Application of Structured Sheet Media IFAS for Ammonia Polishing From a Trickling Filter Solids Contact Process

Flamming, James J.; Woodman, David L.; Kulick, Frank M.

doi:10.2175/193864711802765318

Cited by 3 publications

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“…The WWTP utilizes a TF/SC process for secondary treatment of their wastewater. The plant was retrofitted with an SSM IFAS system in 2009 to resolve the ammonia discharge permit violation issues (Flamming et al 2011). The secondary treatment system includes three trickling filters operated in parallel.…”

Section: Coldwater Wwtp Coldwater MImentioning

confidence: 99%

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confidence: 99%

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Assessment of Oxygen Transfer, Uptake and Energy Footprint of Full Scale SSM IFAS Systems using Off-gas Testing

Li¹,

Zhu²,

Kulick³

et al. 2013

proc water environ fed

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Structured sheet media (SSM) integrated fixed-film activated sludge (IFAS) systems have been installed in various existing wastewater treatment plants for enhanced secondary and/or tertiary nitrification especially for under cold weather conditions (Ye et al., 2010c;Flamming et al., 2011;Zhu et al., 2012a and2012b). The SSM IFAS systems have demonstrated to be compatible with fine bubble diffusers for enhanced biofilm control and oxygen transfer efficiency with dedicated airlift pumping and scouring over the entire media surface (Ye et al., 2009(Ye et al., , 2010a(Ye et al., , 2010b. The impact of SSM on fine bubble diffuser oxygen transfer efficiency (OTE) in clean water has previously been studied (Zhu et al., 2011). The oxygen transfer, uptake and aeration air use of full scale SSM IFAS systems, however, have not been explored in the past. This paper presents the findings of off-gas testing at the Cocalico Valley Poultry Farm (CVPF), PA, Spring Township, PA and Coldwater, MI wastewater treatment plants (WWTPs).

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Section: Coldwater Wwtp Coldwater MImentioning

confidence: 99%

“…

…”

mentioning

confidence: 99%

Assessment of Oxygen Transfer, Uptake and Energy Footprint of Full Scale SSM IFAS Systems using Off-gas Testing

Li¹,

Zhu²,

Kulick³

et al. 2013

proc water environ fed

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“…Adding structured sheet media to existing activated sludge processes has proved to effectively improve the nitrification performance (Ye, et al, 2010c;Flamming, et al, 2011). The improvement in nitrification may be attributed to the media's ability to retain numerous bacterial populations including nitrifiers.…”

Section: Process Typementioning

confidence: 99%

Impact of Structured Sheet Media on the Oxygen Transfer Efficiency of Fine and Coarse Bubble Diffusers

Zhu¹,

Kulick²,

Koch³

2011

proc water environ fed

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This study investigated the impact of structured sheet media on standard oxygen transfer efficiencies in clean water (SOTE CW ) using coarse and fine bubble diffusers. The primary goal of this study was to determine the impacts of structured sheet media at standard, full-scale configurations on the oxygen transfer efficiency of diffusers in terms of different diffuser types, media tower depths, and aeration intensities in a clean water environment.Results showed that fine bubble diffusers' standard oxygen transfer efficiencies were significantly higher than those of coarse bubble diffusers in the presence of structured sheet media. The presence of structured sheet media may increase coarse-bubble diffuser efficiency design values by 5-50% and decrease fine-bubble diffuser efficiency by 2-30% for conditions tested. Oxygen transfer efficiency impacts exerted by free-floating media and structured-sheet media were also compared in this paper.

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Practical experience with full-scale structured sheet media (SSM) integrated fixed-film activated sludge (IFAS) systems for nitrification

Li¹,

Zhu²,

Flamming

et al. 2014

Water Science and Technology

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Many wastewater treatment plants in the USA, which were originally designed as secondary treatment systems with no or partial nitrification requirements, are facing increased flows, loads, and more stringent ammonia discharge limits. Plant expansion is often not cost-effective due to either high construction costs or lack of land. Under these circumstances, integrated fixed-film activated sludge (IFAS) systems using both suspended growth and biofilms that grow attached to a fixed plastic structured sheet media are found to be a viable solution for solving the challenges. Multiple plants have been retrofitted with such IFAS systems in the past few years. The system has proven to be efficient and reliable in achieving not only consistent nitrification, but also enhanced bio-chemical oxygen demand removal and sludge settling characteristics. This paper presents long-term practical experiences with the IFAS system design, operation and maintenance, and performance for three full-scale plants with distinct processes; that is, a trickling filter/solids contact process, a conventional plug flow activated sludge process and an extended aeration process.

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Application of Structured Sheet Media IFAS for Ammonia Polishing From a Trickling Filter Solids Contact Process

Cited by 3 publications

References 0 publications

Assessment of Oxygen Transfer, Uptake and Energy Footprint of Full Scale SSM IFAS Systems using Off-gas Testing

Assessment of Oxygen Transfer, Uptake and Energy Footprint of Full Scale SSM IFAS Systems using Off-gas Testing

Impact of Structured Sheet Media on the Oxygen Transfer Efficiency of Fine and Coarse Bubble Diffusers

Practical experience with full-scale structured sheet media (SSM) integrated fixed-film activated sludge (IFAS) systems for nitrification

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