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How to convert garbage waste into power?
The development process, in the modern day world, is taking place at a frantic pace. Right from early morning wake up till going to bed in the night for rest, people tend to make use of several facilities for making their life simpler. The conveniences that come in handy for doing things conveniently leave behind a lot of garbage each day.
Be it pollution-causing industries, transport vehicles, or leftover food items all contribute to the generation of waste in cities. By dumping waste into the trash bin, most of us heave a sigh of relief for doing a commendable thing! Is it really so? No, not at all.
The tones of garbage generated each day in cities and metropolitan areas are rushed to landfill sites and dumped there. Once, a site is filled to the brim, then the search for another alternative place begins and it goes on.
Efforts made for safe disposal of garbage waste in some other places is resulting in generation of power and solid waste. This again poses problems if not properly managed by the units. However, zero waste projects are yet to fulfill the long visualized plan of disposing waste material safely and securely.
To meet this gap, St. Lucie County in Florida is moving ahead with a plan to make use of the garbage for generating cleaner power and reuse the solid waste. The county is planning to build a plant wherein the waste material will be vaporized to produce clean power that will be connected to the grid. It is said to be much cleaner than other incineration works. The design of the plant is also unique as it will be using plasma arcs to burn the garbage material and turn some of the left over waste into rock-like stuff.
The powerful arcs operating at temperatures hotter than sun vaporize garbage of all varieties into combustible gas, which is expected to wheel turbines so as to generate 120 megawatts of power. The plant is designed to handle sludge coming out of the waste water treatment and turn into a slag, useful for laying roads. Additionally, the plant is run with the power generated by it and essentially requires no supply from outside.
The plant is expected to handle 3,000 tons of garbage a day and reduce the pressure for finding new landfill sites that may be needed for future requirements. The plasma-arc facility is going to operate at full capacity and make use of 4.3 million tons of garbage collected so far for the next 18 years and make the place cleaner than ever before.
The garbage brought into the plant will be sent on conveyor belts into the cylindrical cupolas where the material will be exposed to temperatures of more than 10,000 degrees of Fahrenheit. The heat generated by the plasma-arc facility is expected to vaporize all of the waste material in a closed-loop facility leaving no harmful gases into the atmosphere.
The St. Lucie County officials are convinced with the benefits likely to accrue to the area with the plant. They estimate that if the entire garbage generated in the United States is put to use in plasma-arc plants, they are expected to generate power equivalent to 25 nuclear power plants. It is also significant to note that the entire cost of the project, $425 million to be made by a private agency, will be recovered in two decades through the sale of power and sludge. In the process, the county is expected to free some landfill sites of the piles of waste material and generate clean power, and be a role model for others in safe disposal of garbage.
Chandra Sekhar
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