rate (gpm/ft²) Backwash 10 the bed will be either compacted and dirty or washed away at a particular backwash rate. In order to ensure that the two filter media particles with sizes d, and d, and densities p, and p, have the same settling velocity, the following relationship should exist:" d₁ d₂ P2 Ρ P1 - P/ 0.667 where p is the density of water. Figure 3.2.6-4 will aid engineers in selecting the proper combination of common filter materials at a particular backwash rate. Figure 3.2.6-5 compares the performances of five different types of filter bed. FILTER WASH SYSTEMS AND WASH TROUGHS The two basic types of filter backwash system are (1) fluidized bed backwash with or without surface wash and (2) air-scour with partial fluidized backwash. The first type has been used 30 25 25 20 20 TITT S.G. 1.60 1.2 S.G. 4.1 Anthracite coal S.G. 2.65 S.G. 2.60 Synthetic resin S.G. 1.27 nular activated carbon S.G. 1.40. S.G. 1.70 S.G. 1.55 S.G. 1.65 S.G. 1.35 0.5 1.0 1.5 2.0 60% Weight grain size (mm) (effective size x uniformity coefficient) 2.5 3.0 1.0 0.8 0.6 0.4 0.2 Backwash rate Rise rate (m/min) Riser Perform the media design for a dual media filter. Show all design curves and calculations on the chart shown in the reverse page. Include detailed explanations below. What is your chosen backwashing rate? How does the effective size you deduce from the chart correspond to the value you obtain by using the formula on top of the chart in the reverse side? (10 points)
rate (gpm/ft²) Backwash 10 the bed will be either compacted and dirty or washed away at a particular backwash rate. In order to ensure that the two filter media particles with sizes d, and d, and densities p, and p, have the same settling velocity, the following relationship should exist:" d₁ d₂ P2 Ρ P1 - P/ 0.667 where p is the density of water. Figure 3.2.6-4 will aid engineers in selecting the proper combination of common filter materials at a particular backwash rate. Figure 3.2.6-5 compares the performances of five different types of filter bed. FILTER WASH SYSTEMS AND WASH TROUGHS The two basic types of filter backwash system are (1) fluidized bed backwash with or without surface wash and (2) air-scour with partial fluidized backwash. The first type has been used 30 25 25 20 20 TITT S.G. 1.60 1.2 S.G. 4.1 Anthracite coal S.G. 2.65 S.G. 2.60 Synthetic resin S.G. 1.27 nular activated carbon S.G. 1.40. S.G. 1.70 S.G. 1.55 S.G. 1.65 S.G. 1.35 0.5 1.0 1.5 2.0 60% Weight grain size (mm) (effective size x uniformity coefficient) 2.5 3.0 1.0 0.8 0.6 0.4 0.2 Backwash rate Rise rate (m/min) Riser Perform the media design for a dual media filter. Show all design curves and calculations on the chart shown in the reverse page. Include detailed explanations below. What is your chosen backwashing rate? How does the effective size you deduce from the chart correspond to the value you obtain by using the formula on top of the chart in the reverse side? (10 points)
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter8: Natural Convection
Section: Chapter Questions
Problem 8.36P
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engineering
Transcribed Image Text:rate
(gpm/ft²)
Backwash
10
the bed will be either compacted and dirty or washed away at a particular
backwash rate. In order to ensure that the two filter media particles with sizes
d, and d, and densities p, and p, have the same settling velocity, the following
relationship should exist:"
d₁
d₂
P2
Ρ
P1
-
P/
0.667
where p is the density of water.
Figure 3.2.6-4 will aid engineers in selecting the proper combination of
common filter materials at a particular backwash rate. Figure 3.2.6-5 compares
the performances of five different types of filter bed.
FILTER WASH SYSTEMS AND WASH TROUGHS The two basic types of filter
backwash system are (1) fluidized bed backwash with or without surface wash
and (2) air-scour with partial fluidized backwash. The first type has been used
30
25
25
20
20
TITT
S.G. 1.60
1.2
S.G. 4.1
Anthracite coal
S.G. 2.65
S.G. 2.60
Synthetic resin S.G. 1.27
nular activated carbon S.G. 1.40.
S.G. 1.70
S.G. 1.55
S.G. 1.65
S.G. 1.35
0.5
1.0
1.5
2.0
60% Weight grain size (mm) (effective size x uniformity coefficient)
2.5
3.0
1.0
0.8
0.6
0.4
0.2
Backwash
rate
Rise rate
(m/min) Riser
Perform the media design for a dual media filter. Show all design curves and calculations on the chart shown in the
reverse page. Include detailed explanations below. What is your chosen backwashing rate? How does the effective
size you deduce from the chart correspond to the value you obtain by using the formula on top of the chart in the
reverse side? (10 points)
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