| 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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“…During the 2010 growing season our compost out-performed manure in a side by side field trial by 60 bushels per acre! These results are largely a result of our high quality turner and the patient, helpful, and knowledgeable support from the Midwest Biosystems Team. We are looking forward to many more years working with Midwest Biosystems.”
Caleb Spear
“We wanted a turner that was a production machine. . . a turner that would get the carbon dioxide out of the windrow while keeping the product oxygenated. . . the drum design handles the compost gently and allows us to build crumb structure . . . . An important feature of the Aeromaster that keeps costs down is its ability to inject the water by the operator in one operation. This machine incorporates water so each particle is well coated — not wasting water. The watering capability has reduced our labor cost by half, while making our operation much more efficient.”
Mark Grover, Grover Landscape Services
Modesto, California“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
