An “Inconvenient Truth” about Composting
Composting is a really green thing to do, right? I’ve always thought so since my Grandfather taught me to do it in the early sixties. Large-scale composting is getting to be quite the rage. The City of San Francisco attracted a great deal of attention with it’s mandatory food scrap recycling program and lots of local wineries are bragging about their use of that compost to fertilize their vineyards.
I just read today about how the Langley Parish Council in England is setting up a village compost and “set an example to small villages as the UK strives to battle climate change.” Unfortunately, I recently learned that they and San Francisco and the Napa wineries might actually be doing is contributing to climate change.
Climate change science often ends up challenging things we think we know.
Inconvenience
The idea of composting is to provide plenty of moisture and oxygen so that microbes will digest the easily available organic matter and generate a great deal of metabolic heat in the process. What is left at the end is a sterilized source of more resistant organic matter that can enrich a soil.
of wastes is done with very good intentions, but there is the inconvenient truth that even a very well run large-scale compost operation emits some methane.
But if you stop to think about it, as much as you intend to have oxygen available to the whole pile (aerobic conditions), there are definitely going to be micro-sites that are going to lack oxygen (anaerobic conditions) particularly when there is huge oxygen demand during the peak of the process. That is where methane gets made.
