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    METODO Y APARATO PARA CONTROLAR LA ALIMENTACION DE PRODUCTOS QUIMICOS PARA TRATAMIENTO DE AGUA, UTILIZANDO UN DETECTOR VOLTAMETRICO.
    122.
    发明专利
    METODO Y APARATO PARA CONTROLAR LA ALIMENTACION DE PRODUCTOS QUIMICOS PARA TRATAMIENTO DE AGUA, UTILIZANDO UN DETECTOR VOLTAMETRICO. 未知

    公开(公告)号：MX9602760A

    公开(公告)日：1998-11-30

    申请号：MX9602760

    申请日：1996-07-12

    Applicant: BUCKMAN LABOR INC

    Inventor： MCNEEL THOMAS E

    IPC: B01D21/30 ,  C02F1/00 ,  C02F1/52 ,  G01N27/26 ,  G01N27/416 ,  G01N27/49 ,  G01N33/18

    Abstract: La presente invencion se refiere a método para controlar el tratamiento químico de una solucion, que comprende las etapas de: (a) alimentar un producto químico de tratamiento en la solucion para obtener una mezcla del químico de tratamiento y la solucion; (b) aplicar un voltaje externo a través de un electrodo de referencia y un electrodo de trabajo de un sensor o detector voltamétrico, mientras que los electrodos se sumergen en y contactan la mezcla (c) medir una corriente que circula a través del electrodo de trabajo; (d) convertir la corriente medida en una señal de retroalimentacion que es indicativa de una concentracion de una substancia en la mezcla; y (e) utilizar la señal de retroalimentacion para controlar una tasa de alimentacion del producto químico de tratamiento en la etapa (a).

    124.
    发明专利
    未知

    公开(公告)号：FI962837A

    公开(公告)日：1996-09-12

    申请号：FI962837

    申请日：1996-07-12

    Applicant: BUCKMAN LABOR INC

    Inventor： MCNEEL THOMAS E

    IPC: B01D21/30 ,  C02F1/00 ,  C02F1/52 ,  G01N27/26 ,  G01N27/416 ,  G01N27/49 ,  G01N33/18 ,  G01N

    Abstract: A method for controlling the chemical treatment of a solution comprises the steps of feeding a treatment chemical into the solution, applying an external voltage across a reference electrode and a working electrode of a voltammetric sensor while the electrodes are immersed in the solution, measuring a current that flows through the working electrode, converting the measured current into a feedback signal indicative of the concentration of treatment chemical in the solution, and using the feedback signal to control the rate of feeding the treatment chemical.

    Process for the treatment of metal-containing water and recovery of metals therefrom
    127.
    发明专利
    Process for the treatment of metal-containing water and recovery of metals therefrom 未知

    公开(公告)号：AU1679595A

    公开(公告)日：1995-08-01

    申请号：AU1679595

    申请日：1995-01-12

    Applicant: BOARD OF REGENTS OF THE UNIVERSITY AND COMMUNITY COLLEGE SYSTEM OF NEVADA THE ,  BUCKMAN LABOR INC

    Inventor： MISRA MANORANJAN ,  KRAVETZ MARK E ,  YANG KANG ,  MCNEEL THOMAS E

    IPC: C02F1/58 ,  C01G49/00 ,  C02F1/62 ,  C02F1/64 ,  C02F1/66 ,  C02F1/70 ,  C02F1/72 ,  C02F9/00

    Abstract: Metals contained in various wastewaters are selectively recovered as metal precipitates and/or as spinel ferrite and water suitable for discharge into the environment is obtained. High grade magnetic spinel ferrite is recovered from wastewaters having aluminum and arsenic if present in the wastewater, removed from the wastewater. There are three process stages for the treatment of wastewater. In the first process stage which is optional, at least a portion of at least one non-ferrous or non-ferric metal is precipitated from the wastewater by subjecting the wastewater to an oxidizing agent to increase the oxidation-reduction potential of the water, by adjusting the pH of the wastewater to a pH at which the metal precipitates from the water and by adding an organic or inorganic sulfur compound, capable of causing the metal to form a precipitate, to the water in a quantity sufficient to precipitate the metal. When aluminum is present in the wastewater, aluminum is recovered from the water by adding a reducing agent to lower the oxidation-reduction potential of the water and by adjusting the pH of the water to about 5. The aluminum which precipitates in the aqueous solution, is removed from the water. In the third precipitation stage, iron is recovered as spinel ferrite in an ambient temperature process by adding a reducing agent to the water, adding a soluble ferrous salt to the water, adjusting the pH to about 9-12 and oxidizing the water with an oxidizer, e.g., air, to form spinel ferrite. If aluminum and/or arsenic are present in the wastewater and are removed from the wastewater by the process, high grade magnetic spinel ferrite is recovered.

    PROCESS FOR THE TREATMENT OF METAL-CONTAINING WATER AND RECOVERY OF METALS THEREFROM
    128.
    发明专利
    PROCESS FOR THE TREATMENT OF METAL-CONTAINING WATER AND RECOVERY OF METALS THEREFROM 未知

    公开(公告)号：CA2181166A1

    公开(公告)日：1995-07-20

    申请号：CA2181166

    申请日：1995-01-12

    Applicant: BUCKMAN LABOR INC ,  UNIV COMMUNITY COLLEGE SYS NEV

    Inventor： MISRA MANORANJAN ,  KRAVETZ MARK E ,  YANG KANG ,  MCNEEL THOMAS E

    IPC: C02F1/58 ,  C01G49/00 ,  C02F1/62 ,  C02F1/64 ,  C02F1/66 ,  C02F1/70 ,  C02F1/72 ,  C02F9/00

    Abstract: Metals contained in various wastewaters are selectively recovered as metal p recipitates and/or as spinel ferrite and water suitable for discharge into the environment is obtained. High grade magnetic spinel f errite is recovered from wastewaters having aluminum and arsenic, if present in the wastewater, removed from the wastewater. There ar e three process stages for the treatment of wastewater. In the first process stage, which is optional, at least a portion of at least one n on-ferrous or non-ferric metal is precipitated from the wastewater by subjecting the wastewater to an oxidizing agent to increase the oxidation -reduction potential of the water, by adjusting the pH o f the wastewater to a pH at which the metal precipitates from the water and by add ing an organic or inorganic sulfur compound, capable of causing the metal to form a precipitate, to the water in a quantity sufficie nt to precipitate the metal. When aluminum is present in the wastewater, aluminum is recovered from the water by adding a reducing agent to lower the oxidation-reducing potential of the water a nd by adjusting the pH of the water to about 5. The aluminum which precipitates in the aqueous solution is removed from the water. In the third precipitation stage iron is recovered as spinel ferrite in an ambi ent temperature process by adding a reducing agent to th e water, adding a soluble ferrous salt to the water, adjusting the pH to about 9-12 a nd oxidizing the water with an oxidizer, e.g. air, to fo rm spinel ferrite. If aluminum and/or arsenic are present in the wastewater and are re moved from the wastewater by the process, high grade mag netic spinel ferrite is recovered.

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