Brown and Caldwell Home Page
Technical Papers RECENT PAPERS    ALL PAPERS

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      


A New Activated Sludge Process Control Test Uncovers Secondary Clarifier Inefficiencies
Author: Eric J. Wahlberg, Sidney Biesterfeld, David Farmer, David Kinnear, Leonard Robb
Date: 10/01
Presented at WEFTEC 2001, Oct. 2001, in Atlanta, GA.

A program was implemented at the Littleton/Englewood Wastewater Treatment Plant to monitor the flocculating, settling, and compacting characteristics of the TFSC sludge on a routine basis. These sludge quality characteristics were quantified in terms of the flocculated suspended solids (FSS) concentration, the 5-minute settled sludge volume, and the 30-minute settled sludge volume, respectively, performed in a single, modified settlometer test. The paper discusses the use of these sludge quality characteristics in making process control decisions. Comparison of the FSS and secondary effluent suspended solids (ESS) concentrations demonstrated why effluent quality (in this case, the ESS concentration) should not be used to make process control decisions. Changes in SRT caused changes in the settling and compacting characteristics, but additional, unknown factors are at play. The settling and compacting characteristics of the sludge did not affect the sludge’s flocculation potential. Low air temperatures worsened the hydraulic inefficiencies of the Littleton/Englewood secondary clarifiers.

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.