Sustainability Projects at CSU Maritime Academy

Coming Spring 2023: Biodigester

Bio-generated nutrients offered to our campus. Quads (facilities) will drive around a 200-gallon tank to transport the nutrients. It is a false rumor that carbon monoxide gas will be spread.


What is a biodigester?

One way for our campus to be more sustainable is by utilizing a biodigester. They are an excellent addition for businesses looking to be more environmentally friendly. Biodigesters are an effective way to reduce the carbon footprint of a business, easily manage food waste, and save money. It is a system that biologically digests organic material, either anaerobic (without oxygen ) or aerobically (with oxygen). Microbes and other bacteria break down organic materials in a biodigester. Most food, including fat, greases, and even animal manure, can be processed in a biodigester.


  1. What is the Project Scope?
    1. "Installation of a prefabricated bio energy system, horse microdigester, model AD25 and new concrete equipment pad and associated electrical work. Project to be completed no later than 11/15/2023."
  2. What is the particular vendor chosen?
    1. Impact Bioeneg, Inc's HORSE Microdigester, Model AD25
  3. What are the unique performance features of the product or brand you have specified that are not available from any other product? Be specific
    1. Quiet, near Lower Res Hall and The Marketplace
    2. Generator #1 operates at 1.6kW and is air cooled
    3. Generator #2 operates at 3.8kW and is air cooled
    4. Generator #3 operates a 6.0kW and is CHP, electric start
      1. The location is directly under a residential building and the generator features a drying bed that makes it quiet and a more safe (and enjoyable) environment for the cadet living above the unit.


Where will the biodigester be located?

The biodigester will be installed between Lower Residential Hall (LRH) and The Marketplace, specifically where the existing garbage disposal bins are.


Why did we invest in a biodigester?

Biodigesters are a closed system; therefore, it gives off no odor from food waste; this will eliminate flies and rodents from the facility, increasing hygiene. Also, eliminating food waste on-site saves money by reducing hauling costs. The capacity of food a biodigester can process depends on the size; larger the digester more food it can handle. Biodigesters are a living system and do require maintenance. However, they are easy to use and maintain.

Of course, one of the great benefits of biodigesters is they are eco-friendly and will reduce the dining center's carbon footprint significantly. Food scraps and other organic materials decaying in landfills release methane and carbon dioxide contributing to climate change. Food waste is estimated to be 30-40 percent in the United States and represents the largest category of materials in landfills. Diverting food scraps and other organic materials from landfills, methane, and carbon dioxide can be captured and used efficiently.

With the installation, the biodigester can be recreated to use methane gas and charge campus electric golf carts.