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TURNING UP THE HEAT ON BIOSOLIDS: AN EVALUATION OF HEAT DRYING TECHNOLOGIES, DESIGN CONSIDERATIONS AND MARKETS

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In recent years growing public opposition to land application of biosolids has resulted in widespread reduction of Class B biosolids disposal sites. For this reason, agencies have been turning to engineers to come up with different methods of producing Class A Biosolids. The heat-dried biosolids industry has undergone significant development, especially in the last few years. Environmentally, a desire to use the biosolids for nutrient value rather than land filling has spurred the trend to land application. Economically, the six-fold weight reduction achieved through drying compared to dewatered cake makes some projects cost-effective on a disposal fee basis alone.

Heat drying of biosolids had historically been popular at medium to large plants in urban areas of the eastern U.S.A., Canada and around the world. There is a recent, growing trend to biosolids drying at the smaller plants, illustrated by a biosolids drying installation around the U.S from 0.33 to 28 million gallons per day (mgd) capacity plants.
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Document Type: Research Article

Publication date: 2004-01-01

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