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The dielectric properties, namely the dielectric constant and the dielectric loss factor are important for predicting the behavior of materials during microwave processing, because both of them determine the interaction between the molecules with the oscillating electromagnetic field. Because the dielectric properties are not known for food industry sludge, our main aim was to measure the dielectric constant and dielectric loss factor for meat industry sludge, and to investigate the correlation between the dielectric parameters and the biodegradability indicators. Our experimental results show, that despite of the high moisture content of sludge, temperature depending behavior of ’ was different that of can be known for water. Sludge had a decreasing tendency in the temperature range of 20-60 ̊C, but over a critical value of the temperature increasing induced an increment in the value of ’. Our experimental results verified that the change of sCOD/tCOD has a good linear correlation with the dielectric loss factor. Similar to the trends determined for the solubility change, a good correlation was found between the dielectric loss factor and the change of biodegradability measured by the BOD/tCOD parameter. Our experimental results verified that the change in the value of dielectric loss factor correlate with the disintegration degree and the biodegradability of sludge, as well Correlation between the electrical parameters and biodegradability indicators enable to develop a real-time and inline measuring and control system for batch and continuous flow microwave sludge conditioning technology.

Correlation between dielectric properties and aerobic biodegradability of meat processing