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 ]}](../I/m/14dc566f1fa394169f8bc0734c2c4611.png)
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
- ↑ In Poland BOD5 of 1 person = 60g O2/day (Central Statistical Office, Poland)
- ↑ 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.