Composting at the pilot-scale facility was performed in 207-liter (55 gal) drums.
Feedstocks used were the actual MSW and the synthetic MSWs.
Aeration was done by temperature feedback (turned on when temperatures exceeded 60°C), as well as by a computer-controlled, timed aeration.
Material in the drums was turned and the moisture levels adjusted to approximately 50% every three days.
Samples were taken during the turning process and transported on ice to the University of Cincinnati for analysis.
Full-Scale Facility
At the Recomp facility, MSW was placed into rotary drums for mixing and then screening to 38 mm (1.5 inches).
The composting process was initiated by placing this screened material into Royer trenches, that were approximately
40 m long, 3.4 m wide, and 3 m deep.
Throughout the process, these trenches were aerated and cooled (to 65°C) from underneath with forced air.
Material was loaded into the front of a trench, mixed, and watered every three days.
Mixing was accomplished by an overhead apparatus that moved toward the front (loading) end of the trench while throwing the compost on a conveyor and dropping it 4 m behind.
In this manner, it took approximately 52 to 62 days for any one load to progress to the end of the trench.
The compost was then screened by ballistic separation to remove unwanted particles and placed on a curing pad in 4 m high windrows.
At the full-scale facility two different types of studies were conducted.
During the first study, three trenches were sampled at five different points;
these locations were chosen to represent five different time points in the MSW composting process.
The second, separate study consisted of following two MSW loadings throughout the composting process.
The first trench functioned as a control to the second trench, where 22.68 kg of nitrogen, in the form
of ammonium nitrate, was added (at the front end) to 12.7 tons of MSW.
During both studies, samples were taken by removing 2 liters of material from three equidistant positions across a 3.4-meter trench and at a depth of 1 m.
The three samples were mixed together and transported on ice to the University of Cincinnati for analysis.
A 408.24-kg subsample from the 27.21-metric ton run of the control, nitrogen amended, and unamended composts, was sent to the pilot- scale facility, upon exiting the trench, for monitoring of curing.
Composting at the pilot-scale facility was performed in 207-liter (55 gal) drums.
Feedstocks used were the actual MSW and the synthetic MSWs.
Aeration was done by temperature feedback (turned on when temperatures exceeded 60°C), as well as by a computer-controlled, timed aeration.
Material in the drums was turned and the moisture levels adjusted to approximately 50% every three days.
Samples were taken during the turning process and transported on ice to the University of Cincinnati for analysis.
Full-Scale Facility
At the Recomp facility, MSW was placed into rotary drums for mixing and then screening to 38 mm (1.5 inches).
The composting process was initiated by placing this screened material into Royer trenches, that were approximately
40 m long, 3.4 m wide, and 3 m deep.
Throughout the process, these trenches were aerated and cooled (to 65°C) from underneath with forced air.
Material was loaded into the front of a trench, mixed, and watered every three days.
Mixing was accomplished by an overhead apparatus that moved toward the front (loading) end of the trench while throwing the compost on a conveyor and dropping it 4 m behind.
In this manner, it took approximately 52 to 62 days for any one load to progress to the end of the trench.
The compost was then screened by ballistic separation to remove unwanted particles and placed on a curing pad in 4 m high windrows.
At the full-scale facility two different types of studies were conducted.
During the first study, three trenches were sampled at five different points;
these locations were chosen to represent five different time points in the MSW composting process.
The second, separate study consisted of following two MSW loadings throughout the composting process.
The first trench functioned as a control to the second trench, where 22.68 kg of nitrogen, in the form
of ammonium nitrate, was added (at the front end) to 12.7 tons of MSW.
During both studies, samples were taken by removing 2 liters of material from three equidistant positions across a 3.4-meter trench and at a depth of 1 m.
The three samples were mixed together and transported on ice to the University of Cincinnati for analysis.
A 408.24-kg subsample from the 27.21-metric ton run of the control, nitrogen amended, and unamended composts, was sent to the pilot- scale facility, upon exiting the trench, for monitoring of curing.
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