Civil Engineering Reference
In-Depth Information
TABLE 30-2. Distribution of Energy by Process in Water Treatment Plants (5 to 200 mgd)
Energy at Listed Plant Capacity (kWh / year)
Process
5 mgd
10 mgd
50 mgd
100 mgd
200 mgd
Raw-water pumping
356,250
712,500
3,562,500
7,125,000
13,500,000
Alum feed
10,250
13,250
33,375
49,875
62,750
Polymer feed
23,250
23,375
23,875
24,375
25,375
Rapid mix
149,875
299,750
21498,125
2,995,000
5,990,000
Flocculation
44,500
89,000
444,625
889,000
1,775,000
Clarification
16,500
21,375
93,125
186,250
372,000
Gravity filtration
103,750
192,500
825,375
1,487,000
2,795,000
Filtration media
0
0
0
0
0
Hydraulic surface wash
9,500
17,750
91,125
181,000
373,625
Backwash pumping
15,750
31,500
151,625
315,250
630,250
In-plant pumping
283,875
551,000
2,677,250
5,322,000
10,104,125
Cl
2
feed
16,250
25,750
94,625
119,750
204,875
Clearwell storage
0
0
0
0
0
Finished water pumping
2,137,500
4,275,000
21,375,000
42,750,000
81,000,000
Admininistration, laboratory,
maintenance building
83,000
131,625
394,875
509,250
642,250
Total
3,250,250
6,385,375
31,265,500
61,953,750
117,475,250
Unit consumption (kWh / MG)
1,875
1,841
1,803
1,787
1,693
Source:
See Reference 3.
Note:
Values apply to hypothetical plants operating at 95 percent capacity; 1 mgd
3.79 Ml / d. See 30-3 for design criteria.
