Holistic sludge management through ozonation: A critical review
Galilee U Semblante1, Faisal I Hai1, Dionysios D Dionysiou2
1Strategic Water Infrastructure Laboratory, School of Civil, Mining and Environmental Engineering, University of Wollongong, Wollongong, NSW, 2522, Australia.
Journal of Environmental Management
|November 6, 2016
Summary
Ozonation in wastewater treatment reduces sludge and removes contaminants. Resource recovery from sludge, like phosphorus retrieval, can offset operational costs and improve sustainability.
Area of Science:
- Environmental Engineering
- Water Treatment Technologies
- Chemical Oxidation Processes
Background:
- Wastewater treatment faces challenges with sludge management and emerging contaminants.
- Ozonation is an advanced oxidation process with potential benefits for wastewater treatment.
- Current literature highlights ozonation's effects on sludge properties and contaminant removal.
Purpose of the Study:
- To critically review the multidimensional benefits of ozonation in wastewater treatment.
- To explore sludge reduction, trace organic contaminant removal, and resource recovery via ozonation.
- To assess the impact of ozonation on sludge characteristics and effluent quality.
Main Methods:
- Literature review of studies on ozonation in wastewater treatment plants.
- Analysis of factors influencing sludge solubilisation and biomass yield reduction.
- Evaluation of ozonation's efficacy in removing trace organic contaminants (TrOCs).
- Investigation of resource recovery potential from ozonated sludge supernatant.
Main Results:
- Ozonation leads to sludge solubilisation and reduced biomass yield, influenced by ozone dosage and sludge characteristics.
- Sludge ozonation effectively removes emerging trace organic contaminants (TrOCs).
- Ozonation increases supernatant Chemical Oxygen Demand (COD) and nutrient levels due to cell lysis, potentially impacting effluent quality.
- Successful phosphorus recovery from ozonated sludge supernatant has been demonstrated.
Conclusions:
- Ozonation offers significant benefits including sludge reduction and TrOC removal in wastewater treatment.
- Addressing the negative impact on effluent quality requires integrated resource recovery strategies.
- Resource recovery, particularly phosphorus, can enhance the economic viability of ozonation, promoting wider adoption.
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