Download PDF by James E. Smith: Drinking Water Treatment Facilities

By James E. Smith

ISBN-10: 0815512627

ISBN-13: 9780815512622

ISBN-10: 0815519451

ISBN-13: 9780815519454

Describes applied sciences for upgrading latest or designing new ingesting water therapy amenities. Prefiltration, filtration, disinfection, and natural and inorganic contaminants are coated. specific options for small group water therapy vegetation (2500-100,000 gpd) are defined, besides thirteen "case studies".

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1 Improving Mixing Different mixing equipment can improve turbulence patterns in the basin to maximize the formation of flocculated particles and minimize the destruction of previously formed floc. There are several types of mixers used for flocculation, with the mechanical mixer being the most common, Mechanical mixers for flocculation basins are differentiated by overall design and type of agitator The most important goal in flocculator design is the efficient removal of floc during sedimentation and filtration.

The types of devices used for rapid mixing include mechanical mixers, static mixers, jet injection mixers, and coagulant diffusers. Table 3-8 presents 24 Upgrading Existing or Designing New Drinking Water Treatment Facilities Table 3-3. Category I 2 3 4 5 6 7 8 9 10 11 12 Estimated Costs for Supplementing Surface Water Treatment by Adding Alum Feed facilltiea (to "'9'1) ($t978) Plant Capacity. 90 404 1,275 Average Flow. 50 205 650 Capital Cost. 52 Total Cost. S. EPA (1979). Tsble 3·4. 50 205 650 Capital Cost.

The contact time required for successful coagulation depends on which of the two primary coagulation processes - adsorption or sweep-floc (enmeshment) - is necessary for the particular raw. Adsorption takes place very quickly; sweep-floc coagulation takes longer. In adsorption, if polymers are not formed during the application process, then coagulation can occur in microseconds. Ifpolymers are formed, coagulation will still take less than a second. Sweep floc, a process that is triggered by large doses of alum, ferric chloride, and other precipitative coagulants, takes from 1 to 7 seconds to complete.

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Drinking Water Treatment Facilities by James E. Smith

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