CE 326 Principles of Environmental Engineering
Problem Set No. 2
Due Date: Sept. 23.
Dr. S.K. Ong
1.
Solve Problem 3-5, (a) and (d) only, page 267
2.
Solve Problem 3-19, (a), (c) and (e) only, page 269
3.
Solve Problem 3-21, (a), (c) and (e) only, page 269
4.
Solve Problem 3-23, page 269
5.
Solve Problem 3-24, page 269
6.
Solve Problem 3-31, page 270
7.
A water has the following components. Nitrate (NO3-) = 10 mg of NO3-/L, Nitrite (NO2-)
= 2 mg of NO2-/L and ammonia (NH3) = 6 mg of NH3/L. Estimate the total nitrogen
concentration as mg of N/L in the water
8.
Solve Problem 3-61, page 276
(Mixer is Turbine, 6 flat blades (see Table 3-16), to select mixer model see Table in page
209)
9.
If you add the following chemicals to water (assuming that they dissolve completely),
indicate whether the hardness and alkalinity of water will increase, remain the same or
decrease:
Hardness
Alkalinity
Soda ash
Na2CO3
_________
__________
Table salt
NaCl
_________
__________
Gypsum
CaSO4
_________
__________
Lime
Ca(OH)2
_________
___________
Alum
Al2(SO4)3
_________
__________