A house with seven (7) occupants located in a sub urban village used a septic tank to treat all their household wastes. Water supply used for cleansing is 160 L per person per day. The ambient temperature is not less than 25°C for most of the years. If the house practise the desludging every three (3) years and the suggested maximum sludge accumulation rates (S) is 40 L per person per year. (b) (i) Determine the volume of liquid entering the tank each day (ii) Volume of sludge and scum (iii) Total volume of the septic tank

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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A house with seven (7) occupants located in a sub urban village used a septic tank to
treat all their household wastes. Water supply used for cleansing is 160 L per person
per day. The ambient temperature is not less than 25°C for most of the years. If the
house practise the desludging every three (3) years and the suggested maximum sludge
accumulation rates (S) is 40 L per person per year.
(b)
(i)
Determine the volume of liquid entering the tank each day
(ii)
Volume of sludge and scum
(iii)
Total volume of the septic tank
Given:
A = P x q
B = P x N x F × S
Refer Table Q3(b)
Transcribed Image Text:A house with seven (7) occupants located in a sub urban village used a septic tank to treat all their household wastes. Water supply used for cleansing is 160 L per person per day. The ambient temperature is not less than 25°C for most of the years. If the house practise the desludging every three (3) years and the suggested maximum sludge accumulation rates (S) is 40 L per person per year. (b) (i) Determine the volume of liquid entering the tank each day (ii) Volume of sludge and scum (iii) Total volume of the septic tank Given: A = P x q B = P x N x F × S Refer Table Q3(b)
Table Q3 (b)
Value of F
Number of years
Ambient temperature
between
>20°C
>10°C
<10°C
desludging
throughout year
throughout
during winter
уear
1
1.3
1.5
2.5
1.0
1.15
1.5
1.0
1.0
1.27
4
1.0
1.0
1.15
1.0
1.0
1.06
6.
1.0
1.0
1.0
or more
Transcribed Image Text:Table Q3 (b) Value of F Number of years Ambient temperature between >20°C >10°C <10°C desludging throughout year throughout during winter уear 1 1.3 1.5 2.5 1.0 1.15 1.5 1.0 1.0 1.27 4 1.0 1.0 1.15 1.0 1.0 1.06 6. 1.0 1.0 1.0 or more
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