An investigation into the pyrolysis and gasification of a mixture consisting of three primary components of municipal solid waste, namely plastics, textiles, and biomass, is performed in the present study. There are challenges associated with the creation of an excessive amount of wax during the process of valuing textile waste by thermal treatments. These challenges can be mitigated by the incorporation of biomass waste, which has been observed to have catalytic effects on the cracking of tar. Since this is the case, the present work investigates waste materials consisting of textiles and plastics that have been supplemented with biomass in a compositional proportion that ranges from 10 to 50%. An investigation of the thermal reformation processes, i.e., pyrolysis and gasification are carried out for three distinct RDF compositions in order to conduct a parametric evaluation. According to the findings of the study, if the gasification temperatures are raised, the amount of methane increases for the RDF that contains a larger proportion of plastics. With a maximum heating value of gas obtained as 21 MJ/kg, the gasification process is able to achieve a maximum cold gas efficiency of 96% during the current experiment.