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Characterization of industrial wastes in relation with incineration fumes and residue composition

Abstract : This study is part of the NanoWet project funded by the French Environment & Energy Management Agency (Ademe) (CORTEA funding scheme Grant 1581C0096). Before performing incineration trials, our aim was to characterize three industrial wastes potentially harboring nano-fillers, with two out of three also containing halogenated or sulfur compounds. The wastes are respectively by-products from i) polyorganosiloxane polymerization processes (PDMS), ii) flexible PolyVinyl Chloride production (soft PVC) and, iii) soiled strong acid cation exchange resins of sulfonic type (Resin). The PDMS waste was previously studied in the framework of NanoFlueGas project. The three wastes were first characterized in terms of ultimate and proximate analysis, with a particular focus on their respective moisture, ash, heavy and alkali metals, halogens and sulfur contents, as well as on their TGA curves and Higher Heating Values. The nano-fillers contained in the wastes were evaluated regarding their morphology, size distribution and chemical composition, by using the Cryo-ultramicrotome-Transmission Electron Microscopy technique. The PDMS waste contains SiO2 nano-fillers estimated to 24.4% dwt. The soft PVC waste contains 36% dwt Cl as well as nano-fillers mainly composed of TiO2. The Resin waste exhibits a high sulfur content of 15.4% dwt, but it does not contain any nano-fillers even though the resin polymer itself is typically intrinsically nano-structured. The three wastes were incinerated separately in a custom-built lab-scale incinerator device composed of a tubular horizontal furnace adapted to control the combustion conditions (within both the combustion and post-combustion zones) to be representative to the key operating conditions of a high-temperature incineration process dedicated to industrial wastes. Temperature (T) is equal to 1,100°C in the combustion and post-combustion zones, residence time is maintained to at least two seconds in the post-combustion zone, sufficient air excess is provided so as to never drop below 11% O2 content in fluegas, by appropriately feeding primary and secondary air flows, which also contributes to achieve adequate turbulence conditions (by enabling a good mix between combustible and oxygen). A fume sampling device allows to characterize O2, CO2, CO, SO2, HCl contents as well as particulate matter concentrations in various granulometric ranges. When present, the solid residue remaining in the furnace at the end of incineration trial is analyzed to estimate the presence of nano-fillers in this solid fraction. The results showed in particular significant concentrations of HCl and SO2 in the raw fumes originating respectively from the incineration of soft PVC and Resin, in full agreement with their proximate analysis. High content of titanium was found in the soft PVC solid residue. Data from highT incineration of PDMS were interestingly compared with previous results obtained at 850°C.
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Submitted on : Thursday, May 27, 2021 - 2:38:40 PM
Last modification on : Friday, May 28, 2021 - 3:38:39 AM

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Laurence Le Coq, Aurélie Joubert, Rachid Boudhan, Christophe Dutouquet, Danielle Venditti, et al.. Characterization of industrial wastes in relation with incineration fumes and residue composition. 7. International Conference on Engineering for Waste and Biomass Valorisation (WasteEng 2018), Jul 2018, Prague, Czech Republic. ⟨ineris-03239412⟩

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