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INFLUENT FINE SCREENING FOR IMPROVED BIOSOLIDS QUALITY

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Beneficial reuse of biosolids has been a longstanding practice in the industry, particularly with the implementation of the 503 regulations. A more recent trend in the industry, which allows more widespread distribution of biosolids, is the implementation of advanced digestion processes, such as temperature-phased anaerobic digestion (TPAD), in order to achieve that goal. Class A biosolids, in particular, can be used to produce a soil-like material which has the advantage of potential distribution to commercial or residential users without limits as to use. The end material for this application could be an air dried product of granular nature with a moisture content of approximately 65 percent total solids, a cake material such as from a centrifuge with a moisture content of approximately 25 to 30 percent total solids, or possibly a composted material. One major concern of beneficial reuse is the avoidance of discernable plastics or other materials in the distributed product that might decrease the product's marketability. One method to address this concern is the implementation of fine screening, either of the sludge stream or of the entire plant influent stream, in order to remove undesirable materials from the sludge, and hence the produced end product. This paper will describe the evaluation of various potential screening options to achieve the stated goal and how one utility implemented those options.
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Document Type: Research Article

Publication date: 2003-01-01

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