Planet Earth Weekly

Climate Change and Renewable Energy: Saving Our Planet for Future Generations

FROM WASTE TO ENERGY

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wast managemet sweeden

By Lin Smith

August 11, 2013–Sweden, a country of 9 million people, is one of our planet’s leaders in creating a plan to reduce greenhouse gas emissions. Their goal is to achieve a completely oil free economy by 2020, replacing fossil fuels with renewable alternatives before “climate change undermines national economies worldwide and diminishing oil supplies force astronomical price increases.” Their renewable alternative–turning trash into power! Although at the present time Sweden relies on other forms of energy, burning of garbage accounts for an equivalent of 810,000 homes being heated and the electrical equivalent of 250,000 homes being powered. The waste to energy plants are burning garbage faster than Swedes can produce it, so their solution? Import garbage from Norway!

Sweden sends just 1% of its residential solid waste to the landfill, recycling 50% and thermally processing 49% for heat and power generation in their WTE plants (waste to energy). Charlotta Broman, from the Ministry of the Environment in Sweden, states, “Sweden has a waste program that focuses on waste as both a resource and an environmental problem…We believe it is necessary to look at the properties of the waste. Recycling and recovery should be used for toxic-free materials only. Waste containing hazardous substances should be phased out …or be treated in environmentally sound ways. A lack of information on chemicals in products is an obstacle to achieving resource efficiency through recycling.”

Sweden (and all of Europe) has a classification hierarchy for waste management starting with the most favoured option to the least favoured option: 1.prevention of waste, 2.minimization of waste, 3.reuse of waste, 4.recycle, and the very last option, 5.dispose in landfills. A more aggressive approach to this hierarchy was drafted in March 2013 by the Zero Waste International Alliance. This Alliance, in which Europe is a part, contracted the following hierarchy for waste (best to least): 1.Reduce and conserve materials, 2. Shift incentives to stop wasting (by policies and regulations), 3.Manufacturers will design products for sustainability (don’t allow toxic wastes into consumer products or building materials), 4.Reuse, 5.Recycle, and last again, 6.Regulate disposal. Europeans want to “extract the maximum practical benefits from products and generate the minimum amount of waste” by setting standards that allow everyone to take part in the waste management planning, at the national, state, and local levels, spreading the responsibility to all. The Swedish EPA continues to “fine-tune the rules for different types of waste management, as well as produce guidance for management.”

As in Sweden, landfills for the rest of us should be the final step in the heirarchy of getting rid of garbage, as they are toxic to our environment, poisoning our atmosphere and groundwater. Landfills are sealed in the ground to keep out air and water, decomposing slowly by anaerobic bacteria, an organism that doesn’t require oxygen for growth. Once the landfill is full it is sealed. These seals can not only leak but they also release methane gas, which along with wastewater treatment gases, make up about 2.3 percent of our planet’s greenhouse gas emissions. Most landfills are not designed to decompose the garbage, only to bury it. If they were designed to decompose garbage more methane would be released into our atmosphere. According to Wikepedia, “the unclear nature of the contents of the garbage in the landfill makes its gas production difficult to predict and control….due to the continual production of landfill gas, the increase in pressure causes the gases to be released into the atmosphere…which risks fire and explosion if not released.” The gas composition from a landfill is 40-60% methane, the rest consists mostly of carbon dioxide. With more than 6,000 landfills in the U.S., the EPA has estimated garbage in our landfills contributes 650 billion cubic feet of methane per year to our atmosphere which has a large impact on our changing climate. Methane is considered 20 times more toxic to our atmosphere than CO2.

Why haven’t other countries done more to move in the direction of Sweden? We create more than 390 million tons of garbage per year in the U.S.alone. Only .3% of power in the U.S. is generated by recycled garbage, which comes mostly from manufacturers not from households. Americans have had the “not in my back yard” reaction to burning recycled waste. Len Rosen states,”you would think that with all the waste humans produce, that incineration would be a preferred method of managing garbage but that is not the case. Why? Because of concern over release of toxins in the atmosphere from burning. The amount of ash, heavy metals, dioxin, sulphur dioxide, hydrogen chloride, carbon dioide and other trace gases that burning undifferentiated garbage can produce. These byproducts of incineration are linked to climate change, acid rain, and human illness.”

But Sweden remains innovative in solving their problems of waste management. With the support of their population, recycling has become a way of life. Not accepting the haul-everything-to-the-dump attitude, they have adopted a workable solution and the most ecofriendly method on our planet. So how is Sweden handling the byproducts of incineration? “The country’s incinerators have been designed to collect the pollutants that are the byproducts of burning waste. Only the heavy metals are collected and buried in landfills. Gases going up the smokestack are scrubbed to remove dangerous chemicals, and sulphur dioxide gets converted to sulphuric acid for commercial resale. Ash is collected and exported back to Norway, where it gets used for roads and building materials. The goal is to make incineration a green energy source and Sweden is well on its way!” states Rosen.

According to the EPA, “for every ton of garbage processed at a WTE (waste to energy) facility, approximately one ton of emitted carbon-dioxide equivalent in the atmosphere is prevented. This is because the trash burned at the facility doesn’t generate methane, as it would at a landfill.” The electricity generated offsets the greenhouse gases that would be generated from coal and natural gas plants. Some landfills are trying different methods to “trap” methane and turn it in to energy, which can reduce gas emissions, but these trapped gases still generate significant emissions. According to the EPA, these plants are still releasing methane, with approximately 34% of the methane “trapped” for energy, 38% is flared, or burned, and 28% is released into the atmosphere. A 2012 report by the EPA states, ” Most of the existing data that is available to evaluate emission from landfills is based on flux box data. These measurements do not account for the majority of losses found at landfills…there is a need to better quanitify landfill gas collection efficiency.”

Reduce, Reuse, and Recycle and know where your garbage goes!

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Author: Planet Earth Weekly

My goal, as a responsible adult, is to leave a planet that people, plants, and animals can continue to occupy comfortably. I am an educator by profession. While educating myself on Climate Change and Renewable Resources, I hope to share my knowledge and images with those that share my concern. Dr. John J. Hidore is a retired professor from the University of North Carolina at Greensboro and I am proud to call him my Uncle. His work has taken him to regions across the globe—including the Middle East, where he conducted research for a year in the Sudan. He has written many books, such as Climatology: An Atmospheric Science and Global Environmental Change.----Linn Smith

One thought on “FROM WASTE TO ENERGY

  1. Reblogged this on BioEnergy Consult Blog and commented:
    Sweden sends just 1% of its residential solid waste to the landfill, recycling 50% and thermally processing 49% for heat and power generation in their WTE plants (waste to energy).

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