Enhanced Sewage Sludge Disintegration and Nutrients Release by Catalytic Microbubbles Ozonation Using Sewage Sludge-Based Char as Catalyst

Using microbubble ozonation (MO) technique to disintegrate sludge is a promising treatment process. To enhance the lysis and reduction of sludge, catalytic consisting MO sewage derived char (SC) were combined. Total solids (TS), volatile (VS), total nitrogen phosphate (TN TP) selected as main parameters for evaluating performance both in supernatant. With utilization MO, ozone largely improved. At reaction time 90 min, an efficiency exceeding 99% was achieved by using system. The optical dosages 150 mg/g suspended (SS) 1 g/L found lysis, respectively. TS VS concentrations decreased 43% 56%, respectively, compared those 16.7% 17.9% obtained with alone under condition solution pH 4. supernatant soluble chemical oxygen demand (SCOD), TN, TP, NH4+-N NO3−-N increased 1750%, 205%, 25%, 31% 43%, A small amount additional SC exhibited strong activity on dissolving organic matter demonstrating positive effect caused heterogeneous disintegration.