Skip to main content

DYNAMICS WITHIN A YARD-WASTE COMPOST BIOFILTER DURING AMMONIA BIOTRANSFORMATION

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

Laboratory-scale biofilters were made with oven-dried compost and inoculated with: 1) a wastewater activated sludge (WW); 2) a diluted wastewater treatment plant nitrifying seed culture, NitroBac 100G (NB); or, 3) mixed with distilled, deionized H2O. The biofilters were fed an air stream with NH3 gas at between 15 to 130 ppm concentration. Observing concentrations of total ammoniacal nitrogen (TAN), nitrate (NO3 ) and pH, indicate that dissolved and adsorbed TAN did not always reach equilibrium with the gas phase suggesting that the microbial activity was capable TAN removal faster than the loading rate.

Constants for a Michaelis-Menten kinetic model were determined using inlet and outlet gas measurements. For inoculated biofilters, KS=100 mg N/ kg dry compost and Rmax=679 mg N/ kg dry compost-day while the uninoculated compost showed constants of KS=48 mg N/ kg dry compost and Rmax=415 mg N/ kg dry compost-day.

As NO3 ions increased, the measured compost pH was observed to decrease. This decrease was correlated with increasing NO3 concentration resulting from the nitrification process. With the use of a titration curve and a factor needed to correct for other reactions which may be occurring, the pH changes were modeled.

Liquid media tests were used to assess relative nitrification and TAN degradation reaction rates when inoculated with biofilter material. Generally, TAN degradation rates within liquid media decreased slightly when the biofilter was exposed to NH3 gas. On the other hand, NO3 production rates increased suggesting that the microbial nitrifying population was increasing.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864702785140375

Publication date: 2002-01-01

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 These proceedings are not peer reviewed.

    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
  • 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