Elimination of poly- and perfluoro alkyl substances (PFAS) in a wastewater biosolids gasification process using a thermal oxidizer and hydrated lime injection

An apparatus comprising:

• a source of feedstock comprising poly and perfluoroalkyl substances (PFAS);
• a gasifier having an operating temperature, operably coupled with the source of feedstock to receive the feedstock, configured to gasify and devolatilize poly and perfluoroalkyl substances (PFAS) in the feedstock, liberate PFAS from solids in the feedstock, decompose the PFAS liberated from the solids feedstock, and emit syngas produced based on gasifying the feedstock;
• a thermal oxidizer having an operating temperature, operably coupled with the gasifier to receive the syngas, wherein the thermal oxidizer is configured to combust the syngas and emit heated flue gas produced based on combusting the syngas;
• a heat exchanger, operably coupled with the thermal oxidizer to receive the flue gas, wherein the heat exchanger is configured to cool the heated flue gas and emit the cooled flue gas in a gas stream exiting the heat exchanger;
• a filter unit operably coupled to the heat exchanger to filter the cooled flue gas stream exiting the heat exchanger;
• and
• a source of hydrated lime operably coupled to the heat exchanger, wherein said hydrated lime is injected into the filter unit at an exit of the heat exchanger and spent lime is removed in the filter unit.