I have three bioreactors, the first one with municipal solid waste mixed with sludge from anaerobic digeastion of waste water treatment plant, the second with msw mixed with prunings and sludge and the third one msw mixed with olive pits and sludge. The anaerobic phase lasts 190 days and the aerobic phase 60 days. The main problem is that during the aerobic phase the redox potential is reduced more and faster.