For the MCHB WWTP in the area of SLOVNAFT refinery a technical-economic study was prepared focused on the design of a solution for co-incineration of sewage sludge and waste in one line for energy utilisation of waste. The study assessed the legislative requirements and proposed a new technological solution, which was also assessed from an economic point of view. The solution also included the design of a new sludge dewatering and drying facility.