Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Co-disposal of MSWI fly ash and spent caustic through alkaline-activation: Immobilization of heavy metals and organics
Abstract This work investigated the immobilization of municipal solid waste incineration (MSWI) fly ash using spent caustic as alkaline activator and blast furnace slag (BFS) as an additive, in which comparable alkalinity NaOH solution was used as controlling alkaline activator. The leaching behavior of heavy metals and organics in alkali-activated MSWI fly ash-based mortars were characterized by HJ/T 300–2007 method, BCR chemical speciation analysis, and total organics carbon (TOC) and organics measurements. It was found that the spent caustic-activated mortars exhibited a weaker immobilization performance for Cu, Pb, Zn and Cd, and a better performance for Cr (VI), comparing to NaOH-activated mortars. The presence of organics and the formation of ettringite in spent caustic-activated mortars made the immobilization of Cr(VI) more feasible. As increasing the BFS dosage, the immobilization efficiency of heavy metals was improved. For the immobilization of organics, the spent caustic-activated mortars were of a medium performance. This study extends a novel waste-derived alkaline activator in the alkaline activation filed and would favor the development of waste management.
Co-disposal of MSWI fly ash and spent caustic through alkaline-activation: Immobilization of heavy metals and organics
Abstract This work investigated the immobilization of municipal solid waste incineration (MSWI) fly ash using spent caustic as alkaline activator and blast furnace slag (BFS) as an additive, in which comparable alkalinity NaOH solution was used as controlling alkaline activator. The leaching behavior of heavy metals and organics in alkali-activated MSWI fly ash-based mortars were characterized by HJ/T 300–2007 method, BCR chemical speciation analysis, and total organics carbon (TOC) and organics measurements. It was found that the spent caustic-activated mortars exhibited a weaker immobilization performance for Cu, Pb, Zn and Cd, and a better performance for Cr (VI), comparing to NaOH-activated mortars. The presence of organics and the formation of ettringite in spent caustic-activated mortars made the immobilization of Cr(VI) more feasible. As increasing the BFS dosage, the immobilization efficiency of heavy metals was improved. For the immobilization of organics, the spent caustic-activated mortars were of a medium performance. This study extends a novel waste-derived alkaline activator in the alkaline activation filed and would favor the development of waste management.
Co-disposal of MSWI fly ash and spent caustic through alkaline-activation: Immobilization of heavy metals and organics
Tian, Xiang (Autor:in) / Rao, Feng (Autor:in) / León-Patiño, Carlos Alberto (Autor:in) / Song, Shaoxian (Autor:in)
18.09.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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