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Hopper
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Design
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for
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Floc
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Blanket
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Given
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the
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calculated
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amount
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of
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sludge
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the
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tank
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will
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create,
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a
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continuous
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sludge
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drainage
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system
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was
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created.
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This
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was
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done
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to
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decrease
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the
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size
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of
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the
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hopper
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in
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the
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tank.
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It
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was
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desired
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to
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keep
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the
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hopper
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small
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so
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that
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there
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would
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be
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minimal
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disturbance
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in
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the
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tank.
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φ
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floc is
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the
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specific
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volume
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of
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the
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floc,
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it
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was
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found
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to
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be
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0.016.
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Most
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of
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the
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sludge
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produced
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is
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assumed
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to
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be
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made
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of
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alum.
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The
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alum
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concentration
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is
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approximately
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10
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mg/L.
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This
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alum
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concentration
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is
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used
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in
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the
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φ
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floc determination.
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The
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rate
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of
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sludge
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build-up
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is
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the
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sedimentation
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tank
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flow
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rate
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times
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φ
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floc.
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| Include Page |
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When calculated, the sludge volume accumulated over two days was determined to be 1.105 x 10^3 L. We created this hopper with a conical funnel with flex-hose connected at the bottom. This small funnel will continuously drain sludge out of the tank and into the outlet panel. The hose will be 2m long and 1.27cm (1/2")
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in
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diameter.
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The
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diameter
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was
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determined
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using
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the
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manifold
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equation
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used
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in
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the
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design
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of
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the
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effluent
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launder
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design.
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If
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no
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sludge
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consolidation
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occurs,
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then
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the
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flow
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rate
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for
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the
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sludge
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drain
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must
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equal
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φ floc~Q ~tank, or approximately 380 mL/min.
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