Resumen:
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The stabilization of a pile of ground urban refuse was monitored during five months. Carbon dioxide evolution, temperature, moisture level, organic matter, and pH werw measured regularly. The humification index (HI) of organic matter extracted by 0.1M Na4P2O7 plus 0.1. M NaOH was found to decrease linearly with time during the thermophilic phase from about 1.4 to 0.4. Turning of the pile caused drop in the HI values, but the index increased again every time the temperature of the static pile reached 65oC. The value of the humification index in water extracts (HIw) reached a maximum after 4 d in the superficial layers and after 11 d at a depth of 30 cm. HIw values werw found to decrease hyperbolically with time during thermophilic phase.
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