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Cross-flow filtration of fruit juice


Table 10.5. Operation and maintenance of the filtration technology (input)
 
Input
Parameter The centrifuge The vacuum filter The Filtomat filter unit
Use of energy (kW/h and kW/m3 juice) 30 kW/h

Juice amount:
5410,8 m3 + 3836,8 m3 =
9247,6 m3

Use of energy:
10 m3/h /30 kW/h = 1/3 m3/kW
9247,6 m3/1/3 m3/kW =
27743 kW

kW/m3 juice:
27743 kW / 9247,6 m3
= 3,00 kW/m3

 57 kW/h

BC juice amount:
871,74 m3

Use of energy:
7 m3/h /57 kW/h = 0,123 m3/kW
871,74 m3/0,123 m3/kW = 7098 kW

C juice amount:
1342,88 m3

Use of energy:
5 m3/h /57 kW/h = 0,0877 m3/kW
1343 m3/0,0877 m3/kW = 15308 kW

Total use of energy:
7098 kW + 15308 kW = 22406 kW

kW/m3 juice:
22406 kW / (871,74 m3 + 1342,88 m3) = 10,12 kW/m3

 Flow 10 m3/h, juice pump: 1 kW/h
Cleaning time 4*2 min./h

Cleaning pump: 5,5 kW/h * 8/60 = 0,73 kW/h

PLS-control system 0,2 kW/h
Total 1,93 kW/h

Juice amount:
6012 m3 + 4796 m3 = 10808 m3

Use of energy:
10 m3/h /1,93 kW/h = 5,18 m3/kW
10808 m3/5,18 m3/kW = 2086 kW

kW/m3 juice:
2086 kW / 10808 m3
= 0,193 kW/m3
Cost of energy (Kr/m3 juice) Cost of energy:
27743 kW*0,86 Kr/kW
=23859 Kr.

Kr/m3 juice:
23859 Kr / 9247,6 m3 = 2,58 Kr/m3

 Cost of energy:
22406 kW *0,86 Kr/kW = 19270 Kr.

Kr/m3 juice:
19270 Kr / (871,74 m3 + 1342,88 m3)  = 8,70 Kr/m3

 Cost of energy:
2086 kW *0,86 Kr/kW = 1794 Kr.

Kr/m3 juice:
1794 Kr / 10808 m3  = 0,17 Kr/m3
Filtration aid and costs.
(Kg perlite and the purchasing expenses Kr/m3 juice)		 None 2300 Kr/ton, 5 kg perlite/m3 juice

Amount used a year:
871,74 m3 + 1342,88 m3 = 2214,62 m3
2214,62 m3*5 kg perlite/m3 = 11073 kg

Price:
11,073 ton * 2300 Kr/ton = 25468 Kr
25468 Kr / 2214,62 m3 = 11,50 Kr/m3

 None
New water for cleaning (l/m3 and the expenses Kr/m3 juice) 500 l. /a cleaning.

ca. 2981 times cleaning/year
500 l*298 = 148900 l/year

l/m3 juice:
148900 l / 9247,6 m3 = 16,10 l/m3

Costs:
(148,9 m3 * 14,5 Kr/m3) /
9247,6 m3 = 0,23 Kr/m3

 

 2400 l / a cleaning

ca. 88 cleanings a year
2400 l * 88 times = 211200 l/year

l/m3 juice:
211200 l / (871,74 m3 + 1342,88 m3) = 95,37 l/m3

Costs:
(211,2 m3 * 14,5 Kr/m3) /
(871,74 m3 + 1342,88 m3) = 1,38 Kr/m3

 Amount for flushing BC:

0,2 l / a flush, 4 times/hour
0,2 l * 4 times/h * (6012 m3/ 10 m3/h) =
480,96 l

Amount for flushing C:
0,3 l / a flush, 4 times/hour
0,3 l * 4 times/h * (4798 m3/ 10 m3/h) =
575,76 l

Cip-cleaning:
0,2 l /a Cip-cleaning
ca. 2981 times cleaning/year
0,2 l*298 = 60 l

Total water use:
480,96 l + 575,76 l + 60 l = 1116,72 l

l/m3 juice:
1116,72 l / 10808 m3 = 0,103 l/m3

Costs:
0 Kr/m3 - the amount is covered by the water from the evaporator.
Labour cost pr. cleaning
(Kr/m3 juice)		 Automatic.
Ca. 48 hours a year.

Price:
One manhour costs: 115 Kr.
115 Kr/h * 48h = 5520 Kr
5520 Kr / 9247,6 m3 = 0,60 Kr/m3

 Non-automatic.
Ca. 8 hours a week.

Price:
One manhour costs: 115 Kr.
115 Kr/h * 8h/week * 52 weeks
= 47840 Kr
47840 Kr / 2214,62 m3 = 21,60 Kr/m3

 Automatic.
Ca. 96 hours a year.

Price:
One manhour costs: 115 Kr.
115 Kr/h * 96h = 11040 Kr
11040 Kr / 10808 m3 = 1,02 Kr/m3

1 2 times cleaning a day in the season, 3 times cleaning a week out of season:
2 times * 90 days + 3 times * (275 days / 7 days a week) = 298 times