Services - Biosolids Management

By: Dayton Knight  09-12-2011
Keywords: Wastewater Treatment

Services - Biosolids Management  

Opus DaytonKnight can be a valuable partner on your team for Biosolids Management Solutions.

To manage the sludge that is generated from wastewater treatment units, Opus DaytonKnight 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. 

Opus DaytonKnight 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  

Dayton & Knight and the University of British Columbia have been jointly sponsoring a research project that investigates dewatering aspects of ATAD 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.

Keywords: Wastewater Treatment

Other products and services from Dayton Knight


Services - Commissioning

Controls and instrumentation, so closely related to SCADA installations, receive an extensive loop checkout procedure that includes the final calibration of all related equipment. At the same time, our water or wastewater engineers verify the system, and provide the initial training to the operator on the operations and maintenance of the system.


Odour Control

Chemical addition (ferrous chloride, ferric chloride, hydrogen peroxide, potassium permanganate, sodium hypochlorite). Compost biofilters (for scrubbing wastewater treatment process offgases and sewage pumping station wet well offgases). Trickling filter media for use as a biological scrubber. Biological scrubber towers (nitrifying and/or caustic). Covering and venting of structures.



Where there are numerous existing services and/or where relatively deep excavation is required, trenchless construction can provide substantial cost savings. For more information on our capabilities and experience in trenchless technology or other consulting engineering requirements. Site safety is more effectively managed due to localized stationary worksite. Construction impacts are minimized when compared to open-cut construction.



We are especially proud of our efforts to assist our clients with public and regulatory liaison and consultation programs. To view information about some our past projects.