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Striebig et al Environmental Eng & Sust Design 2/e (Homework)

James Finch

Engineering, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 2 / 14

Due : Sunday, January 27, 2030 12:00 EST

Last Saved : n/a Saving...  ()

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Points
1 2 3 4 5 6 7 8 9 10
0/1 2/2 0/1 –/1 –/1 0/2 –/1 –/1 –/3 –/1
Total
2/14 (14.3%)

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1. 0/1 points  |  Previous Answers SOPHEnvEngSustDesign2 4.8.036. My Notes
Question Part
Points
Submissions Used
1
0/1
2/100
Total
0/1
 
  • This exercise will let students self-remediate with question-level help.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.

A completely mixed-flow reactor, with volume, V, and flow rate, Q, has a zero-order reaction, given below, where A is the material being produced and k is the rate constant.
dA
dt
 = k
Derive an equation that would allow for the direct calculation of the required reactor volume. (Use the following as necessary: A, A0, Q, and k.)
V =
Ao+AQk
Incorrect: Your answer is incorrect.

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2. 2/2 points  |  Previous Answers SOPHEnvEngSustDesign2 4.8.017. My Notes
Question Part
Points
Submissions Used
1 2
1/1 1/1
1/100 1/100
Total
2/2
 
  • This exercise will let students self-remediate with question-level help.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

A stream (see the figure and table below) flowing at 5 MGD with 50 mg/L suspended solids receives wastewater from three separate sources, A, B, and C.
A stream section with 219 L/s influent flow receives discharge from sources A, B, and C. A sampling point is downstream of the discharge points.
Source Quantity (MGD) Solids concentration (mg/L)
A 2 200
B 7 25
C 1 200
What are the flow (in MGD) and suspended solids concentration (in mg/L) downstream at the sampling point?
flow   Correct: Your answer is correct. MGD concentration   Correct: Your answer is correct. mg/L

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3. 0/1 points  |  Previous Answers SOPHEnvEngSustDesign2 4.7.032. My Notes
Question Part
Points
Submissions Used
1
0/1
1/100
Total
0/1
 
  • This exercise will let students self-remediate with question-level help.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

A settling tank has an influent rate of 0.5 MGD. It is 14 ft deep and has a surface area of 7,500 ft2. What is the hydraulic retention time (in days)?
Incorrect: Your answer is incorrect.
Your response differs from the correct answer by more than 10%. Double check your calculations. days

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4. –/1 points SOPHEnvEngSustDesign2 4.7.018. My Notes
Question Part
Points
Submissions Used
1
–/1
0/100
Total
–/1
 
  • This exercise will let students self-remediate with question-level help.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

An industrial flow of 12 L/min has a solids concentration of 83 mg/L. A solids removal process extracts 850 mg/min of the solids from the flow without affecting the liquid flow. What is the recovery (in percent)?
%

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5. –/1 points SOPHEnvEngSustDesign2 4.4.027. My Notes
Question Part
Points
Submissions Used
1
–/1
0/100
Total
–/1
 
  • This exercise will let students self-remediate with question-level help.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

A reaction of great social significance is the fermentation of sugar with yeast. This is a zero-order (in sugar) reaction, where the yeast is a catalyst (it does not enter the reaction itself). If a ½ L bottle contains 4 g of sugar and it takes 30 min to convert 50% of the sugar, what is the rate constant (in g/(L · min))?
g/(L · min)

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6. 0/2 points  |  Previous Answers SOPHEnvEngSustDesign2 4.3.021. My Notes
Question Part
Points
Submissions Used
1 2
0/1 0/1
1/100 1/100
Total
0/2
 
  • This exercise will let students self-remediate with question-level help.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

The Wrightsville Beach, North Carolina water treatment plant produces distilled water of zero salinity. To reduce the cost of water treatment and supply, the city mixes this desalinated water with untreated groundwater that has a salinity of 525 mg/L. If the desired drinking water is to have a salinity not exceeding 200 mg/L, how much of each water—untreated groundwater and distilled water— (in MGD) is needed to produce a finished water flow of 92 MGD?
untreated groundwater Incorrect: Your answer is incorrect.
Your response differs from the correct answer by more than 100%. MGD distilled water Incorrect: Your answer is incorrect.
Your response differs from the correct answer by more than 100%. MGD

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7. –/1 points SOPHEnvEngSustDesign2 4.3.003. My Notes
Question Part
Points
Submissions Used
1
–/1
0/100
Total
–/1
 
  • This exercise will let students self-remediate with question-level help.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

A power plant emits 47 kg of fly ash per hour up the smokestack. The flow rate of the hot gases in the stack is 3.0 m3/s. What is the concentration of the fly ash in micrograms per cubic meter?
µg/m3

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8. –/1 points SOPHEnvEngSustDesign2 4.1.012. My Notes
Question Part
Points
Submissions Used
1
–/1
0/100
Total
–/1
 
  • This exercise will let students self-remediate with question-level help.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

The Mother Goose Jam Factory makes jam by combining black currants and sugar at a weight ratio of 44:56. This mixture is heated to evaporate the water until the final jam contains one-third water. If the black currants originally contain 77% water, how many kilograms of berries are needed to make 2 kg of jam?
kg

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9. –/3 points SOPHEnvEngSustDesign2 4.1.009. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/100 0/100 0/100
Total
–/3
 
  • This exercise will let students self-remediate with question-level help.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

A capillary sludge drying system operates at a feed rate of 215 kg/hr and accepts a sludge with a solids content of 46% (54% water). The dried sludge is 92% solids (8% water), and the liquid stream contains 6% solids. What is the quantity of dried sludge (in L/hr)? (Assume the densities of sludge solids, sludge, and water = 1 kg/L. Note: this assumption can lead to significant error.)
L/hr
What are the liquid and solids flows in the liquid stream (in kg/hr)?
liquid flow kg/hr solids flow kg/hr

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10. –/1 points SOPHEnvEngSustDesign2 4.1.007. My Notes
Question Part
Points
Submissions Used
1
–/1
0/100
Total
–/1
 
  • This exercise will let students self-remediate with question-level help.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

Two flasks contain 35% and 65% by volume of formaldehyde, respectively. If 235 g from the first flask and 155 g from the second flask are mixed, what is the concentration (expressed as percent formaldehyde by volume) of the formaldehyde in the final mixture? (Assume the densities of formaldehyde, water, and the mixtures = 1 kg/L.)
%

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