• Title/Summary/Keyword: heavy metal removal

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Continuous removal of heavy metals by coupling a microbial fuel cell and a microbial electrolytic cell

  • Xie, Guo R.;Choi, Chan S.;Lim, Bong S.;Chu, Shao X.
    • Membrane and Water Treatment
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    • v.11 no.4
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    • pp.283-294
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    • 2020
  • This work aims at studying the feasibility of continuous removal of mixed heavy metal ions from simulated zinc plating wastewaters by coupling a microbial fuel cell and a microbial electrolysis cell in batch and continuous modes. The discharging voltage of MFC increased initially from 0.4621 ± 0.0005 V to 0.4864 ± 0.0006 V as the initial concentration of Cr6+ increased from 10 ppm to 60 ppm. Almost complete removal of Cr6+ and low removal of Cu2+ occurred in MFC of the MFC-MEC-coupled system after 8 hours under the batch mode; removal efficiencies (REs) of Cr6+ and Cu2+ were 99.76% and 30.49%. After the same reaction time, REs of nickel and zinc ions were 55.15% and 76.21% in its MEC. Cu2+, Ni2+, and Zn2+ removal efficiencies of 54.98%, 30.63%, 55.04%, and 75.35% were achieved in the effluent within optimum HRT of 2 hours under the continuous mode. The incomplete removal of Cu2+, Ni2+ and Zn2+ ions in the effluent was due to the fact that the Cr6+ was almost completely consumed at the end of MFC reaction. After HRT of 12 hours, at the different sampling locations, Cr6+ and Cu2+ removal efficiencies in the cathodic chamber of MFC were 89.95% and 34.69%, respectively. 94.58%, 33.95%, 56.57%, and 75.76% were achieved for Cr6+, Cu2+, Ni2+ and Zn2+ in the cathodic chamber of MEC. It can be concluded that those metal ions can be removed completely by repeatedly passing high concentration of Cr6+ through the cathode chamber of MFC of the MFC-MEC-coupled system.

The Adsorption Properties of Heavy Metal Ions on to Cotton Fabrics Treated with Reactive Anionic Agent (반응형 음이온화제 처리 면직물에 대한 중금속 이온의 흡착특성)

  • Kim Mi-Kyung;Yoon Seok-Han;Kim Tae-Kyeong;Lim Yong-Jin
    • Textile Coloration and Finishing
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    • v.17 no.1
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    • pp.20-29
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    • 2005
  • Cotton fabric was treated with a reactive anionic agent in order to have anionic sites(-S03-) on it, which made it possible for the fabric to adsorb various cationic materials. In this study, the adsorptivity of various heavy metal ions such as Pb(II), Cd(II), Cr(III), Co(II), Cu(II), Ni (II) and Cr(VI) on the cotton fabrics treated with anionic agent was examined at the various conditions; concentrations of heavy metal ions, pHs of solution, reaction time and temperature. As a result, the adsorptivity of the heavy metal ions on the cotton fabrics treated with the anionic agent was highly increased comparing to that of untreated cotton fabrics. The order of the adsorptivity was as follows: $Pb(II)>Cd(II)>Cu(II)\geqNi(II)\geqCo(II)>Cr(III)\ggCr(VI)$. The adsorption amounts of most heavy metal ions were increased in weak alkaline conditions and were reached to an adsorption equilibrium within 10 ~ 30 minutes. The maximum adsorption ratios of Pb(II) and Cd(II) were respectively 99% and 80% of the initial concentration of heavy metal ions. Therefore the anionized cotton fabrics seem to be utilized as an adsorption fabrics for the removal of heavy metal ions in the waste water.

Effect of Two-step Surface Modification of Activated Carbon on the Adsorption Characteristics of Metal Ions in Wastewater II. Dynamic Adsorption

  • Lee, Jae-Kwang;Park, Geun-Il;Ryu, Seung-Kon;Ki, Joon-Hyung
    • Carbon letters
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    • v.4 no.1
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    • pp.14-20
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    • 2003
  • Based on the previous results of the equilibrium and batch adsorptions, the removal efficiency of the two-step surface-modified activated carbon ($2^{nd}AC$) for heavy metal ions such as Pb, Cd, and Cr in fixed column was evaluated by comparing with that of the as-received activated carbon (AC) and the first surface-modified activated carbon ($1^{st}AC$). The order of metal removal efficiency was found as $2^{nd}AC$ > $1^{st}AC$ $\gg$ AC, and the efficiency of the $2^{nd}AC$ maintained over 98% from the each metal solution. Increase of the removal efficiency by the second surface modification was contributed to maintain favorable pH condition of bulk solution during adsorption process. The removal of the heavy metals on the $2^{nd}AC$ was selective with Pb being removed in preference to Cr and Cd in multicomponent solutions and slightly influenced by phenol as the organic material.

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Development of a Microbe-Zeolite Carrier for the Effective Elimination of Heavy Metals from Seawater

  • Kim, In Hwa;Choi, Jin-Ha;Joo, Jeong Ock;Kim, Young-Kee;Choi, Jeong-Woo;Oh, Byung-Keun
    • Journal of Microbiology and Biotechnology
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    • v.25 no.9
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    • pp.1542-1546
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    • 2015
  • The purpose of this study was to investigate the potential of zeolite-supported sulfatereducing bacteria (SRB) in enhancing the removal of Cu2+, Ni2+, and Cr6+ in contaminated seawater. Our results show that SRB-immobilized zeolite carriers can enhance the removal of heavy metals. In addition, heavy metals were generally better removed at conditions of 37°C. Cu2+, Ni2+, and Cr6+ were effectively removed by 98.2%, 90.1%, and 99.8% at 100 parts per million concentration of the heavy metals, respectively. These results indicate that SRB-zeolite carriers hold great potential for use in the removal of cationic heavy metal species from marine environment.

Mineralogical Properties and Heavy Metal Removal Efficiency of Shells (패각의 광물학적 특성 및 중금속 제거 효율 평가)

  • Song, Hye Won;Kim, Jae Min;Kim, Young Hun;Kim, Jeong Jin
    • Korean Journal of Mineralogy and Petrology
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    • v.35 no.3
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    • pp.387-396
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    • 2022
  • In this study, the removal efficiencies of heavy metals were evaluated using cockle, abalone, and scallop shells. Cockle, abalone, and scallop are composed mainly of aragonite, aragonite, and calcite, and calcite, respectively. The specific surface area of each shell varies from 2.7241 m2/g to 4.5481 m2/g and the order of that is scallop > abalone > cockle. All shells of cockle, abalone, and scallop had no As removal effect by adsorption and precipitation as pH increased. Pb was removed by all shell samples at initial reaction. Although the removal efficiency of Cd and Zn were depending on the reaction medium, that was increased in order of scallop > abalone > cockle. Heavy metal removal efficiency tends to be slightly higher for heated samples than with the raw materials, and higher as the specific surface area is larger.

Evaluation of Heavy Metal Removal Efficiency in Artificial Acidic Drainage Using Calcite and Aragonite (방해석과 아라고나이트를 이용한 인공산성배수의 중금속 제거 효율 평가)

  • Byeong Cheol Song;Young Hun Kim;Jeong Jin Kim
    • Economic and Environmental Geology
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    • v.57 no.3
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    • pp.319-327
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    • 2024
  • Calcite and aragonite are polymorphs with the chemical formula CaCO3. In this study, natural limestone and aragonite, as well as scallop and clam shells composed of calcite and aragonite, were used as the pH-raising neutralizing agents for model solutions containing various heavy metals such as Cd, Cu, Fe, Mn, and Zn to simulate acidic drainage. According to the experimental results, pH-raising effect is higher in the shell materials compared to natural ores for both the calcite and aragonite types. Natural calcite and scallop shells are found to be the most suitable media for Cd removal, while over 95% efficiency for Cu and Fe removal was observed in all four media. Zn removal efficiency is higher in aragonite and clam shells, while Mn removal efficiency is relatively low, to be below 50%, for all four media. Overall, the heavy metal removal efficiency, except for Mn, was over 90%, in the order of Fe > Cu > Cd > Zn > Mn.

산업부산물을 이용한 중금속 제거효율에 관한 연구

  • 권용삼;이기호;박준범;이상훈;박종범
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2003.09a
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    • pp.431-434
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    • 2003
  • Environmental pollution problems due to the wastes from various industrial facilities and activities have become a serious issue. The specific problem associated with heavy metals in the environment is their accumulation in the food chain and their persistence in nature. Present work investigates the possible uses of by-products for the removal of heavy metal ions. Heavy metals used in these studies were cadmium, lead and copper. Experiments were conducted with by-products such as oyster shell and fly ash to evaluate their sorption characteristics. The results of the study indicate that oyster shell can be properly used as an adsorbent for heavy metals because of its outstanding removal rate.

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Removal, Recovery, and Process Development of Heavy Metal by Immobilized Biomass Methods (미생물 고정화법에 의한 중금속 제거, 회수 및 공정개발)

  • Ahn, Kab-Hwan;Shin, Yong-Kook;Suh, Kuen-Hack
    • Journal of Environmental Science International
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    • v.6 no.1
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    • pp.61-67
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    • 1997
  • Heavy metal adsorption by microbial cells is an alternative to conventional methods of heavy metal removal and recovery from metal-bearing wastewater The waste Sac-chuomyces cerevisiae is an inexpensive, relatively available source of biomass for heavy metal biosorption. Biosorption was investigated by free and immobilized-S. cerevisiae. The order of biosorption capacity was Pb>Cu>Cd with batch system. The biosorption parameters had been determined for Pb with free , cells according to the Freundlich and Langmuir model. It was found that the data fitted reasonably well to the Freundlich model. The selective uptake of immobilized-S. cerevisiae was observed when all the metal ions were dissolved in a mixed metals solution(Pb, Cu, Cr and Cd). The biosorption of mixed metals solution by immobilized-cell was studied in packed bed reactor. The Pb uptake was Investigated in particular, as it represents one of the most widely distributed heavy metals in water. We also tested the desorption of Pb from immobilized-cell by us- ing HCI, $H_2SO_4$ and EDTA.

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Studies on Cadmium and Zinc Detoxification of Rumex maritimus (금소리쟁이(Rumex maritimus)의 카드뮴, 아연 내성에 관한 연구)

  • 김진희;이인숙
    • The Korean Journal of Ecology
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    • v.21 no.3
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    • pp.225-231
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    • 1998
  • The studies on the potentiality of biomonitoring heavy metal pollution in coastal region of industrial complex were performed to investigate the heavy metal accumulation and induction of metal-binding protein (MBP) as detoxification process using Rumex maritimus. Bioconcentration in organs and MBP in root of R. maritimus was investigated for the research of the tolerance of heavy metals. The bioconcentration of cadmium and zinc in organs showed 3.6-8.0 times in root higher than in shoot, so it was found that heavy metal accumulated selectively in root. MBP increased absorbance in 254 nm and decreased in 280 nm, because it was composed of high cystein content and low aromatic acids, so absorbance had large difference between 254 nm and 280 nm. The existence of MBP in the 10-20 fraction was ascertained with anion exchange chromatography and it was identified that concentration of heavy metal increased according as an exposure concentration of medium increased in QAE Sephadex A-25 elution profile. These results suggested that MBP could play a role in biomarker determining the bioconcentration of plant. This study demonstrated a possibility that removal ability of heavy metal of R. maritimus resulted from detoxification process and MBP could be utilized as a biomarker of heavy metal pollution.

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초음파동전기세척 복합기법에 의한 오염부지 복원기술

  • 정하익;김상근;송봉준;강동우;이경국
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2004.04a
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    • pp.183-185
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    • 2004
  • In this study, the combined electrokinetic and ultrasonic remediation technique, ultrasonically enhanced electrokinetic technique, was studied for the removal of heavy metal and organic substance in contaminated soils. The electrokinetic technique has been applied to remove mainly the heavy metal and the ultrasonic technique has been to remove mainly organic substance in contaminated soil. The laboratory soil flushing tests combined electrokinetic and ultrasonic technique were conducted using specially designed and fabricated devices to determine the effect of these both techniques. A series of laboratory experiments involving the simple, electrokinetic, ultrasonic, and electrokinetic & ultrasonic flushing test were carried out. A soil admixed with sand and kaolin was used as a test specimen, and Pb and ethylene glycol were used as contaminants of heavy metal and organic substance. An increase in out flow, permeability and contaminant removal rate was observed in electrokinetic and ultrasonic flushing tests. Some practical implications of these results are discussed in terms of technical feasibility of in situ implementation of electrokinetic ultrasonic remediation technique.

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