New Gravity/Pressure Unit Cuts Sludge Dewatering Costs

by Eugene E. Dallaire, Assoc. Editor; Civil Engineering Magazine, New York, NY 10017,

Serial Information: Civil Engineering—ASCE, 1976, Vol. 46, Issue 1, Pg. 69-73

Document Type: Feature article

Abstract: A new device for dewatering sludges from either industrial or municipal waste treatment plants promises to cut both initial capital and operating costs over more traditional methods such as vacuum filtration — at least for smaller waste-treatment plants. Known as the Ecodyne Smith & Loveless gravity/pressure dewaterer, the device dewaters sludge like this: sludge falls onto a moving screen, where water drains out by gravity; the sludge then goes through a series of rollers that squeeze more water out — similar to the old washing-machine ringers. In this article, several plant operators report both advantages and disadvantages of using the equipment. In a municipal treatment plant in Montgomery County, Texas, for instance, the sludge dewatering facility operates almost completely automatically. After leaving the dewaterer, the sludge falls onto a conveyor belt, is carried up an inclined plane, where it falls into a waiting truck, which when filled, carries the sludge to a landfill site.

Subject Headings: Dewatering | Equipment and machinery | Sewage | Sludge | Waste disposal |

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