A case study of a full-scale food waste digester failure and recovery was presented at the Value of Biogas West Conference in Vancouver. This case study demonstrates the need for balance in anaerobic digester feedstock as too much of the coveted FOG can be problematic.
This guideline on anaerobic digestion (AD) has been prepared using the expertise and experience of members of the Canadian Biogas Association (CBA). Azura was pleased to be able to provide technical contribution, overall review, and editing by David Ellis, utilizing his almost 30 years of experience working with anaerobic digestion systems.
An food waste digester case study from Azura Associates was incorporated into the training material presented by anaerobic digester experts Dr. Melanie Hecht and Birgit Pfeifer at the IBBK’s virtual Biogas Operator Training in June of 2020. Dr. Hecht, who is a Senior Biogas Plant Biology and Process Control Expert, presented a section called “Practical Plant Operation: Process Control and Plant Optimization” at this event. This case study highlighted the methodology used by Azura to recognize imbalances and proactively adjust the digester feedstock recipe to balance its nutrition for optimal biogas production, performance, and consistency.
Azura’s experience with food waste anaerobic co-digestion (AnCoD) and our work at energy producing biogas plants was the basis for one of two podium presentations scheduled for the 2020 WEAO conference. Due to the COVID-19 pandemic, the in-person conference and presentations were cancelled, luckily the papers were still published.
The third Getting to Net Zero Energy event was hosted by the Ontario Water Consortium in February of 2020. This event continued the momentum toward getting five municipal wastewater treatment facilities converted to net zero energy by focusing on anaerobic codigestion to produce biogas. The biogas produced through anaerobic digestion of comingled food waste, organic waste, and sewage biosolids can be used to produced renewable electricity, or purified to produce renewable natural gas (RNG).
Azura’s David Ellis presented a case study of helping a farm-based digester as a part of Dr. Daniel Zitomer’s anaerobic digestion online short course. The case study focused on the importance of testing and knowing what additional data to look for in digestor remediation. The study also shares some empirical guideline values for LCFA concentrations in digester as determined by years of LCFA testing done by Azura.
Azura had 2 presentations accepted by WEAO and was schedule to be presented at the 2020 WEAO conference. Due to the COVID-19 pandemic, the in-person conference and presentations were cancelled, but the papers were able to be published online. One of the presentations explored the possibility of establishing an advanced digester monitoring tool that could predict if the digester was susceptible to imminent failures or crashes.
Lessons learned from three years of working with full-scale anaerobic codigestion facilities were compiled and shared by Azura’s Dodge Yu and David Ellis at this year’s virtual WEFTEC 2020 conference. Dodge gave the presentation which summarized the observations, data gathered, and lessons learned during Azura’s years of working with farm-based anaerobic digesters in Ontario, Canada. The presentation covers feedstock handling, digester monitoring parameters, as well as digestate end product management.
Following the third Getting to Net Zero Energy Wastewater workshop in February 2020, hosted by the Ontario Water Consortium (OWC), in partnership with the Ontario Clean Water Agency (OCWA), a team of industry professionals prepared a Handbook for Codigestion Projects at Municipal Wastewater Treatment Facilities.