This in-vessel rotating drum composter is composting food waste, and interestingly enough, the amendment being used is horse manure. The operators of this facility know that in order to get good quality compost out, they need to put the right blend of feedstocks in. The constraints of the blend consists of: 1) a proper percentage of moisture and 2) the correct proportion of Carbon to Nitrogen. Because the food waste stream on its own did not meet these constraints, there needed to be an amendment added to the food waste. The horse manure was available and also needed to be disposed of, so this composting facility determined the right blend of these 2 waste streams, and are now indeed, producing very good compost. No less than a triple win!
Using negative ventilation, clean air is drawn into the vessel, and the exhausted air is captured in the duct work located at the discharge end of the BioReactor. The air is directed to a biofilter for filtration before being released to the atmosphere.
In another installation an Xact unit has been approved by a Hotel chain in Cancun, Mexico for their food waste. They have 2300 kg per day which will be process through a 2.4 x 9m bioreactor for 2 to 3 days then sent to the worm beds for final processing.
In Canada a municipality is proposing to install the Xact system to process shredded garden organics with the following requirements:-
• 300 to 500 tonnes of SSO per year.
• Waste will consist of green waste, brown waste (leaf and yard waste, wood chips)
• Density of SSO is 535 kg/cubic metre
• Retention period (in the BioReactor) of 7 days.
This would be done with a BioReactor - 3 metre diameter by 18 metres long. It has a capacity of 89 cubic metres (based on 70% of total capacity of the vessel) and will hold 49,220kg of waste. This size of BioReactor will handle 300 tonnes of SSO per year and would have no problem handling the anticipated 500 tonnes of SSO per year.
The retention time would vary as the volume changes. If in the future, if further expansion of the composting system is required, then another BioReactor would be added, the size of which is dependent upon the additional volume of waste
Large scale projects with 15 to 20 units or more, are easily and economically achieved with the Xact Bio-Reactors. Individual units at specified diameters and lengths are tailored to the conditions, with multiple units added as processing needs expand. The Xact system sits well with complete waste processing plants, requiring a low foot print for the capacity of organics processed.
1700 Cow Dairy Composts Dewatered Manure for Bedding
The XACT BioReactor on this dairy operation is 10’ diameter by 60’ long. It has to turn 45 to 50 tons of dewatered cow manure 240 times per day, 365 days per year. It had better be built strong!
After taking a look at the robust mechanical characteristics of the XACT BioReactor drum and the heavy duty drive system, this dairy operation was confident in the ability of the XACT system to handle the staggering weights of waste material to be processed daily.
Dewatered cow manure is fed into the vessel by a conveyor. Because the infeed opening is located in the upper left quadrant of the stationary infeed end, the BioReactor can be filled to 70% capacity. Remarkably, a 7.5 hp variable speed drive turns the BioReactor and its load. The gear and pinion provides smooth, steady and reliable rotation.
After a 4-day retention period in the vessel, the discharged compost is taken back to the barn to be used as bedding for the herd. Upon discharge the compost is pathogen free, weed seed free, insect larvae free, and odorless. At this point the compost is about 50% moisture, and therefore as it gets blown into the stalls there is minimal airborne dust. Most importantly, the cows love it as it provides exceptional comfort.
The bedding for the cows is compost made from the dairy manure