25 Jun MEM 6920 ENVIRONMENTAL ENGINEERING HOMEWORK # 4 Water Treatment
uestion
MEM 6920 ENVIRONMENTAL ENGINEERING
HOMEWORK # 4
Water Treatment
The water treatment plant for a mixed industrial-commercial-residential city of
100,000 people is supplied by a river intake.
The actual plant configuration consists of three parallel sets of one
coagulation/flocculator tank, one sedimentation tank followed by four rapid filter
boxes (See Figure 1).
Normally, the turbidity of the water is 50 Turbidity Units (TU). Three or four times a
year heavy rains cause the turbidity to increase to 500 TU. In addition, the sewage
treatment plant of a nearby upstream town in known to release partially treated
sewage at these times because of the high rate of stormwater runoff flowing through
the combined stormwater and sewage lines feeding the plant. In its present
configuration the plant cannot provide the required quality of drinking water during
these periods and the citizens have begun to complain.
Discuss the strategies open to you as the waterworks engineer for the town (at least
two possible solutions). Provide conceptual solutions, no design involved.
Flow
Figure 1. Configuration of the Existing Water Treatment Plant
POLYTECHNIC UNIVERSITY OF PUERTO RICO AURISTELA MUESES
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