Application of peroxymonosulfate-ozone advanced oxidation process for simultaneous waste-activated sludge stabilization and dewatering purposes: A comparative study

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 oz...

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Bibliographic Details
Published in:Journal of environmental management 2018-01, Vol.206, p.523-531
Main Authors: Badalians Gholikandi, Gagik, Zakizadeh, Nazanin, Masihi, Hamidreza
Format: Article
Language:English
Subjects:
Advanced oxidation process
Hydrogen peroxide-ozone
Peroxymonosulfate-ozone
Persulfate-ozone
Sludge dewatering
Sludge stabilization
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Summary: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. •The Peroxymonosulfate-Ozone method is capable of simultaneous production of sulfate and hydroxyl radicals.•The Peroxymonosulfate-Ozone method has the capability of stabilizing and dewatering the sludge simultaneously.•Reduction of The TB-EPS (tightly bound-extracellular polymeric substances) and negative zeta potential led to the improvement of dewatering condition.•Increasing LB-EPS (loosely bound-extracellular polymeric substances) and decreasing particle size of the sludge let to reducing dewaterability.
ISSN:0301-4797
1095-8630
DOI:10.1016/j.jenvman.2017.10.070