The particles created at the conclusion of the rapid mix step associated with the alum addition in problem 2 have an average diameter of 20 µm and specific gravity of 2.0. During flocculation, the size increases to 75 µm, but the more open aggregate structure decreases the specific gravity to 1.9. The water temp is 18 °C. Calculate the settling velocity of both particles. How does the change in particle properties impact the settling velocity? Make sure to check the Reynolds Number.
The particles created at the conclusion of the rapid mix step associated with the alum addition in problem 2 have an average diameter of 20 µm and specific gravity of 2.0. During flocculation, the size increases to 75 µm, but the more open aggregate structure decreases the specific gravity to 1.9. The water temp is 18 °C. Calculate the settling velocity of both particles. How does the change in particle properties impact the settling velocity? Make sure to check the Reynolds Number.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
Need help with Question 3 PLEASE
Transcribed Image Text:1. Based on the following water composition, determine the alkalinity, total hardness and
carbonate hardness in units of mg/L CaCO3. (Note: you may want to refer back to our notes on
units and recall that CaCO3 has 2 eq/mol.)
lon
Conc. (mg/L)
MW (g/mol) Equiv.
Ca2+
30
Mg2+
10
Na
12
CI-
11
Alk (HCO₂) 110
40
24.3
23
35.5
61
Conc. (meq/l)
20
1.5
12.15 0.823
23
0.5217
35.5 0.30985
61
1.80327
Conc (mg/L as
CaCO3)
75
41.15
26.085
15.4925
90.1635
Transcribed Image Text:2. Jar testing conducted with the water described in problem 1 determined an optimum alum dose
of 20 mg/L for particle removal. Based on this alum dose, determine (a) the amount of natural
alkalinity (mg/L as CaCO3) consumed, (b) the amount of alkalinity remaining, and (c) the amount
of alum required (kg/yr) if the treated flow is 10 MGD.
3. The particles created at the conclusion of the rapid mix step associated with the alum addition
in problem 2 have an average diameter of 20 μm and specific gravity of 2.0. During flocculation,
the size increases to 75 µm, but the more open aggregate structure decreases the specific
gravity to 1.9. The water temp is 18 °C. Calculate the settling velocity of both particles. How
does the change in particle properties impact the settling velocity? Make sure to check the
Reynolds Number.
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!
Trending now
This is a popular solution!
Step by step
Solved in 3 steps
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.Recommended textbooks for you
Structural Analysis (10th Edition)
Civil Engineering
ISBN:
9780134610672
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Principles of Foundation Engineering (MindTap Cou…
Civil Engineering
ISBN:
9781337705028
Author:
Braja M. Das, Nagaratnam Sivakugan
Publisher:
Cengage Learning
Structural Analysis (10th Edition)
Civil Engineering
ISBN:
9780134610672
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Principles of Foundation Engineering (MindTap Cou…
Civil Engineering
ISBN:
9781337705028
Author:
Braja M. Das, Nagaratnam Sivakugan
Publisher:
Cengage Learning
Fundamentals of Structural Analysis
Civil Engineering
ISBN:
9780073398006
Author:
Kenneth M. Leet Emeritus, Chia-Ming Uang, Joel Lanning
Publisher:
McGraw-Hill Education
Traffic and Highway Engineering
Civil Engineering
ISBN:
9781305156241
Author:
Garber, Nicholas J.
Publisher:
Cengage Learning