Application of peroxymonosulfate-ozone advanced oxidation process for simultaneous waste-activated sludge
Gagik Badalians Gholikandi1, Nazanin Zakizadeh1, Hamidreza Masihi1
1Faculty of Civil, Water and Environmental Engineering, Shahid Beheshti University, A.C., Tehran, Iran.
Abstract:
In this study, the efficiency of the Peroxymonosulfate-ozone (PMS+O3) advanced oxidation process in lab scale by the aim of stabilization and dewatering the biological excess sludge was investigated and the results were compared with persulfate-ozone (PS+O3), hydrogen peroxide-ozone (H2O2+O3) and ozonation (O3) processes. The results show that the PMS+O3 is more effective than other mentioned procedures. Therefore, under optimized conditions (pH = 11, PMS/O3 = 0.06 and Dose O3 = 12.5 mmol), VS (Volatile solids) and fecal coliforms reduced respectively 42% and 89% after 60 min and the stabilized sludge in term of pathogen reduction requirements was class B. Furthermore, time to filter (TTF) of sludge decreased 70% relative to the raw sludge. In order to demonstrate the dewatering conditions' improvement, the variations of particle size distribution, extracellular polymeric substances (EPS) and zeta potential were evaluated. Overall, the results show that the PMS+O3 has the capability of stabilizing and dewatering the sludge simultaneously.
Related Concept Videos
01:46Oxidative Cleavage of Alkenes: Ozonolysis
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
02:37Oxidation of Alcohols
The process of oxidation in a chemical reaction is observed in any of the three forms:
01:21Radical Oxidation of Allylic and Benzylic Alcohols