Skip to main content

Comparison of Concurrent Pilot Scale and Full Scale Batch Operations to Demonstrate Disinfection

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial


The Neutralizer® process is a sludge disinfection process which has recently been granted National PFRP equivalency recommendation by the USEPA's Pathogen Equivalency Committee (PEC). During the course of preparing an application to the EPA for regulatory approval a substantial amount of process development and testing was conducted at lab scale, pilot scale and full scale.

During the later stages of development and testing, the need arose to add quantities of polioviruses and Ascaris suum, which are pathogenic microorganisms (pathogens), to the raw sludges. This was necessary to demonstrate reduction of viable Helminth ova and enteric virus. In order to avoid adding the pathogens to the full scale batch process tanks, a method was developed whereby matrix, untreated sludge, spikes were conducted at pilot scale only. The spiked pilot scale process was operated concurrent with and under identical conditions to the full scale batch process and the resulting reduction of indicator organisms and surrogate indicator organisms was compared between the two processes. Compliance with the pathogen reduction requirements of the PEC was established by demonstrating that the sludge in both the full scale and pilot scale process tanks was subjected to identical conditions, and that the reduction of both indicator and surrogate indicator organisms in both process tanks were the same.

Keywords: Class A; biosolids; disinfection; pathogens; sludge; surrogate indicators

Document Type: Research Article


Publication date: 2011-01-01

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 These proceedings are not peer reviewed.

    A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Learn about the many other WEF member benefits and join today
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect 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