Investigates Mechanical/Biological Treatment (MBT), those processes that use mechanical and biological techniques to sort, separate and treat municipal waste. MBT has become the most talked about form of municipal waste management in Britain over the last year and is heralded as enabling local authorities to meet their targets for diverting biodegradable municipal waste from landfill. Asks whether MBT with several plants commencing in 2006 is the answer to local authorities' waste problems.Considers systems that produce Refuse-Derived Fuels (RDFs) and the alternative systems, which do not produce RDFs. RDFs are not currently eligible for Renewable Obligations Certificates (ROCs) whereas the refined renewable biomass fuels being developed are likely to be eligible and may be soon reclassified as fuels rather than waste. Concludes that MBT's success depends on the development of markets for RDFs and if they become eligible for ROCs. Table covers MBT projects in Britain.