Proposed $500M waste-to-energy plant in Arecibo would adopt U.S. methods
By Melissa Zayas-Moreno
Special contributor to News is my Business
Rochester, MA — Puerto Rico residents generate between 11,000 and 12,000 tons of waste, or about five pounds per person, every day that goes straight to the island’s landfills. However, through the proposed Puerto Rico Resource and Renewable Energy Project, that habit can change and what is considered waste today could be recycled as fuel in the near future.
In about six months, construction of the first plant capable of receiving up to 2,100 tons of waste per day to convert it into biofuel will begin in Arecibo. The proposed $500 million waste-to-energy plant owned by Albany, NY-based Energy Answers would generate 80 megawatts of energy and would create some 150 new ‘green collar’ permanent jobs.
This reporter recently got the opportunity to travel to the South Eastern Massachusetts waste-to-energy facility in Rochester, which for the past 20 years has been using the same technology that would be installed at the Arecibo plant to address the island’s mounting solid waste problem.
The SEMASS plant collects more than 3,000 tons of waste on a daily basis. Under strict U.S. Environmental Protection Agency standards, and the watchful eyes of neighbors and farmers, the plant recovers, recycles and composts the waste to draw non-polluting fuel.
“To face economic challenges, citizens have to learn how to deal with garbage and understand where it’s coming from,” said Energy Answers Vice President Mary Ann Mahoney, during the visit to SEMASS in Rochester, MA. “Recyclable material is separated.”
The Northeastern plant produces 12 million megawatt hours of electricity, industrial steam, has recovered more than 700,000 tons of ferrous metals and 60,000 tons of non-ferrous metals, and recycles thousands of gallons of waste sludge. This operation uses regulated solid waste to maintain a clean environment.
“The technology used in this resource recovery facility consists of recycling, composting and reusing. With garbage there are only two options, to deposit it in a landfill or use it as a fuel and recycle more material. But a landfill is a waste of space,” Mahoney added.
Reuse, recycle, compost
The first step in the waste-to-energy conversion process consists of reusing, recycling and composting solid wastes. Most of the materials used in homes have a second use, others have to be deposited in the trash. In the case of the resource recovery plant, materials that aren’t recyclable are processed.
The remaining material is then used to produce biofuel. Waste is shredded to facilitate the burning process. When it becomes ashes, it has to be stabilized using lime based mineral obtained from landfills.
The next step consists of generating clean energy as the fuel goes through three boilers, which generate water vapor to produce energy. It can also generate ash, which must be disposed as a sanitary filing.
“The burn is done in an efficient manner without making big smoke to maintain the highest level of control,” she said.
Gas emissions produced during the process of creating fuel go through sophisticated filters, reducing contaminants to the environment, company officials said. After the combustion process, ferrous and non-ferrous metals are recovered, and aggregates can be used in other industries. The EPA requires continuous emissions monitoring that produce computerized daily reports.
Since its establishment in 1991, the SEMASS facility has processed more than 20 million tons of waste. Interestingly, coins found in the process of sifting the material are returned to the U.S. Treasury Department. To date, that amount tops out at about $1,000 a day.
Rochester claims benefits
During the trip to the facility, this reporter also spoke to cranberry farmers working next to the operation who said the SEMASS complex has not caused problems to fruit crops near the plant or upon the health of the neighbors, said farm owner Brad Morris.
That information is relevant to the island, as the proposed plant would be located in a town anchored by farming.
Meanwhile, information provided by the Plymouth County Directorate of Public Works shows that the annual average of solid waste generated by some 11,552 families at three transfer stations is 11,782 tons. The solid waste delivered to those transfer stations benefits both the town and the SEMASS plant, as residents have to pay an annual fee to dispose of their trash.
That money, or about $1.9 million, is used for education programs. The waste not processed at the transfer stations is sent to SEMASS for recycling, to generate fuel that is subsequently sold to the state’s power authority. At present, 64 percent of the recyclable material is obtained from Plymouth county.
In Puerto Rico, Energy Answers would sell 70 of the 80 megawatts of the energy it would produce to the Puerto Rico Electrical Power Authority, at a reasonable cost. But because EPA’s regulations are strict, only 20 percent of solid waste generated on the island can be used in waste-to-energy projects.
Island waste facilities have short lifespan left
At present, there are about 30 landfills on the island, most with limited lifespans left. So, it would seem that the private initiative proposed for Arecibo, which requires no government financing for its construction or operation, would be a reasonable solution to the looming problem.
Javier Vélez-Arocho, former Department of Natural and Environmental Resources Secretary, said five landfills are expected to close during the next decade, so “it’s vital to find a way to manage waste because it will save space used in landfills and reduce contamination, while generating energy.”
Meanwhile, Alexis Molinares, ecologist and Energy Answers consultant said rather than burning fuel, “trash would be burned to create fuel since most of the material has a second use.”
The veteran environmentalist added that this recycling operation would lessen the island’s reliance on its limited landfill space and reduce the impact on water, land and air resources.