SUEZ Class A Biological Hydrolysis
Class A Biological Hydrolysis is a retrofittable technology, ahead of conventional mesophilic digestion, which provides a platform to create an environment to enhance the rate-limiting step of anaerobic digestion, namely hydrolysis. Utilizing a six-tank set of reactors, a “6-pack”, Class A Biological Hydrolysis is configured to create a simulated plug flow to enhance digestion kinetics. Furthermore, having the versatility of a six reactor design, temperature and residence time can be tailored to not only enhance natural digestion rates, but also to treat wastewater sludge and primary solids to a time and temperature that meets Class A requirements outlined by the U.S. EPA’s CFR Part 503 rule.
What are the benefits to implementing your technology?
By implementing Class A Biological Hydrolysis, wastewater treatment plant owners and operators will produce Class A biosolids, and increase the effective existing digester capacity by three times. This enhancement allows plant owners to plan for capacity expansions or the importing of other organic wastes to substantially increase biogas production. With this substantial biogas increase, achieving energy neutrality is plausible.
For plant owners looking to directly enhance biogas yields from existing sludge loading, adding Class A Biological Hydrolysis can increase yields by more than 30% compared to conventional mesophilic digestion, while producing Class A biosolids.
Has the technology been tested, demonstrated, or implemented anywhere to date?
While there are 12 installations of earlier generations of Biological Hydrolysis globally, the Class A Biological Hydrolysis has not been built at full scale. To prove the capabilities of the technology however, Suez Water Technologies and Solutions invested in a demonstration pilot which has been running since early 2017 at the Southern Ontario Water Consortium testing centre in Guelph, Ontario, Canada. With more than a year of operation side by side with the existing conventional mesophilic AD at the Guelph facility, the Class A Biological Hydrolysis system has shown an improvement of volatile solids reduction and resultant biogas yield of over 30% compared to the full-scale plant. This performance is maintained at Biological Hydrolysis operating conditions, which generate Class A biosolids. During the demonstration, continuous monitoring of resultant biosolids has been performed, confirming compliance to Class A.
What are some of the next steps needed to advance the technology?
Suez Water Technologies and Solutions are in active negotiations with several municipalities to implement Class A Biological Hydrolysis at existing facilities. Both the connections and information exchange on the LIFT technology scan, as well as having a performance demonstration scale pilot have resulted in these opportunities to implement Class A Biological Hydrolysis at full scale.
LIFT has provided SUEZ with a platform to bring awareness to end users of the viable Biological Hydrolysis technology to enhance existing anaerobic digestion infrastructure and to produce Class A biosolids. To date, several connections with direct end users have been made. We look forward to several other opportunities through LIFT to promote the technology and continue to connect to end users.Michael Theodoulou, P. Eng.Senior Product Manager – Anaerobic Digestion SystemsSuez