represents the cumulative biogas content of all digestersas function of time. CD had a better biogas yield reaching a totalproduction of 52 NmL of biogas in 24 d which corresponds on 104NmL biogas g1 VS added. The fact that the inoculum (anaerobicsludge) was not used is responsible for the long lag phase of biogasproduction. The lower biogas production of the mixture CD:SMcould be due to antagonistic phenomena between the microorganismsof CD and SM