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      


Evaluation of Biosolids Utilization Options for the Capital Regional District, Victoria, BC
Author: Steve Wilson, Dana Devin-Clarke, Tony Brcic
Date: 6/311
Preprint, WEF/AWWA Joint Residuals and Biosolids Management Conference 2011 May 22-25, 2011, Sacramento, CA

The Capital Regional District (CRD) in Victoria, BC, evaluated biosolids utilization alternatives as part of a planning effort for the Core Area Wastewater Treatment Program (CAWTP). A two-stage analysis was conducted to identify a biosolids management program that met the CRD’s goal of cost-effective, environmentally sustainable, and socially responsible wastewater treatment. If managed appropriately, biosolids production and utilization could provide multiple benefits to the utility including reduction of its carbon footprint, revenue from the biosolids product, and additional resource recovery. Analysis revealed the most beneficial utilization options were those that promoted solids stabilization through anaerobic digestion. Resource recovery was maximized through capture of biogas for sale to the local utility, reuse of heat energy for thermal drying, and production of a Class A biosolids product. Final recommendations indicated a diverse array of biosolids management options that would maximize CRD and provincial goals. Dried fuel product was determined to be particularly attractive, in part, because the carbon tax in British Columbia provided an economic incentive for industry. This market was the ultimate recommendation of the study. In addition, development of a topsoil blend and mine reclamation were recommended to diversify the biosolids program. Results of this analysis enabled CRD to make an informed decision about methods of production and biosolids utilization to maximize benefits. Regardless of the results of this analysis, the current plan is to produce a dried biosolids product that will be available as fuel for cement kiln or alternative energy production. Land-based biosolids recycling was not allowed in any form, even as a backup measure for the program. Details of the evaluation and further discussion of the decision-making process will be provided.

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.