Immobilization of heavy metals by microwave torrefaction of sewage sludge with additives

Conference Dates

September 15-20, 2019


The treatment of sewage sludge (SS) is one of the most important issues of the circular economy strategy in the European Union and in the Czech Republic (CR). New legislation in the CR strictly regulates the SS landfilling and its direct application in agriculture. One of the most important limiting factors for the use of SS in agriculture are the heavy metals (HMs). Thermal transformation of SS, especially pyrolysis and torrefaction, typically provides pyrolysis oil, pyrolysis gas (syngas), and solid carbonaceous product called either biochar (when used in agriculture) or charcoal. The quality of the biochar depends strongly on the quality of the input dried SS, the amount and types of additives, and the torrefaction conditions. In this work we report the results of the transformation of a mixture of SS from two municipal wastewater treatment plants (WWTPs) with several additives including catalysers (supporting the transformation of SS) and organic additives (increasing the organic carbon content).

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