Organic Materials Management

Conversion and Biomass to Energy

Many people know that organic materials--also known as biomass--can be used to produce compost and mulch. But organic materials can also be used to produce electricity (bioenergy), fuel (biofuel), and other industrial products. Examples of organic materials feedstocks include yard, tree, and brush trimmings; construction leftovers such as sawdust and wood debris; agricultural residues like corn stalks, rice and wheat straw; used vegetable oils; and paper.

Each year California generates more than 20 million tons of organic materials, of which about 6 million to 8 million tons are composted and mulched. Out of this, about 1.5 million tons are used as feedstock for the traditional biomass-to-energy industry. But what about the almost 15 million tons of organic material now landfilled each year?

A Vision for the Future

Imagine millions of tons of yard trimmings and wood that cannot be composted, and low-value paper residuals from material recovery facilities for which there is no recycling market demand. Today, all of these materials are sent to landfills at great cost to the environment. In the future, more materials such as agricultural residues that can no longer be burned in the fields may also end up in our landfills.

What if there was a way to convert these unwanted materials into high-value products such as energy, alternative fuels, and other industrial products? New conversion technologies such as hydrolysis, gasification, and anaerobic digestion have the potential to help solve some of these vexing environmental problems. These technologies differ from incineration and traditional biomass-to-energy approaches in that they do not involve combustion. The California Integrated Waste Management Board (CIWMB) is exploring a new vision for the future that could involve these conversion technologies to convert organic materials into energy, ethanol, solvents, and other products, The CIWMB and others have held major conversion technology forums dealing with these technologies and more.