Wastewater of 30ft3/s with a biochemical oxygen
demand (BOD) of 55mg/l, and dissolved oxygen (DO) of 3.3mg/l enters
a river where the flow is 125ft3/s with an ultimate BOD
of 7.0 mg/l, and DO of 6.8mg/l. The downstream has an average
velocity of 0.8ft/s.
i
Calculate the minimum DO level and its distance in miles downstream
using the oxygen sag equation. Assume k1 = 0.046 per day
and k2 = 0.304 per day. The saturation DO = 8.5mg/l. (1
mile...
Biochemical oxygen demand i.e. BOD) is a measure of the
potential damage that can be done to the dissolved oxygen content
of a body of water by organic waste. A BOD is also the amount of
O2required to degrade or
decompose the wastes. Its name comes from the "demand" that organic
carbon has for O2 through biochemical (enzyme)
oxidation.
BOD – demanded oxygen – can be likened to a debt that must be
paid. Dissolved oxygen (DO) can be thought...
A study to assess the capability of subsurface flow wetland
systems to remove biochemical oxygen demand (BOD) and various other
chemical constituents resulted in the accompanying data on x = BOD
mass loading and y = BOD mass removal.
x = BOD 30 35 37 38 44 103
y = BOD 26 21 9 31 30 75
a)Obtain the estimated ?0 and ?̂1 coefficients. (4 pts.) Show
your calculations.
b)Write the linear regression equation.
c)Calculate the coefficient of determination (?^2)...
A study to assess the capability of subsurface flow wetland
systems to remove biochemical oxygen demand (BOD) and various other
chemical constituents resulted in the accompanying data on x = BOD
mass loading and y = BOD mass removal.
x =BOD mass loading 8 10 11 13 16 27
y = BOD mass removal 7 8 8 10 27 16
a)Obtain the estimated ??̂0 and ??̂1 coefficients. (4 pts.) Show
your calculations.
b)Write the linear regression equation. (2 pts.)
c)Calculate...
1. How does the consumer choice work and how does it effect
supply and demand.
2. If the average product price is declining, how does that
impact the production and cost?
3. Does perfect competition work? What is an example where it
does not work?