Waste Water Treatment Plant Design Data
| Flow, mgd |
| Average Annual |
0.23 |
0.30 |
| Maximum Day |
0.38 |
0.30 |
| Peak Hour |
0.69 |
0.91 |
| BOD and SS, PPD |
| Average Annual |
323 |
424 |
| Maximum Month |
517 |
694 |
| Maximum Day |
646 |
868 |
| Headworks |
| Bar Screen |
| Type MANUALLY CLEANED |
| Number |
1 |
1 |
| Size, inches |
16 |
16 |
| Bar Spacing, inches |
1 |
1 |
| Comminutor |
| Type |
IN-LINE |
IN-LINE |
| Number |
1 |
1 |
| Size, inches |
12 |
12 |
| Motor, hp |
6 |
6 |
| Flow Measurement |
| Type PARSHALL FLUME |
| Number |
1 |
1 |
| Throat Width,inches |
6 |
6 |
| Aeration |
| Number of basins |
1 |
1 |
| Volume, mgal |
0.67 |
0.67 |
| Theoretical hydraulic residence in time hours: |
| Average Annual |
70 |
53 |
| Maximum Month |
42 |
32 |
| Design Waste Sludge Production, ppd |
312 |
420 |
| Design Mixed Liquor Concentration, mg/1 |
2,200 |
3,000 |
Design Sludge Mean Cell Residence
Time, Days |
40 |
40 |
| Design Temperature, Degrees C |
| Low Month |
10 |
10 |
| Average Month |
15 |
15 |
| Type HIGH SPEED MECHANICAL FLOATING SURFACE |
| Number |
1 |
2 |
| Size, hp (ea |
25 |
25 |
| Design Maximum Oxygen Transfer, ppd |
750 |
1,500 |
| Mixer |
| Type HIGH SPEED MECHANICAL FLOATING SURFACE |
| Number |
1 |
0 |
| Size, hp |
20 |
| Secondary Sedimentation |
| Number of tanks |
1 |
1 |
| Diameter, ft |
35 |
35 |
| Overflow rate, gpd/sf |
| Average Annual |
239 |
312 |
| Peak Hour |
717 |
946 |
| Solids Loading Rate, ppd/sf |
| Average Annual (50% return) |
9 |
12 |
| Peak Hour (100% return) |
36 |
47 |
| Return Sludge Pumps |
| Number |
2 |
2 |
| Design Maximum Capacity, gpm |
630 |
630 |
| Infiltration Basins |
| Number |
8 |
8 |
| Surface Area |
0.44 |
0.44 |
| Net Hydraulic Loading rate, in/wk |
| Average Annual |
16.8 |
21.9 |
| Maximum Month |
27.7 |
36.6 |
| Sludge Disposal System |
| Type LIQUID SLUDGE LAND APPLICATION |
| Land Area, acres |
13 |
13 |
| Sludge Loading, |
| Tons per acre per year |
3.7 |
5.3 |