Controlling sludge settleability in the oxidation ditch process

Hartley, Ken

doi:10.1016/j.watres.2007.10.017

Cited by 18 publications

(12 citation statements)

References 6 publications

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“…Data from the Coolum oxidation ditch BNR plant (Figure 4.8) are consistent with this model (Hartley, 2008). The ditch was preceded by an anaerobic reactor (process mass fraction 0.10) for biological phosphorus removal.…”

Section: Influent Rbcodsupporting

confidence: 68%

“…He found that SSVI was a minimum at an optimum ammonia:nitrate ratio and increased at higher and lower ratios, as shown in Figure 4.8. (Hartley, 2008). (Hartley, 2008).…”

Section: Anoxic Fractionmentioning

confidence: 99%

“….11 Relationship between effluent SS and SVI for three different process types, conventional activated sludge, ND continuous feed intermittent decant (Hartley & Lant, 2010) and NDEBPR oxidation ditch (Hartley 2008). .11 Relationship between effluent SS and SVI for three different process types, conventional activated sludge, ND continuous feed intermittent decant (Hartley & Lant, 2010) and NDEBPR oxidation ditch (Hartley 2008).…”

Section: Foamingmentioning

confidence: 99%

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Tuning Biological Nutrient Removal Plants

2013

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Section: Influent Rbcodsupporting

confidence: 68%

“…He found that SSVI was a minimum at an optimum ammonia:nitrate ratio and increased at higher and lower ratios, as shown in Figure 4.8. (Hartley, 2008). (Hartley, 2008).…”

Section: Anoxic Fractionmentioning

confidence: 99%

Section: Foamingmentioning

confidence: 99%

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Tuning Biological Nutrient Removal Plants

2013

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“…To take into account the effect of bulking on the settling parameters, the model suggested by Hartley (2008) is used ( Fig. 3):…”

Section: Secondary Clarifiermentioning

confidence: 99%

Modeling and simulation of a carrousel for long-term operation

Pons

Mourot

Ragot

2011

IFAC Proceedings Volumes

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Following the directions set by the International Water Association for the development of benchmarks to compare control strategies and fault detection methods in activated sludge plants, a carrousel benchmark has been developed. It is based on a real plant (Golbey-Epinal, France), on which wastewater characteristics were measured. The model incorporate sludge bulking effects based in the ratio ammonia-to-nitrate in the effluent and inhibition effects due to the possible presence of toxicants in the influent.

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“…In the investigation conducted by Hartley [16], the author described the design and implementation of a process for settling the sludge deposits. By using a single-phase model, Gancarski [17] studied the settling of sludge on the basis of tracking the particles.…”

Section: Introductionmentioning

confidence: 99%

Study on Propellers Distribution and Flow Field in the Oxidation Ditch Based on Two-Phase CFD Model

Zhang

et al. 2019

Water

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The oxidation ditch (OD) plays an important role in wastewater treatment plants. With increasing demand and production costs, the energy consumption and sludge deposition occurring in the OD must be diminished to enhance its development. In this paper, a two-phase computational fluid dynamics (CFD) model of water and activated sludge examined the flow field characteristics of an OD, consisting of two side-by-side propellers. The system was studied under five configurations, where the spacing between the propellers was set equal to −0.2, −0.1, 0, 0.1, 0.2 times the length of the OD. The viscosity and settling rate of activated sludge was imported in the numerical simulation through a user defined function (UDF). The optimal scheme of the propeller’s power consumption, velocity distribution, and sludge concentration distribution was obtained. The result shows that sludge concentrations are linked with dead zone velocity but not necessarily with low velocities. Experiments confirmed the validity of the velocity flow field simulated by the two-phase CFD model. Overall, these findings form the basis for the propellers distribution optimization and allow a deeper insight into the flow field of OD systems.

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Controlling sludge settleability in the oxidation ditch process

Cited by 18 publications

References 6 publications

Tuning Biological Nutrient Removal Plants

Tuning Biological Nutrient Removal Plants

Modeling and simulation of a carrousel for long-term operation

Study on Propellers Distribution and Flow Field in the Oxidation Ditch Based on Two-Phase CFD Model

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