If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email help@ingentaconnect.com

Effect of Iron Addition on Thermophilic-Mesophilic Anaerobic Digestion

$17.50 plus tax (Refund Policy)

Buy Article:

Abstract:

Under some conditions, thermophilic anaerobic digesters produce effluent with elevated volatile fatty acids concentration (i.e., ≥1500 mg/L). The acids can be problematic since they cause odor, represent residual substrate that has not been converted to methane, and can exert a significant BOD5 when conveyed to an aeration tank via filtrate/centrate from biosolids thickening/dewatering. Therefore, methods to reduce the acids concentration would be helpful. In the work described, the direct addition of ferric chloride to the thermophilic stage of a full-scale temperature-phased anaerobic digestion system correlated with a sharp drop in volatile fatty acids (VFA) concentrations in the digesting biosolids. Addition of a blend of metallic micronutrients, including iron, produced a similar drop in VFA level observed in the pre-design pilot study of the temperature-phased system. Several metals may provide a stimulatory effect to reduce acids concentration. Iron, in the form of ferric chloride also provides struvite deposition control and reduces hydrogen sulfide (H2S) in the digester gas. In this paper, the practical benefits of adding iron and other trace nutrients to TPAD systems is described. In addition, the work serves as an example of linking university laboratory studies and full-scale operations to improve biosolids processing.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864708788806601

Publication date: January 1, 2008

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 These proceedings are not peer reviewed.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

Tools

Favourites

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
X
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