The facility exploited for enabling Waste Organic Fraction (WOF) continuous flow in the aerobic biological section of an existing Mechanical Biological Treatment plant has an important influence on the physical parameters of the process. Temperature and Volatile Solids remains quite constant among the inlet and outlet sections around 70°C and 50% respectively. The stabilization level of the WOF evaluated by the Dynamic Respirometer Index Potential (DRIP) of several samples withdrawn along the basin width is significantly increased in the first half portion of the aerobic basin remaining quite constant in the second half. This is mainly a consequence of the strong Humidity reduction that becomes rapidly lower than 40% leading to bacterial activity inhibition. The simulation model developed in this work shows that the mean Retention Time of the WOF inside the aerobic basin is of about 14-16 days, being strongly influenced by the WOF daily inlet rate. Further, the model put in evidence that the aerobic section seems able to allow the WOF to achieve a DRIP lower than 1000 mgO2/kgVSh, if an adequate amount of water is added during the process.
Analysis of the evolution of waste stability during active composting time
DI MARIA, Francesco;
In corso di stampa
Abstract
The facility exploited for enabling Waste Organic Fraction (WOF) continuous flow in the aerobic biological section of an existing Mechanical Biological Treatment plant has an important influence on the physical parameters of the process. Temperature and Volatile Solids remains quite constant among the inlet and outlet sections around 70°C and 50% respectively. The stabilization level of the WOF evaluated by the Dynamic Respirometer Index Potential (DRIP) of several samples withdrawn along the basin width is significantly increased in the first half portion of the aerobic basin remaining quite constant in the second half. This is mainly a consequence of the strong Humidity reduction that becomes rapidly lower than 40% leading to bacterial activity inhibition. The simulation model developed in this work shows that the mean Retention Time of the WOF inside the aerobic basin is of about 14-16 days, being strongly influenced by the WOF daily inlet rate. Further, the model put in evidence that the aerobic section seems able to allow the WOF to achieve a DRIP lower than 1000 mgO2/kgVSh, if an adequate amount of water is added during the process.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
