Problem 8 Given L0,mix=12 mg/L, DO mix=DOsat=11.33 mg/L, kd=0.3 d-1, and kr =0.4 d-1, find the following: (a) Initial oxygen deficit (Do) (b) Critical time on the oxygen sag curve (tc) (c) Critical deficit (Dc)

Problem 8 Given L0,mix=12 mg/L, DO mix=DOsat=11.33 mg/L, kd=0.3 d-1, and kr =0.4 d-1, find the following: (a) Initial oxygen deficit (Do) (b) Critical time on the oxygen sag curve (tc) (c) Critical deficit (Dc)

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: ug/L of NaOH should be added in water to change the pH from 7 to 9 at 25°C.

Q: Help solve both of these for my homework. Please

A: Q5Q6

Q: unfiltered water supply is disınfected with an applied chlorine dose of 2 mg/L as Cl. The ak hourly…

A: Given: Chlorine = 2 mh/l Discharge=0.05m3s =0.05×3600…

Q: Small droplets of carbon tetrachloride at 68 °F are formed with a spray nozzle. If the average…

A: Given: Temperature of carbon tetrachloride = 68°F Avg. diameter = 230 µm = 230*10-6 m Required:…

Q: water goes through the water cycle again and again, the amount of water on Eart A- Increases. C-…

A: 1. C stays the same 2. A Decreases with higher altitudes 3. D Rainfall 4. C Evaporation,…

Q: QUESTION FIVE Calculate the efficient substrate concentration, the thickening ratio and the purge…

A: Since Xi=0, we assume the effective thickening ratio is not applicable as the system does not…

Q: Use the psychrometric chart for the following questions unless asked to “calculate”, in which case…

A: At intersection point, the inclined line slope more than the specific enthalpy lines shows the…

Q: Convert the concentration of SO2 from 80 pg m temperature of 25°C and a pressure of 101.325 kPa. to…

A: ppm = Conversions are needed to calculate the volume of So2 in cubic meters.

Q: Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a…

Q: completely mixed activated sludge reactor treating municipal wastewater, we can assume the following…

Q: 4. What does the analytical scale read? (Ans: 1.550 g) 5. What is the concentration of the Total…

A: Given, Flow rate (Q) = 20 mgd Volume (V) = 90 ml or 0.09 L

Q: Glycerin (specific gravity 1.26) in a processing plant flows in a pipe at a rate of 805 L/s. At a…

A: Given data:

Q: Some wastewater has a BOD, of 180 mg/L at 20°C. The reaction rate K at that temperature has heen…

Q: Convert the following from milligrams per liter as the ion or compound to milligrams per liter as…

A: Concentration in mg/L are given. We need to calculate concntration as mg/L CaCO3

Q: Given: Water flows through a nozzle, at section 2, the nozzle discharges to atmosphere. 2 10 V Find:…

Q: The initial concentration of acetic acid is 0.6mM and its concetration is 0.42mM after adsorption…

Q: In a biological wastewater treatment system, which of the following conditions could be considered…

A: Anoxic conditions refer to which conditions in molecular oxygen is absent, which means electron…

Q: A 1,200 gpm WTP is being designed for treating iron and manganese. The influent manganese…

A: Given manganese concentration = 80mg/l Iron concentration = 90mg/l 0.1432 mg/l of oxygen is…

Q: The total mercury concentration in the San Francisco Bay Area is reported to be 2.1 mg/m3 in air.…

A: Given that: Total Mercury concentration = 21mg/m3

Q: 3. Compute the formula weight and density of exhaust gas which contains 72% N2, 1% Ar, 12% H2O, and…

Question

Problem 8
Given L0,mix=12 mg/L, DO mix=DOsat=11.33 mg/L, kd=0.3 d-1, and kr =0.4 d-1,
find the following:
(a) Initial oxygen deficit (Do)
(b) Critical time on the oxygen sag curve (tc)
(c) Critical deficit (Dc)

Expert Solution

This question has been solved!

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

SEE SOLUTION Check out a sample Q&A here

Step 1: State the given data

VIEW

Step 2: Determine the initial oxygen deficit and critical time

VIEW

Step 3: Determine the critical deficit

VIEW

Solution

VIEW

Step by step

Solved in 4 steps with 2 images

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

4. Problem 5-16 (modified), Davis and Cornwell, Introduction to Environmental Engineering, 5th Ed.: Determine the concentration (mol/L) of hydroxide that must be added to an aqueous solution to produce a concentration of 0.50 mg/L copper if the starting concentration is 3.5 mg/L copper. The solubility product for copper hydroxide (Cu(OH)2) is 2.2 x 10-20 mol/L. What is the resulting solution pH?
Envt.
Calculate the BOD concentration based on the data below. DOinitial (mg/L) 7 DO final (mg/L 3.5 Vol. sample (ml) 15 Vol. dilution (ml) 285 BOD (mg/L) ?
Problem 2 -50 A glass 12 cm tall filled with water is inverted. The bottom is open. What is pressure at the closed end? Barometric pressure is 101.325 kPa. the Ans: 100.15 kPaa Problem 2 -51 In Figure 13, in which fluid will a pressure of 700 kPa first be achieved? Ans: glycerin Po = 90 kPa ethyl alcohol p= 773.3 kg/m 60 m oil p= 899.6 kg/m? 10 m water p = 979 kg/m glycerin p = 1236 kg/m 5 m 5 m
The recommended threshold limit value (TLV-ACGIH) air concentration for occupational exposure to water-insoluble hexavalent chromium Cr (VI) is 0.01 mg/M3. This concentration assumes that the individual is generally healthy and is exposed for 8 hours per day 5 days per week (40 hour work week) over a working lifetime (that is from age 18 to 65 years). Assuming a body weight of 75 kg and an inhalation rate of 0.85 m3/h over the working life of the individual, a. What is the lifetime (75 y) CDI? b. Estimate the low-dose cancer risk from occupational inhalation exposure to hexavalent chromium Cr(VI).
Part d
What is the pH of a solution made by dissolving 3.71 grams of calcium fluoride in enough water to make 450 mL of solution? The Ka for HF is 6.8x10-4.
Note:hand written solution should be avoided.
Number 15. complete solution and box final answer
vated sludge. 12.61 A step-aeration activated-sludge system at a loading of 40 lb of BOD/1000 ft³/day requires an air supply of 1200 ft/lb of BOD applied to maintain an adequate dissolved-oxygen level. The measured average oxygen utilization of the mixed liquor is 36 mg/1/hr. Calculate the oxygen transfer efficiency. (Assume 0.0174 lb of oxygen per cubic foot of air, which is the amount at 20°C and 760 mm pressure.) 12.62 An air sunnly
The sulfur dioxide (SO 2 ) stack gas concentration from fossil fuel combustion is 2 ppmv. Determine the stack gas SO2 concentration in units of ug/m 3 . Assume 0°C and 1 atm pressure.
True/False questions. 1 For filtration process: when the water level rises to the point that the filter bed must be cleaned. This point is called terminal head loss ( 2 As the temperature decreases the detention time in 7 slow-mix tank decreases. ( 6 8 When CO₂ is bubbled in water with carbonate buffer system, the pH will decrease slightly and the reaction will shift to the left. ( ) 9 The lower the water turbidity, the higher the allowable ) scour velocity in sedimentation tank.( For mixed-media filter the layer of garnet is used to catch the very fine particles ( 3 The addition of polymers in coagulation process is called inter-particle bridging. ( ) ) 4 Slow-mixing can be accomplished by hydraulic As the weir lengths become shorter the scouring velocity becomes higher ( jump ( ) ) 5 Water with high turbidity requires more coagulant 10 Aluminum sulfate has a wider pH range for effective to be treated. ( coagulation than fèrric salts ( )