If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email help@ingentaconnect.com

Automated Primary and Secondary Solids Control Using Solids Density Meters

$17.50 plus tax (Refund Policy)

Buy Article:


The Lincoln Wastewater System is currently using Toshiba Solids Density Meters for two applications within the Theresa Street Wastewater Treatment Facilities. The first application involves using the instrument to control the operation of pumps withdrawing solids from the primary clarifiers to provide a consistent, well thickened primary sludge. By controlling the density of the sludge, the amount of sludge pumped to the anaerobic digesters is reduced with a resulting increase in digester capacity. The main advantages of using this type of automated primary sludge control, to produce thicker and more consistent solids concentrations, are longer detention times in the digesters with increased digester capacity and reduced operator requirements.

The second application includes using the solids density meter in conjunction with magnetic flow meters to automatically control the solids retention time of the mixed liquor in the activated sludge process. The implementation of the system has provided more uniform control of the solids inventory within the process, with fewer wide swings in sludge age. However, the biggest advantage of the control system has been the reduction in effort to take samples, conduct lab analysis, perform the necessary calculations, and set pump intervals and durations. The activated sludge process and wasting efforts have become essentially hands-free.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864708788733413

Publication date: January 1, 2008

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 These proceedings are not peer reviewed.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



Share Content

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
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