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Evaluation of Chloride Reduction in the Residue of Carbonization from the Mixture of Wood Waste and Sewage Sludge
According to the quality standards of the BIO-SRF(Bio-Solid Fuel Products) in Act on the Promotion of Saving and Recycling of Resources enforcement regulations, chloride is regulated to less than 0.5wt.%. The reason why chloride was regulated may generate HCl and dioxin when bio-solid fuel was burnt. Chloride and chloride compounds can be presented the characteristic of corrosiveness. These materials is reacted with iron to produce ferric chloride. Ferric chloride is oxidized to ferric oxide and ferric oxide can cause a pipe corrosion to short boiler life in combustion facility. There are several reactions to reduce Cl concentration in organic wastes and some wastes can be used in nucleophile reaction as reductive agents. Nucleophile(Nu) material can be represented by phosphate, nitrate, sulfate etc. Nu materials can substitute them for chlorine-based compounds(X-: Cl-, Br-, I-). Nu materials can reduce the harmfulness and chlorine concentration by substituting them for chlorine-based compounds of the solid fuel product produced by carbonization. In order to produce solid fuel product from organic wastes, carbonization among pyrolysis processes is suitable because nucleophile reaction should be an endothermic reaction, which heat must be entered to solid fuel product from outside. In this study, sewage sludge is used as a reductive agent to evaluate the characteristics of the reduction reaction in carbonization process because a large amount of Nu material is contained in sewage sludge. In order to evaluate the effect of Nu materials to control chloride in the residue of carbonization, waste wood mixed with sewage sludge was used in carbonization process.
