Skip to main content

Modification of a Conventional Anaerobic Digester for Improving the Effluent and Sludge Characteristics

Buy Article:

$22.00 plus tax (Refund Policy)

The aim of this study was to enrich the composition of anaerobic digester sludge in terms of nitrogen and phosphorus by struvite (MgNH4PO4) formation. Waste activated sludge was anaerobically digested in batch reactors under the conditions that the minimum stoichiometric requirement for struvite formation was satisfied in all reactors. For this purpose, different amounts of magnesium (Mg2+) and phosphate (PO4 3−) ions were added initially to the batch reactors. The results showed the effects of adding Mg2+ and PO4 3− ions on the performance of anaerobic digestion and on the amounts of ammonium (NH4 +) and PO4 3− ions released during digestion. The results indicated that the performance of the anaerobic digestion in chemical oxygen demand removal changed between −4.0% and 15.4% for a Mg2+ concentration range of 277.2 to 529.3 mg/L and a PO4 3− concentration range of 377.4 to 2372.4 mg/L. There was an increase in the concentration of NH4 + in all reactors during digestion, but the extent of concentration increase could be controlled by increasing the initial concentrations of Mg2+ and PO4 3−. The maximum removal of NH4 + ions (33.7%) was observed in the reactor dosed initially by Mg2+ and PO4 3− concentrations of 467.2 and 2123.3 mg/L, respectively. The concentration of PO4 3− ion was lower than its initial concentration in all reactors, indicating considerable fixation of PO4 3− as it was released, by struvite and other solid species formation. The decrease in the concentration of Mg2+ ions similar to PO4 3− was accepted as evidence for the formation of solid species composed of Mg2+ and PO4 3, in addition to struvite.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

Keywords: ammonia removal; anaerobic digestion; phosphate removal; struvite; waste activated sludge

Document Type: Research Article

Publication date: 2009-12-01

More about this publication?
  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
  • Editorial Board
  • Information for Authors
  • Submit a Paper
  • Subscribe to this Title
  • Membership Information
  • Information for Advertisers
  • WEF Bookstore
  • 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