Cold/High Anaerobic Digestion Community of Practice

Evaluating the potential to use poop pathogen reduction as an energy resource for remote cold/ high altitude communities. Can the energy balance for anaerobic digestion work?

Scope of Activities

logo graphic: a brown outhouse on green mountains with two large green leaves growing from its roof

The goal of the Cold/High Anaerobic Digestion Community of Practice is to develop anaerobic digestion systems that are deployable in Arctic, sub-Arctic, and high-altitude rural areas to address sanitation issues and potentially provide a source of renewable energy.

While anaerobic digestion has been used for hundreds of years to treat human and animal waste and generate methane as an energy source, research on the feasibility of implementing these systems in Arctic, sub-Arctic, and high elevation ecosystems is limited and largely anecdotal. This consortium formed therefore to collect and consolidate information on anaerobic digestion of waste for these communities. We are also working to determine the feasibility of the multi-benefit use of anaerobic digestion for energy generation, as the cost and logistics of diesel for home heating in remote communities is an economic burden for these communities and has been found to be a cause of elevated childhood asthma rates.

To bolster these efforts, this group is collaborating with the Global Methane Initiative (GMI) to initiate studies and anaerobic digestion pilots as part of GMI's international focus on reducing barriers to recovering methane as a clean energy source.

Poop is a resource. Let's use it!



Team Leaders

Embrey Bronstad
Brown and Caldwell

Margaret McCauley
U.S. Environmental Protection Agency (Website)


Deliverables from the Arctic Research Plan

1.3 Provide research and technical support for water and sanitation infrastructure.

  • 1.3.1 Synthesize and expand upon existing efforts to create data visualization maps of areas at high risk for coastal erosion, permafrost thaw, and flooding within specified future time periods (e.g., 10 years, 50 years, 100 years) to identify at-risk areas and inform investments in climate resilient infrastructure.
  • 1.3.2 Develop a publicly accessible database for information on drinking water contaminants (including PFAS) and effective treatment processes. The database will be of use to water treatment operators, regulatory agencies, researchers, and treatment process consultants and designers. It could also support responses to emergency contamination events.
  • 1.3.3 Support research on the feasibility of PFAS treatment for surface water and groundwater in the Arctic. This will help inform a strategy on PFAS remediation of contaminated sites.

3.1 Conduct and support research to foster the development of Arctic infrastructure. This includes research on improvements in community capacity and infrastructure projects that are prioritized by Arctic communities to support resilience and leverage technology in community redevelopment and relocation efforts.

  • 3.1.2 Support new innovations and off-the-shelf technology that can be implemented in community development plans to support the ability of Arctic communities to combat climate change impacts.

4.3 Research to support more resilient and transformative infrastructure to withstand potential impacts from acute and long-term hazards, including those hazards brought about by climate change.

  • 4.3.1 Conduct a study focused on expedient and enduring cold regions infrastructure, including water and wastewater, energy, and temporary and enduring structures. Results will be disseminated into a report that will identify and provide background information on the variety of available and emerging water/wastewater, energy, and structure technologies and best practices.

Accomplishments

Anaerobic digestion operators typically aim to maintain a constant warm temperature to keep their microbe populations steady. This is infeasible in small communities in extreme cold locations. A bench scale study found that freezing then thawing synthetic human feces resulted in a lag period but ultimately similar or even greater amounts of methane than baseline, unfrozen assays. These results combined with solar radiation data indicate that Alaska subarctic locations receive enough solar thermal energy in summer months to support seasonally operated, psychrophilic anaerobic digesters.