STS

Surface area required (m²)

Effluent BOD (mg/l)

Effluent faecal coliforms (FC per 100 ml)

Initial STS

14,652

44.4

35,600

Well sized WSPs (Scenario 1)

31,486

12.5

1,000

Optimized initial STS (Scenario 2)

14,316

26.7

1,932

Hybrid STS (Scenario 3)

16,513

20

195