Abstract:
This research focuses on the study of factors affecting the extraction of water from the sewage sludge. The idea is to improve the dewaterability by microwave and polymer. It is a method that can be applied to improve the dewatering characteristics of sludge. This method uses molecular rotation principle, which can cause heat to build up rapidly and cause modifications to the structure of the sludges. This would cause water to come out of sludge. Sludge used in the experiment, were form Din Dang, Nong Khaem, Rattanakosin, Chong Nonsi, Si Phraya. The volatile suspended solids were 9,034 ±15.27 4,779 ±102.14 4,621 ±15.28 3,511 ±15.28 and 3,328 ±92.38 mg/L, respectively, The volatile suspended solids were related to specific resistance to filtration and was found to be 13.23 4.46 3.48 0.58 and 0.28 × 1012m/kg. For the sludge dewaterability improvement, the experiment used power levels of 500, 600 and 900 watts at 60, 100 and 120 seconds. The results showed that the optimum conditions for the improvement of dewaterability was at time = 120 sec and power = 900 W, The SRF were 5.26 2.88 1.92 0.41 and 0.17 × 1012 m/kg, for Din Dang, Nong Khaem, Rattanakosin, Chong Nonsi, Si Phraya, respectively. For with cationic polymer, we used polymer at 0.4 0.5 0.6 0.7 0.8 and 1.0 mg/g of total solids. Optimal condition was 0.8 mg/g. The specific filtration resistance (SRF) equaled to 5.64 and 2.58 × 1012 m/kg for Din Dang, Nong Khaem, respectively. For sludge microwave pretreatment, conditions were not optimal due to the limitations of the microwave available commercially.