Related Experiment Video
Updated: Jun 22, 2026

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
Published on: February 21, 2017
Wet extraction of heavy metals and chloride from MSWI and straw combustion fly ashes
M Aguiar del Toro1, W Calmano, H Ecke
1Hamburg University of Technology, Institute of Environmental Technology and Energy Economics, Eissendorfer Street 40, D-21073 Hamburg, Germany.
Abstract:
Fly ash residues from combustion often do not meet the criteria neither for reuse as construction materials nor landfilling as non-hazardous waste, mainly because of the high concentration of heavy metals and chlorides. This work aimed to technically evaluate an innovative wet treatment process for the extraction of chloride (Cl(-)), cadmium (Cd), copper (Cu), lead (Pb) and zinc (Zn) from fly ashes from a municipal solid waste incineration (MSWI) plant and from a straw combustion (SC) facility. Factors investigated were liquid/solid (L/S) ratio, full carbonation (CO(2) treatment), influence of pH and leaching time, using a two-level full factorial design. The most significant factor for all responses was low pH, followed by L/S ratio. Multiple linear regression models describing the variation in extraction data had R(2) values ranging from 58% to 98%. An optimization of the element extraction models was performed and a set of treatment conditions is suggested.
Related Concept Videos
Sample Preparation for Analysis: Advanced Techniques
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
Washing, Drying, and Ignition of Precipitates
Microbial Leaching
Atomic Absorption Spectroscopy: Atomization Methods
Extraction: Advanced Methods

