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The average flow velocity is 0.305 m/s. At the source, the BOD concentration is 10.0 mg/L...
The average flow velocity is 0.305 m/s. At the source, the BOD concentration is 10.0 mg/L and the dissolved oxygen deficit is 0.0 mg/L. From field sampling, de-oxygenation (kd) and re-aeration (ka) rate constants are estimated to be 0.6 d-1 and 2.0 d-1, respectively.
Find the critical distance, the critical deficit, and the time at which the minimum D.O. occurs
Solutions
Amanda K answered 2 years agoRelated Solutions
The ultimate BOD of a river just below a sewage outfall is 55.0 mg/L, and the...
The ultimate BOD of a river just below a sewage outfall is 55.0
mg/L, and the DO is at a saturation value of 12.0 mg/L. The
deoxygenation rate coefficient kd is 0.30/day, and the reaction
rate coefficient kr is 0.90/day. The river is flowing at the speed
if 52.0 miles per day. The only source of BOD on this river is this
single outfall.
Find the critical distance downstream at which DO is a
minimum.
Find the minimum DO.
If...
Calculate the pH of 0.305 L of a 0.17 M acetic acid - 0.28 M sodium...
Calculate the pH of 0.305 L of a 0.17 M acetic acid - 0.28 M
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0.0062 mol of HBr. Assume that the volume remains constant. (Ka of
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Express your answers using three significant figures separated
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A conventional activated-sludge plant treats 10.0 MGD of municipal wastewater with a BOD concentration of 240...
A conventional activated-sludge plant treats 10.0 MGD of
municipal wastewater with a BOD concentration of 240 mg/l and
suspended solids of 200 mg/l. The sludge flow pattern is shown in
Figure 11-1 of the textbook with a gravity belt thickener to
concentrate the excess activated sludge. Primary and thickened
activated sludge are pumped separately to the anaerobic digester.
The primary clarifier removes 50% of the suspended solids and 35%
of the BOD. The primary sludge solids content is 4.0%. The...
A conventional activated-sludge plant treats 10.0 MGD of municipal wastewater with a BOD concentration of 240...
A conventional activated-sludge plant treats 10.0 MGD of
municipal wastewater with a BOD concentration of 240 mg/l and
suspended solids of 200 mg/l. The sludge flow pattern is shown in
Figure 11-1 of the textbook with a gravity belt thickener to
concentrate the excess activated sludge. Primary and thickened
activated sludge are pumped separately to the anaerobic digester.
The primary clarifier removes 50% of the suspended solids and 35%
of the BOD. The primary sludge solids content is 4.0%. The...
An activated sludge plant receive 5.0 MGD of wastewater with a BOD of 220 mg/L. The...
An activated sludge plant receive 5.0 MGD of wastewater with a
BOD of 220 mg/L. The primary clarifier removes 35% of the BOD. The
sludge is aerated for 6 hr. The food-to-microorganism ratio is
0.30. The recirculation ratio is 0.2. The surface loading rate of
the secondary clarifier is 800 gal/day-ft2. The final effluent has
a BOD of 15 mg/L. What are the (a) BOD removal efficiency of the
activated sludge treatment processes (secondary BOD removal), (b)
aeration tank volume,...
Sulfate (SO4^2-) concentration is 10 mg SO4^2-/L and monohydrogen sulfide (HS-) concentration is 2 mg HS-/L....
Sulfate (SO4^2-) concentration is 10 mg SO4^2-/L and
monohydrogen sulfide (HS-) concentration is 2 mg HS-/L. What is the
total inorganic sulfur concentration in mg S/L?
Twelve samples of water from a particular source have an average lead concentration of 12.5μg/L with...
Twelve samples of water from a particular source have an
average lead concentration of 12.5μg/L with a standard deviation of
2.0μg/L. The 95% confidence interval for the lead concentration in
water from this source is approximately
An axial flow fan 1.83 m diameter is designed to run at a speed of 1400 rev/min with an average axial air velocity of 12.2 m/s
An axial flow fan 1.83 m diameter is designed to run at a speed of 1400 rev/min with an average axial air velocity of 12.2 m/s. A quarter scale model has been built to obtain a check on the design and the rotational speed of the model fan is 4200 rev/min. Determine the axial air velocity of the model so that dynamical similarity with the full-scale fan is preserved. The effects of Reynolds number change may be neglected. A sufficiently large...
A stream has a temperature of 20 degrees C, a velocity of 0.5 m/s, a flow...
A stream has a temperature of 20 degrees C, a velocity of 0.5
m/s, a flow rate of 3.0 m3/s, depth of 3.0 m, saturation
dissolved oxygen (DO = 9.07 mg/L), and BODu = 5 mg/L. Assume the
deoxygenation constant (k) = 0.24 d-1. Wastewater
discharge flows into the stream at 0.6 m3/s and
temperature of 20 degrees C, and the DO is 8.1 mg/L. The lowest DO
downstream is 4.0 mg/L and it occurs at a distance of 20...
if the concentration of Mg2+ in water is 36.6 mg/L, what is the hardness of the...
if
the concentration of Mg2+ in water is 36.6 mg/L, what is the
hardness of the water aa mg/L CaCO3?
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