The anaerobic process existing into the biodegradation of the domestic waste can be accelerated by an addition of biological sludge, having the role of a process activator. An addition of 20 – 25% biological sludge determines the decrease of the biodegradation period with 32%. At the end of the process the ration C/N has values of 17,8 – 18,2%, values which can direct the utilization of the waste for punching.