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Effect of Magnesium Additives on Phosphorous Recovery during Sewage Sludge Combustion and Further Improvement of Bioavailable Phosphorous

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  • Yi Xiao

    (National Engineering Laboratory for Reducing Emissions from Coal Combustion, School of Energy and Power Engineering, Shandong University, Jinan 250061, China
    Engineering Research Center of Environmental Thermal Technology of Ministry of Education, School of Energy and Power Engineering, Shandong University, Jinan 250061, China
    Shandong Key Laboratory of Energy Carbon Reduction and Resource Utilization, School of Energy and Power Engineering, Shandong University, Jinan 250061, China)

  • Xiaohan Ren

    (Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China)

  • Juan Chen

    (National Engineering Laboratory for Reducing Emissions from Coal Combustion, School of Energy and Power Engineering, Shandong University, Jinan 250061, China
    Engineering Research Center of Environmental Thermal Technology of Ministry of Education, School of Energy and Power Engineering, Shandong University, Jinan 250061, China
    Shandong Key Laboratory of Energy Carbon Reduction and Resource Utilization, School of Energy and Power Engineering, Shandong University, Jinan 250061, China)

Abstract

Sewage sludge (SS), a solid waste taking up a large amount of public resources, contains abundant phosphorous and urgently needs appropriate recovery, but incineration, the existing popular SS treatment method, fails to reuse phosphorous as a feasible product due to the poor phosphorous bioavailability of SS ash. Based on the mono-combustion of SS, magnesian minerals comprising of magnesium oxide were doped with SS to carry out the behavior of magnesium in phosphorous capture and its sensitivity to subsequent thermochemical modification. Five percent MgO improved phosphorous capture, and its effectiveness was disturbed by sulfur at 900 °C. The more H 2 O that was pumped into the atmosphere, the more phosphorous was captured by 5% MgO. The capacity of MgO in phosphorous capture was inferior to that of CaO. The utilization efficiency of MgO for phosphorous capture was inferior to that of CaO. A total of 7.2% MgO succeeded in recovering 97.46% phosphorous with 5% H 2 O at 900 °C. A total of 15.06% hydromagnesite merely promoted 1.85% and 5.13% of the phosphorous relative enrichment factor ( RE ) in SS ashes without or with 5% H 2 O, respectively, whereas it recovered 90.21% phosphorous with 10% H 2 O, supposing a potentiality in phosphorous capture for the direct combustion of wet SS. However, having been improved by magnesium, the bioavailability of phosphorous in SS ash remained extremely limited. Thus, thermal modification by K 2 CO 3 was applied, where the limited bioavailability of phosphorous in the SS ashes was remarkably alleviated; although, SiO 2 and sulfate were the main disturbers and led to the production of K 2 MgSiO 4 and K 2 Mg 2 (SO 4 ) 3 . The effective constituents were KMgPO 4 and K 3 CaH(PO 4 ) 2 in the final mixed fertilizer. The obtained mixed fertilizer might be suitable for application on acidic soils.

Suggested Citation

  • Yi Xiao & Xiaohan Ren & Juan Chen, 2022. "Effect of Magnesium Additives on Phosphorous Recovery during Sewage Sludge Combustion and Further Improvement of Bioavailable Phosphorous," Energies, MDPI, vol. 15(3), pages 1-13, January.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:3:p:909-:d:735253
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    References listed on IDEAS

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    1. Tyagi, Vinay Kumar & Lo, Shang-Lien, 2013. "Sludge: A waste or renewable source for energy and resources recovery?," Renewable and Sustainable Energy Reviews, Elsevier, vol. 25(C), pages 708-728.
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    1. Milan Carsky & Olga Solcova & Karel Soukup & Tomas Kralik & Kamila Vavrova & Lukas Janota & Miroslav Vitek & Stanislav Honus & Marek Jadlovec & Lenka Wimmerova, 2022. "Techno-Economic Analysis of Fluidized Bed Combustion of a Mixed Fuel from Sewage and Paper Mill Sludge," Energies, MDPI, vol. 15(23), pages 1-13, November.

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