24. What is the normal method for disposing of supernatant liquor?
_____________________________
25. The most important factor in sludge disposal is:
a.
Ensuring that the sludge is well digested.
b.
Adequate area for drying beds.
c.
A favorable climate (humidity).
d.
Sufficient underdrain for proper dewatering.
26. The expected result in properly control led postchlorination of plant effluent is the:
a.
Removal of all BOD.
b.
Complete sterilization.
c.
Reduction of the bacterial content by approximately 99.5 percent.
d.
Imparting of a residual which will preserve the potability of the receiving
stream.
27. _____________ is sometimes added at the plant inlet to prevent septic conditions
and to prevent odors.
28. An advantage of the stabilization ponds is:
a.
Simplicity.
b.
Freedom from maintenance.
c.
Freedom from insect pests.
d.
Freedom from objectionable odors.
MD0161
2-61