Here’s an Asian method called Bokashi. This composting system needs temps above 60ºF to work well but is a great solution, even for apartment dwellers because there is little to no smell. Bokashi composting
In aerobic composting, oxygen is used to accelerate the decay of organic material into compost. When free of contaminants, it is an excellent soil fertilizer as it increases its humus content. The process involves collection of feedstock, grinding of large woody material into smaller chips, and processing on concrete pads that trap any water runoff. Microbes break down the organic material. They thrive in an environment of 55% moisture, a 30:1 carbon to nitrogen ratio and with good airflow. The incoming feedstock is blended to create the ideal C to N ratio. The compost piles are monitored for temperature, moisture, oxygen and porosity to maintain optimum conditions. The compost will cook at 140-170°F for a pathogen reduction phase during which it is turned to aerate and ensure even heating. This is known as the pathogen reduction phase. It helps kill weed seeds and destroys fertilizers found in lawn grass. After this phase the compost goes through aeration and curing phases. The final product is screened before being ready for market. Aerobic composting can be done in either an open or closed system.
Closed or in-vessel composting is done in a closed environment. This can be a rotary drum or a large stainless steel lined container. The advantages of in-vessel composting are tighter control of temperature, odors, rodent control and the ability to compost meat and dairy products. Typically closed composters create compost quicker than open static piles.
Compost facilities can be large or small and there are different methods used for composting depending on the size of the facility and requirements. Cedar Grove is an example of a very large composter, but in WA state and around the country there are also community composting sites that are much smaller scale. An example would be at Midnight’s Farm on Lopez Island. https://www.midnightsfarm.com/compost
large reduction of waste stream going off island
organics, soil, and water remain on island
most organic and paper waste is compostable
compost is an excellent soil amendment
it is a fairly low tech process
reduced groundwater contamination by farm manure piles
reduced Puget Sound water contamination by clean green groundwater piles
contamination by persistent pesticides
vermin and odor control if waste food or manures are added
physical ailments from unprotected contact
Here’s a short video from the Cedar Grove Composting website. This is where your yard and food waste goes to for conversion into compost.
Fall is a great time to start composting. Ideally, our tree leaves, grass clippings, and even food waste can all be turned into beneficial compost for our yards and gardens. Sounds easy, right? – but what are the various methods and how do you start? Zero Waste Vashon has created a video series featuring Island […]
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