Partial List Of Suppliers

Degremont-Cottrell, Inc.; Dorr-Oliver, Inc.; FMC Corp.; Dravo Corp.; Sybron Corp.; Edens Equipment Co.; Eimco Process Equipment; Envirex; General Filter Co.; Great Lakes Environmental; Lakeside Equipment Corp.; Komline-Sandersen Engineering Corp.; Neptune MicroFloc, Inc.; Parkson Corp.; U.S. Filter, Permutit Co.; Walker Process; Zimpro Environmental Inc.; Zurn Industries, Inc.

Sedimentation, sometimes called clarification, is generally used in combination with coagulation and flocculation to remove floc particles and improve subsequent filtration efficiency. Omitting sedimentation prior to filtration results in shorter filter runs, poorer filtrate quality, and dirtier filters that are more difficult to backwash. Sedimentation is particularly necessary for high-turbidity and highly colored water that generates substantial solids during the coagulation and flocculation processes. Sedimentation is sometimes unnecessary prior to filtration (direct filtration) when the production of flocculation solids is low and filtration can effectively handle solids loading.

Sedimentation is sometimes used at the head of a water treatment plant in a presedimentation basin, which allows gravity settling of denser solids that do not require coagulation and flocculation to promote solid separation. The application of a presedimentation basin is most common where surface water has a high silt or turbidity con tent. Some wastewater treatment plants use coagulation before presedimentation basins.

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