The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Donghee Park - One of the best experts on this subject based on the ideXlab platform.
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biosorption process for treatment of electroplating wastewater containing cr vi laboratory scale Feasibility Test
Industrial & Engineering Chemistry Research, 2006Co-Authors: Donghee Park, Yeoungsang Yun, Jong Moon ParkAbstract:Brown seaweed Ecklonia biomass was used for the treatment of electroplating wastewater that contains chromium and zinc ions. Batch experiments showed that Cr(VI) was removed from the wastewater through reduction to Cr(III) by contact with the biomass, whereas Cr(III) and Zn(II) were removed through adsorption to the binding sites of the biomass. Among various parameters, the solution pH most significantly affected the biosorptive capacity of the biomass. As the solution pH increased, the removal efficiency of Cr(VI) decreased, whereas that of Cr(III) and Zn(II) increased, for pH <5. This divergence of efficiency, because of the removal mechanisms of chromium and zinc ions, necessitated a two-stage biosorption process for the complete removal of both ions from the wastewater. The first stage comprises the removal of Cr(VI) by reduction into Cr(III) and of total chromium by partial adsorption at a low pH (1.5-2.5), and the second stage the removal of residual total chromium and Zn(II) by adsorption at elevated pH (4-5). A series of two columns that contain the Ecklonia biomass with a pH adjustment step between column operations was successfully used as a Feasibility Test of the proposed process. In conclusion, the abundant and inexpensive Ecklonia biomass can be used in the two-stage biosorption process for the treatment of electroplating wastewater that contains Cr(VI) and other metal ions, because it shows the promise of being environmentally friendlier than any existing chemical treatment process.
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Metal recovery from electroplating wastewater using acidophilic iron oxidizing bacteria : pilot-scale Feasibility Test
Industrial & Engineering Chemistry Research, 2005Co-Authors: Donghee Park, Ikuo Jitsuhara, Sung Kook Park, Osamu Miki, Hee Dong Chun, Dae Sung Lee, Jong Moon Park, Toshiaki KatoAbstract:Wastewater from electroplating plants contains several valuable metallic ions such as iron, nickel, and zinc. In general, neutralization followed by sedimentation has been used for the treatment of electroplating wastewater because of low treatment cost and high stability of treated water quality. However, this method results in the production of large amounts of heavy metal sludge that may cause secondary pollution and additional cost. In addition, the recovery of valuable metallic contents from the wastewater sludge has not been technically feasible. It would be highly desirable economically as well as environmentally if a metal recovery process from the wastewater is developed. In the present work, we developed a biological process for metal recovery from electroplating wastewater. Wastewater from electroplating plants contains iron in the form of ferrous ion together with other metal ions. To add economic value to the chemical sludge, iron should be separated from other metals such as nickel and zinc ...
Jong Moon Park - One of the best experts on this subject based on the ideXlab platform.
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biosorption process for treatment of electroplating wastewater containing cr vi laboratory scale Feasibility Test
Industrial & Engineering Chemistry Research, 2006Co-Authors: Donghee Park, Yeoungsang Yun, Jong Moon ParkAbstract:Brown seaweed Ecklonia biomass was used for the treatment of electroplating wastewater that contains chromium and zinc ions. Batch experiments showed that Cr(VI) was removed from the wastewater through reduction to Cr(III) by contact with the biomass, whereas Cr(III) and Zn(II) were removed through adsorption to the binding sites of the biomass. Among various parameters, the solution pH most significantly affected the biosorptive capacity of the biomass. As the solution pH increased, the removal efficiency of Cr(VI) decreased, whereas that of Cr(III) and Zn(II) increased, for pH <5. This divergence of efficiency, because of the removal mechanisms of chromium and zinc ions, necessitated a two-stage biosorption process for the complete removal of both ions from the wastewater. The first stage comprises the removal of Cr(VI) by reduction into Cr(III) and of total chromium by partial adsorption at a low pH (1.5-2.5), and the second stage the removal of residual total chromium and Zn(II) by adsorption at elevated pH (4-5). A series of two columns that contain the Ecklonia biomass with a pH adjustment step between column operations was successfully used as a Feasibility Test of the proposed process. In conclusion, the abundant and inexpensive Ecklonia biomass can be used in the two-stage biosorption process for the treatment of electroplating wastewater that contains Cr(VI) and other metal ions, because it shows the promise of being environmentally friendlier than any existing chemical treatment process.
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Metal recovery from electroplating wastewater using acidophilic iron oxidizing bacteria : pilot-scale Feasibility Test
Industrial & Engineering Chemistry Research, 2005Co-Authors: Donghee Park, Ikuo Jitsuhara, Sung Kook Park, Osamu Miki, Hee Dong Chun, Dae Sung Lee, Jong Moon Park, Toshiaki KatoAbstract:Wastewater from electroplating plants contains several valuable metallic ions such as iron, nickel, and zinc. In general, neutralization followed by sedimentation has been used for the treatment of electroplating wastewater because of low treatment cost and high stability of treated water quality. However, this method results in the production of large amounts of heavy metal sludge that may cause secondary pollution and additional cost. In addition, the recovery of valuable metallic contents from the wastewater sludge has not been technically feasible. It would be highly desirable economically as well as environmentally if a metal recovery process from the wastewater is developed. In the present work, we developed a biological process for metal recovery from electroplating wastewater. Wastewater from electroplating plants contains iron in the form of ferrous ion together with other metal ions. To add economic value to the chemical sludge, iron should be separated from other metals such as nickel and zinc ...
Toshiaki Kato - One of the best experts on this subject based on the ideXlab platform.
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Metal recovery from electroplating wastewater using acidophilic iron oxidizing bacteria : pilot-scale Feasibility Test
Industrial & Engineering Chemistry Research, 2005Co-Authors: Donghee Park, Ikuo Jitsuhara, Sung Kook Park, Osamu Miki, Hee Dong Chun, Dae Sung Lee, Jong Moon Park, Toshiaki KatoAbstract:Wastewater from electroplating plants contains several valuable metallic ions such as iron, nickel, and zinc. In general, neutralization followed by sedimentation has been used for the treatment of electroplating wastewater because of low treatment cost and high stability of treated water quality. However, this method results in the production of large amounts of heavy metal sludge that may cause secondary pollution and additional cost. In addition, the recovery of valuable metallic contents from the wastewater sludge has not been technically feasible. It would be highly desirable economically as well as environmentally if a metal recovery process from the wastewater is developed. In the present work, we developed a biological process for metal recovery from electroplating wastewater. Wastewater from electroplating plants contains iron in the form of ferrous ion together with other metal ions. To add economic value to the chemical sludge, iron should be separated from other metals such as nickel and zinc ...
Dae Sung Lee - One of the best experts on this subject based on the ideXlab platform.
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Metal recovery from electroplating wastewater using acidophilic iron oxidizing bacteria : pilot-scale Feasibility Test
Industrial & Engineering Chemistry Research, 2005Co-Authors: Donghee Park, Ikuo Jitsuhara, Sung Kook Park, Osamu Miki, Hee Dong Chun, Dae Sung Lee, Jong Moon Park, Toshiaki KatoAbstract:Wastewater from electroplating plants contains several valuable metallic ions such as iron, nickel, and zinc. In general, neutralization followed by sedimentation has been used for the treatment of electroplating wastewater because of low treatment cost and high stability of treated water quality. However, this method results in the production of large amounts of heavy metal sludge that may cause secondary pollution and additional cost. In addition, the recovery of valuable metallic contents from the wastewater sludge has not been technically feasible. It would be highly desirable economically as well as environmentally if a metal recovery process from the wastewater is developed. In the present work, we developed a biological process for metal recovery from electroplating wastewater. Wastewater from electroplating plants contains iron in the form of ferrous ion together with other metal ions. To add economic value to the chemical sludge, iron should be separated from other metals such as nickel and zinc ...
Hee Dong Chun - One of the best experts on this subject based on the ideXlab platform.
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Metal recovery from electroplating wastewater using acidophilic iron oxidizing bacteria : pilot-scale Feasibility Test
Industrial & Engineering Chemistry Research, 2005Co-Authors: Donghee Park, Ikuo Jitsuhara, Sung Kook Park, Osamu Miki, Hee Dong Chun, Dae Sung Lee, Jong Moon Park, Toshiaki KatoAbstract:Wastewater from electroplating plants contains several valuable metallic ions such as iron, nickel, and zinc. In general, neutralization followed by sedimentation has been used for the treatment of electroplating wastewater because of low treatment cost and high stability of treated water quality. However, this method results in the production of large amounts of heavy metal sludge that may cause secondary pollution and additional cost. In addition, the recovery of valuable metallic contents from the wastewater sludge has not been technically feasible. It would be highly desirable economically as well as environmentally if a metal recovery process from the wastewater is developed. In the present work, we developed a biological process for metal recovery from electroplating wastewater. Wastewater from electroplating plants contains iron in the form of ferrous ion together with other metal ions. To add economic value to the chemical sludge, iron should be separated from other metals such as nickel and zinc ...
