The Role of Organic Polyelectrolytes in High Rate Alternatives to Primary Separation

Becker, Natana; Booker, N. A.; Davey, A.P.; Gray, Stephen; Jago, R.; Ritchie, C. B

doi:10.1007/978-3-642-59791-6_21

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…The effect of different cationic polyelectrolytes on floc strength has also been studied by Becker et al [5] and Gray and Ritchie [6]. Floc strength was expressed as a critical mixing speed (CMS), where flocs formed at low speed were subjected to increasingly higher shear rates.…”

Section: Introductionmentioning

confidence: 99%

“…The shear rate at which an abrupt rise in turbidity following settling occurred was termed the CMS, and therefore a high CMS was indicative of stronger floc strength. It was shown [5,6] that polyelectrolytes of a medium charge density (CD) and very high molecular weight (MW) were the optimum for the production of strong flocs. The residual polylelectrolyte left in solution [5] was an order of magnitude lower for the very high MW polyelectrolyte compared to the high MW polyelectrolyte for the CMS of interest in their high rate screening process.…”

Section: Introductionmentioning

confidence: 99%

“…It was shown [5,6] that polyelectrolytes of a medium charge density (CD) and very high molecular weight (MW) were the optimum for the production of strong flocs. The residual polylelectrolyte left in solution [5] was an order of magnitude lower for the very high MW polyelectrolyte compared to the high MW polyelectrolyte for the CMS of interest in their high rate screening process. This outcome is significant, as the residual polyelectrolyte dose is important when the treated water is to be discharged to natural environments or is to be recycled to processes that are polyelectrolyte sensitive.…”

Section: Introductionmentioning

confidence: 99%

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High floc strength with aged polyelectrolytes

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Colloids and Surfaces A: Physicochemical and Engineering Aspect

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The ageing of powdered polyelectrolyte solutions has shown that while the viscosity of these solutions decreases rapidly with time, the flocculation performance and the strength of the flocs produced does not alter over periods >200 days. This was shown for polyacrylamides of cationic, anionic and non-ionic charge. The use of tap or deionized water did not adversely affect the results unless a biocide capable of associating with the polyelectrolyte was added. These results contradict the common belief that solutions made with powdered polyelectrolytes should not be stored for long periods of time as their performance decreases after being stored for several days. The results indicate that powdered polyelectrolyte solutions are suitable for intermittent process operations, such as sewer overflow treatment and that dosing and handling of the solutions can be made easier by ageing of the solutions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High floc strength with aged polyelectrolytes

Gray

Becker

Booker

et al. 2007

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Organic polyelectrolytes in water treatment

2007

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Reducing the total discharge from a large WWTP by separate treatment of primary effluent overflow

Hanner¹,

Mattsson

Gruvberger³

et al. 2004

Water Science and Technology

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At many large wastewater treatment plants (WWTPs) the increased hydraulic load, caused by combined sewer systems during storm events, results in primary effluent overflow when the capacity of further treatment is exceeded. Due to stringent effluent standards, regulating the total discharge from the WWTPs, the Rya WWTP in Göteborg and the Sjölunda WWTP in Malmö will have to reduce the impact of primary effluent overflow. Separate, high rate, precipitation processes operated only during high flow conditions have been investigated in pilot units at the two WWTPs. Precipitation in existing primary settlers operated at a surface loading of 3.75 m/h removed phosphorus to 0.35 mg/l. The Actiflo process was also shown to remove suspended solids and phosphorus well. BOD was reduced by 50-60%. With such processes the overall effluent concentrations from the plants can be reduced significantly. Key upgrading features are small footprints, short start up time and high efficiency.

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The Role of Organic Polyelectrolytes in High Rate Alternatives to Primary Separation

Cited by 3 publications

References 10 publications

High floc strength with aged polyelectrolytes

High floc strength with aged polyelectrolytes

Organic polyelectrolytes in water treatment

Reducing the total discharge from a large WWTP by separate treatment of primary effluent overflow

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