Reliably meeting very low Total P permits (while not breaching the metals permit!): PRESENTATION ONLY

Proceedings

Reliably meeting very low Total P permits (while not breaching the metals permit!): PRESENTATION ONLY

O’Shea, T. and Kissack, C., Severn Trent Water, UK
(free)

• Background
• Tertiary Solids Removal (TSR)
• Dosing
• Monitoring
• Example site
• Summary

• New AMP6 Total-P permits 110+, 20+ less than 0.5 mg/l Total-P
• New AMP7 Total-P permits 190+, 60+ less than 0.5 mg/l Total-P
• Generally, very low P permits require a pre-dosed TSR solution. This leads to an increased risk of
metals breakthrough.
• It has been possible to meet permits as low 0.4 mg/l with just TSR on some sites. Though this leads
to increased reliance on a singular primary dose point (potential alkalinity/ nitrification impact).

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Proceedings