Description

Given the number and type of contributors and the temperature of the effluent to be treated, calculates the volume of the filtering medium.

Table 1 - Daily contribution of waste and organic load by type of building and occupants

Building	Unit	Sewage contribution L/d	Organic load contribution L/d $gBOD_{5.20}$/d
Permanent occupants
Residence
High standard	Person	160	50
Average standard	Person	130	45
Low standard	Person	100	40
Hotel (except laundry and kitchen)	Person	100	30
Temporary accommodation	Person	80	30
Temporary occupants
Factory in general	Person	70	25
Office	Person	50	25
Public or commercial building	Person	50	25
Schools (day schools) and long-term places	Person	50	20
Bars	Person	6	6
Restaurants and similar	Person	25	25
Cinemas, theaters and short-stay places	Person	2	1
Public restrooms	Sanitary basin	480	120

Table 2 - Sewage hydraulic detention time (t), by flow range and sewage temperature (in days)

Flow (L/day)	Average temperature of the coldest month
	Below 15°C	Between 15°C and 25°C	Greater than 25°C
Up to 1,500 1.17	1	0.92
From 1,501 to 3,000	1.08	0.92	0.83
From 3,001 to 4,500	1	0.83	0.75
From 4,501 to 6,000	0.92	0.75	0.67
From 6,001 to 7,500	0.83	0.67	0.58
From 7,501 to 9,000	0.75	0.58	0.5
Above 9,000	0.75	0.5	0.5

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