Sludge Management

Sludge Management - from the bottom of the tanks and sent...

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Sludge Management In the wastewater treatment process, sludge accumulated during the different stages of treatment must be treated and disposed of in a safe and effective manner. In doing so, organic matter and disease-causing organisms, known as pathogens, are greatly reduced in number. At the Landis Sewerage Authority, the gravity thickening method is used in order to separate sludge from free water. In this process, sludge flows with water from the aeration tanks into a large circular settling tank, which contains a raking arm that encompasses the tank’s entire diameter. This raking arm turns in a slow circular motion in order to create a slow stirring effect and ensure that sludge settles to the bottom of the tank. Water from the top of the tank then flows through a channel to the next portion of the treatment process, while the sludge is drained
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Unformatted text preview: from the bottom of the tanks and sent to anaerobic digester tanks. Anaerobic digester tanks are utilized to treat the sludge built up during the course of the treatment process. In anaerobic digestion, microorganisms break down sludge in the absence of oxygen and produce methane gas as a byproduct. The Landis Sewerage Authority then burns off the methane gas into the atmosphere. During the spring, summer, and fall, the remainder of the sludge from the treatment process is disposed of at a 380 acre agricultural site, where it provides nutrients for corn and several varieties of hay. During the winter, when crops are not likely to grow, the sludge is stored in two 1.9 million gallon tanks....
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This note was uploaded on 11/17/2011 for the course ENGINEERIN 1 taught by Professor Cag during the Spring '08 term at Rowan.

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