The influencing mechanism of organic/inorganic components of sludge on chloride migration and transformation during sludge-PVC co-pyrolysis

GU Chun-han; SU Ming-xue; LI Ning; ZHU Bing

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China Environmental Science ›› 2023, Vol. 43 ›› Issue (12) : 6386-6392.

The influencing mechanism of organic/inorganic components of sludge on chloride migration and transformation during sludge-PVC co-pyrolysis

GU Chun-han, SU Ming-xue, LI Ning, ZHU Bing

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Abstract

In order to achieve the reduction of HCl emissions, the migration and spatial distribution of chlorine with organic and inorganic components in sludge during co-pyrolysis with urban organic solid waste was investigated. The representative organic/inorganic components of sludge and PVC were selected for the co-pyrolysis experiments, and the contribution of different sludge components on chlorine solidification during co-pyrolysis were determined through a neural network model. The results showed that the emission of gaseous chlorine decreased from 93.29% to 58.21%, the chlorine in tar also increased from 4.82% to 32.66%, and the chlorine remains in pyrolysis coke increased from 1.89% to 9.13% with the mixing ratio of sludge and PVC of 3:1. Cellulose, hemicellulose, polysaccharide, protein, and Fe₂O₃ in inorganic mineral components of sludge mainly promoted the transformation of gaseous chlorine to liquid phase, while lignin and CaO further promoted the transfer of gaseous chlorine to the solid phase. The established neural network model showed that the contribution of the main organic components accounts for 71.35%, and among each component, calcium oxide, in consistent with the experimental results, has the greatest contribution to the chlorine curing rate.

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chlorine enrichment / co-pyrolysis / mechanism / organic/inorganic components / urban organic solid waste

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GU Chun-han, SU Ming-xue, LI Ning, ZHU Bing. The influencing mechanism of organic/inorganic components of sludge on chloride migration and transformation during sludge-PVC co-pyrolysis[J]. China Environmental Science. 2023, 43(12): 6386-6392

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