Skip to main content

Evaluation of Equipment for the Screening of Digested Solids Prior to Centrifugation: A Case Study at the Joint Water Pollution Control Plant

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

In order to protect the dewatering centrifuges and to enhance the marketability of the dewatered biosolids, the digested solids stream is screened prior to centrifugation at the Joint Water Pollution Control Plant in Carson, California. This facility is owned and operated by the County Sanitation Districts of Los Angeles County. Five different screening machines were tested. Four were septage acceptance units and one was an in-line strainer. The candidate units would replace a set of nine rotary drum screens currently in use, as well as two screenings dewatering presses. The in-line strainer (complete with pneumatic back pressure control, screen and auger), as well as two septage acceptance units (complete with screens and augers only) were found to be acceptable for this application. The in-line strainer was more expensive, but could remove as much as 997 wet lb/Mgal (119 g/m3) coarse screenings at a higher total solids (TS) content (52.2%) than either of the acceptable septage receiving units, which could remove 661–782 wet lb/Mgal (79.1–93.6 g/m3) at 24–28% TS. The in-line strainer removed nearly twice as much material (by dry weight) as the current screens which remove 1,000 wet lb/Mgal (120 wet g/m3) at 24–25% TS. This report describes the operational testing program and the method of evaluation for the five machines which were tested.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864701784993029

Publication date: 2001-01-01

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 These proceedings are not peer reviewed.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
X
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