Skip to main content

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

Buy Article:

$17.50 plus tax (Refund Policy)

Abstract:

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

DOI: http://dx.doi.org/10.2175/193864710798193545

Publication date: January 1, 2010

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • ingentaconnect is not responsible for the content or availability of external websites
wef/wefproc/2010/00002010/00000011/art00046
dcterms_title,dcterms_description,pub_keyword
6
5
20
40
5

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more