You are investigating the water quality of a river with an average velocity of 30 m/min and a sewage discharge which impacts the dissolved oxygen in the river. It is linear and regular for a length of 100 miles, except there is a small waterfall 10 miles downstream of discharge. At the waterfall, the oxygen deficit falls back to zero. The load to the river is 20 mg/L. The de-oxygenation rate coefficient (kj) is 0.3 day and the re-aeration rate coefficient (k,) is 0.5 day'. If the initial oxygen deficit is 0 mg/L and oxygen saturation is 8 mg/L, what is the minimum concentration seen in the river?

You are investigating the water quality of a river with an average velocity of 30 m/min and a sewage discharge which impacts the dissolved oxygen in the river. It is linear and regular for a length of 100 miles, except there is a small waterfall 10 miles downstream of discharge. At the waterfall, the oxygen deficit falls back to zero. The load to the river is 20 mg/L. The de-oxygenation rate coefficient (kj) is 0.3 day and the re-aeration rate coefficient (k,) is 0.5 day'. If the initial oxygen deficit is 0 mg/L and oxygen saturation is 8 mg/L, what is the minimum concentration seen in the river?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Related questions

Q: 4. Determine the Theoretical Oxygen Demand (ThOD) of a solution that contains 28 mg of Nerolidol,…

A: A solution that contains 28 mg of Nerolidol and To determine:the theoretical oxygen demand (ThOD) of…

Q: Dissolved chloride in a concentration of 500 mg/L is being advected with flowing groundwater at a…

Q: A sewage sludge is to be transported a distance of 3 mi through a 12in ID pipeline at a rate of 2000…

A: Given data : Distance = 3 miles Internal diameter= 12 inch Rate = 2000 GPM Yield stress= 35 dyne/cm2…

Q: A municipal wastewater flow of 1,000 m³/d contains 400 mg/L BOD5 and is treated to be in a trickling…

Q: In a certain situation, waste water having dissolved oxygen of 2.36 mg/lt is discharged at 1.25…

Q: The facultative pond at USM's sewage treatment plant is designed with the following data; Aerial…

Q: A river with a flowrate (Q) of 850 cfs (cubic feet per second) has a total dissolved solids (TDS,…

A: Given, Flow rate of river, Q = 850 cfc= 850 ft3/sec TDS of river, say C =55 mg/L TDS of discharge…

Q: Assume the described is at steady state. A fluid goes up to an aquifer that has groundwater and a…

A: Volume of groundwater reservoir, Outflow, Chloride Concentration of fluid, Chloride outflow,

Q: A creek is flowing at an average rate of 0.4 m^3/s. A corporation is importing 30% of the creek…

Q: Answer fast

A: Step 1: The approximate alkalinity of the water sample in mg/L as CaCO3 can be calculated from the…

Q: 4. (Modified from problem in an FE Review Book) A municipal wastewater treatment plant is…

A: Given Data:Ultimate BOD of Mix L=8.2mg/l.Initial D.O Deficit =2.4mg/lSaturation…

Q: A wastewater treatment plant must disinfect its effluent before discharging the wastewater to a…

A: Given data: Initial concentration of California colony (Co) = 5.5 x 105 CFU/L. Maximum California…

Q: A stream containing no biochemical O2 demand (obviously a hypothetical situation) has a DO of 5.00…

A: Given DO = 5.00mg/l Flow Rate = 8.7m3/s Temperature = 15oC Avg Velocity = 0.174 m/s Avg Depth =…

Q: The stream shown below has a flow of 28,000 m³/d, and a cross-sectional area of 35 m². The stream is…

A: k1=0.18/day for BOD assimilation in the riverk3=0.01/day for BOD sedimentation in the…

Q: Three streams are mixing at a junction. The flow rate and total dissolved solids (TDS, a…

Q: A wastewater treatment plant discharges an effluent containing 2 mg/L of dissolved oxygen to a river…

Q: A 0.5 ppm concentration of copper sulfate is to be applied to a lake to control the growth of algae.…

A: The copper sulfate of both forms granulated and pulverized is used to control the algae. This…

Q: bread and breakfast facility is considering an ion exchange resī ndwater. The flow required is 1000…

A: Efficiency of the reaction :E=325-50325=85.62%so,

Q: A small industrial plant discharges wastewater into a stream. The plant discharge has a flow rate of…

A: It is the amount of oxygen required by micro organisms to decompose organic matter under aerobic…

Q: A river before its entry into a town had a discharge of 200 litres per second and 30 mg/las the…

A: Discharge = 200 l/sconcentration = 30 mg/lwastewater discharge = 250 mg/lconcentration = 75 mg/lTo…

Q: 2. A lake has a volume of 9 million m³ and an average depth of 3 m. There is an influent stream…

Q: A bottle is filled with river water. The initial dissolved oxygen concentration is 10.2 mg/L.…

A: Given: The initial dissolved oxygen concentration = 10.2 mg/L. After 5 days ,the dissolved oxygen…

Q: The herbicide atrazine is accidentally spilled into a river, resulting in 80 μg/L atrazine…

A: Solution:- Time taken by chemical to reach drinking water intake given by t= distance/velocity .…

Q: A municipal wastewater treatment plant processes an average flow of 5000 m³/d. A primary clarifier…

A: Average flow Q=5000 m3/dEfficiency of primary clarifier=60% at average flow.To Find-The value of…

Q: in the carrying 2,000 mg/L of salts. The salts quickly become uniformly distrib river. A…

Concept explainers

Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.

Question

You are investigating the water quality of a
river with an average velocity of 30 m/min
and a sewage discharge which impacts the
dissolved oxygen in the river. It is linear
and regular for a length of 100 miles,
except there is a small waterfall 10 miles
downstream of discharge. At the waterfall,
the oxygen deficit falls back to zero. The
load to the river is 20 mg/L. The
de-oxygenation rate coefficient (kj) is 0.3
day' and the re-aeration rate coefficient
(k.) is 0.5 day'. If the initial oxygen deficit
is 0 mg/L and oxygen saturation is 8 mg/L,
what is the minimum concentration seen in
the river?
Answer: 2.78 mg/L

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 2 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.

Similar questions

An anaerobic digester (AD) is designed with the following data. Organic loading rate 1.0 kg VSS/m³.day VSS load 120 kg/day (i). (ii). Estimate the volume of the AD. If the VSS is 12 kg/m³, estimate the retention time.
Flow rate: 1.5 m3/s Pollution: pesticide permethrin Lake size: 100m x100m x 2.5m Steady state concentration of permethrin leaving the lake is 1.4 ppm Average cross-sectional area of the river is 2.7 m2. Half-life of permethrin in this environment is 19 hrs. What is the concentration of permethrin entering the lake and what distance downstream of the outlet would the concentration be less than 1 ppm?
A river receives a discharge of 10MGD at a concentration of 150mg/l. The river flow upstream is 20MGD at zero concentration. For 15 mi downstream, the pollutant decay according to the equation C=Co e -0.1x where x is in mile and c is concentration. A region of slow moving is then encountered where the velocity concentration at the point 35mi downstream from the outfall ? drops, what is the
All information given... Don't say incomplete question
A city wishes to discharge wastewater primary effluent to a river which supports a trout. The state requires the city to show that the trout population is protected. Trout require a minimum of 4 mg/l of dissolved oxygen to survive. Determine the minimum downstream dissolved oxygen concentration from the following information about the wastewater discharge and river. Does the minimum dissolved oxygen concentration meet the requirements? Wastewater discharge=0.45m3/s, river flow rate= 8.5 m3/s, river cross-sectional area=19m2, dissolved Oxygen concentration in the wastewater= 0.2mg/l, dissolved oxygen content of the river upstream = 8.1mg/l, saturation dissolved oxygen concentration at 20 C= 9.0 mg/l, BOD concentration in wastewater = 85 mg/l, BOD concentration upstream in the river= 0.2 mg/l, BOD decay constant = 0.2 d-1, and the reaeration constant for the river= 0.4 d-1.
A clean river flows at a rate of 10 cfs. A discharge pipe containing 100 mg/L of nitrate empties into the river at a flow rate of 10 L/s. Assume nitrate naturally degrades at a rate of 0.1/min (first order kinetics). What is the nitrate concentration (mg/L) just downstream of the discharge point?
The lowest flow in the Ozama River in July is about 48 m3/s. The dissolved oxygen concentration of the river just upstream of the discharge point is 4 mg/l and the ultimate BOD of the river is 10 mg/l. A farm discharges 2m3/s of untreated wastewater with a dissolved oxygen concentration of 0.5 mg/l and an ultimate BOD of 300 mg/l. Both the river and the discharge are at 25°C. what is the initial oxygen deficiency after mixing (i.e., as soon as the wastewater and the river have mixed)? What is the ultimate initial BOD after mixing? Can the farm be allowed to continue discharging raw water? Justify your answer.
The town of Viracocha discharges 17,360 m³/day of treated wastewater into the Pachacamac Creek. The treated wastewater has a BOD5 of 12 mg/L and a BOD decay constant, k, of 0.12/day at 10 °C. Pachacamac Creek has a flow rate of 0.43 m³/s and an ultimate BOD, Lo, of 5 mg/L. The DO of the river is 6.5 mg/L and the DO of the wastewater is 1.0 mg/L. Compute the DO and the initial ultimate BOD, Lo, after mixing. Draw the Mass Balance Diagram.
The density of water at 4°C is 1000 kg/m3 at atmosphericpressure. The gravity acceleration constant (g) is 9.81 m/s2. Thespecific gravity of an industrial wastewater (SGww) is 1.32. Whatis the specific weight of this wastewater?
You are constructing a sewage lagoon with a 3,100 m3/day inlet/outlet flow rate. You must attain a BOD outflow load of 12 mg/L given a BOD inlet load of 26 mg/L. BOD has a half-life of 2.4 days.What volume is needed for the lagoon and how long would it take for the output BOD concentration to reach 1 ppm if freshwater started to replace the wastewater that was previously entering the lagoon?