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Title: Feasibility study of vacuum filtration systems for dewatering dredged material
Authors: Long, Bruce W.
Grana, Dominic J.
Keywords: Filters and filtration
Dredged material
Dredging spoil
Dredged Material Research Program (U.S.)
Publisher: U.S. Army Engineer Waterways Experiment Station
Series/Report no.: Technical Report (Dredged Material Research Program (U.S.)) ; no. Technical Report D-78-5
Abstract: A laboratory study was performed of the feasibility of dewatering dredged material by vacuum filtration. Characterizations were made for samples from six disposal areas: Penns Neck Spillway, Apalachicola Bay, Mobile Bay, Toledo Harbor, Craney Island, and Browns Lake. Investigations of particle size distribution, specific resistance to filtration, filter leaf studies, and bench-scale vacuum filtration studies were conducted. The samples collected were diluted to between 8 and 25 percent solids by weight and chemically conditioned for the various testing procedures. Seven chemical coagulants were investigated. The results attained indicated that dredged material from the different sites could be effectively dewatered to 45 to 60 percent solids (depending on the site) using lime dosages of 7 to 10 percent of the solids in the sample. Filter yields of up to 9.0 lb solids per square foot per hour were observed. The quality of the filtrate was generally in the range of 500 to 1500 mg/ℓ suspended solids. Field studies of a pilot plant are recommended to further evaluate the operating parameters of vacuum filtration under actual conditions.
Description: Technical Report
Gov't Doc #: Technical Report D-78-5
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Technical Report

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