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Filter Capacity

The document analyzes the design capacity of existing filters at a treatment works. It determines that: 1. The surface loading rate on the filters of 118.42 m3/m2/d when operating at the design capacity of 2700 m3/d is within the recommended range of 4-6 m3/m2/hr. 2. Therefore, the existing filters are adequate for the design capacity of the treatment works. 3. The key parameter checked is the surface loading rate on the filters to determine if the existing filters can handle the full design capacity of the plant.

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Noopur Pancholi
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208 views6 pages

Filter Capacity

The document analyzes the design capacity of existing filters at a treatment works. It determines that: 1. The surface loading rate on the filters of 118.42 m3/m2/d when operating at the design capacity of 2700 m3/d is within the recommended range of 4-6 m3/m2/hr. 2. Therefore, the existing filters are adequate for the design capacity of the treatment works. 3. The key parameter checked is the surface loading rate on the filters to determine if the existing filters can handle the full design capacity of the plant.

Uploaded by

Noopur Pancholi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
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Design Capacity check for existing filters

Input
Description Notation Unit Value
No. of filters provided N Nr 3
Effective sand area of filters
Length L m 4
Width W m 1.9
Treatment works design capacity Q m3/d 2700

Calculation
Surface area of each filter A m2 7.6
Total surface area of filtration At m2 22.8
Surface loading rate on filters when Q/At m3/m2/d 118.4210526316
operating at design capacity
m3/m2/hr 4.9342105263

Recommended surface loading rate m3/m2/hr 4 to 6


for filter
Existing filters (Condition) Are adequate for design capacity of
Input
calculation Note:
Output 1 The Surface loading rate is the most import
2 The adequency of the existing filters will be

2700 m3/d
e loading rate is the most important parameter in the design of filters.
ency of the existing filters will be checked by checking the surface loading rate on the filters when the treatment works is operating at full c
works is operating at full capacity
Input 80000
Chart Title
Description Notation Unit Value 70000
Pressure drop delta P kPa 38 f(x) = 33091.1874716919 exp( 187.7365235
60000 R² = 0.982841721
Filtration area A m2 0.07
50000
Slurry concentration Cs kg solid/m3 24

t/v (s/m3
40000
Viscosity myu Pa.s 0.89
30000

V(m3) t(s) t/V (s/m3) 20000


0.0005 19 38000 10000
0.001 38 38000 0
0 0.0005 0.001 0.0015 0.002 0.0025 0.0
0.002 95 47500
0.003 178 59333.33333 Filtration volume (v) (m3)
0.004 280 70000

Kp/2 Slope 9.64E+06 9.64E+12


B intercept 3.03E+04
RSQ 0.97730792
slope= Kp/2 Kp s/m6 1.93E+07
Specific resistance α m/kg 1.68E+08
Rm 1/m 9.06E+07 9.06E+07

correl 0.98858885
Total volume of filtrate for
entire period at the end of
filtration
Vf m3 3.37
Washing of filter cake (dV/dt)f m3/s 3.85E-09
Time of washing t s 8.76E+07
min 1.46E+06
hr 2.43E+04
Chart Title

.1874716919 exp( 187.7365235354 x )


41721

0.0015 0.002 0.0025 0.003 0.0035 0.004 0.0045

Filtration volume (v) (m3)

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