WWTP Types

The look-up table WWTP_TYPE is used for selecting facilities. It also helps to understand the coding in table FACILITIES.

 TYP_LOSS , the percentage of typical loss in the treatment plant due to infiltration and evaporation, is from the master plan. This figure is important to convert from wastewater inflow to wastewater effluent.

Note: This table was recently changed and needs still to be updated under ORACLE.

CODE DESCRIPTION TYP_LOSS COMMENTS
- others or n/a 0
0 Not WWTP 0
1 pond 25
2 activated sludge 5
3 extended aeration 5
4 aerated ponds 20
5 Imhoff tanks 5
6 trickling filters 5
7 trickling filters + maturation pond 10
8 extended aeration + maturation pond 10