Efficient and sustainable recovery of lipids from sewage sludge using ethyl esters of volatile fatty acids as sustainable extracting solvent

This work focuses on the recovery of resources from urban sewage sludge. Sewage sludge is generated by water treatment plants and contains a significant amount lipids that can be used in number applications fine chemistry. study reports extraction using ethyl esters volatile fatty acids as solvents. A thermodynamic was first performed synthetic primary order to identify best operating conditions apply real samples Ethyl butyrate showed separation performance. It capable efficiently recovering lipid component sludge, which typically resulted 13–23% total solids. Highly pure calcium soaps extracted high amounts (yield up 93%), while exhausted residual aqueous phase not significantly contaminated solvent could anaerobically digested easily. Finally, directly biolubricant or converted into biodiesel aluminum chloride hexahydrate catalyst 85%).