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Microwave enhanced advanced oxidation process (MW/H₂O₂-AOP) treatment of sewage sludge at different pH conditions Tunilė, Indrė
Abstract
The primary focus of this study was to investigate the effectiveness of a microwave-enhanced advanced oxidation process (MW/H₂O₂-AOP) for treating sludge from a membrane-enhanced biological phosphorus removal process in neutral, acidic (pH 4) and alkaline (pH 9) conditions. Two different MW systems were utilized; the bench-scale (2450 MHz) and pilot-scale (915 MHz) systems that operate in batch-mode and continuous-flow mode, respectively. The effects of pH on solids disintegration, nutrient release and the physical properties of sludge were examined. The MW/H₂O₂-AOP treatment was very effective; the total suspended solids reduction and chemical oxygen demand solubilization was better for alkaline sets rather than acidic. However, acidic conditions were superior in the release of orthophosphate, particle size distribution, dewatering properties and settling. In the treatment of acidified dairy manure, with the 915 MHz pilot-scale system at temperatures of 90 and 110°C and with a hydrogen peroxide dosage of 0.6% (v/v) per percent of total solids, the MW/H₂O₂AOP yielded a clear supernatant, rich in the nutrients required for struvite (MgNH₄PO₄·6H₂O₂) crystal formation. A total of fifteen salt water experiments were conducted with a salt concentration ranging from 10 to 120 g/L at three different flow rates (6, 7.5 and 9 L/min). The dominant heating mechanism was dipolar polarization and ionic conduction at a high flow rate and high salt concentration, respectively. High concentrations of ions suppressed the dielectric polarization, resulting in lower temperatures. Energy consumption was similar among the sets.
Item Metadata
Title |
Microwave enhanced advanced oxidation process (MW/H₂O₂-AOP) treatment of sewage sludge at different pH conditions
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2018
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Description |
The primary focus of this study was to investigate the effectiveness of a microwave-enhanced
advanced oxidation process (MW/H₂O₂-AOP) for treating sludge from a
membrane-enhanced biological phosphorus removal process in neutral, acidic (pH 4) and
alkaline (pH 9) conditions. Two different MW systems were utilized; the bench-scale (2450
MHz) and pilot-scale (915 MHz) systems that operate in batch-mode and continuous-flow
mode, respectively. The effects of pH on solids disintegration, nutrient release and the
physical properties of sludge were examined. The MW/H₂O₂-AOP treatment was very
effective; the total suspended solids reduction and chemical oxygen demand solubilization
was better for alkaline sets rather than acidic. However, acidic conditions were superior in
the release of orthophosphate, particle size distribution, dewatering properties and settling.
In the treatment of acidified dairy manure, with the 915 MHz pilot-scale system at
temperatures of 90 and 110°C and with a hydrogen peroxide dosage of 0.6% (v/v) per
percent of total solids, the MW/H₂O₂AOP yielded a clear supernatant, rich in the nutrients
required for struvite (MgNH₄PO₄·6H₂O₂) crystal formation.
A total of fifteen salt water experiments were conducted with a salt concentration
ranging from 10 to 120 g/L at three different flow rates (6, 7.5 and 9 L/min). The dominant
heating mechanism was dipolar polarization and ionic conduction at a high flow rate and
high salt concentration, respectively. High concentrations of ions suppressed the dielectric
polarization, resulting in lower temperatures. Energy consumption was similar among the
sets.
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Genre | |
Type | |
Language |
eng
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Date Available |
2018-04-16
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0365709
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2018-05
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Campus | |
Scholarly Level |
Graduate
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Rights URI | |
Aggregated Source Repository |
DSpace
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Rights
Attribution-NonCommercial-NoDerivatives 4.0 International