Name

Phosphorus removal – achieving low P consents (case studies) and sustainable P-removal

Speakers

Neil Townend, Rebecca Shields-Smith

Authors

Neil Townend, Royal HaskoningDHV, UK
Rebecca Shields, United Utilities, UK

Description

The AMP8 WINEP programme will see the introduction of more total phosphorus (TP) consents as well as tightening of existing standards, with expectation of limits of 0.3 mg/l of below.  At present the standard solution for low TP consents, for both bio-P sites and those with existing chemical addition to the primary/secondary process, is the implementation of a tertiary solids removal (TSR) process with chemical dosing immediately prior to this.  This represents a very significant capital cost along with ongoing additional opex (chemicals and power), particularly given that lower TP consents require higher molar ratios of chemical addition.

United Utilities and Royal HaskoningDHV undertook full-scale trials on the Nereda process at Failsworth WwTW’s to explore whether direct dosing of ferric into the Nereda process, could reduce the molar ratio of chemicals required and potentially meet future consents without the need for additional TSR.  The results have shown that low molar doses (Fe:P of 1) have a synergistic effect with the existing bio-P process, delivering exceptionally low final effluent solids and TP values as low as <0.2 mg/l.  This could pioneer a new approach in AMP8, potentially removing the need for TSR capital schemes on existing Nereda sites and reducing the chemical requirements for future schemes. United Utilities installed a permanent solution and this case study/presentation will cover the initial pilot and final solution looking at performance, highlighting the significant savings to achieve the AMP 8 consent.

This presentation will present the results, discuss the implications for AMP8 and share thoughts on future trials to expand this approach.

Time

2:05 PM - 2:30 PM

Location Name

Room 1

Track

09:00 - 15:45 Phosphorus