| Criterion: | Aerated Static Piles: |
ACS Composting: |
| Mixing & Blending |
Thorough mixing and blending of materials does not occur. | Thorough mixing and blending occurs enabling interaction of carbon and nitrogen atoms. |
| Aeration | Airflow can form channels leaving anaerobic areas. | All materials turned have access to oxygen while passing over drum. |
| Temperature Control |
If positive pressure is used to vent heat, it may be difficult to meet temp requirements near the pipes. |
All materials in row have access to required thermophilic cycle for pathogen and weed seed destruction. |
| Watering | Added to windrow perimeter. Not consistent throughout. | Each particle is watered for equal moisturization throughout the row. |
| Odors | Biofilters are frequently utilized to manage odors. | Odors in windrows should disappear after 2-3 days. |
| Compost Quality |
Typically defines quality in terms of the absence of pathogens. | Defines quality in terms of what it does for the soil and plant. Complete laboratory comparisons are encouraged. |
| Profitability | Such facilities are often government operated, as private entities have difficulty profiting. Compost is often given away. Income is driven by tipping fees. |
Compost is often sold at from two to four times the cost per ton to produce. Income from compost sales can be a significant profit stream because of the product quality. |
| Startup & Annual Costs |
Capital costs for an enclosed facility processing approximately 5,000 tonsper year of wood and yard waste is approximately 2 million to 5 million dollars. Capital costs, not including land, will be decreased by building costs ($75 sq. ft.) in an open facility. Annual operating costs range from $10 to $70 per ton. Aeration pipes may require disposal or recycling.* | Capital costs for an enclosed facility with similar tonnage would be in the $400,000 range. Open air facility would be significantly less. |
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Testimonials
“I would like to tell you how pleased we are with the Aeromaster PT-120, PTO driven compost turner . . . . All these problems have been overcome since the purchase of a PT-120. We have also been very satisfied with your technical and parts assistance on the machine.”
Bart Sexton, Oneida County Solid Waste Administrator
Rhinelander, Wisconsin“Glendale’s property owners were also impressed with Midwest Bio-Systems’ scientific approach . . . . MBS could quickly monitor compost at all stages of incubation.”
Mike Hoyte, City of Glendale
Glendale, Arizona“The Midwest Bio-Systems windrow turner has been maintenance free for more than three years. Customer and technical support from Midwest Bio-Systems has been excellent and timely.”
Julie Smith, Putnamville Institution
Greencastle, Indiana

