Question

A clarifier operates with a surface loading of 20,000 L/m²-d. What is the slowest settling velocity of particles that will be completely removed in the tank?

Answer #1

A completely mixed activated sludge process is designed to treat
20,000 m3 /d of domestic wastewater having a BOD5 concentration of
250 mg/L following primary treatment. The NPDES permit requirement
for effluent BOD5 and TSS is 20 mg/L for each. The biokinetic
parameters have been established as: yield = 0.6 , k = 5/d, Ks = 60
mg/L, and kd = 0.06/d. The MLVSS concentration in the aeration tank
is to be maintained at 3000 mg/L and the ratio of...

What is the sedimentation velocity (in m/s) of a 250 µm diameter
spherical particle with a density of 1.2 g/cm3 in water at 15°C? b.
To remove 80% of such particles, what an overflow rate (in m/s) is
needed in a sedimentation tank? c. If the tank is an up-flow
clarifier (round shape from a top view) with a diameter: depth
ratio of 3:1, and the flow to be treated is 100 cfs, what are the
diameter (in m), depth...

A
black mass m and velocity v slides horizontally on a surface a
distance d. What is m (mue)

An earthquake generates three types of waves: surface waves (L
waves), which are the slowest and weakest; cutting waves (S waves),
which are transverse waves and carry most of the energies, and
pressure waves (P waves), which are longitudinal waves that move
faster. The speed of the P waves is approximately 7.0 km / s, and
that of the S waves is approximately 4.0 km-7s. It seems that
animals feel the waves P. If a dog feels the arrival of...

In Freedonia the real demand for money is d = (M/P)d
= L(i,Y) = Y/(5i1/3 ), i being the nominal interest
rate.
(a) What is the income velocity of money in Freedonia?
(b) Suppose output is growing at the annual rate of g. What is
the growth rate of real money demand?
(c) If the nominal interest rate is constant, what is the growth
rate of velocity?
(d) Suppose at time 1 there is a permanent increase in i. What...

Consider an economy in which the money demand function takes the
form:
(M/P) d = L (i, Y) = Y/(5i)
a. If output grows at rate g, at what rate will the demand for
real balances grow (assuming constant nominal interest rates)?
b. What is the velocity of money in this economy?
c. If inflation and nominal interest rates are constant, at what
rate, if any, will velocity grow?
d. How will a permanent (once-and-for-all) increase in the level
of...

In Freedonia the real demand for money is L = (M/P)d
= kY, k a constant. The money supply is growing at 12% per year and
real income, Y, is growing at 4% per year.
(a) What is the income velocity of money in Freedonia?
(b) What is Freedonia’s annual inflation rate?
(c) Suppose the income velocity of money is growing at the rate
of 1%. What is Freedonia’s annual rate of inflation.

Suppose that the money demand function takes the form
(M/P)d = L (i, Y) = Y/(5i)
a. If output grows at rate g and the nominal interest rate is
constant, at what rate will the demand for real balances grow?
b. What is the velocity of money in this economy?
c. If inflation and nominal interest rates are constant, at what
rate, if any, will velocity grow?
d. How will a permanent (once-and-for-all) increase in the level
of interest rates...

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