In the context of low-
carbon development, as a waste rich in
lipids, kitchen waste (KW) has received increasing attention for resource utilization and low-
carbon utilization. In this study, we explored a method for efficient extraction of
lipids and
dehydration using liquefied
dimethyl ether (L-DME) to address the problem of high
lipids and the difficulty of dewatering of KW. A closed DME reaction vessel was used to conduct experiments on the effects of
lipids extraction and
dehydration of KW under different reaction times, mass ratios, temperatures and moisture contents. It was found that DME could extract more than 90% of the
lipids and the
dehydration rate could reach approximately 80%. The main components of the
lipids in the liquid phase extract were
fatty acids (C18:2, C18:1, C16:0, and C18:0) whose good thermal properties made them suitable for use as a feedstock for
biodiesel production. Moreover, the greatly increased heating value of the solid residue facilitated low-
carbon utilization. This study also demonstrated a promotion effect of the co-dissolution system of L-DME and water on the extraction of
lipids and explored the related mechanism.