In 2010 a group of students began to think about how to improve sustainability practices at Goshen College. Composting food discarded by students and food service activities was on their mind. A group including students, food service staff, college maintenance staff, faculty, and administration gathered to discuss some options. The outcome of the meeting was the beginnings of development of The Goshen College Composter, an inexpensive insulation lined plywood box that can contain about 2000 lbs of discarded food and mulch.
Goshen College is a liberal arts school associated with the Mennonite Church and is located in Goshen, Indiana.
Plant Manger: Tom McConnell –
The compost facility is near Kilmainhamtonwood in Ireland. This facility processes about 28000 tons per year of food waste from primarily Dublin area. They are hoping to expand to 40000 tons per year. Air vented from the facility is high in ammonia, and is scrubbed with sulfuric acid solution prior to being vented to a biofilter. The reaction forms ammonium sulfate which is sprayed onto the screened finished compost as a liquid fertilizer enriching the compost.
The composting process is accomplished in 22 bay enclosures 6 m ceiling height. The bays are enclosed, but not very effectively. Pathogen kill is accomplished by maintaining a temperature of 70C for at least 60 minutes. Compost is screened (trommel screen) to 12 mm prior to a secondary maturation stage at 80C.
Compost is spread at no cost on farmers fields with equipment owned by the compost facility. Staff also prepare a nutrient management plan for the farm.
Ardmore, OK, has been composting wastewater treatment biosolids now for several years based on the IPS agitated bin system, now provided by BDP Inc. Just this year and 100 miles north the City of Midwest City started up an agitated bed composting facility processing biosolids blended with shredded yard waste for marketing to local consumers. Both facilities receive yard waste from local clearing operations, landscaping, and power companies. Ardmore can handle up to 34 wet tons a day, and Midwest City about 17 wet tons per day.
IPS agitator and RotoMixer