Veolia helps Scottish Water achieve energy self-sufficiency
Global resource management company Veolia has helped bring Scottish Water within touching distance of its target of energy self-sufficiency at its Seafield Wastewater Treatment Works, WwTW, the largest treatment works in the east of Scotland.
Since 2015 Veolia has extended the site’s capability to generate its own energy from 55% to around 85% in 2017 by boosting the renewable energy derived from a combination of anaerobic digestion of sludge and biogas fired combined heat and power (CHP) plants. In fact full self-sufficiency has already been achieved at various points during 2017, when Seafield used no electricity from the Grid.
Seafield WwTW treats waste for a population equivalent of approximately 850,000 people from Edinburgh and the surrounding area, equating to 300 million litres of wastewater every day. By implementing a range of innovations and increasing efficiency the target of energy self-sufficiency has been set as the practical target and will further sustainability and lower carbon emissions. The advances to date mean that the Seafield site has also reduced its energy costs by 50%, helping to meet value-for-money consumer criteria set for the industry.
The water industry is the fourth most energy intensive UK industry and uses around 3% of UK generated electricity for pumping, water treatment and waste management which directly contributes around 1% of the UK’s greenhouse gas (GHG) emissions. Working in partnership with Scottish Water, Veolia have introduced a wide range of measures to derive renewable energy using sludge as a valuable resource. Measures installed to date include a thermal hydrolysis process that has increased biogas production by around 10%, investment in an additional CHP unit to provide greater energy generation and to take advantage of the additional biogas, and a further 3% increase in the yield of biogas.
Commenting on the continuing development, John Abraham, Chief Operating Officer Water at Veolia said, “Recent estimates indicate that the water industry could be self-sustaining for electricity by harnessing the 11 billion litre annual flow of waste water. Our application of technology to this process demonstrates how we can help deliver greater sustainability for the industry using waste water to energy systems, and also meet water industry carbon reduction targets. In this way we can make a significant contribution towards delivering renewable energy targets, while keeping the lights on and taking pressure from the National Grid.”
More advanced technologies now mean that biogas from all the available sewage could deliver an estimated 1,697GWh - enough electricity to power over half a million homes, increasing the resilience of the National Grid and helping to control energy bills.
- Scottish Water reaches renewable power milestone Scottish Water is facilitating the generation of more renewable power than it consumes for the first time since it... Read More >
- Scottish Water announces wastewater heat recovery venture SHARC Energy Systems has joined forces with Scottish Water Horizons to establish a joint venture to expand and accelerate... Read More >
- Scottish Water progresses transformational Glasgow project Scottish Water is progressing well with its project to transform Glasgow's wastewater infrastructure and modernise a host... Read More >
- Comment: Optimising energy usage in the water industry Servelec Technologies' technical director, Marcus Fowler, discusses how the potential of demand-side response... Read More >
- Why do motors fail? Pump motors can run for half a century if they are properly maintained, writes Dave Hawley Read More >
- Bioresource data leads to focus on sludge quality The recent publication of data about the quantity and quality of sludge produced at water company wastewater treatment... Read More >
- Automation: the key to unlock energy efficiency Huge energy savings can be made by controlling pumps and other equipment using variable speed drives and automation, writes... Read More >
- Round Table: Water companies and demand-side response The attractiveness of demand-side response as an additional income stream for water companies is clear, but utilities need... Read More >