Evaluating Digestion Compliance Calculations

$17.50 plus tax (Refund Policy)

Buy Article:


The Orange County Sanitation District (OCSD) operates and maintains two wastewater treatment facilities. Both plants treat an average of 200,000 cuft/day of primary and secondary sludge through the digestion process. An average of 650 tons of biosolids is hauled daily to reuse options. Both plants operate a combined total of 25 digesters and 5 holding digesters. As part of the Districts Biosolids Environmental Management System (EMS) an objective was initiated to evaluate the existing compliance calculations and monitoring data for quality assurance.

As part of that review, OCSD compared the use of the Van Kleeck and mass balance method to calculate the volatile solids destruction (VSR) then tracked the results for more than two years. The two methods produced results that differed 5–10% for some digesters. In addition, changes in primary treatment ferric chloride addition were monitored to demonstrate the impact on the VSR. Digester working volumes were changed to reflect improved grit accumulation estimates and to expand digester cleaning maintenance cycles increasing digester capacities.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864707787975976

Publication date: January 1, 2007

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 These proceedings are not peer reviewed.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