Kiln-fired clay bricks synergizing nickel–chromium plating sludge and fly ash: mechanical characteristics and cradle-to-gate life cycle assessment

Life cycle assessment (LCA) of novel fired clay bricks with synergistic co-valorization of nickel-chrome plating sludge (NCPS) and fly ash (FA) is reported. 0%, 20%, and 37.5% FA was added to improve sludge-deteriorated mechanical properties. Sludge bricks (SBs) exhibited compressive strength of 11....

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Veröffentlicht in:Clean technologies and environmental policy 2023-04, Vol.25 (3), p.825-843
Hauptverfasser: Tyagi, Gaurav, Routroy, Srikanta, Singhal, Anupam, Bhunia, Dipendu, Lahoti, Mukund
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creator Tyagi, Gaurav
Routroy, Srikanta
Singhal, Anupam
Bhunia, Dipendu
Lahoti, Mukund
description Life cycle assessment (LCA) of novel fired clay bricks with synergistic co-valorization of nickel-chrome plating sludge (NCPS) and fly ash (FA) is reported. 0%, 20%, and 37.5% FA was added to improve sludge-deteriorated mechanical properties. Sludge bricks (SBs) exhibited compressive strength of 11.03 MPa, 17% water absorption, nil efflorescence, and permissible heavy metals’ leaching, complying with standards as first-class bricks. LCA was performed with the ReCiPe-2016 method, utilizing the primary experimental data, government reports, and the Ecoinvent v3.8 database. LCA analysis revealed that compared to clay bricks, SBs caused 30%, 43%, and 51% lesser harm to ecosystem quality, human health, and resource categories in the endpoint assessment. Kiln emissions, coal, clay, and transportation were chief contributors, but their cumulative endpoint impacts significantly reduced (38%, 52%, 55%, and 45%) on switching to the SBs. Terrestrial acidification, global warming, photochemical oxidant formation, and particulate matter emissions significantly affected midpoint categories. However, their impacts got reduced by 52–57% with SBs. With global annual clay brick production exceeding 1.5 trillion, agricultural soil mining causes irreversible depletion of nitrogen, phosphorous, potassium, and organic carbon in the soil. SBs utilize only 50% clay, adding substantially to environmental savings. Successful NCPS immobilization in bricks prevents leaching hazards and avoids scientific landfill construction. With a calorific value of 945 kcal/kg, NCPS acts as internal fuel during firing, reducing the external coal requirement. This work establishes the techno-environmental feasibility of recycling NCPS and producing better-performing bricks with lower environmental impacts. Graphical abstract
doi_str_mv 10.1007/s10098-022-02400-3
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Sludge bricks (SBs) exhibited compressive strength of 11.03 MPa, 17% water absorption, nil efflorescence, and permissible heavy metals’ leaching, complying with standards as first-class bricks. LCA was performed with the ReCiPe-2016 method, utilizing the primary experimental data, government reports, and the Ecoinvent v3.8 database. LCA analysis revealed that compared to clay bricks, SBs caused 30%, 43%, and 51% lesser harm to ecosystem quality, human health, and resource categories in the endpoint assessment. Kiln emissions, coal, clay, and transportation were chief contributors, but their cumulative endpoint impacts significantly reduced (38%, 52%, 55%, and 45%) on switching to the SBs. Terrestrial acidification, global warming, photochemical oxidant formation, and particulate matter emissions significantly affected midpoint categories. However, their impacts got reduced by 52–57% with SBs. With global annual clay brick production exceeding 1.5 trillion, agricultural soil mining causes irreversible depletion of nitrogen, phosphorous, potassium, and organic carbon in the soil. SBs utilize only 50% clay, adding substantially to environmental savings. Successful NCPS immobilization in bricks prevents leaching hazards and avoids scientific landfill construction. With a calorific value of 945 kcal/kg, NCPS acts as internal fuel during firing, reducing the external coal requirement. This work establishes the techno-environmental feasibility of recycling NCPS and producing better-performing bricks with lower environmental impacts. 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Sludge bricks (SBs) exhibited compressive strength of 11.03 MPa, 17% water absorption, nil efflorescence, and permissible heavy metals’ leaching, complying with standards as first-class bricks. LCA was performed with the ReCiPe-2016 method, utilizing the primary experimental data, government reports, and the Ecoinvent v3.8 database. LCA analysis revealed that compared to clay bricks, SBs caused 30%, 43%, and 51% lesser harm to ecosystem quality, human health, and resource categories in the endpoint assessment. Kiln emissions, coal, clay, and transportation were chief contributors, but their cumulative endpoint impacts significantly reduced (38%, 52%, 55%, and 45%) on switching to the SBs. Terrestrial acidification, global warming, photochemical oxidant formation, and particulate matter emissions significantly affected midpoint categories. However, their impacts got reduced by 52–57% with SBs. With global annual clay brick production exceeding 1.5 trillion, agricultural soil mining causes irreversible depletion of nitrogen, phosphorous, potassium, and organic carbon in the soil. SBs utilize only 50% clay, adding substantially to environmental savings. Successful NCPS immobilization in bricks prevents leaching hazards and avoids scientific landfill construction. With a calorific value of 945 kcal/kg, NCPS acts as internal fuel during firing, reducing the external coal requirement. This work establishes the techno-environmental feasibility of recycling NCPS and producing better-performing bricks with lower environmental impacts. 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Sludge bricks (SBs) exhibited compressive strength of 11.03 MPa, 17% water absorption, nil efflorescence, and permissible heavy metals’ leaching, complying with standards as first-class bricks. LCA was performed with the ReCiPe-2016 method, utilizing the primary experimental data, government reports, and the Ecoinvent v3.8 database. LCA analysis revealed that compared to clay bricks, SBs caused 30%, 43%, and 51% lesser harm to ecosystem quality, human health, and resource categories in the endpoint assessment. Kiln emissions, coal, clay, and transportation were chief contributors, but their cumulative endpoint impacts significantly reduced (38%, 52%, 55%, and 45%) on switching to the SBs. Terrestrial acidification, global warming, photochemical oxidant formation, and particulate matter emissions significantly affected midpoint categories. However, their impacts got reduced by 52–57% with SBs. With global annual clay brick production exceeding 1.5 trillion, agricultural soil mining causes irreversible depletion of nitrogen, phosphorous, potassium, and organic carbon in the soil. SBs utilize only 50% clay, adding substantially to environmental savings. Successful NCPS immobilization in bricks prevents leaching hazards and avoids scientific landfill construction. With a calorific value of 945 kcal/kg, NCPS acts as internal fuel during firing, reducing the external coal requirement. This work establishes the techno-environmental feasibility of recycling NCPS and producing better-performing bricks with lower environmental impacts. Graphical abstract</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><doi>10.1007/s10098-022-02400-3</doi><tpages>19</tpages></addata></record>
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subjects Acidification
Agricultural land
Bricks
Calorific value
Chromium
Chromium plating
Clay
Climate change
Coal
Coal transport
Compressive strength
Depletion
Earth and Environmental Science
Efflorescence
Emissions
Environment
Environmental Economics
Environmental Engineering/Biotechnology
Environmental impact
Environmental policy
Fly ash
Global warming
Hazard mitigation
Heavy metals
Immobilization
Industrial and Production Engineering
Industrial Chemistry/Chemical Engineering
Kiln firing
Kilns
Landfill construction
Landfills
Leaching
Life cycle analysis
Life cycle assessment
Life cycles
Mechanical properties
Metals
Nickel
Organic carbon
Organic soils
Original Paper
Oxidants
Oxidizing agents
Paperboard
Particulate emissions
Particulate matter
Photochemical oxidants
Photochemicals
Property
Recycling
Sludge
Soil fertility
Soils
Sustainable Development
Waste disposal sites
title Kiln-fired clay bricks synergizing nickel–chromium plating sludge and fly ash: mechanical characteristics and cradle-to-gate life cycle assessment
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