Filtration ensures acceptable suspended solids concentrations in the finished water even when upsets occur in the clarification processes.Ĭonventional gravity and pressure rapid filters operate downflow. Clarifier effluents of 2-10 NTU may be improved to 0.1-1.0 NTU by conventional sand filtration. In most water clarification or softening processes where coagulation and precipitation occur, at least a portion of the clarified water is filtered. For example, anthracite filtration is used to remove residual precipitated hardness salts remaining after clarification in precipitation softening. Wastewater filtration helps users meet more stringent effluent discharge permit requirements.įiltration, usually considered a simple mechanical process, actually involves the mechanisms of adsorption (physical and chemical), straining, sedimentation, interception, diffusion, and inertial compaction.įiltration does not remove dissolved solids, but may be used together with a softening process, which does reduce the concentration of dissolved solids. This prepares the water for use as potable, boiler, or cooling make-up. Filtration is used in addition to regular coagulation and sedimentation for removal of solids from surface water or wastewater.
0 Comments
Leave a Reply. |