SOLUTIONS TO EXERCISES, LESSON 1
1.
c
2.
b
3.
99.9
4.
5.
septic
6.
b
7.
8.
a.
Collection.
b.
Transportation.
c.
Treatment.
d.
9.
c
10. d
e
g
Sedimentation and sludge removal are physical processes and a basic part of
primary treatment; however, they are also employed in conjunction with
secondary processes (secondary settling following filtration or aeration).
11. tertiary
12. 99.5
13. a
b
The settling of solids in primary; the sludge digestion is secondary.
14. a
b
The ground water table should be at least 4 feet below the bottom of
absorption trenches (para 1-13a). Soil absorption systems may be adapted
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