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The biodegradation of mixtures of diapers crumbled with residuals of pruning of gardens in a cylindrical batch reactor with agitation was studied. The weight of diapers was varied among 15 to 47%, grass 31% and sawdust the rest. The reaction temperature increased from 20 to 64 • C as a result of biologic activity and it diminished up to 25 • C in 3 weeks. The source genesis of the batch leaching liquid began with a pH of 7 and to the third day it went down to 5.6 due to the hydrolisis of organic compounds. The nitrogen contents increased from 1% up to 2.1% after 28 days due to the loss of CO2. Sawdust concentrations no more than 20% were suitable for the biodegradation reaction. The variation of the content of organic matter in function of the time was described using a kinetics of first order and the reaction model solid-gas of waning nucleus until 30 days in which the chemical reaction controled. After this time a diffusion process seemed to be more important.