= A waste stabilization pond is used to treat a dilute municipal wastewater before the liquid is discharged into a river. The inflow to the pond has a flow rate of Q = 4,000 m³/day and a BOD¹ concentration of Cin 25 mg/L. The volume of the pond is 20,000 m³. The purpose of the pond is to allow time for the decay of BOD to occur before discharge into the environment. BOD decays in the pond with a first-order rate constant equal to 0.25/day. What is the BOD concentration at the outflow of the pond, in units of mg/L? =

= A waste stabilization pond is used to treat a dilute municipal wastewater before the liquid is discharged into a river. The inflow to the pond has a flow rate of Q = 4,000 m³/day and a BOD¹ concentration of Cin 25 mg/L. The volume of the pond is 20,000 m³. The purpose of the pond is to allow time for the decay of BOD to occur before discharge into the environment. BOD decays in the pond with a first-order rate constant equal to 0.25/day. What is the BOD concentration at the outflow of the pond, in units of mg/L? =

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.

Question

100%

A waste stabilization pond is used to treat a dilute municipal wastewater before
the liquid is discharged into a river. The inflow to the pond has a flow rate of Q
4,000
m³/day and a BOD¹ concentration of Cin 25 mg/L. The volume of the pond is 20,000 m³.
The purpose of the pond is to allow time for the decay of BOD to occur before discharge into
the environment. BOD decays in the pond with a first-order rate constant equal to 0.25/day.
What is the BOD concentration at the outflow of the pond, in units of mg/L?
=
=

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