Wastewater Forum


Meeting 3rd November 2015
Please note that for older reports some links will be to sites that are no longer active.

This was the Forum’s 57th meeting and was held at CIWEM’s HQ.

Tim Evans announced his retirement and would therefore be standing down as Technical Secretary of the Forum. Steve Bungay, an independent consultant with over 25 years of experience in wastewater and sludge treatment would be taking on the task. All present thanked Tim for his service and contribution over the years.

Reports from Topic Leads

Infrastructure & Economics - Stephen Palmer

Totex – need to reduce whole-life costs sustainably. An example of this is considering retrofittable technologies such as the use of ballasted media in conjunction with activated sludge, or micro-flotation DAFs installed into existing radial flow PSTs.

Flow & Quality - Oliver Grievson

Peter Vale

STW are looking at on-line VFA monitors to control loadings to digesters. PV commented that the WRC are looking at non-contact organic load sensors, using infrared absorbance and reflected light. STW have also looked at nitrous oxide emissions from activated sludge, but it utilised laboratory instruments for field applications.

Biosolids - Andrew Wheatley, Tim Evans

Resilience - David Butler

Resilience is essentially about “beyond failure”. This presents Ofwat with difficulty with how this is regulated. Does Ofwat regulate Engineers, designs, and assets?

Legislation – Barrie Howe

Surface Water – Nick Orman

Technical Presentations

The effects of urban growth on downstream water resources
Dr Michael G. Hutchins, Catchment Water Quality Modelling, CEH Wallingford, and Prof Steven Loiselle, Senior Freshwater Research Manager, Earthwatch

Mike presented some of the results from the research project he is leading which is looking at effects of urban growth on downstream water resources. One aspect of Mike’s research involves getting communities directly involved in water quality modelling; he is looking for End-users, Advisors, and Facilitators in the community to be involved with the project. In addition he discussed some ideas relating to forecasting water quality for which he is undertaking a scoping study and canvas opinions from a catchment partnership perspective and from water industry more generally.

FOG - forget size: it's the distribution that matters - time to reconsider separators
Martin Fairley, Research Director, ACO Technologies plc & PhD candidate Cranfield University

FOG is not simple. Particle size distribution should be a fundamental consideration in evaluating performance of separators. Considering kitchen waste, any particles smaller than 270 um will not be floated in a traditional UK separator, with most particles above this size being food and not FOG. Circumstances where there is high FOG, and high fat requires more than one treatment system due to the particle size distribution. For mitigating stormwater pollution the art is advancing rapidly with Germany and some of the US States adopting carefully considered criteria for testing proprietary products.

Date of next meeting of the Forum Tuesday, 8th March, 2016