Cálculo de Autodepuração: Método de Streeter-Phelps

Input data

Flow

Cross section area

River length

Upstream BOD

Upstream dissolved oxygen

Temperature

Deoxygenation constant

Reaeration constant

Output data

Downstream dissolved oxygen

Downstream BOD

Critical dissolved oxygen concentration

Critical length

Curves

Description

River Self-Purification: Streeter-Phelps Method

Performs a self-purification calculation using the Streeter-Phelps model, which simulates the oxygen dynamics and BOD (Biochemical Oxygen Demand) in a river. This method calculates the degradation of organic matter and the oxygen replenishment through reaeration over a specific river length, helping in assessing water quality.

Input Parameters

Parameter
Default Units
Description
Flow
m3/sm^3/s
Water flow rate
Cross section area
m2m^2
Cross-sectional area of the river
River length
km
Length of the river
Upstream BOD
mg/L
Biochemical oxygen demand at upstream
Upstream dissolved oxygen
mg/L
Dissolved oxygen concentration upstream
Temperature
°C
Water temperature (default: 20°C)
Deoxygenation constant
d1d^{-1}
Rate of oxygen consumption
Reaeration constant
d1d^{-1}
Rate of oxygen replenishment

Output Parameters

Parameter
Default Units
Description
Flow
m3/sm^3/s
Output water flow rate
Downstream dissolved oxygen
mg/L
Oxygen concentration at the downstream point
Downstream BOD
mg/L
BOD at the downstream point
Critical dissolved oxygen concentration
mg/L
Minimum dissolved oxygen concentration
Critical length
km
River length where oxygen reaches a minimum
Concentrations table
-
Table of dissolved oxygen along the river

References

  • Streeter H. W., Phelps E. B., 1925, A Study of the pollution and natural purification of the Ohio river. III. Factors concerned in the phenomena of oxidation and reaeration, Public Health Bulletin no. 146, Reprinted by U.S. Department of Health, Education and Welfare, Public Health Service, 1958