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High Rate Softener: To Enhance Softening Processes by Reactor Design and Process Parameters

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Generally, the physicochemical treatment of aqueous byproduct streams from industrial operations (softening, acid waste neutralization …) typically involves chemical precipitation of the contaminants via acid-base neutralization (or other means) followed by separation of the solids from the solution. The precipitation reaction, core of the chemical engineering in such processes, is a very unstable mechanism when poor homogenization and dispersion of the reagents are applied in the reactor. The consequences are:

Lower removal efficiency (hydraulic short-cut, long induction time)

Over-consumption of reagents (poor dispersion around the reagent input)

Scaling on walls and pipes / residual TSS in treated water (post precipitation)

Low density Sludge presenting a high moisture rate (nucleation >>> growth)

To solve such problems, advanced precipitation and crystallization processes have been developed that address the science of particle formation and growth to improve the recovered solids properties. Veolia has developed and tested some precipitation or softening unit. The mechanisms involved in these processes and their consequences on the treatment performances are presented in this study.

Keywords: Modeling; Precipitation; Reactor design; Softening process

Document Type: Research Article


Publication date: 2010-01-01

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