Feasibility Study of Vacuum Filtration Systems for Dewatering Dredged Material.
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 are recommended to further evaluate the operating parameters of vacuum filtration under actual conditions. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1978
- Accession Number
- ADA053773
Entities
People
- Bruce W. Long
- Dominic J. Grana