Organic Waste Recycling

Characteristics of organic wastes 41

stations of the palm oil mills. The characteristics of these wastewaters at 50
percentile values are given in Table 2.12.
Table 2.11 Probability of wastewater flows per ton of FFB processed at different
measuring stations of palm oil mills (Thanh et al. 1980)
Flow in m^3 /ton FFB (m^3 /hour)
Palm oil
mill

Measuring station

(see Figure 2.4)

50

Percentile*

70

Percentile*

80

Percentile*

90
Percentile*
Plant A
(Malaysia)

1. Oil clarification
   room

1.04(22.0) 1.14(24.8) 1.21(26.5) 1.31(29.0)

2. Boiler house and
   hydrocyclones

0.49(10.5) 0.57(12.5) 0.62(13.8) 0.70(16.0)

3. Sterilizer
   building and press
   station

0.76(15.8) 0.84(17.5) 0.89(18.8) 0.96(20.6)

4. Combined flow
   (1+2+3)

2.32(47.0) 2.50 (49.8) 2.60 (51.5) 2.75(54.0)

Plant B
(Malaysia)

1. Oil clarification
   room

1.25(15.5) 1.50 (18.0) 1.68 (19.5) 1.94(22.0)

2. Boiler house,
   sterilizer building
   and hydrocyclones

1.90(21.0) 2.21(23.7) 2.43(25.7) 2.80(28.5)

3. Combined flow
   (1+2)

3.23(37.0) 3.72(42.0) 4.10(46.0) 4.60(51.0)

Plant C
(Malaysia)

1. Sterilizer
   building

0.11(2.2) 0.15(2.7) 0.17(3.1) 0.22(3.8)

2. Oil clarification
   room

1.30(22.5) 1.60(27.0) 1.83(31.0) 2.21(36.0)

3. Boiler house 0.52(8.7) 0.61(10.2) 0.67(11.2) 0.76(13.0)


4. Hydrocyclones 0.27(4.7) 0.34(5.9) 0.38(5.8) 0.45(6.5)


5. Combined flow
   (1+2+3)

2.25(36.0) 2.60(41.5) 2.85(45.0) .25(50.0)

Plant D
(Thailand)

1. Oil clarification
   room

0.89(6.1) 1.01(8.0) 1.09(9.2) 1.11(11.8)

2. Sterilizer
   building and oil
   clarification room

1.09(8.9) 1.21(10.5) 1.29(12.0) 1.39(13.0)

3. Miscellaneous
   sources

0.64(4.9) 0.80(5.9) 0.87(6.5) 1.00(7.8)

4. Combined flow
   (1+2+3)

1.73(13.8) 2.01(16.4) 2.16(18.5) 2.39(20.8)

*If a 50 percentile flow is used in the design of wastewater treatment facility, it means that 50% of

the time the flow of that particular waste stream will be equal or less than the stated figures.