In order to solve a historical environmental problem, the São Paulo State Sewage Company (Sabesp) launched a notice this month to build an electric power generation station from the biogas that is naturally produced during the treatment process Of sewage sludge and with that eliminate the volume of sludge discarded in the landfill - 500 tons per day.
The contract will be made through a 30-year concession contract with the private initiative at the Sewer Treatment Station (ETE) in Barueri, the largest in Greater São Paulo. It treats more than 20 billion liters of sewage per month of 4.4 million people in the region, including part of the capital. Sabesp will supply the sludge and biogas generated in the ETE and the company will come with the technology to generate thermal and electric energy.
Biogas is a fuel generated in the process of biodigestion for the drying of the sludge that stays in the station after the sewage treatment and can become energy. However, today this energy potential is burned in the ETE itself and released into the atmosphere, while the dry sludge is transported to the Caieiras embankment, in Greater São Paulo, where it is decomposed.
In contrast to the disposal of sludge in the landfill used by the City of São Paulo, Sabesp treats all the slurry of the city's garbage decomposition. According to the company's metropolitan director, Paulo Massato, with the new business, the sludge can also be used by the partner to produce biogas, and any remaining waste can no longer be disposed of in the landfill, according to the National Solid Waste Plan , Sanctioned in 2010.
"The first concern is that we are depleting landfills. We have been looking for the best technology available in the world to use sludge and biogas to generate energy," Massato said.
The notice states that in the first five years of the concession, 5 megawatts of energy and 10 megawatts must be generated from the sixth year.
This energy is sufficient to supply the energy consumption of the ETE itself from 60% to 75%.
"This technology is well known and brings environmental and economic benefits. The decomposition of the sludge in the landfill emits greenhouse gases harmful to the environment," explains chemist Biagio Fernando Giannetti, a specialist in sustainability.
The information is from the newspaper O Estado de S. Paulo.
The contract will be made through a 30-year concession contract with the private initiative at the Sewer Treatment Station (ETE) in Barueri, the largest in Greater São Paulo. It treats more than 20 billion liters of sewage per month of 4.4 million people in the region, including part of the capital. Sabesp will supply the sludge and biogas generated in the ETE and the company will come with the technology to generate thermal and electric energy.
Biogas is a fuel generated in the process of biodigestion for the drying of the sludge that stays in the station after the sewage treatment and can become energy. However, today this energy potential is burned in the ETE itself and released into the atmosphere, while the dry sludge is transported to the Caieiras embankment, in Greater São Paulo, where it is decomposed.
In contrast to the disposal of sludge in the landfill used by the City of São Paulo, Sabesp treats all the slurry of the city's garbage decomposition. According to the company's metropolitan director, Paulo Massato, with the new business, the sludge can also be used by the partner to produce biogas, and any remaining waste can no longer be disposed of in the landfill, according to the National Solid Waste Plan , Sanctioned in 2010.
"The first concern is that we are depleting landfills. We have been looking for the best technology available in the world to use sludge and biogas to generate energy," Massato said.
The notice states that in the first five years of the concession, 5 megawatts of energy and 10 megawatts must be generated from the sixth year.
This energy is sufficient to supply the energy consumption of the ETE itself from 60% to 75%.
"This technology is well known and brings environmental and economic benefits. The decomposition of the sludge in the landfill emits greenhouse gases harmful to the environment," explains chemist Biagio Fernando Giannetti, a specialist in sustainability.
The information is from the newspaper O Estado de S. Paulo.
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