Passive Treatment of CSO and SO Effluent, the application and benefits of NbS : PRESENTATION ONLY

David Thomas/ David Naismith, Mott MacDonald, UK


The Issue
Water Quality Impacts and High Profile at Present
• Considerable public and press interest in the issue
• Live maps showing where spills are occurring
• Measured in hours but quantity and quality more relevant for environmental impact
• Greater public awareness
• Oxygen demand
• Suspended solids
• Ammonia
• Sewage fungus

Aquatic ecology
• Invertebrates
• Fish spawning
• Recreational access
• Businesses reliant on aquatic and marine environment • Shell fisheries • Water sports • Beaches – tourist industry in coastal areas − Closing of Blackpool beaches to swimming June ‘23

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