Case Study: Stirling Landfill Site – Polmaise

Supply of full biological wastewater treatment plant for Stirling landfill site

Project ID:

Company: Stirling Landfill Site – Polmaise
Location: Scotland
Year: 2001
Description: Supply of full biological wastewater treatment plant for landfill leachate
Goal: Reduce Ammonia, COD, BOD and TSS
Capacity: 500 m3/day
Water Source: Landfill Leachate

The Problems:

  • The landfill leachate contained high levels of organic materials and ammonia.
  • The effluent contaminated the nearby water sources.
  • Anaerobic conditions created odor nuisance to the neighboring communities.
Parameter Existing Values Required Value
Turbidity (NTU) 150 < 5
Ammonia (PPM) 1000 < 5
COD (PPM) 5000 < 200
BOD (PPM) 2000 < 10
TSS (PPM) 1000 < 10
TOC (PPM) 1000 < 10
Odor Issues   Minimize

Technical Solution:

The following processes were carried out:

  • Nutrient Dozing and PH Adjustment.
  • Sequential Batch Reactor (SBR): A biological batch process which effectively removes in a few steps (each one with different oxygen conditions) ammonia and organic materials.
  • AFM® - Catalytic Media filtration with coagulation. A polishing stage which removes residual organic and mineral matter. This stage implements our air diffusers.


Parameter Required Value Before treatment After treatment
Turbidity (NTU) 5 30 0.5
Coliform Forming Units (CFU/100 ml) 10 10,000 nil
Color (UC) 15 100 5
Ferric (mg/l) 1 7 0.3
Manganese (mg/l) 0.2 2 0.05

Dryden Aqua’s Deliverables: