May 1, 2024 · The EC values of the effluent were the highest in the tanks containing compost (Fig. 2 a). Food waste compost contained high amounts of soluble salts such as Na +, NH 4 +, and NO 3 − (Gondek et al., 2018; Lee et al., 2019), thus leading to the increase of EC. On the contrary, a reduction in EC was observed with the control and notably