2009-Homework 4.pdf
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CE 310 Introduction to Environmental Engineering Dept. of Civil and Environmental Engineering Southern Illinois University Carbondale Instructor: L.R. Chevalier, Ph.D., P.E., Professor Spring 2009 Homework 4: Due Monday, April 6 Textbook Problems (Based on 2 nd Edition 10 points each Streeter-Phelps Equation Use the following data from your previous homework problem River Q = 1.08 m 3 /s BOD u = 11.40 mg/L DO = 7.95 mg/L U = 0.39 m/s WWTP Q = 0.1507 m 3 /s Lo = 230 mg/L DO = 1.00 mg/L Use k r = 0.474/day and k d = 0.15/day Using either your spreadsheet from the previous homework, or the one provided on the course web site, evaluate the impact of changing the operating parameters of the WWT plant (DO or ultimate BOD). Take care to only increase or decrease to practical limits (e.g. do not increase DO above DO sat ). Present your results as a table and a graph. Submit electronically to [email protected] CMFR vs PFR Problem 4.31 2 nd Edition (3.21 1 st Edition) Hardness Problem 10.2 2 nd Edition (9.1 1 st Edition)
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Home Work 4
Transcript of 2009-Homework 4.pdf
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CE 310 Introduction to Environmental Engineering Dept. of Civil and Environmental Engineering Southern Illinois University Carbondale Instructor: L.R. Chevalier, Ph.D., P.E., Professor
Spring 2009 Homework 4: Due Monday, April 6 Textbook Problems (Based on 2nd Edition 10 points each
Streeter-Phelps Equation
Use the following data from your previous homework problem River Q = 1.08 m3/s BODu = 11.40 mg/L DO = 7.95 mg/L U = 0.39 m/s WWTP Q = 0.1507 m3/s Lo = 230 mg/L DO = 1.00 mg/L Use kr = 0.474/day and kd = 0.15/day Using either your spreadsheet from the previous homework, or the one provided on the course web site, evaluate the impact of changing the operating parameters of the WWT plant (DO or ultimate BOD). Take care to only increase or decrease to practical limits (e.g. do not increase DO above DOsat). Present your results as a table and a graph. Submit electronically to [email protected]
CMFR vs PFR
Problem 4.31 2nd Edition (3.21 1st Edition)
Hardness
Problem 10.2 2nd Edition (9.1 1st Edition)
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Type-2 Settling
A settling column analysis is run on a Type-2 suspension with the following results. (Entries are SS concentrations at the stated times). Determine the theoretical efficiency of a settling basin with a depth of 3.0 m and a detention time of 1.75 hrs
Time, min
Depth, m 0 30 60 90 120 150 180
0.5 240 134 81 50 38 31 21
1 240 180 122 96 67 52 43
1.5 240 205 149 112 94 72 53
2 240 215 168 129 107 92 63
2.5 240 221 175 143 130 112 83
3 240 232 191 157 137 118 97
