The Experts below are selected from a list of 10956 Experts worldwide ranked by ideXlab platform

Kostis Magoulas - One of the best experts on this subject based on the ideXlab platform.

  • Chemical Stabilization of Fly Ash from Medical Waste Incinerators
    Environmental Processes, 2020
    Co-Authors: Chrisanthi Vavva, Theopisti Lymperopoulou, Kostis Magoulas, Epaminondas Voutsas
    Abstract:

    Fly ash from Medical Waste (MW) incinerators contains many toxic materials and requires appropriate treatment. In this work, a procedure for the stabilization of a fly ash produced by a MW incinerator is proposed. Firstly, a detailed characterization of the fly ash as received is presented. The European standard leaching test EN 12457/2 ( 2002 ) was used for the fly ash classification, and according to the results, the Leachate Concentration of Pb, Total Dissolved Solids (TDS), chloride and fluoride ions, exceeded the legal limit values for non-hazardous waste landfilling. A treatment method involving two processes, i.e., phosphoric acid stabilization followed by water washing, was applied for the stabilization of the MW fly ash. This method has been successfully applied for the stabilization of Municipal Solid Waste Incineration (MSWI) fly ash, and was modified in this study in order to be used for Medical Waste Incineration (MWI) fly ash treatment. Two modifications of this method were examined in order to effectively stabilize the ash and produce process wastewater with low heavy metal content. The use of 10% w /w phosphoric acid (acid to ash ratio) followed by water washing with a Liquid to Solid (L/S) ratio equal to 3:1 L kg^−1 was found to successfully stabilize the MWI fly ash and produce a waste that can be disposed of in a non-hazardous landfill. Additional use of phosphoric acid provides no significant improvement of the wastewater quality.

  • process development for chemical stabilization of fly ash from municipal solid waste incineration
    Chemical Engineering Research & Design, 2017
    Co-Authors: Chrisanthi Vavva, Epaminondas Voutsas, Kostis Magoulas
    Abstract:

    Abstract Α detailed characterization of fly ash collected from a municipal solid waste incinerator, which involves both its physicochemical properties and its leaching behavior, is presented. For the classification of the fly ash, the European standard leaching test EN 12457/2 was carried out and the leaching test results indicate that Leachate Concentration of Pb, TDS, chloride and sulfate ions, exceed the legal limit values for non-hazardous waste landfilling, according to Council Decision 2003/33/EC. Two techniques, phosphoric acid stabilization and water washing were used for the treatment of fly ash. Several parameters that affect the two processes were tested. Phosphoric acid proved to be very effective for the stabilization of Pb. Water washing reduced effectively the soluble fraction but attention was given to the mobilization of toxic heavy metals and to the wastewater which is produced. The combination of phosphoric acid stabilization and water washing was investigated, aiming to the successful stabilization of fly ash and the production of the best wastewater quality. The effect of various parameters, such as phosphoric acid to ash ratio, pH, the sequence of the two processes and different phosphate sources, was examined. The results indicate that using phosphoric acid with an acid to ash ratio of 7% w/w followed by water washing, successfully stabilizes the fly ash and produces a non-hazardous waste. In addition, the wastewater produced from this treatment method is less polluted with heavy metals than the other tested methods.

Epaminondas Voutsas - One of the best experts on this subject based on the ideXlab platform.

  • Chemical Stabilization of Fly Ash from Medical Waste Incinerators
    Environmental Processes, 2020
    Co-Authors: Chrisanthi Vavva, Theopisti Lymperopoulou, Kostis Magoulas, Epaminondas Voutsas
    Abstract:

    Fly ash from Medical Waste (MW) incinerators contains many toxic materials and requires appropriate treatment. In this work, a procedure for the stabilization of a fly ash produced by a MW incinerator is proposed. Firstly, a detailed characterization of the fly ash as received is presented. The European standard leaching test EN 12457/2 ( 2002 ) was used for the fly ash classification, and according to the results, the Leachate Concentration of Pb, Total Dissolved Solids (TDS), chloride and fluoride ions, exceeded the legal limit values for non-hazardous waste landfilling. A treatment method involving two processes, i.e., phosphoric acid stabilization followed by water washing, was applied for the stabilization of the MW fly ash. This method has been successfully applied for the stabilization of Municipal Solid Waste Incineration (MSWI) fly ash, and was modified in this study in order to be used for Medical Waste Incineration (MWI) fly ash treatment. Two modifications of this method were examined in order to effectively stabilize the ash and produce process wastewater with low heavy metal content. The use of 10% w /w phosphoric acid (acid to ash ratio) followed by water washing with a Liquid to Solid (L/S) ratio equal to 3:1 L kg^−1 was found to successfully stabilize the MWI fly ash and produce a waste that can be disposed of in a non-hazardous landfill. Additional use of phosphoric acid provides no significant improvement of the wastewater quality.

  • process development for chemical stabilization of fly ash from municipal solid waste incineration
    Chemical Engineering Research & Design, 2017
    Co-Authors: Chrisanthi Vavva, Epaminondas Voutsas, Kostis Magoulas
    Abstract:

    Abstract Α detailed characterization of fly ash collected from a municipal solid waste incinerator, which involves both its physicochemical properties and its leaching behavior, is presented. For the classification of the fly ash, the European standard leaching test EN 12457/2 was carried out and the leaching test results indicate that Leachate Concentration of Pb, TDS, chloride and sulfate ions, exceed the legal limit values for non-hazardous waste landfilling, according to Council Decision 2003/33/EC. Two techniques, phosphoric acid stabilization and water washing were used for the treatment of fly ash. Several parameters that affect the two processes were tested. Phosphoric acid proved to be very effective for the stabilization of Pb. Water washing reduced effectively the soluble fraction but attention was given to the mobilization of toxic heavy metals and to the wastewater which is produced. The combination of phosphoric acid stabilization and water washing was investigated, aiming to the successful stabilization of fly ash and the production of the best wastewater quality. The effect of various parameters, such as phosphoric acid to ash ratio, pH, the sequence of the two processes and different phosphate sources, was examined. The results indicate that using phosphoric acid with an acid to ash ratio of 7% w/w followed by water washing, successfully stabilizes the fly ash and produces a non-hazardous waste. In addition, the wastewater produced from this treatment method is less polluted with heavy metals than the other tested methods.

Chrisanthi Vavva - One of the best experts on this subject based on the ideXlab platform.

  • Chemical Stabilization of Fly Ash from Medical Waste Incinerators
    Environmental Processes, 2020
    Co-Authors: Chrisanthi Vavva, Theopisti Lymperopoulou, Kostis Magoulas, Epaminondas Voutsas
    Abstract:

    Fly ash from Medical Waste (MW) incinerators contains many toxic materials and requires appropriate treatment. In this work, a procedure for the stabilization of a fly ash produced by a MW incinerator is proposed. Firstly, a detailed characterization of the fly ash as received is presented. The European standard leaching test EN 12457/2 ( 2002 ) was used for the fly ash classification, and according to the results, the Leachate Concentration of Pb, Total Dissolved Solids (TDS), chloride and fluoride ions, exceeded the legal limit values for non-hazardous waste landfilling. A treatment method involving two processes, i.e., phosphoric acid stabilization followed by water washing, was applied for the stabilization of the MW fly ash. This method has been successfully applied for the stabilization of Municipal Solid Waste Incineration (MSWI) fly ash, and was modified in this study in order to be used for Medical Waste Incineration (MWI) fly ash treatment. Two modifications of this method were examined in order to effectively stabilize the ash and produce process wastewater with low heavy metal content. The use of 10% w /w phosphoric acid (acid to ash ratio) followed by water washing with a Liquid to Solid (L/S) ratio equal to 3:1 L kg^−1 was found to successfully stabilize the MWI fly ash and produce a waste that can be disposed of in a non-hazardous landfill. Additional use of phosphoric acid provides no significant improvement of the wastewater quality.

  • process development for chemical stabilization of fly ash from municipal solid waste incineration
    Chemical Engineering Research & Design, 2017
    Co-Authors: Chrisanthi Vavva, Epaminondas Voutsas, Kostis Magoulas
    Abstract:

    Abstract Α detailed characterization of fly ash collected from a municipal solid waste incinerator, which involves both its physicochemical properties and its leaching behavior, is presented. For the classification of the fly ash, the European standard leaching test EN 12457/2 was carried out and the leaching test results indicate that Leachate Concentration of Pb, TDS, chloride and sulfate ions, exceed the legal limit values for non-hazardous waste landfilling, according to Council Decision 2003/33/EC. Two techniques, phosphoric acid stabilization and water washing were used for the treatment of fly ash. Several parameters that affect the two processes were tested. Phosphoric acid proved to be very effective for the stabilization of Pb. Water washing reduced effectively the soluble fraction but attention was given to the mobilization of toxic heavy metals and to the wastewater which is produced. The combination of phosphoric acid stabilization and water washing was investigated, aiming to the successful stabilization of fly ash and the production of the best wastewater quality. The effect of various parameters, such as phosphoric acid to ash ratio, pH, the sequence of the two processes and different phosphate sources, was examined. The results indicate that using phosphoric acid with an acid to ash ratio of 7% w/w followed by water washing, successfully stabilizes the fly ash and produces a non-hazardous waste. In addition, the wastewater produced from this treatment method is less polluted with heavy metals than the other tested methods.

Yi Chun Dai - One of the best experts on this subject based on the ideXlab platform.

  • Study on Asphalt Solidification of Hospital Waste Incineraten Fly Ash
    Advanced Materials Research, 2012
    Co-Authors: Liang Wei, Yi Chun Dai
    Abstract:

    Asphalt solidification of hospital waste Incineraten fly ash was studied based on that asphalt can immobilize the heavy metals in fly ash. In the nature hospital waste incineraten fly ash, the Leachate Concentration of Zn (279.2 mg/L) and Pb (19.88 mg/L)) were significantly higher than the regulatory limit by TCLP test while the Leachate Concentration of Cu (1.51 mg/L), Cd(0.97 mg/L) and Ni (0.49 mg/L) were respectively beyond the regulatory limit of TCLP. In the asphalt solidified hospital waste incineraten fly ash, the Leachate Concentration of the heavy metals increased with the increase of fly ash rate in solidified fly ash from 10% to 40%, and the Leachate Concentration of 5 studied heavy metals were under the limit of the standard.

  • Experimental Study on Treatment of Hospital Waste Incineraten Fly Ash by Solidification Process with Cement
    Advanced Materials Research, 2012
    Co-Authors: Liang Wei, Yi Chun Dai
    Abstract:

    It was found that cement can immobilize the heavy metals of hospital waste incineration fly ash. Based on this, a method of hospital waste fly ash management with cement solidification was proposed. In the nature hospital waste incineration fly ash, the Leachate Concentration of Zn (279.2 mg/L) and Pb (19.88 mg/L)) exceed the regulatory limit for the TCLP test. In the cement solidified fly ash, the Leachate Concentration of Zn was in excess of the standard limit while the Leachate Concentration of Cd, Ni, Cu and Pb were under the limit of the standard, and the Leachate Concentration of the heavy metals decreased with the increase of curing time (experimental curing time from 3 days to 28 days）and cement rate (cement rate was respectively 40%, 50% and 60% in the experiment).

  • Study on Treatment of Hospital Waste Incineraten Fly Ash by Solidification Process with Asphalt and Chemical Additive in Combination
    Advanced Materials Research, 2012
    Co-Authors: Liang Wei, Yi Chun Dai
    Abstract:

    Experiments proved that asphalt and chemical additives can immobilize the heavy metals of hospital waste incineraten fly ash, and asphalt and chemical additive in combination can arrive better solidification effect than asphalt singly. In the nature hospital waste incineraten fly ash, the Leachate Concentration of Zn and Pb were significantly higher than the regulatory limit by TCLP test while the Leachate Concentration of Zn, Cd and Pb were respectively in excess of the regulatory limit of GB5086-1997 in China. In the solidified hospital waste incineraten fly ash with asphalt and chemical additive (four experimental chemical additives of Na2S, NaOH, Na3PO4 and the mixture of Na2S and NaOH ) in combination, the Leachate rate of the heavy metals decreased with the increase of chemical additives rate in solidified fly ash. Chemical additives rate of 3% were selected for the solidification effect and economics of the application, and the Leachate Concentration of 5 tested heavy metals were under the limit of the standard by TCLP and GB5086-1997 of China.

Liang Wei - One of the best experts on this subject based on the ideXlab platform.

  • Study on Asphalt Solidification of Hospital Waste Incineraten Fly Ash
    Advanced Materials Research, 2012
    Co-Authors: Liang Wei, Yi Chun Dai
    Abstract:

    Asphalt solidification of hospital waste Incineraten fly ash was studied based on that asphalt can immobilize the heavy metals in fly ash. In the nature hospital waste incineraten fly ash, the Leachate Concentration of Zn (279.2 mg/L) and Pb (19.88 mg/L)) were significantly higher than the regulatory limit by TCLP test while the Leachate Concentration of Cu (1.51 mg/L), Cd(0.97 mg/L) and Ni (0.49 mg/L) were respectively beyond the regulatory limit of TCLP. In the asphalt solidified hospital waste incineraten fly ash, the Leachate Concentration of the heavy metals increased with the increase of fly ash rate in solidified fly ash from 10% to 40%, and the Leachate Concentration of 5 studied heavy metals were under the limit of the standard.

  • Experimental Study on Treatment of Hospital Waste Incineraten Fly Ash by Solidification Process with Cement
    Advanced Materials Research, 2012
    Co-Authors: Liang Wei, Yi Chun Dai
    Abstract:

    It was found that cement can immobilize the heavy metals of hospital waste incineration fly ash. Based on this, a method of hospital waste fly ash management with cement solidification was proposed. In the nature hospital waste incineration fly ash, the Leachate Concentration of Zn (279.2 mg/L) and Pb (19.88 mg/L)) exceed the regulatory limit for the TCLP test. In the cement solidified fly ash, the Leachate Concentration of Zn was in excess of the standard limit while the Leachate Concentration of Cd, Ni, Cu and Pb were under the limit of the standard, and the Leachate Concentration of the heavy metals decreased with the increase of curing time (experimental curing time from 3 days to 28 days）and cement rate (cement rate was respectively 40%, 50% and 60% in the experiment).

  • Study on Treatment of Hospital Waste Incineraten Fly Ash by Solidification Process with Asphalt and Chemical Additive in Combination
    Advanced Materials Research, 2012
    Co-Authors: Liang Wei, Yi Chun Dai
    Abstract:

    Experiments proved that asphalt and chemical additives can immobilize the heavy metals of hospital waste incineraten fly ash, and asphalt and chemical additive in combination can arrive better solidification effect than asphalt singly. In the nature hospital waste incineraten fly ash, the Leachate Concentration of Zn and Pb were significantly higher than the regulatory limit by TCLP test while the Leachate Concentration of Zn, Cd and Pb were respectively in excess of the regulatory limit of GB5086-1997 in China. In the solidified hospital waste incineraten fly ash with asphalt and chemical additive (four experimental chemical additives of Na2S, NaOH, Na3PO4 and the mixture of Na2S and NaOH ) in combination, the Leachate rate of the heavy metals decreased with the increase of chemical additives rate in solidified fly ash. Chemical additives rate of 3% were selected for the solidification effect and economics of the application, and the Leachate Concentration of 5 tested heavy metals were under the limit of the standard by TCLP and GB5086-1997 of China.