What are Most Common Myths Surrounding Humanure Composting?

Myth of Pathogen Risk

The myth that humanure composting poses a significant risk to human health due to pathogens is a common concern. However, when humanure is composted correctly, the risk of pathogen transmission is greatly reduced. Studies have shown that temperatures above 131°F (55°C) for a minimum of one hour can kill 99.99% of pathogens, including E. coli and Salmonella. To achieve this, it’s essential to maintain proper carbon-to-nitrogen ratios, oxygen levels, and moisture levels during the composting process.

Misconceptions About Odor and Fly Attraction

Another common misconception is that humanure composting is inherently smelly or attracts flies. This is often due to inadequate composting practices, such as insufficient carbon additions, poor moisture control, or inadequate aeration. By incorporating 2-3 parts of carbon-rich materials (like sawdust or wood chips) into the compost pile for every 1 part of humanure, odor and fly issues can be minimized. Regular turning and monitoring of the compost pile can also help maintain optimal conditions.

Reality of Pathogen Destruction and Nutrient Retention

Humanure composting, when done correctly, can be a safe and effective way to destroy pathogens and retain valuable nutrients. One study found that humanure composting can retain up to 80% of the original nitrogen content, making it a valuable resource for fertilizing plants. When humanure is composted at a temperature of 131°F (55°C) for a minimum of one hour, the risk of pathogen transmission is eliminated, and the resulting compost can be safely used in gardens and agricultural applications.