The Woodland Park Zoo used a static pile composting process that was turned with a small tractor. It served them well for years; however, it had reached its limitations in terms of area, time and labor to manage the increasing volume of herbivore manure. In addition to needing a system with more annual throughput, the zoo wanted to compost carnivore and primate wastes and needed a reliable method of meeting and recording temperature data for compliance with pathogen killing regulations. The zoo’s compost facility required an upgrade that included:
ECS, a Seattle based company, visited the zoo and worked with the zoo staff to design their new compost facility in an existing and irregular shaped area. The process design is a covered aerated static pile (CASP), with positive aeration, CompTrollerTM aeration design and monitoring, and a low friction trench (LFT) aeration floor. There are four (4) primary zones (~200 yd3 each) in a bunker wall configuration with a 26 day retention; and three secondary zones in a mass-bed configuration.
The resulting process upgrade decreases process time by 66% and increases process capacity by over 30%.
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