Chemical disintegration of waste activated sludge by persulfate oxidation

In this thesis, the waste-activated sludge sampled from the wastewater treatment plant of a canned food factory was disintegrated with non-activation PMS chemical and with PMS chemical activated with 3 different activation methods. To determine the optimum conditions for the disintegration of the waste activated sludge, PMS + thermal method (45, 60, and 75oC), PMS + alkaline method (pH 9, 10, and 11), PMS + ultrasonic bath method (15, 30, and 60 min) and non-activation PMS was used at different doses. As a result of the disintegration of the sludge; The SCOD, protein, and carbohydrate concentrations increased. 0.750% PMS dose for non-activation PMS method, 0.250% PMS dose and 75oC temperature value for PMS+thermal method, 0.250% PMS dose and pH 11 value for PMS+alkaline method, 0.125% PMS dose and 60 min ultrasonic bath time for PMS+ultrasonic method were determined as optimum working conditions. Among these disintegration methods, the methods that cause the highest SCOD concentration; are listed as PMS+ultrasonic method, PMS+alkaline method, PMS+thermal method, and non-activation PMS method. The sludge was disintegrated under optimum conditions and biogas generation potentials were compared with BMP tests. According to the BMP test results methane production; in PMS+ultrasonic method, PMS+thermal method, PMS+alkaline method, and non-activation PMS method was determined as 131, 119, 113, and 73 ml, respectively. In terms of total energy consumption are listed as PMS+ultrasonic method > PMS method without activation > PMS+thermal method > PMS+alkaline method. The PMS+ultrasonic method, which caused the highest SCOD concentration and the highest methane production, resulted in the highest energy consumption. Instead of this method, the "PMS+alkaline method (pH 11+0.250% PMS)", which causes high SCOD concentration, can be recommended as it produces high methane and causes the lowest energy consumption.