7/31/2019 Pressure Leaf Clarification Costing

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PRESSURE LEAF CLARIFICATION COSTING.XLSPressure leaf filter sizing and costing - effect of cycle time

capital and precoat costs considered

INPUTS: ******** ******** ******** ******** ********Volume filtered: 3 m^3 ********in unit time: 3600 seconds ********Viscosity: 0.01 Pa.s ********Cake specific resistance: 2E+11 m/kg ********Cloth resistance: 1E+11 m^-1 ********Slurry concentration: 50 kg/m^3 ********Max. pressure differential: 4.5 Bar ********Downtime as % of cycle: 30 % ********Precoat depth: 2 mm ********Day length: 14 hours ********

Days per year: 350 days ********Precoat bulk density: 350 kg/m^3 ******** Filtrate rate:Cost of filter aid: 350 /tonne ******** mu.Rm.q:

******** ******** ******** ******** ******** mu.alpha.w.q:Cycle ******** Form Volume Filter Filter Number Precoattime ******** time filtrate area cost precoats cost(hours) ******** (hours) (m^3) (m^2) () (annual) ()

1.0 ******** 0.7 2.1 20.7 15267 4900 248122.0 ******** 1.4 4.2 28.8 20600 2450 173053.0 ******** 2.1 6.3 35.1 24588 1400 12038

4.0 ******** 2.8 8.4 40.4 27895 1050 103875.0 ******** 3.5 10.5 45.0 30773 700 77236.0 ******** 4.2 12.6 49.2 33349 700 84457.0 ******** 4.9 14.7 53.1 35699 700 91088.0 ******** 5.6 16.8 56.7 37870 350 48639.0 ******** 6.3 18.9 60.1 39898 350 5153

10.0 ******** 7.0 21.0 63.3 41805 350 542711.0 ******** 7.7 23.1 66.3 43610 350 568812.0 ******** 8.4 25.2 69.2 45326 350 593813.0 ******** 9.1 27.3 72.0 46966 350 6177

14.0 ******** 9.8 29.4 74.7 48538 350 6407

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C o s t s , p o u n d

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7/31/2019 Pressure Leaf Clarification Costing

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0.0008333 m^3/s833333.3383333333

Annual Oil Cost percost cleared volume() (m^3) (/m^3)

40079 10290 3.8937905 10290 3.6836625 8820 4.15

38282 8820 4.3438496 7350 5.2441793 8820 4.7444807 10290 4.3542733 5880 7.2745051 6615 6.8147232 7350 6.4349298 8085 6.1051264 8820 5.8153143 9555 5.56

54945 10290 5.34

5.0 10.0 15.0

Cycle time, hours.

FilterPrecoat

Total