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Effect of Dryer Feed Solids on Product Quality at Thermal Drying Facilities

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Abstract:

In recent years publicly owned treatment works have increasingly turned to thermal drying to treat municipal biosolids further following mechanical dewatering. Thermal drying significantly reduces the mass and volume of solids which must be handled and produces a biosolids product that has potential applications across a broad spectrum of beneficial use markets. However, to generate interest in the heat-dried product, it is necessary to define the physical and chemical characteristics of the product that may be of interest to potential end users. While the chemical characteristics of the biosolids, such as nutrients, pollutant concentrations, etc. are altered little during the drying process, the physical characteristics depend on the feed solids characteristics to the dryer and dryer operations. Dryer operations are sensitive to changes in feed solids characteristics. Deviation of feed characteristics outside acceptable ranges can cause significant dryer operations problems and also affect the product quality from the dryers. Establishing acceptable feed characteristics and monitoring those characteristics during operation is critical to establishing efficient drying system operation and maintaining good product quality.

Keywords: Digested; Monitoring; Pre-Treated; Process Optimization; Product Quality; Raw; Solids Characteristics; Thermal Drying

Document Type: Research Article

DOI: https://doi.org/10.2175/193864709793951946

Publication date: 2009-01-01

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