbon. In the acidic condition, only MWCNT was effective for removing nickel and copper ion in the aqueous phase while activated carbon rarely remove them. The MWCNT and heavy metals adsorption reaction followed pseudo-first order kinetic. When the initial pH value was neutral (pH=7), nickel was rapidly removed by MWCNT and activated carbon in 4 hr (99.02 %, 80.30 %). Also, copper ion was rapidly removed by both adsorbents in 4 hr when the initial pH was 7 (100 %, 99.73 %). Increasing of adsorbent dosages affect the pH evolution and heavy metal ions removal (0 ~ 99%). Also, oxidation pretreatment enhanced the adsorption efficiency of MWCNT.

Adsorptive Removal Properties of Heavy Metal Ions By Soils from the Upper Banbyun Stream (반변천 상류 주변 토양의 중금속 이온 흡착제거 특성)

  • Kim, Younjung;Hwang, Haeyeon;Kim, Yunhoi;Ryu, Sanghoon;Baek, Seungcheol;Seo, Eulwon
    • Journal of the Korean GEO-environmental Society
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    • v.8 no.2
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    • pp.5-9
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    • 2007
  • This study carried out to investigate the removal capacity of heavy metals such as Cu (II), Zn (II) and Cd (II) dissolved in aqueous solution in the soils collected from Hyeon-Dong (HD), San-seong (SS), Keum-chon (KC) and Keum-Hac (KH) located in the upper Banbyun stream. The pH of all the soils was weak alkali such as 8.8 9.2. According to the analysis of chemical composition of the soils, the amount of $SiO_2$, $AlO_2$ and CaO were similar in all tested soils. However, the amount of $K_2O$, $FeO_3$ and MgO were different from each soil. The XRD measurement with these soils showed that quartz and feldspar were presented in all tested soils, and the distribution of kaoline, illite, montmorillonite, vermiculite and calcite were different from each soil. The results of the removal capacity of heavy metals indicated that all the soils had more than 98% of the removal efficiency of Cu (II), Zn (II) and Cd (II), and among the heavy metals, Cu (II) was removed the most effectively. These results suggested that the soils collected from the upper Banbyun stream have the high removal capacity of heavy metals, and these soils could be used for the banking a river around the abandoned mine area, containing the higher concentrations of heavy metals than the usual stream.

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A Study on the Treatment of Heavy Metal in Wastewater by Redox Reaction of Cu-Zn Metal Alloy and Adsorption reaction of Al-Silicate (Cu-Zn 금속합금의 산화 환원반응과 Al-Silicate의 흡착반응을 이용한 폐수 중 중금속처리에 관한 연구)

  • Lee, Soo-Jeong;Kim, Jong Hwa;Song, Ju Yeong
    • Journal of the Korean Applied Science and Technology
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    • v.33 no.3
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    • pp.441-448
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    • 2016
  • Heavy metal removal study is conducted from synthetic waste water by reduction and oxidation(redox) reaction of Cu-Zn metal alloy and adsorption reaction of aluminium silicate. Heavy metal whose ionization tendency is smaller than zinc are reducted in an aqueous solution, and the concentration of ionized zinc is reduced by adsorption reaction. The average diameter of metal alloy micro fiber is about $200{\mu}m$, and the surface area is wide enough to get equilibrium in a single cycle treatment. A single cycle treatment of redox reaction of Cu-Zn metal alloy, could remove 100.0 % of Cr(III), 98.0 % of Hg, 92.0 % of Sn and 91.4 % of Cu respectively. An ionization tendency of chromium is very close to zinc, but removal efficiency of chromium by redox reaction is significant. This result shows that trivalent chromium ion is expected to generate hydroxide precipitation with $OH^-$ ion generated by redox reaction. Zinc ion generated by redox reaction is readily removed by adsorption reaction of aluminium silicate in a single cycle treatment. Other heavy metal components which are not perfectly removed by redox reaction also showed very high removal efficiency of 98.0 % or more by adsorption reaction. Aluminium ion is not increased by adsorption reaction of aluminium silicate. That means heavy metal ion removal mechanism by adsorption reaction is turned out to be not an ion exchange reaction, but an adsorption reaction.

Suppressing Effect of Medicinal Plants on the Intestinal Absorption of Heavy Metals (생약재에 의한 중금속의 체내흡수 억제 효과)

  • Choi, Sung-Inn;Hwang, Jin-Bong;Kwon, Joong-Ho;Kim, Hyun-Ku
    • Korean Journal of Food Science and Technology
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    • v.30 no.2
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    • pp.456-460
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    • 1998
  • This research was attempted to prove suppressing effect of medicinal plants on the intestinal absorption of toxic heavy metals. In vitro study was performed by membrane filtration considering intestinal absorption conditions. From drinking water contaminated singly with 10 and 50 times level of water quality standard for heavy metals, the removal ratio of lead was $40{\sim}60%$ by Chicorium intybus, Angelica acutiloba and Ganoderma lucidium. And the removal ratio of cadmium was $20{\sim}40%$. The removal ratio of lead contaminated with both was $30{\sim}50%$ by every sample similarly, the removal ratio of cadmium was $10{\sim}30%$. The removal ratio of Angelica acutiloba was more higher than Chicorium intybus and Ganoderma lucidium. Considering the extraction conditions of samples, $70^{\circ}C$, 2 min conditions were higher than $95^{\circ}C$, 10 min conditions, the removal ratios of heavy metals were similar. And the membrane filter permeated the material under 500 mw selectively, so the final filtrate could regard as passive transport in intestinal absorption. In conclusion, this research exhibited that the medicinal plants beverages have a suppressing effect on intestinal absorption of lead and cadmium in drinking water.

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Changes in Physical Properties and Its Metal Removal Efficiency for The Yellow Soils by Calcination Process (소성처리에 의한 황토의 물성특성 변화 및 용존 중금속 제거능력)

  • Lee, Jin-Won;Kim, Seokhwi;Hwang, Gab-Soo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.4
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    • pp.584-591
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    • 2017
  • Metal removal from water has not been explained clearly by either adsorption onto the surface of absorbents or precipitation as metal hydroxides because those occur simultaneously to a certain extent. For a better understanding of the metal removal mechanisms, batch experiments were performed using soil calcined at $850^{\circ}C$ under various pH conditions for Cu, Pb, Zn, Cd, and Cr. The results showed that the metal removal efficiency with the exception of Cr decreased abruptly, even within 5 min, showing more than 90% removal. The pH of each reactant increased gradually from around 7 to 9 with time. The increases in metal removal at higher pH appear to be associated with metal hydroxides precipitation. Comparative experiments, which were carried out changing the pH by reacting with commercial activated carbon (CAC), natural yellow soil (NYS), and calcined yellow soil (CYS), showed that the pH of the CYS only increased with time. Calcination processes might lead to a change in the physical properties of the soil matrix resulting in a high pH when reacted with water. Apart from adsorption onto the surface of the absorbents, these results show that the adsorption and/or precipitation of hydroxides onto the surface of adsorbents also play important roles in regulating the dissolved metals under alkaline conditions.

A Study on Media Development for Heavy Metals Removal using Waste Bones (폐소뼈를 이용한 중금속(重金屬) 제거용(除去用) 담체개발(擔體開發)에 관한 연구(硏究))

  • Kwon, Moon-Sun;Kim, Jae-Young
    • Resources Recycling
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    • v.19 no.2
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    • pp.28-34
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    • 2010
  • In this study, cow tibial from cow bone, a kind of beef waste, sintered at $800\sim850^{\circ}C$ for three hours was used to measure its removal capacity for metal ions such as Pb, Cd and Zn in a single and a multi-component equilibrium systems. The sorption equilibrium data were analyzed as measured by the effect of media on lead, cadmium and zinc sorption. This analysis shows that the sorption of metal ions for multi-component systems applying IAST can be predicted more reasonably by the Freundlich and the Sips theory than the Langmuir.

Effect of Dye Wastewater on Heavy Metal Removal using Carboxylated Alginic Acid Bead (Carboxylated alginic acid bead를 이용한 중금속 제거에 대한 염료폐수의 영향 연구)

  • Jeon, Choong
    • Journal of the Korea Organic Resources Recycling Association
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    • v.17 no.4
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    • pp.74-80
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    • 2009
  • Effect of dye wastewater on heavy metal removal using carboxylated alginic acid bead was performed. When carboxylated alginic acid bead was used as support, effect of dye wastewater on adsorption of $Pb^{2+}$ and $Cu^{2+}$ ions was very small. Also, when $Pb^{2+}$ was coexisted with dye wastewater, adsorption process was almost completed within 2-3 hrs and $Pb^{2+}$ ions (50 ppm) was almost removed with 0.3g of bead. This result means that carboxylated alginic acid bead has effective adsorbent for heavy metal removal in dye wastewater.

A Study on the Removal of Heavy Metals from Groundwater Using Permeable Reactive Barriers Based on Nano FeS (나노 FeS를 이용한 투과성반응벽체의 중금속 오염 지하수 처리에 관한 연구)

  • Jung, Gwan-Ju;Choi, Sang-Il;Lee, Jai-Young
    • Journal of Soil and Groundwater Environment
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    • v.14 no.6
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    • pp.19-28
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    • 2009
  • The acid mine drainage (AMD) and landfill leachates released into the subsurface environment can result in serious environmental problems like soil and groundwater contamination. The AMD and the leachates of landfill were known to contain many heavy metals. In this study, the author assessed the reactivity and ability of the FeS coated-ALC for the removal of contaminants (As, Cd, Cu, Pb, Ni, Zn, Al) in AMD and leachates in landfill. The synthetic nano-FeS and Autoclaved Lightweight Concrete (ALC) were used as reactive materials in the permeable reactive barriers(PRBs). The result of batch test indicated that synthetic nano-FeS can remove 99% of heavy metals for the 1hr of reaction time except for As and Ni(about 90%). However, the 80% of As and Ni was removed in column 1(FeS coated-ALC). The column 2(Ore FeS) removed more than 99% of heavy metals. The pH of the column 1 was increased from 3.51 to 6.39~6.50, and the pH with column 2 was increased from 3.51 to 9.20. As the result of this study, the author can surmise that the synthetic nano-FeS coated ALC will use as a very good reactive material of the PRBs to treat the contaminated groundwater with AMD and leachate of landfill.

Heavy-Metal Adsorption by Recombinant Saccharomyces cerevisiae Harboring Multiple Copies of the CUP1 Gene (구리흡착 단백질 유전자를 함유하는 재조합 효모의 중금속 흡착)

  • 서진호;박상옥;김명동;한기철;전영석;안장우;한남수
    • KSBB Journal
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    • v.17 no.1
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    • pp.38-43
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    • 2002
  • Characteristics of cell growth and heavymetal adsorption by recombinant Saccharomyus cerevisiae strains harboring multiple copies of the CUP1 gene encoding metallothione (MT) protein were studied in batch cultures. Recombinant S. cerevisiae strains harboring multiple copies of the CUP1 gene were superior to the host and wild-type yeast strains in terms of cell growth and heavy metal removal, indicating that the copy number of the CUP1 gene for MT expression played an important role in the adsorption of heavy metals. It was suggested that the CUP1 promoter for the MT expression is induced by manganese and zinc as well as copper An optimum copper concentration for MT expression and concomitant adsorption of heavy metals by recombinant S. cerevisiae was found to be 0.31 mM. A nonionic surfactant Triton X-100 enhanced cell growth by 17.7% and removal of zinc by 6.1% compared with the control case.

Electrokinetic Extraction of Metals from Marine Sediment (중금속으로 오염된 해양퇴적토의 전기동력학적 정화)

  • Kim, Kyung-Jo;Yoo, Jong-Chan;Yang, Jung-Seok;Baek, Kitae
    • Korean Chemical Engineering Research
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    • v.51 no.6
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    • pp.733-738
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    • 2013
  • Sediment contains a high fraction of organic matter, high buffering capacity, and a large portion of fine grained particles such as silt and clay, which are major barriers to remove heavy metals from sediments. In this study, a lab-scale electrokinetic (EK) technique was applied to remove heavy metals effectively from marine sediment at a constant voltage gradient of 2 V/cm. A concentration of 0.1 M of ethylenediaminetetraacetic acid (EDTA), citric acid (CA), $HNO_3$, and HCl were circulated in the cathode, and tap water was circulated in the anode. CA extracted 92.4% of Ni, 96.1% of Cu, 97.1% of Zn, and 88.1% of Pb from marine sediment. A higher voltage gradient enhanced the transport of citrate and EDTA into the sediment and, therefore, increased metal extraction from the marine sediment through a complexation reaction between metals and the chelates. Based on these results, the electrokinetic process using a high voltage gradient with EDTA and CA might be useful to extract heavy metals from marine sediment.