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Most of Europe’s urban waste water treatment plants have focused on cleaning water and returning it to the environment in just a simple, linear approach. However, with use of new techniques and innovation, these facilities can act as resource hubs providing reclaimed water, energy, nutrients and organic materials for reuse, recycling and recovery, according to the EEA report ‘ Beyond water quality — Sewage treatment in a circular economy ’.
Doing so would ensure that these vital installations deliver decisively to ambitions under the European Green Deal. The report sets out policy considerations for the transition to sustainability under the European Green Deal, focusing on the opportunities to achieve zero pollution and circularity.
Managing sewage (urine, faeces and the dirty grey water we send down our drains) as well as urban run-off from roads and industrial wastewater is far from a pollution-free process across Europe. The treatment required to minimise pollution of water can lead to the production of greenhouse gases and contaminated sludges, which can go on to pollute air, soils and water. Treatment plants are facing additional challenges such as storm water surges from extreme weather due to climate change, and the reality that there are many more pollutants in urban waste water than were previously recognized under EU legislation. We have limited understanding of the risks to aquatic life presented by mixtures of chemicals in surface waters, and many of these chemicals come from products used in our own homes. Further, the construction, maintenance and operation of waste water collection and treatment come at high financial and greenhouse gas emission costs.
Reviews and evaluations of key parts of European legislation such as the Urban Waste Water Treatment and Sewage Sludge Directives present the opportunity to modernise and improve coherence across the sector and help deliver on the ambitions of the European Green Deal. The report says action is needed in other related areas to support water treatment in achieving future sustainability and in reducing pollution. In particular, efforts are needed upstream to ensure more efficient water use and pollution control, to minimise both the volume of water to be treated and the level of contamination. Planning legislation should enable innovation in approaches to water and sewage management, since large treatment plants can deliver considerable efficiencies of scale, while decentralised sewage treatment can enable circularity at the local level.
For references, please go to https://www.eea.europa.eu/highlights/making-europes-sewage-treatment-plants or scan the QR code.
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