Water & Wastewater Treatment Magazine
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20 | NOVEMBER 2018 | WWT | www.wwtonline.co.uk The Knowledge Pilot plants 1. Digestion of screenings: energy and nutrient recovery from sewage screenings using dry digestion Project scope – Sewage sludge screen- ings pose an environmental and financial risk to water companies, with the current disposal routes of landfilling and incin- eration being expensive and unsustain- able due to regulatory changes and risks/ costs of disposal/treatment. The objective of this trial was to develop a cost-effective alternative to recover energy from the screenings and to facilitate a sustainable recycling route for the residuals a•er treatment. 4. Ion exchange processes for ammonia, phosphorus and metals removal from wastewater Project scope – The Water Framework Directive has set Environmental Quality Standards that will drive more stringent consents for ammonia, phosphorus and metals. In anticipation of these, Yorkshire Water wished to evaluate the potential to use ion exchange media technology as an alternative to conventional solutions. 5. Filtration using recycled glass filter media & reed bed trials Project scope – The objective of the trials was to demonstrate recycled glass as a high-value filtration media in order to develop sustainable markets for these products. The programme was to evalu- ate recycled glass products for use as filtration media and reed bed support media in wastewater treatment applica- tions. WRAP's primary aim is to have a disruptive impact on current waste routes for glass and to develop new sustainable supply chains. 2. ASP pilot plants: AMP4 Fisheries & Farming Directive (FFD) pilot trials Project scope – The EU Fisheries and Farming Directive (FFD) stipulated much more stringent ammonia concentrations for those works that were regulated under the Urban Wastewater Treatment Directive (UWWTD). This programme typically involved the 12-month operation of a pilot plant at each works to come under the legislation to develop the design data for the most robust and cost-effective solu- tion. The aim of this was to reduce costs and ensure future compliance. 6. Fertiliser production from dry- ing sludge: EU FP7 End-O-Sludg project Project scope – The objective of the programme was to demonstrate the production of high-value organ-mineral fertiliser from sewage sludge. The objec- tive of this specific trial was to produce sufficient high-quality product for use in growing trials to demonstrate the fertiliser performance. 7. High-rate wastewater anaerobic digestion (AD) trials Project scope – A textile manufacturer produces an effluent stream that is cur- rently discharged to sewer without treat- ment. They were at the capacity of their discharge consent but wished to expand production. A high rate anaerobic diges- tion process was identified as having the potential to be a low footprint solution with the added value of producing biogas for use in existing site assets. Application of this technology to textile wastewater is a UK first, helping the manufacturer to be an industry leader in sustainability. 8. Anaerobic digestion & membrane bioreactor (MBR) Project scope – The client required a treatment process to ensure future trade effluent compliance and to facilitate fu- ture water re-use projects to enhance their sustainability and to provide resilience against future changes to trade effluent charges and restrictions. An anaerobic digestion up-flow anaerobic sludge bed reactor followed by a membrane bioreac- tor (UASB-MBR) was identified as the most appropriate solution as this would meet their sustainability criteria as well as producing a high-quality effluent suit- able for passing onto advanced treatment processes for water re-use. 3. Enhanced precipitation of met- als from minewater Project scope – This will involve the de- sign, build and operation of many pilot plants to develop innovative process enhancements and resource recovery from minewater. The project involves delivery of a wide range of technologies including enhanced precipitation of metals from minewater. 9. Biological treatment for indus- trial discharge Project scope – The chemical manu- facturer currently produces an effluent which is pH corrected prior to being discharged to the river without further treatment. The pending EU BREF leg- islation for the chemical sector means there will be a requirement for biologi- cal treatment on the site to meet the future discharge consent conditions. A pilot trial is required to validate the design assumptions prior to moving into detailed design.