INTRODUCTION TO ENVIRONMENTAL ENGINEERING 32502

1
INTRODUCTION TO ENVIRONMENTAL
ENGINEERING3/25/02
2
Chapter 4 - Water Quality Management
4-3 Water Quality Management in Rivers Effect of
Oxygen-Demanding Wastes on Rivers Biochemical
Oxygen Demand (BOD) Figure 4-1, p. 290 BODt
Lo(1 - e-kt) Chemical Oxygen Demand (COD) BOD5
lab test versus in-situ (real situation) CBOD5
(inhibition of nitrification)
3
Chapter 4 - Water Quality Management
4-3 Water Quality Management in Rivers DO Sag
Curve Figure 4-7, p. 303 anaerobic vs. aerobic
decomposition benthic oxygen demand from
sediments Figure 4-8 Oxygen sag downstream
4
Chapter 4 - Water Quality Management
4-3 Water Quality Management in Rivers dD kdL
- krD EQ 4-39, p. 309 dt dD change in
oxygen deficit (D) per unit time, (mg/L)/d dt kd
deoxygenation rate constant, d-1 L ultimate
BOD of river water, mg/L kr reaeration rate
constant, d -1 D oxygen deficit in river
water, mg/L
5
Chapter 4 - Water Quality Management
DO Sag Equation D kdLa (e-kdt - e-krt)
Da(e-krt) kr - kd D oxygen deficit in
river water after exertion of BOD for
time, t, mg/L La initial ultimate BOD of river
water and wastewater have mixed (EQ
4-25, p. 305), mg/L kd deoxygenation rate
constant, d-1 kr reaeration rate constant, d
-1 Da initial oxygen deficit after river and
wastewater have mixed (EQ 4-31, p.
307), mg/L
6
Chapter 4 - Water Quality Management
4-4 Water Quality Management in
Lakes Stratification and Turnover Figure 4-12,
p. 321 Epilimnion, Thermocline, and Hypolimnion
layers Lake Productivity Eutrophication of the
Great Lakes GLI, and control of
phosphorus Acidification of lakes control of
sulfur and nitrogen oxides