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Sewage sludge (SS), cement kiln dust (CKD), and plant residues (PR) were composted at different ratios under different conditions. Increasing CKD application decreased organic carbon content and C/N ratio of the final compost. NPK contents differed only slightly between the different compost types. CKD application only slightly affected total Cd, Cu, Zn and Ni concentrations in the final compost. Concentrations were lower than maximum permissible concentration for agricultural use.