Abstract
Agglomeration occurs during municipal sewage sludge (MSS) fluidized bed co-combustion which might affect heavy metal distribution in the bottom ash. A study on the mobility and speciation of heavy metals accompanied with agglomeration behavior and phosphorus addition should be noticed during the MSS co-combustion. The aim of this study was to evaluate the total content and speciation of heavy metals (Pb, Cd and Cr) during the MSS fluidized bed co-combustion by chemical sequential extraction and thermodynamics Equilibrium Calculation. Results indicated that the effect of phosphorus on the agglomeration/defluidization as the function of inhabitation and promotion. Distribution of heavy metals (Pb, Cd and Cr) show similar trends with the presence of a lower ratio of P/Na: the relative concentration of heavy metals in solid phase with the increased of phosphorus. In addition, the relative concentration of heavy metals in solid phase show the raise tendency with the increased of phosphorus under the circumstance of the higher ratio of P/Na due to the formation of the lower-melting-points compounds like NaPO3, the proportion of Pb and Cr residual form increased. While the percentage of Cd residual form reduced with the increasing of the amount of phosphorus. This phenomenon can be contributed by the H3PO4 would priority to react with Al2O3 and reduced the form of a stable compound CdO-Al2O3.
Graphic Abstract
Defluidization behavior is found with various P/Na ratios which resulting significantly different influences on particle agglomeration. High-melting-point compound, Na3PO4 (1613 K), is observed to inhibit Na2O-SiO2 formation at lower P/Na ratio. On the contrary, defluidization time decreases with increasing the P/Na ratio due to low-melting-point species Na-phosphates, NaPO3 (900 K) was formed in system.
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Financial support from the National Natural Science Foundation of China (No. 51608129, 51978175), Science and Technology Planning Project of Guangdong Province, China (Nos. 2017A050501036, 2018A050506046, 2019B020208017); Research Project of National United University (108-NUUPRJ-07) are gratefully acknowledged.
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Lin, K., Kuo, JH., Xiong, K. et al. Effect of Phosphorus Concentration on Alkali and Heavy Metals Transformation Under Agglomeration/Defluidization During Fluidized Bed Simulated Sludge Co-combustion. Waste Biomass Valor 11, 6903–6916 (2020). https://doi.org/10.1007/s12649-019-00913-5
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DOI: https://doi.org/10.1007/s12649-019-00913-5