The Green Agenda – Who Gives a Floc?Siobhán McGrath

Cranfield University

Raw Water Coagulation Filtration Disinfection

www.trust-i.net - info@trust-i.net

Natural Organic Matter (NOM)

How do changes in raw water quality effect floc strength?

10.4 mg.l-1 DOC 1.5 m-1.l mg-1.C SUVA

2.0 NTU

2.8 mg.l-1 DOC3.7 m-1.l mg-1.C SUVA

3.7 NTU

4.8 mg.l-1 DOC4.6 m-1.l mg-1.C SUVA

0.88 NTU

SITE 1

SITE 2

SITE 3

Siobhán McGrath

Siobhán McGrath

Siobhán McGrath

Natural Organic Matter (NOM)

Siobhán McGrath

XAD-4 XAD-7HP

Siobhán McGrath

10.4 mg.l-1 DOC 1.5 m-1.l mg-1.C SUVA

2.0 NTU

2.8 mg.l-1 DOC3.7 m-1.l mg-1.C SUVA

3.7 NTU

4.8 mg.l-1 DOC4.6 m-1.l mg-1.C SUVA

0.88 NTU

SITE 1

SITE 2

SITE 3

How do changes in raw water quality effect floc strength?

Image: Hydro-Zone Inc. http://www.hydro-zoneinc.com/wastewater.htm accessed 16.04.13

Siobhán McGrath

4.8 mg/l DOC 7.2 mg/l DOC

Siobhán McGrath

Siobhán McGrath

Is there a way to predict treatability based on water quality?

How can water treatment plant operators react to these variations?

How can the water industry design WTWs for an uncertain future?

(Hopefully I will have all these answers in a year!)

The Green Agenda

Not just energy efficiency and saving water!

@IrishFemgineer

uk.linkedin.com/in/SMcGrathCEng

s.mcgrath@cranfield.ac.uk