How big is the septic tank in a 50-room hotel?

The volume of septic tank should be determined according to the number of users, the fermentation and decomposition time of feces, and the sterilization requirements of egg sinking. The commonly used calculation parameter in China is the amount of feces discharged per person per day, including a small amount of water for flushing toilets, which is calculated as 3.5 kg (minimum amount), and the fermentation decomposition time of feces and pathogen disability time are calculated as 30 days, in which the first pool needs to stay for 20 days and the second pool needs to stay for 10 days. The volumes of the first tank and the second tank are calculated according to this retention time, and the volume of the third tank is generally the sum of the volumes of the first tank and the second tank. The calculation formula of septic tank volume is as follows:

Septic tank volume = (fecal output/day × number of users × day)/1000

For example, in a family of four, the discharge of urine and feces is 3.5kg/ day/person, and the feces are stored and fermented for 30 days, so as to find the effective volume of the first and second tanks.

The effective volume of the first tank = 3.5x4x20/ 1000 = 0.28 cubic meters.

The effective volume of the second tank = 3.5x4x101000 = 0.14 cubic meter.

The third pool is the sum of 1-2 pools, which is 0.42 cubic meters.

Considering the cleaning times of toilets, the actual water consumption is inconvenient to master and the construction is convenient. The volume of septic tanks is more than 15-25% higher than the calculated results.

50 people, the discharge of urine and feces/day/person, calculated as 3.5kg, and the storage and fermentation time of feces is 30 days, so as to find the effective volume of the first and second tanks.

The effective volume of the first tank = 3.5x50x20/ 1000 = 3.5 cubic meters.

The effective volume of the second tank = 3.5x50x10/1000 =1.75m3.

The third pool is the sum of 1-2 pools, which is 5.25 cubic meters.