Chemicals Investigation Programme 2

DynaSand Oxy for combined Phosphorus and Ammonia removal: experiences from Anglian Water

Adam Brookes1, Paul Barter2

1 Anglian Water2 Hydro International

The Big Phosphorus Conference, Manchester, 4th and 5th July 2017

National Collaborative Project

DynaSand Oxy for combined Phosphorus and

Ammonia removal

Content:

• Process description and history

• Trial site and results

• Conclusions

Process Background

• Used in Anglian Water since late 1990s for

P removal, such as Stalham WRC in Norfolk Broads

• Not used for both ammonia and phosphorus

removal to very low concentrations so included in

the trial, phosphorus removal is priority

Dynasand Oxy filter - continuous sand filtration system

1. Inlet distributor

2. Filtrate outlet

3. Media with entrapped

solids

4. Airlift pump

5. Media washer

6. Washer labyrinth

7. Washwater outlet

8. Media bed

Site PE site Upfront

Process

No.

filters

Trial max flow

Watton WRC 13,900

Trickling filter

with ferric dosing

in PSTs

6 80 L/s (30.7 L/s DWF)

CIP2 Low P Programme – DynaSand Oxy trial site

Anglian Water – Dyna Sand Oxy trial site

Watton WRC

Results of DynaSand Oxy trial – Summary of influent

Company Average

(mg/l)

Min

(mg/l)

Max

(mg/l)

Total P 1 0.7 1.7

SRP 0.5 0.17 0.9

Ammonia* post Jun ‘16

2.41.7

0.70.7

7.93

Results of DynaSand Oxy trial – Summary of effluent

Company Average

(mg/l)

Min

(mg/l)

Max

(mg/l)

95 %ile

(mg/l)

Total P 0.29 0.13 0.7 0.65

SRP 0.17 0.04 0.43 0.42

Ammonia* post Jun ‘16

0.870.39

0.230.23

5.420.96

2.660.83

Phosphorus

Ammonia

Conclusions

• Total phosphorus concentration of 0.3 mg/L and Ammonia < 1 mg/L

were achieved providing stable operation upstream and no increased

loading (e.g. from sludge liquors)

• Optimisation carried out when site receiving relatively low phosphorus

load

• Nitrification was not inhibited at low SRP concentration during the trial

• Extended operation at low temperatures not encountered

• Thanks to @one alliance delivery team and operations team

Any Questions?Questions?