Can You Use a Worm Bin with Humanure Composting?

Choosing the Right Worm Bin

When using a worm bin for humanure composting, select a bin with adequate aeration, moisture control, and temperature regulation. A minimum bin size of 2x4x4 feet (24 inches deep) is recommended to allow for adequate decomposition and pathogen reduction. The worm bin should also have a secure lid to prevent pests and odors from escaping.

Managing the Composting Process

To safely compost humanure in a worm bin, the carbon-to-nitrogen ratio must be maintained between 20:1 and 40:1. This can be achieved by adding carbon-rich materials like coconut coir, shredded newspaper, or cardboard to the bin. The worm bin should also be maintained at a temperature of 131°F (55°C) for at least 30 days to kill pathogens. Worms should be added at a rate of 1 pound of worms per 1 cubic foot of bin volume.

Additional Considerations

Humanure composting can be a high-risk process if not managed correctly. It’s essential to include a 6-inch layer of finished compost on top of the humanure to act as a buffer and prevent pathogens from escaping. Regular monitoring of temperature, moisture, and carbon-to-nitrogen ratio is crucial to ensure safe composting. Additionally, local regulations and health codes should be consulted before starting a humanure composting program.