2928 POWERSPECTRUM

French pigs help produce l’électricité

The production of biogas from manure is an area of alternative energy that is of interest to many livestock producers. Similar to natural gas, methane captured by a biogas system can be substituted for conventional fossil fuels to provide heat, electrical power, or transportation biofuel and therefore reduce greenhouse gas emissions.

In-depth analysis of the costs of anaerobic digester systems on farms – compared to conventionally purchased electricity, natural gas, and liquid propane – shows that anaero-bic digester systems could produce energy for many livestock operations at a cost at

Agricultural biogas is produced from “waste” farm materials such as manure, slurry, silage, etc. The methane gas – a greenhouse gas 21 times more potent than CO2 – becomes the feedstock for small in-farm power plants. Properly treating the residues collected from the digestion process at FERTIGAZ, a French company, is a job for ANDRITZ centrifuges.

or below commercial natural gas prices. If excess energy in the form of electricity or heat is sold, the economics become even more attractive.

Most agricultural biogas projects are located on dairy farms, due to the high volume of waste available. But the French company FERTIGAZ now has two sites operating at commercial swine farms. FERTIGAZ develops plants for the treatment of biodegradable waste by anaerobic digestion. Its newest installation at Plouédern (Finistère) produces biogas from a mixture of sludges, grease, food scraps, and pig manure.

The Plouédern bio-methane plant, commis-sioned in 2011, produces electricity from a 400 kW co-generator fed by biogas produced in the waste digestion process. In addition to the gas, the digested material has a liquid fraction (sent to a treatment plant) and a solid fraction (composted and dried). Electricity is sold to the grid, and the heat is used to accelerate compost drying.

Pig manure is used to dilute the organic waste before it enters the digester. Due to its limited fuel value, surplus manure is biologically treated at the on-site water treatment plant.

Agricultural biogas extraction offers several benefits:

� Producing green and

renewable energy

� Reducing pollution and

greenhouse gases

� Reducing odors and pathogens

� Transforming waste into

valuable bio-fertilizer

In order for the process to function correctly, the digested product must be dewatered. For this operation, FERTIGAZ chose ANDRITZ centrifuge technology. Taking into consid-eration the fibers and abrasive materials in the digested product, ANDRITZ installed its D-series decanter.

The D3L centrifuge is sized to treat the four tons of dried matter daily. It has a cylindri-cal/conical rotor which allows the scroll to turn at a slightly higher rate than the bowl to ensure solids extraction. The scroll extends the holding time within the rotor (increasing dryness) while optimizing clarified liquid runoff to achieve the best capture rates.

Thanks to a clever “chain” system on the two motor inverters, energy produced by the generator is reused by the main motor. This reduces power consumption by as much as 25%.

With water conservation in mind, FERTIGAZ wanted a solution that achieved low con-sumption while obtaining dryness levels of 25% – with quality acceptable to the an-aerobic reactor. After dewatering, the solids are sent to compost. The liquid, loaded with dissolved pollutants, is sent to the on-site water treatment plant.

ANDRITZ decanters are employed to take the water out of digested materials so that the solids can be composted and dried. The extracted liquid is processed in an on-site water treatment plant.

2928 POWERSPECTRUM

French pigs help produce l’électricité

The production of biogas from manure is an area of alternative energy that is of interest to many livestock producers. Similar to natural gas, methane captured by a biogas system can be substituted for conventional fossil fuels to provide heat, electrical power, or transportation biofuel and therefore reduce greenhouse gas emissions.

In-depth analysis of the costs of anaerobic digester systems on farms – compared to conventionally purchased electricity, natural gas, and liquid propane – shows that anaero-bic digester systems could produce energy for many livestock operations at a cost at

Agricultural biogas is produced from “waste” farm materials such as manure, slurry, silage, etc. The methane gas – a greenhouse gas 21 times more potent than CO2 – becomes the feedstock for small in-farm power plants. Properly treating the residues collected from the digestion process at FERTIGAZ, a French company, is a job for ANDRITZ centrifuges.

or below commercial natural gas prices. If excess energy in the form of electricity or heat is sold, the economics become even more attractive.

Most agricultural biogas projects are located on dairy farms, due to the high volume of waste available. But the French company FERTIGAZ now has two sites operating at commercial swine farms. FERTIGAZ develops plants for the treatment of biodegradable waste by anaerobic digestion. Its newest installation at Plouédern (Finistère) produces biogas from a mixture of sludges, grease, food scraps, and pig manure.

The Plouédern bio-methane plant, commis-sioned in 2011, produces electricity from a 400 kW co-generator fed by biogas produced in the waste digestion process. In addition to the gas, the digested material has a liquid fraction (sent to a treatment plant) and a solid fraction (composted and dried). Electricity is sold to the grid, and the heat is used to accelerate compost drying.

Pig manure is used to dilute the organic waste before it enters the digester. Due to its limited fuel value, surplus manure is biologically treated at the on-site water treatment plant.

Agricultural biogas extraction offers several benefits:

� Producing green and

renewable energy

� Reducing pollution and

greenhouse gases

� Reducing odors and pathogens

� Transforming waste into

valuable bio-fertilizer

In order for the process to function correctly, the digested product must be dewatered. For this operation, FERTIGAZ chose ANDRITZ centrifuge technology. Taking into consid-eration the fibers and abrasive materials in the digested product, ANDRITZ installed its D-series decanter.

The D3L centrifuge is sized to treat the four tons of dried matter daily. It has a cylindri-cal/conical rotor which allows the scroll to turn at a slightly higher rate than the bowl to ensure solids extraction. The scroll extends the holding time within the rotor (increasing dryness) while optimizing clarified liquid runoff to achieve the best capture rates.

Thanks to a clever “chain” system on the two motor inverters, energy produced by the generator is reused by the main motor. This reduces power consumption by as much as 25%.

With water conservation in mind, FERTIGAZ wanted a solution that achieved low con-sumption while obtaining dryness levels of 25% – with quality acceptable to the an-aerobic reactor. After dewatering, the solids are sent to compost. The liquid, loaded with dissolved pollutants, is sent to the on-site water treatment plant.

ANDRITZ decanters are employed to take the water out of digested materials so that the solids can be composted and dried. The extracted liquid is processed in an on-site water treatment plant.

2928 POWERSPECTRUM

French pigs help produce l’électricité

The production of biogas from manure is an area of alternative energy that is of interest to many livestock producers. Similar to natural gas, methane captured by a biogas system can be substituted for conventional fossil fuels to provide heat, electrical power, or transportation biofuel and therefore reduce greenhouse gas emissions.

In-depth analysis of the costs of anaerobic digester systems on farms – compared to conventionally purchased electricity, natural gas, and liquid propane – shows that anaero-bic digester systems could produce energy for many livestock operations at a cost at

Agricultural biogas is produced from “waste” farm materials such as manure, slurry, silage, etc. The methane gas – a greenhouse gas 21 times more potent than CO2 – becomes the feedstock for small in-farm power plants. Properly treating the residues collected from the digestion process at FERTIGAZ, a French company, is a job for ANDRITZ centrifuges.

or below commercial natural gas prices. If excess energy in the form of electricity or heat is sold, the economics become even more attractive.

Most agricultural biogas projects are located on dairy farms, due to the high volume of waste available. But the French company FERTIGAZ now has two sites operating at commercial swine farms. FERTIGAZ develops plants for the treatment of biodegradable waste by anaerobic digestion. Its newest installation at Plouédern (Finistère) produces biogas from a mixture of sludges, grease, food scraps, and pig manure.

The Plouédern bio-methane plant, commis-sioned in 2011, produces electricity from a 400 kW co-generator fed by biogas produced in the waste digestion process. In addition to the gas, the digested material has a liquid fraction (sent to a treatment plant) and a solid fraction (composted and dried). Electricity is sold to the grid, and the heat is used to accelerate compost drying.

Pig manure is used to dilute the organic waste before it enters the digester. Due to its limited fuel value, surplus manure is biologically treated at the on-site water treatment plant.

Agricultural biogas extraction offers several benefits:

� Producing green and

renewable energy

� Reducing pollution and

greenhouse gases

� Reducing odors and pathogens

� Transforming waste into

valuable bio-fertilizer

In order for the process to function correctly, the digested product must be dewatered. For this operation, FERTIGAZ chose ANDRITZ centrifuge technology. Taking into consid-eration the fibers and abrasive materials in the digested product, ANDRITZ installed its D-series decanter.

The D3L centrifuge is sized to treat the four tons of dried matter daily. It has a cylindri-cal/conical rotor which allows the scroll to turn at a slightly higher rate than the bowl to ensure solids extraction. The scroll extends the holding time within the rotor (increasing dryness) while optimizing clarified liquid runoff to achieve the best capture rates.

Thanks to a clever “chain” system on the two motor inverters, energy produced by the generator is reused by the main motor. This reduces power consumption by as much as 25%.

With water conservation in mind, FERTIGAZ wanted a solution that achieved low con-sumption while obtaining dryness levels of 25% – with quality acceptable to the an-aerobic reactor. After dewatering, the solids are sent to compost. The liquid, loaded with dissolved pollutants, is sent to the on-site water treatment plant.

ANDRITZ decanters are employed to take the water out of digested materials so that the solids can be composted and dried. The extracted liquid is processed in an on-site water treatment plant.