Making Classifying Selectors Work for Foam Control in the Activated Sludge Process

Parker, Denny; Geary, Steve; Jones, G. A.; McIntyre, Lori; Oppenheim, Stuart; Pedregon, Vick; Pope, Rod; Richards, Tyler; Voigt, C.; Volpe, Gary; Willis, John; Witzgall, Robert

doi:10.2175/193864701790860074

Cited by 7 publications

(17 citation statements)

References 3 publications

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“…Although the use of selectors has proven sound but due to challenges of removal of a difficult material from the aeration tanks, still classifying selectors have limitation for foam reduction (Parker et al, 2003). …”

Section: Anaerobic Selectorsmentioning

confidence: 99%

“…The skimming system should be positioned at proper locations where forward momentum in the reactor and the floating material will flow to the central position (E.g. exit end of aeration basins or location where natural baffling occurs).The effectiveness of the skimming system may be augmented by placing surface baffles to encourage the movement of material at the surface of the liquid toward the foam removal weir(s) (Parker et al, 2003).…”

Section: Skimming Systemmentioning

confidence: 99%

“…For the centrifugal type of pump, decreasing motor amps or closure of the discharge check valve can be used. It terminates the operation for when the sump empties (Parker et al, 2003) …”

Section: Pump Inlet Systemmentioning

confidence: 99%

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Causes and remedies for filamentous foaming in activated sludge treatment plant

Pal¹,

Khairnar²

2014

Issue 4

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This paper reviews the problem of foaming associated with the activated sludge process and its control using various physical, chemical and biological methods. Activated sludge process is widely used for treatment of every type of wastewater like industrial, domestic and municipal wastewater. This process is driven by a complex microbial population, among which some mycolic acid containing bacteria leads to the stable foam formation which ultimately results in poor efficiency of the plants and leading to major environmental, operational, and health problems. A number of researches provide the evidences of foaming in wastewater treatment plants and its control using physical, chemical and biological methods. Current approaches for controlling foam includes operational adjustments, additional structures, controlling dissolved oxygen levels, water sprays, steam application, polymer addition, chlorination and a novel and ecofriendly approach that is treatment of filamentous bacteria with the specific phages. A detailed study of all methods is presented and collectively described in this review paper for a better understanding of the foam controlling strategies.

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Section: Anaerobic Selectorsmentioning

confidence: 99%

Section: Skimming Systemmentioning

confidence: 99%

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Causes and remedies for filamentous foaming in activated sludge treatment plant

Pal¹,

Khairnar²

2014

Issue 4

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“…This could decrease the effective SRT of Nocardioform organisms below the system SRT and enhances washout (Parker, et al, 2001).…”

Section: Foam Managementmentioning

confidence: 99%

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

Jolis¹,

Jones²,

Ho³

et al. 2003

proc water environ fed

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Solids retention time (SRT), biological scum trapping and recycle and the dynamic equilibrium between Nocardioform populations in the foam and the ML are the controlling factors in activated sludge foaming events caused by Nocardioform bacteria. The combination of selective wasting and SRT control can ensure long-term foam control to the operation of a pure-oxygen activated sludge system. Polymer addition to the ML, followed by selective wasting of foam can cure a severely foaming ML in a matter of weeks provided the SRT remains below 1.5 days. SRT control and selective wasting will also alleviate a severely foaming ML, but effects will only be observed after three or four months after implementation. A SRT of 0.3 days will result in the complete wash out of Nocardioform bacteria from the activated sludge system, which can then operate at a SRT of 3 days free of Nocardioform.

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“…Although filamentous microorganisms support the activated sludge floc formation, their overabundance in WWTPs causes considerable operational difficulties such as poor sludge settling and thickening (Cydzik-Kwiatkowska and Zielińska, 2016;Pal et al, 2014). Different strategies have been employed to control foaming, including polymer addition, the application of disinfectants such as chlorine, and the use of foam-classifying selectors to skim and remove foaming bacteria (Parker et al, 2003). The use of bacteriophages to reduce the concentration of filamentous bacteria is one of the most promising environmentally friendly approaches to control foaming (Liu et al, 2015).…”

mentioning

confidence: 99%