Integrated Fixed Film Activated Sludge (IFAS) at the Lakeview WWTP The Real Implementation Issues

Ross, Deborah; Fernandes, William; Briggs, Troy; Kim, Nancy; Booth, G.T.; Neely, D.; Welp, Jim

doi:10.2175/193864704784180370

Cited by 7 publications

(8 citation statements)

References 1 publication

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“…The calculated specific nitrification rate of the carriers falls in between 0.2 to 0.5 gN/m 2 .d in the summer, and 0.4 to 0.8 gN/m 2 .d in the winter. The range matches well with values found in the literature measured at the same plant in 2003/04 by Maas et al (2006) and Ross et al (2004), and at other plants (Johnson and McQuarrie (2002); Sen et al (2005)). It can be argued that higher rates in the cold season are a direct result of the assumptions used in the calculation.…”

Section: Comparison Of Treatment Performancesupporting

confidence: 91%

“…They either passed over the screen, or deformed and passed through the screens, and were carried downstream into the final clarifier. To prevent this, screens were enhanced by installing permanent horizontal screens above the vertical screens, and airflows to aiknives were adjusted (Ross et al (2004)). …”

Section: Comparison Of Treatment Performancementioning

confidence: 99%

“…A paper presenting the results from the first 8 months of operation of the Lakeview demonstration project (October 2003to May 2004 has already been published by Ross et al (2004). The present paper focuses on the data collected by plant staff from July 2005 to December 2006.…”

Section: Introductionmentioning

confidence: 99%

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Side-by-Side Comparison of IFAS and CAS Processes at Demonstration Scale at the Lakeview WWTP

Stricker¹,

Barrie²,

Maas³

et al. 2007

proc water environ fed

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A full scale demonstration project of an Integrated Fixed Film Activated Sludge process (IFFAS) with floating biofilm carriers has been operating at the Lakeview wastewater treatment plant (Ontario, Canada) since the fall of 2003. In this study, 18 months of data collected on site from July 2005 to December 2006 are analysed and compared to the performance of a conventional activated sludge (CAS) operated in parallel as a control. Both trains had similar loading and suspended solids concentrations, but the IFFAS had 50% more biomass.In the winter, the conventional train operated at the nitrifier washout limit and had unstable partial nitrification. The IFFAS had more stable ammonia removal, and a doubled average nitrification capacity. In the summer when the suspended SRT was less limiting, the difference between the IFFAS and the CAS nitrification performance was marginal. There are indications that the IFFAS train had slightly improved settling characteristics, but it cannot be established if they were due to the anoxic selector installed at the beginning of the train or to the fixed biomass itself. In this demonstration study, the performance benefits of the IFFAS technology were hampered by recurring operational issues including impaired carrier mixing, seasonal foaming in the winter, challenging carrier transfer during tank maintenance, and carrier containment failures.

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Section: Comparison Of Treatment Performancesupporting

confidence: 91%

Section: Comparison Of Treatment Performancementioning

confidence: 99%

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Side-by-Side Comparison of IFAS and CAS Processes at Demonstration Scale at the Lakeview WWTP

Stricker¹,

Barrie²,

Maas³

et al. 2007

proc water environ fed

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“…Another full-scale study indicated that IFAS reactor provided more stable ammonia removal at low temperature, sludge settleability was slight increased (Stricker et al, 2007). Studies on sludge production and sludge settling characteristics indicated that IFAS produced less activated sludge with better sludge settling performance than conventional activated sludge (Li et al, 2015;Ross et al, 2004). No obvious difference of sludge settleability was observed between a MLE reactor and an IFAS reactor under different carbon/nitrogen (C/N) ratio and DO concentrations (Sriwiriyarat et al, 2008).…”

Section: Impact Of Solids Retention Time On Particle Size Distributiomentioning

confidence: 99%

Impacts of SRT on Particle Size Distribution and Reactor Performance in Activated Sludge Processes

Stenstrom

2018

Water Environment Research

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Particle size distribution of the particulates is an essential characteristic of the wastewater quality. Particle size of activated sludge flocs may affect key sludge handling processes including sedimentation, thickening, digestion, and dewatering. This study evaluated the effects of solids retention time (SRT) on particle size distribution, sludge settleability, effluent turbidity, and removals of chemical oxygen demand (COD) and -N in a lab-scale Modified Ludzak-Ettinger (MLE) reactor and an integrated fixed film activated sludge (IFAS) reactor. This study also surveyed particle size distribution profile of five full-scale water resource recovery facilities (WRRFs), including high purity oxygen (HPO), step-feed nitrification/denitrification (NDN), and MLE NDN processes. This study provides direct evidence of the effects of SRT on particle size distribution and sludge settleability in lab-scale reactors and full-scale WRRFs.

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“…The plant has shown capabilities of N and P removal (Rutt et al 2006). In Ontario, Canada, the Lakeview Wastewater Treatment Plant has been operating as a full-scale IFAS demonstration project (Stricker et al 2009, Maas et al 2008, Ross et al 2004 since August 2003.…”

Section: Troductiomentioning

confidence: 99%

Relationships Between Operational Conditions and Nitrogen Removal and Media Biofilm Accumulation in an IFAS Process Demonstration Study

Regmi¹,

Schafran²,

Rutherford³

et al. 2009

proc water environ fed

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Recent changes in discharge regulations limiting the six James River (VA) Basin treatment plants operated by the Hampton Roads Sanitation District (HRSD) to an aggregate mass discharge of total nitrogen (TN) to 6,000,000 lbs/year by January 1, 2011 has prompted implementation of a strategy to reduce discharges from each of the six treatment plants. At the 16.7 MGD James River Wastewater Treatment Plant (JRTP) modification of the existing conventional activated sludge process to an integrated fixed-film activated sludge (IFAS) process is being considered to achieve a target effluent TN at this facility of approximately 8 mg/L (annual average). To better understand the capabilities of the process and to better design the IFAS system, an IFAS demonstration study at JRTP was conducted to evaluate nutrient removal, temporal and spatial accumulation of biomass on the media, media distribution in the aeration basin, and overall operational conditions and the effect on performance. To accomplish these objectives, one of the nine existing fully-aerobic conventional aeration basins with dedicated secondary clarification was converted to a 1.86 MGD (2.22 MGD max month) IFAS train in a modified Ludzack-Ettinger (MLE) configuration with a 50% fill plastic biofilm carriers in the aerobic zone. During the study, biomass concentrations on the biofilm carriers were monitored as well as nitrogen species concentrations in the IFAS reactor to quantify the nitrogen transformations occurring within the demonstration tank. It was observed that continuous monitoring of the biomass on the IFAS media is necessary for successful operation of IFAS system. The performance of the nitrogen removal process was identified through nitrogen species measurements across the demonstration tank and conducting nitrogen mass balances.

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Integrated Fixed Film Activated Sludge (IFAS) at the Lakeview WWTP The Real Implementation Issues

Cited by 7 publications

References 1 publication

Side-by-Side Comparison of IFAS and CAS Processes at Demonstration Scale at the Lakeview WWTP

Side-by-Side Comparison of IFAS and CAS Processes at Demonstration Scale at the Lakeview WWTP

Impacts of SRT on Particle Size Distribution and Reactor Performance in Activated Sludge Processes

Relationships Between Operational Conditions and Nitrogen Removal and Media Biofilm Accumulation in an IFAS Process Demonstration Study

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