Skip to main content

FULL SCALE DEMONSTRATION AND ASSESSMENT OF ENZYMIC HYDROLYSIS PRE-TREATMENT FOR MESOPHILIC ANAEROBIC DIGESTION OF MUNICIPAL WASTEWATER TREATMENT SLUDGE

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

A full-scale monitoring programme was undertaken to assess acidogenic pre-treatment as a bolton biological upgrade to mesophilic anaerobic digestion (MAD). The United Utilities Enhanced Enzymic Hydrolysis (EEH) MAD pre-treatment process was installed by Monsal Limited at the Blackburn (UK) wastewater treatment plant. This process combines mesophilic acid phase digestion with pasteurization at 55°C using low grade boiler heat derived from biogas production. The monitoring programme started in January 2006 and ended in June 2007. The monitoring data will be utilized in a comprehensive evaluation of this pre-treatment technology. The purpose of this paper is to show process performance data of scientific significance based on selected monitoring results that are being evaluated as a first step in the larger technical and economic assessment. Enhanced Enzymic Hydrolysis (EEH) achieved 6 log E.coli removal and elimination of Salmonella. The pre-treatment provided a consistent feed to MAD with the anticipated outcome of more stable methane production. The upgrade has enhanced VS destruction by around 10% with concomitant improvements of 24% in biogas production. The potential for VS destruction and gas production are currently limited by low influent TS levels (5 %DS) and the need for optimization of the MAD mixing regime. VFA production during EEH at Blackburn is limited by hydrolysis kinetics and by inhibition when VFA levels are in excess of 9 g VFA-COD/L. The final biosolids product was of consistent quality with metal levels well below the norms established by the EU and EPA. Further research is required to better characterize factors limiting the potential for VFA production during EH and to understand how the EH acidogenic environment contributes to pathogen elimination.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Document Type: Research Article

Publication date: 01 January 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.

    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