This handbook deals with natural treatment systems and the challenges the water industry faces in dealing with sustainability and the realisation of reaching Net Zero by 2030. Surface waters are all under threat, with freshwater ecosystems now facing unprecedented levels of contamination, even after a century of ever stricter legislation and regulation. The increase in population and especially in urbanization without sufficient planning and investment to ensure adequate wastewater collection and treatment coupled with the need to reduce greenhouse gas emissions associated with wastewater treatment is leading to a crisis in wastewater treatment in many countries. Natural treatment systems which use plants and soil micro-organisms are very much nature-based solutions and wherever applicable might offer sustainable and low emissions options for a range of wastewater problems protecting surface waters as well as creating new habitats to support and enhance wildlife diversity. In terms of circularity, natural treatment systems have the potential to produce a staggering array of useful and valuable by-products, including high-value compounds for the pharmaceutical industry. Key Features • Conventional energy-demanding treatment systems such as activated sludge are constantly being modified and retrofitted in order to cope with ever increasing demand for resources which often result in even greater carbon emissions; raw or partially treated sewage is discharged into surface waters. So conventional treatment is at a crossroads where new sustainable solutions are required if we are to ensure and protect the quality of our rivers, estuaries and seas to conform with the carbon emissions targets. Natural treatment systems offer an alternative avenue of wastewater treatment options that are sustainable, affordable and flexible • This handbook offers an in depth introduction, while also offering those engaged in wastewater treatment possible alternatives to current practice. The need to move to sustainable options in wastewater treatment and the importance of the circular economy in to the industry is explained showing what options are available and how they can be used. The book emphasizes the biologically and how that relates to operation

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