converting mbbr to ifas anita moxto thp...4/25/2019 1 converting mbbr to ifas anita moxto improve...
TRANSCRIPT
4/25/2019
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Converting MBBR to IFAS ANITA Mox to Improve Treatment of THP sidestream
Meg Hollowed
Process Engineer
Veolia Water Technologies
Sundet WWTP is a resource recovery facility
THP
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Sundet ANITA Mox Design• 2012 • Installed MBBR after conventional AD • Avg N load 142 kg/d
• 2014 • Installed thermal hydrolysis before AD• N load maintained with dilution
• 2018 • Converted sidestreamMBBR to IFAS
Thermal Hydrolysis
• Hydrolysis of organic material at high temperature and pressure
• Makes nutrients more readily available for utilization in anaerobic digestion • Improves gas production
• Easier to mix • Increase digester loading rates
• Reduces odors
• Produces quality biosolid for land application
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Thermal Hydrolysis
• Increases nutrient load in liquid stream• Increased load back to mainstream
• High temperature and pressure create byproducts that are inhibitory to bacteria
Converting MBBR to IFAS• MBBR = Moving Bed Bioreactor• Use of polyethylene media to foster and house biofilm for wastewater treatment
• IFAS = Integrated Fixed Film Activated Sludge• Use of return activated sludge (RAS) to create an environment of both biofilm and suspended biomass for wastewater treatment
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Converting MBBR to IFAS
Converting MBBR to IFAS
• Benefits of IFAS after THP• Reduced mass transfer limitation
• Increased N‐removal rate
• BOD removal in MLSS• OHO and AOB mainly present in bulk liquid
• Reduced dilution• Additional method of NOB control (MLSS wasting)
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Converting MBBR to IFAS
Results: Past and Present
→ Conven onal sidestream
→ THP (MBBR)
• Influent• Higher influent NH4• Load controlled by dilution
• Effluent• 100 mg/L NH4 vs 150 mg/L
• 88% NH4 removal since startup
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Results: Past and Present
• Limited data as IFAS
• Gradually increasing load
• Gradually reducing • Dilution• MLSS
• Plant observations
Conclusions
• ANITA Mox MBBR • Is it capable of treating centrate after THP?
• ANITA Mox IFAS• Capable• More stable / easier to operate
• Less dilution water
• Easy to convert MBBR to IFAS
• Sundet WWTP is please with new operation
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Acknowledgements & Questions
Many thanks:
• Sundet WWTP personnel
• AnoxKaldes/Veolia Technical Department
Questions