# Earth:Population equivalent

Population equivalent or unit per capita loading, (PE), in waste-water treatment is the number expressing the ratio of the sum of the pollution load produced during 24 hours by industrial facilities and services to the individual pollution load in household sewage produced by one person in the same time.
For practical calculations, it is assumed that one unit equals to 54 grams of BOD per 24 hours.[1]

$PE =\dfrac{BOD\ load\ from\ industry\ \left [\dfrac{kg}{day}\right ]}{0.054\ \left [\dfrac{kg}{inhab \cdot day}\right ]}$
Population equivalents of wastewater from some industries[2]
Type Activity BOD PE

[inhab/(unit/d)]

Food Canning (fruit/vegetables) 500
Pea processing 85-400
Tomato 50-185
Carrot 160-390
Potato 215-545
Citrus fruit 55
Chicken meat 70-1600
Beef 20-600
Fish 300-2300
Sweets/candies 40-150
Sugar cane 50
Dairy (without cheese) 20-100
Dairy (with cheese) 100-800
Margarine 500
Slaughter house 10-100
Yeast production 21000
Confined animals breeding Pigs 35-100
Dairy cattle (milking room) 1-2
Cattle 65-150
Horses 65-150
Poultry 15-20
Sugar-alcohol Alcohol distillation 4000
Drinks Brewery 150-350
Soft drinks 50-100
Wine 5
Textiles Cotton 2800
Wool 5600
Rayon 550
Nylon 800
Polyester 3700
Wool washing 2000-4500
Dyeing 2000-3500
Textile bleaching 250-350
Leather and tanneries Tanning 1000-3500
Shoes 300
Pulp and paper Pulp 600
Paper 100-300
Pulp and paper integrated 1000-10000
Chemical industrial Paint 20
Soap 1000
Petroleum refinery 1
PVC 200
Steelworks Foundry 12-30
Lamination 8-50

## References

1. In Poland BOD5 of 1 person = 60g O2/day (Central Statistical Office, Poland )
2. Marcos von Sperling; Carlos Augusto de Lemos Chernicharo (2005). Biological wastewater treatment in warm climate regions, vol. 1. IWA Publishing. p. 72. ISBN 978-1-84339-002-2.

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