Proceedings

Familiar Problems at WwTW’s

• Blowers housed in buildings – huge capital costs

• Blower Room – Inadequate Ventilation • Oversized Blowers

• Poorly Maintained DO Monitors • Very Low Ammonia Levels Achieved ( < 1mg/l NH3 )

• Scum Visible at Aeration Lanes • Anoxic Zones That Have DO Levels (Recirculation)

• Poor Pattern Test in Aeration Lanes

• Compliance At Any Cost!!

Background – Drivers

• Regulator Driven Requirement for Energy Expenditure Reduction

• Current Electricity Cost £30M pa • Target Reduction

• NIW put in hand several projects to deliver above target.

• Aeration Optimisation Project Performance

• Target £205k sustainable per annum.

• Delivered £280k pa.

• Potential £380k pa