Skip to main content

Evaluation of Two Dual Digestion Processes: Autothermal Thermophilic Aerobic Pretreatment Followed by TPAD Versus MAD

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

Two dual digestion (DD) processes: autothermal thermophilic anaerobic digestion (ATAD) followed by temperature-phased anaerobic digestion (TPAD) and ATAD followed by mesophilic anaerobic digestion (MAD), are evaluated for digestion of thickened combined municipal solids in terms of volatile solids (VS) destruction, and biogas production. Conventional MAD and ATAD-MAD processes achieved better performance with shorter hydraulic retention time (HRT) of 10d when compared to ATAD-TPAD process with 14d HRT for high organic loading rates (OLRs) (up to 6.75 gVS/L/d). On the other hand when OLR reduced to 3.38 gVS/L/d, ATAD-TPAD system was the most efficient process among the processes compared. The ‘apparent’ inhibition for high OLRs was attributed to substrate availability (unionized acetic acid levels) and inhibition in the TPAD 55°C reactor (1.35 and 3.10 mmol/L for OLRs of 5.06 and 6.75 gVS/L/d, respectively) since unionized acetic acid is substrate as well as inhibitor for methanogenesis.

Keywords: ATAD; TPAD; dual digestion; organic loading rate; unionized acetic acid

Document Type: Research Article

DOI: https://doi.org/10.2175/193864709793954952

Publication date: 2009-01-01

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 These proceedings are not peer reviewed.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