Brown and Caldwell Home Page

Brown and Caldwell engineers and scientists are technical and thought leaders in the environmental sector. Meet the people who have been advancing innovation for more than 70 years.
Author      Title/Abstract      

Quantification of Dentrification Potential in Carbonaceous Trickling Filters
Author: Sidney Biesterfeld, Greg Farmer, Linda Figueroa, Denny Parker, Phil Russell
Date: 9/202
Presented at WEFTEC '02, The Water Environment Federation 75th Annual Technical Exhibition and Conference

Biofilm samples from a carbonaceous trickling filter were evaluated in bench scale reactors to determine their maximum potential dentrification rates. The samples were collected as intact, undisturbed biofilms by inserting clean microscope slides into the trickling filter at various locations, leaving them in place for 28 days, and then removing them and bringing them back to the laboratory. In the laboratory, they were placed into 0.6 L bench-scale reactors filled with sterilized, primary clarifier effluent that had been spiked with nitrate to a final concentration of 16-18 mg/L as N. Dissolved oxygen (D.O.) concentrations were maintained between 2 and 4 mg/L in the bulk aqueous phase to simulate conditions within the full-scale system. Nitrate loss from the reactors was monitored over a five hour period. Denitrification rates of 3.09 to 5.55 g-N/m2.d) either between (a) experimental runs or (b) sampling locaitons over the TF. This suggests that denitrification potentials are uniform over the entire volume of the full-scale TF. For wastewater treatment plants with TFs that currently nitrify downstream, recycle flows may be used to remove nitrate in their existing upstream TFs that currently nitrify downstream, recycle flows may be used to remove nitrate in their existing upstream TFs. This approach may be used to meet less stringent permitted discharge concentrations and may allow some facilities to postpone or eliminate construction of additional unit processes for denitrification.

This library contains published materials for which copyrights may be owned by entities other than Brown and Caldwell, but which are stored for limited uses by BC employees. Technical papers authored by BC employees generally may be printed and shared electronically with clients and prospective clients outside BC. Technical papers cannot be sold, and technical papers shared outside BC must have proper attribution of the original sponsoring organization or conference where the paper was presented. This attribution is embedded in each technical paper file when it is loaded into this library. Published articles from magazines or trade journals which are stored in this library are FOR INTERNAL USE ONLY and SHOULD NOT be distributed to clients or others outside BC, without express permission of the copyright owner. For questions regarding copyrights associated with any document in this library, or questions regarding copyrights in general, contact the Legal Department.