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      

Deriving More Information from Volatile Solids Data
Author: Christopher Muller, Derya Dursan, Rion Merlo, Steve Krugel, Alex Ekster,Bhavani Yerrapotu
Date: 6/311
Preprint, WEF/AWWA Joint Residuals and Biosolids Management Conference 2011 May 22-25, 2011, Sacramento, CA

This paper reports on how the calculation of volatile solid destruction (VSd) that may provide a relatively inexpensive and quick method of evaluating digester active volume and mixing efficiency. When a digester deviates from ideal or complete mix conditions the Van Kleeck method of VSd calculation under predicts solids destruction, while calculation using the mass balance approach over estimates VSd. Using the difference between the two calculated VSd measurements it is possible to identify the true VSd of the system using an iterative calculation method. Combining the results of the iterative analysis, developed in this study, with the commercial process simulator BioWin, it was possible to estimate the loss of active volume in the digesters at San Jose’s water reclamation plant, approximately 17.5 percent. The results of this study suggest that not only a relatively rapid an inexpensive method for active volume estimation could be developed but also provides insights into the interpretation of digester process data, and suggests that operators should calculate VSd using both methods.

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.