A relatively small existing treatment works (549 pe) that required complete refurbishment, the following equipment was supplied by WPL for the duration of the refurbishment:

  • 2 off ST500 (Steel) WPL SAF units (2 off units required to treat the 6 x  DWF as requested by SEPA)
  • 1 off HB50 transportable WPL  Lamella settling unit/primary tank.

 

Design parameters (original)

Unit Comment
Population Equivalent No 549 Domestic only, no trade
DWF 1/sec 2.9
FlowtoFullTreatment 1/sec 4.9 Instantaneous pumped flow to be treated by SAF plant
Influent BOD Kg/day 32.9 AtADF
Influent SS Kg/day 41.2 At ADF
Influent NH3-Nload Kg/day 4.4 At ADF
Primary tank design effluent BOD load Kg/day 25 N/A
Primary tank design effluent SS load Kg/day 22.2 N/A
Primary tank Effluent NH3-N Kg/day 4.4 N/A
Works Consented Effluent BOD load Mg/l 20 95%ile composite samples
Works Consented Effluent SS load Mg/l 30 95%ile composite samples
Effluent NH3 Mg/l N/A No considered for sizing plant

 

During the rental period the units performed without fault and satisfactorily achieved the required discharge consent standard of 60:40 (BOD: SS)