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The optimization of process parameters for decomposition of kitchen waste into stable compost was investigated using response surface methodology (RSM). Key factors evaluated were kitchen waste, bulking agent, ash and palm oil sludge. Moisture content and C/N ratio which affect stability of compost were also investigated. NPK were selected as the response variables. The experimental data obtained were fitted into the model using analysis of variance ( ANOVA) which was found to be significant with a probability value of P< 0.5. The study showed that interaction between kitchen wastes (55%), bulking agent (30%), ash and palm oil sludge (15%), for a duration of two to ten weeks had significant effect on NPK optimization. The optimized conditions recorded moisture content of 81.18% and 74.25% and C/N ratio of 16.88% and 3.35% for co-compost and compost respectively. The statistical model showed a significant agreement between the adjusted and predicted R2 value. Locally sourced inorganic fertilizer was characterized (N:P:K, 855.19±0.02: 27206.67±2.08: 1620.79±0.23 g/kg) and compared with the co-compost (N:P:K, 188.16±71.77: 772.94±65.05: 689.13±203.96 g/kg) and compost (N:P:K, 745.84±60.02: 396.27±69.08: 1416.49±304.44 g/kg). It was concluded that optimization of the compost parameters NPK is dependent on duration.
