Reducing volatilization of heavy metals in phosphate-pretreated municipal solid waste incineration fly ash by forming pyromorphite-like minerals

• Published in: Waste management (Elmsford) Vol. 31; no. 2; pp. 325 - 330
• Main Authors: Sun, Ying, Zheng, Jianchang, Zou, Luquan, Liu, Qiang, Zhu, Ping, Qian, Guangren
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Kidlington Elsevier Ltd 01.02.2011; Elsevier
• Subjects: AEROSOL WASTES; Applied sciences; ASHES; CADMIUM; Carbon - chemistry; CHEMICAL REACTIONS; Coal Ash; COMBUSTION; COMBUSTION PRODUCTS; DISSOLUTION; ELEMENTS; ENVIRONMENTAL SCIENCES; EVAPORATION; Exact sciences and technology; EXTRACTION; FLY ASH; Forming; HEAVY METALS; Hot Temperature; Incineration; LEACHING; LEAD; MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; METALS; Metals, Heavy - analysis; Metals, Heavy - chemistry; MINERALS; Minerals - chemical synthesis; municipal solid waste; Other wastes and particular components of wastes; OXIDATION; OXYGEN COMPOUNDS; Particulate Matter - chemistry; PHASE TRANSFORMATIONS; PHOSPHATES; Phosphates - chemical synthesis; Phosphates - chemistry; PHOSPHORUS COMPOUNDS; Pollution; pretreatment; Refuse Disposal; RESIDUES; SEPARATION PROCESSES; SOLID WASTES; STABILIZATION; temperature; THERMOCHEMICAL PROCESSES; Time Factors; TOXICITY; Urban and domestic wastes; Volatilization; waste incineration; waste utilization; WASTES; X-Ray Diffraction; ZINC; Phosphates; Fly ash; Incineration; Stabilization; Toxicity; Volatilization; Urban waste; Solid waste; Sequential extraction; Lixiviation; Heavy metal
• ISSN: 0956-053X; 1879-2456
• DOI: 10.1016/j.wasman.2010.10.011

This research investigated the feasibility of reducing volatilization of heavy metals (lead, zinc and cadmium) in municipal solid waste incineration (MSWI) fly ash by forming pyromorphite-like minerals via phosphate pre-treatment. To evaluate the evaporation characteristics of three heavy metals from phosphate-pretreated MSWI fly ash, volatilization tests have been performed by means of a dedicated apparatus in the 100–1000 °C range. The toxicity characteristic leaching procedure (TCLP) test and BCR sequential extraction procedure were applied to assess phosphate stabilization process. The results showed that the volatilization behavior in phosphate-pretreated MSWI fly ash could be reduced effectively. Pyromorphite-like minerals formed in phosphate-pretreated MSWI fly ash were mainly responsible for the volatilization reduction of heavy metals in MSWI fly ash at higher temperature, due to their chemical fixation and thermal stabilization for heavy metals. The stabilization effects were encouraging for the potential reuse of MSWI fly ash.