Woodland Park Zoo // Seattle, WA

Woodland Park Zoo // Seattle, WA



    Client Needs:


    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:

      • A more compact facility footprint;
      • Faster processing;
      • Ability to process more diverse waste material;
      • Automated aeration and temperature control and monitoring; and
      • Reliable process and odor control.



    ECS Solution:

    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, CompTroller 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 (3) secondary zones in a mass-bed configuration.


    The resulting process upgrade decreases process time by 66% and increases process capacity by over 30%.



    Capacity (tpy)



    Herbivore and carnivore manure and bedding.

    ECS Technologies Employed

    Aerated Static Pile System

    CompTroller™ Automated Control & Monitoring System

    Suspended Floor Biofilter

    Negative Aerated System

    Start-Up Year



    Seattle, WA



    Read more about the Woodland Park Zoo's Facility in The Seattle Times.


    Visit the Woodland Park Zoo's website for more information.