In Part 2 of our exploration of food waste management, author Peter Hildebrandt explores anaerobic digestion systems with configured to produce biogas for fuel.
On a Resort Island With Highly Seasonal Population
Nantucket Island, MA, composts food anaerobic waste in a digester, which is from Bedminster BioEnergy Technology. The anaerobic waste digestion system can be configured to produce either a bioenergy or compost material. In each case, the initial part of the process uses the patented Bedminster Digester to separate food waste into biodegradable and non-biodegradable fractions.
In Part 2 of our exploration of food waste management, author Peter Hildebrandt explores anaerobic digestion systems with configured to produce biogas for fuel.
On a Resort Island With Highly Seasonal Population
Nantucket Island, MA, composts food anaerobic waste in a digester, which is from Bedminster BioEnergy Technology. The anaerobic waste digestion system can be configured to produce either a bioenergy or compost material. In each case, the initial part of the process uses the patented Bedminster Digester to separate food waste into biodegradable and non-biodegradable fractions.
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Waste is received onto a tipping floor where any oversized items are removed before being transferred, unshredded, to the Bedminster Digester. The anaerobic digester can be sized to suit the material to be processed, but typically a digester drum with a capacity of 50,000 tons per annum would be 70 meters (230 feet) in length, 4.6 meters (15 feet) in diameter.
In two days, the anaerobic digester breaks down the biodegradable material by a combination of microbial and mechanical activity, to form a consistent biomass material less than 12 millimeters or 25 millimeters (1 inch) in size separated from the non-biodegradable fraction, which remains fundamentally whole. This is achieved by passing the output from the anaerobic digester over a trommel screen; in this case, the biodegradable fraction drops through the trommel and the unshredded material such as plastic bags, bottles, cans, and similar items pass over the screen.
The Overs are passed through magnetic and eddy current separators so that metals can be recovered for recycling, while the balance synthetic material, chiefly comprising plastic and non-biodegradable textiles, is baled and transported for further processing/recycling. The system’s composting process takes advantage of separation achieved in the anaerobic digester drum where 95% of the biomass in the delivered anaerobic waste is separated to achieve a homogenous product with low levels of contamination.
The now homogenized organic rich Unders are formed into windrows in an enclosed Maturation Hall. Material spends 21 days being aerated and consistently turned. Monitoring ensures that the material is turned at least three times at no less than two-day intervals attaining a minimum temperature of 140°F between turnings to ensure that the final compost is fully sanitized.
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To create a clean, energy-rich biogas, the biomass is indirectly heated in the Pyrolyser in an oxygen-depleted atmosphere. This prevents the formation of harmful compounds such as dioxins and furans associated with conventional combustion. The biogas is passed through a gas cleaning stage prior to being stored in gas storage tanks.
The biogas is fed to gas turbines or gas engines that power the electrical generators to produce renewable electrical energy. It is subjected to such high temperatures within the turbines/engines that any traces of dioxins and furans are completely destroyed. Exhaust heat produced by the turbines/engines is reused in a heat recovery steam turbine to increase the overall electrical conversion efficiency. This results in an available net electrical output power of approximately 1.0–2.0 MW per 40,000 tons per annum of MSW input (dependent on anaerobic waste input).
Waste is received onto a tipping floor where any oversized items are removed before being transferred, unshredded, to the Bedminster Digester. The anaerobic digester can be sized to suit the material to be processed, but typically a digester drum with a capacity of 50,000 tons per annum would be 70 meters (230 feet) in length, 4.6 meters (15 feet) in diameter.
In two days, the anaerobic digester breaks down the biodegradable material by a combination of microbial and mechanical activity, to form a consistent biomass material less than 12 millimeters or 25 millimeters (1 inch) in size separated from the non-biodegradable fraction, which remains fundamentally whole. This is achieved by passing the output from the anaerobic digester over a trommel screen; in this case, the biodegradable fraction drops through the trommel and the unshredded material such as plastic bags, bottles, cans, and similar items pass over the screen.
The Overs are passed through magnetic and eddy current separators so that metals can be recovered for recycling, while the balance synthetic material, chiefly comprising plastic and non-biodegradable textiles, is baled and transported for further processing/recycling. The system’s composting process takes advantage of separation achieved in the anaerobic digester drum where 95% of the biomass in the delivered anaerobic waste is separated to achieve a homogenous product with low levels of contamination.
The now homogenized organic rich Unders are formed into windrows in an enclosed Maturation Hall. Material spends 21 days being aerated and consistently turned. Monitoring ensures that the material is turned at least three times at no less than two-day intervals attaining a minimum temperature of 140°F between turnings to ensure that the final compost is fully sanitized.
In Part 2 of our exploration of food waste management, author Peter Hildebrandt explores anaerobic digestion systems with configured to produce biogas for fuel.
On a Resort Island With Highly Seasonal Population
Nantucket Island, MA, composts food anaerobic waste in a digester, which is from Bedminster BioEnergy Technology. The anaerobic waste digestion system can be configured to produce either a bioenergy or compost material. In each case, the initial part of the process uses the patented Bedminster Digester to separate food waste into biodegradable and non-biodegradable fractions.
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Waste is received onto a tipping floor where any oversized items are removed before being transferred, unshredded, to the Bedminster Digester. The anaerobic digester can be sized to suit the material to be processed, but typically a digester drum with a capacity of 50,000 tons per annum would be 70 meters (230 feet) in length, 4.6 meters (15 feet) in diameter.
In two days, the anaerobic digester breaks down the biodegradable material by a combination of microbial and mechanical activity, to form a consistent biomass material less than 12 millimeters or 25 millimeters (1 inch) in size separated from the non-biodegradable fraction, which remains fundamentally whole. This is achieved by passing the output from the anaerobic digester over a trommel screen; in this case, the biodegradable fraction drops through the trommel and the unshredded material such as plastic bags, bottles, cans, and similar items pass over the screen.
The Overs are passed through magnetic and eddy current separators so that metals can be recovered for recycling, while the balance synthetic material, chiefly comprising plastic and non-biodegradable textiles, is baled and transported for further processing/recycling. The system’s composting process takes advantage of separation achieved in the anaerobic digester drum where 95% of the biomass in the delivered anaerobic waste is separated to achieve a homogenous product with low levels of contamination.
The now homogenized organic rich Unders are formed into windrows in an enclosed Maturation Hall. Material spends 21 days being aerated and consistently turned. Monitoring ensures that the material is turned at least three times at no less than two-day intervals attaining a minimum temperature of 140°F between turnings to ensure that the final compost is fully sanitized.
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To create a clean, energy-rich biogas, the biomass is indirectly heated in the Pyrolyser in an oxygen-depleted atmosphere. This prevents the formation of harmful compounds such as dioxins and furans associated with conventional combustion. The biogas is passed through a gas cleaning stage prior to being stored in gas storage tanks.
The biogas is fed to gas turbines or gas engines that power the electrical generators to produce renewable electrical energy. It is subjected to such high temperatures within the turbines/engines that any traces of dioxins and furans are completely destroyed. Exhaust heat produced by the turbines/engines is reused in a heat recovery steam turbine to increase the overall electrical conversion efficiency. This results in an available net electrical output power of approximately 1.0–2.0 MW per 40,000 tons per annum of MSW input (dependent on anaerobic waste input).
To create a clean, energy-rich biogas, the biomass is indirectly heated in the Pyrolyser in an oxygen-depleted atmosphere. This prevents the formation of harmful compounds such as dioxins and furans associated with conventional combustion. The biogas is passed through a gas cleaning stage prior to being stored in gas storage tanks.
The biogas is fed to gas turbines or gas engines that power the electrical generators to produce renewable electrical energy. It is subjected to such high temperatures within the turbines/engines that any traces of dioxins and furans are completely destroyed. Exhaust heat produced by the turbines/engines is reused in a heat recovery steam turbine to increase the overall electrical conversion efficiency. This results in an available net electrical output power of approximately 1.0–2.0 MW per 40,000 tons per annum of MSW input (dependent on anaerobic waste input).
