Greenwaste Compost Site Emissions Reduction from Solar-powered Aeration and Biofilter Layer
Announcement From CalRecycle
A team organized by the Association of Compost Producers, which included participants from CalRecycle, the City of Bakersfield, Harvest Power, compost emissions consultants Chuck Schmidt and Tom Card, and Peter Moon from O2 Compost, received funding from the San Joaquin Valley Unified Air Pollution Control District to conduct a research project that involved building and emissions testing a prototype commercial-scale, photovoltaic-powered Aerated Static Pile (ASP) compost system.
Three piles were built abutting each other to create an extended design collectively known as an eASP. Each eASP zone was placed on a foundation of aeration pipes and coarse-ground woody material, and was capped with a 1-foot-thick layer of finished, unscreened compost acting as a biofilter. The eASP was built using electric conveyors in place of diesel equipment, and was aerated using power provided by an on-site photovoltaic array. The prototype eASP and conventional windrows of the same age and feedstock were maintained for one month, during which time emissions of VOCs, ammonia and greenhouse gases were sampled using flux chambers.
This low-cost composting system showed VOC reductions of nearly 99% over the 22-day active composting phase compared to the control windrows, as well as ammonia reductions of around 93% and greenhouse gas reductions in the 70% range. There were significant additional benefits in terms of diesel use, process water use and facility land-use considerations.
You can find the report here, scroll down to the bottom of the page: http://www.valleyair.org/grant_programs/TAP/tap_idx.htm