Biological Foam Management Strategies at a Pure-Oxygen Activated Sludge Plant With No Selector Technology

Jolis, Domènec; Jones, Bonnie M.; Ho, Chu-Fei H.; Pitt, Paul

doi:10.2175/193864703784755274

Cited by 5 publications

(7 citation statements)

References 6 publications

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“…Total Solids (TS) concentrations of two to three times that in the digesting sludge have been reported during digester foaming episodes in Phoenix (Jacobs, 2008), Sacramento (Pagilla, 1997) and San Francisco (Jolis, 2003). This results in a longer SRT for solids in the foam layer.…”

Section: The Phenomenon Of "Foaming" and When It Becomes A Problem Inmentioning

confidence: 99%

“…The filaments become incorporated in the waste sludge (WAS) and are "seeded" into the digester as part of the feed solids. A number of wastewater utilities have reported digester foaming problems in recent years which they attributed to filamentous organisms (Ghosh, 1995;Jacobs, 2008;Jolis, 2003;Pagilla, 1997). In all likelihood, many more filament-induced foaming incidents have been experienced at other locations, but filaments have gone unnoticed as the primary cause.…”

Section: Foaming Scenario Type 2: Filamentous Organisms Seeded Into Amentioning

confidence: 99%

“…At the 23 rd Avenue plant, selectors have been found to be highly effective in inhibiting filamentous bulking in the activated sludge process. Jolis et al (2003) reported on digester foaming problems at the Oceanside plant in San Francisco, which they attributed to seeding into the digesters of Nocardia from the plant's High Purity Oxygen Activated Sludge (HPOAS) system. HPOAS systems are susceptible to foaming, according to the authors, because the configuration of the totally covered reactors results in significant surface trapping of filaments and foam.…”

Section: Foaming Scenario Type 2: Filamentous Organisms Seeded Into Amentioning

confidence: 99%

See 2 more Smart Citations

Coping with Digester Foaming in an Age of Increasing Incidence

Shimp¹,

Kobylinski²,

Rowan³

et al. 2009

proc water environ fed

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Digester foaming is poorly understood. An increasing number of wastewater utilities are experiencing significant disruption of both liquid stream treatment and solids processing operations as a result of foaming episodes and, in some cases, costly structural damage to their digesters. A review of the literature indicates that we should anticipate increased foaming problems in the future as the use of biological nutrient removal (BNR) and membrane (MBR) processes become more prevalent, and as utilities operate at lower DO concentrations to contain operating costs and reduce their carbon footprint. This paper reviews research findings and actual operating experience related to digester foaming and describes foam formation and its behavior inside the digester. Measures to reduce the impacts of digester foaming such as changes in digester operational practices and facility and equipment modifications that can make a digestion complex more "foam tolerant" are reviewed, along with the prospects for their success based on observations at operating plants. Merely optimizing operational practices may not be sufficient in all cases, and some wastewater utilities have opted to make major process changes in an effort to reduce digester foaming. Early operating experience with two phase digestion, in particular, has shown considerable promise at several treatment plants with long histories of foaming in conventional digestion systems. Short of undertaking major capital improvements to effect process changes, there are more modest steps that can be taken to reduce the potential for facility damage and disruption from digester foaming.

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Section: The Phenomenon Of "Foaming" and When It Becomes A Problem Inmentioning

confidence: 99%

Section: Foaming Scenario Type 2: Filamentous Organisms Seeded Into Amentioning

confidence: 99%

Section: Foaming Scenario Type 2: Filamentous Organisms Seeded Into Amentioning

confidence: 99%

See 1 more Smart Citation

Coping with Digester Foaming in an Age of Increasing Incidence

Shimp¹,

Kobylinski²,

Rowan³

et al. 2009

proc water environ fed

View full text Add to dashboard Cite

show abstract

“…), a cause‐effect relationship for mixed liquor foaming is still unavailable. However, several methods have been identified to control foaming in activated sludge ( Jolis et al, 2006 ; Pagilla et al, 1994 ). Physical methods include the use of classifying selectors and selective foam wasting from the aeration basins or secondary clarifiers.…”

Section: Introductionmentioning

confidence: 99%

Effects of Anaerobic Selector Hydraulic Retention Time on Biological Foam Control and Enhanced Biological Phosphorus Removal in a Pure‐Oxygen Activated Sludge System

Jolis

Mitch²,

Marneri³

et al. 2007

Water Environment Research

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Increased anaerobic selector hydraulic retention times (HRTs) in a high-purity oxygen activated sludge process resulted in an increase in soluble orthophosphate release and biodegradable chemical oxygen demand removal, confirming that enhanced biological phosphorus removal occurs at aeration solids retention times (SRTs) below 1.7 days. Under operating conditions that included biological foam trapping and recycling, an anaerobic selector with HRTs higher than 55 minutes resulted in a decrease in filament counts and effective foam control. Effective norcardioform control is achieved through the combination of metabolic selective pressure and increased soluble organic substrate removal in the anaerobic selector and low aeration SRT. Water Environ. Res., 79, 472 (2007).

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“…), a cause-effect relationship for ML foaming is still unavailable. However, several methods have been identified to control foaming in activated sludge (Pagilla, et al, 1994;Jolis, et al, 2004). Physical methods include the use of classifying selectors and selective foam wasting from the aeration basins or secondary clarifiers.…”

Section: Introductionmentioning

confidence: 99%

Effect of Anaerobic Selector Hydraulic Retention Time on Biological Foam Control

Jolis¹,

Mitch²,

Marneri³

et al. 2005

proc water environ fed

Self Cite

View full text Add to dashboard Cite

Increased anaerobic selector hydraulic retention times (HRTs) in a high-purity oxygen activated sludge process resulted in an increase in soluble orthophosphate release and biodegradable COD removal at aeration solids retention times (SRTs) ranging from 1.1 and 1.7 days. Under operating conditions that included biological foam recycling, a well established phosphorus accumulating organism community was observed at HRTs higher than 55 minutes that resulted in a decrease in filament counts and foam stability, providing effective operating conditions for foam control. While enhanced biological phosphorus removal was observed at HRTs between 20 and 60 minutes, its effectiveness with respect to foam control was compromised due to excessive foam trapping and recycling. Thus, increased anaerobic selector HRTs and low aeration SRTs can provide effective measures for biological foam control under conditions that minimize the impacts of foam trapping or that eliminate biological foam recycling.

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Biological Foam Management Strategies at a Pure-Oxygen Activated Sludge Plant With No Selector Technology

Cited by 5 publications

References 6 publications

Coping with Digester Foaming in an Age of Increasing Incidence

Coping with Digester Foaming in an Age of Increasing Incidence

Effects of Anaerobic Selector Hydraulic Retention Time on Biological Foam Control and Enhanced Biological Phosphorus Removal in a Pure‐Oxygen Activated Sludge System

Effect of Anaerobic Selector Hydraulic Retention Time on Biological Foam Control

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