| Abstract |
This paper presents the results of a study on the effects of different conditioning methods on the filtration properties of sludge, that is, specific resistance, efficiency, and filtration rate. Sludge conditioning was carried out using a thermal method, sonication, and a combination of the previous methods known as hybrid conditioning. Tests were conducted for both undigested sludge and sludge digested in laboratory flasks. The conditioning methods used reduced filtration efficiency and filtration rate. The digestion process was a factor in increasing the parameters studied. The lowest filtration resistance was obtained when the sludge was conditioned using an ultrasonic field of 31.54 and 39.42 mu m, resulting in values of 4.37-4.29 x 10(12) m/kg on day 5 of the process. At these wavelengths, the sludge also showed the highest filtration rate. During thermal conditioning, resistance increased with increasing temperature. The stabilisation process did not result in major changes in filtration resistance. At a temperature of 80 degrees C, a decrease in the discussed indicator was observed. |
