To manage the sludge that is generated from wastewater treatment units, Dayton & Knight incorporates digestion technologies like ATAD (Autothermal Thermophilic Aerobic Digestion) and Thermophilic Anaerobic Digestion.  
 

ATAD is a multi-stage high temperature biological process, which uses air and mixing energy to promote the breakdown of organics. Click here to find out more about ATAD

Dayton & Knight  Ltd. provides Feasibility studies, Pilot and Full-scale research, Pre-design, Process design and Commissioning assistance.  We have the most experience in designing ATAD systems in North America.

ATAD design benefits through Dayton & Knight Ltd.:

• More than 10 years experience in successful ATAD design throughout North America;

• Research at laboratory and three full-scale pilot facilities;

• Knowledge of multiple processes for your site specific needs;

• Retrofit and new facility designs;

• Computer augmented design and heat balance evaluations;

• Full-scale operational assistance.

Dewaterability of Thermophilically Digested Biosolids 

The research effort studies if operating conditions such as feed sludge composition, digestion temperature, and sludge retention time can be optimised for improved dewaterability of thermophilically digested biosolids. 

This project also searches for factors that have the most significant impact on dewatering properties, and explores mechanisms of solid-liquid separation in relation to dewatering.  Laboratory-scale, aerobic bioreactors of thermophilic and mesophilic digestion were operated and various digestion temperatures were tested. 

This study indicated that digestion temperature, rather than duration, appeared to be a more important factor affecting dewaterability.  Current efforts are directed towards identifying more effective means of improving dewaterability of thermophilic biosolids. It is envisioned that valuable information will be obtained from this research to assist in planning and operating more cost-effective, thermophilic sludge digestion as part of secondary waste treatment processes.

For more information about this study, please contact:

Mr. Harlan Kelly, P.Eng, P.E., hkelly@dayton-knight.com

or Mr. Jianpeng (Jim) Zhou, P.Eng., jpzhou@civil.ubc.ca

 

For more information on our bio-solids management services, please visit our Projects page or contact 

Harlan Kelly P.Eng.(hkelly@dayton-knight.com)

 

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