Effective Biofilm Control on High Surface Density Vertical-Flow Structured Sheet Media for Submerged Applications

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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.

Section: Methodsmentioning

confidence: 99%

Section: Introduction Backgroundmentioning

confidence: 99%

Section: Introduction Backgroundmentioning

confidence: 99%

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

Zhu¹,

Kulick²,

Koch³

2011

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“…The proprietary distribution media plays a key role in maximizing the water/air distribution in the media tower therefore enhancing the aeration/mixing efficiency within the reactor (Ye et al, 2010a;2010b). Compared to the conventional cross-flow media, the VF-DM has 2-3 times higher specific surface area (up to 90 …”

Section: High Surface Area Density Vertical Flow-distribution Media (mentioning

confidence: 99%

Pilot Study of Submerged Structured Sheet Media for Tertiary Nitrification

Zhu¹,

Li²,

Frank³

et al. 2012

This study evaluated the nitrification performance of a combined high surface area density vertical flow and distribution media (VF-DM) system in a tertiary fixed-bed biofilm reactor (FBBR) at the City of Reading WWTP in Pennsylvania. A low HRT of 2 hrs was selected to represent the HRT of the existing tertiary nitrification basins at the design flow. The effluent ammonia nitrogen NH 3 -N concentration from the pilot FBBR was consistently lower than the plant's final permit effluent limits.An average of 95% NH 3 -N removal was achieved in the FBBR system for an ammonia loading up to 1.3 g/m 2 -day at wastewater temperatures of 10-23 o C. The highest NH 3 -N surface removal rate observed was 1.6 g/m 2 -day at the loading rate of 2.2 g/m 2 -day and wastewater temperature of 14.9 o C.The NH 3 -N removal capacity of the pilot system was significantly higher (2-4 times) than that of the existing treatment plant's tertiary nitrification system. The increased capacity of the pilot system was primarily attributed to the application of proprietary distribution media (DM), which not only maximized the air and wastewater distribution over the entire surface area of the media, but also optimized the airlift pumping through the VF media for sufficient mixing and effective biomass control. In addition, the media used in the pilot system had a much higher surface area (80 ft 2 /ft 3 or 262 m 2 /m 3 ) compared to the media in the existing plant (30 ft 2 /ft 3 or 98 m 2 /m 3 ), which allowed more biomass attachment and therefore increased the overall system capacity.

“…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).…”

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

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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).