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A town is required to treat $4.2 \: m^3/min$ of raw water for daily domestic supply. Flocculating particles are to be produced by chemical coagulation. A column analysis indicated that an overflow rate of $0.2$ mm/s will produce satisfactory particles removal in a settling basin at a depth of $3.5$ m. The required surface area (in $m^2$) for settling is

  1. $210$
  2. $350$
  3. $1728$
  4. $21000$
in Water and Waste Water Quality and Treatment edited by
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