Name

A deep dive into the phosphorus dynamics of surface flow treatment wetlands

Speakers

Ayisha Affo Souleymane

Authors

Ayisha Affo Souleymane, Gabriela Dotro, Robert Gabrowski and Tao Lyu, Cranfield University, UK

Description

This presentation explores the phosphorus dynamics of two tertiary surface flow treatment wetlands, Langham and Ingoldisthorpe, located in Norfolk, UK, comparing their approaches to phosphorus removal. Langham, constructed in 2022, relies on natural processes without upstream chemical dosing, while Ingoldisthorpe, operational since 2018, receives chemically dosed influent for phosphorus reduction. Both wetlands achieve significant reductions in total phosphorus (TP) concentrations from inlet to outlet, though their removal mechanisms differ.

Langham demonstrates a balanced distribution of iron-bound and calcium-bound phosphorus across wetland cells, supported by natural retention processes that sustain stable phosphorus removal. In contrast, Ingoldisthorpe shows a higher proportion of iron-bound phosphorus in sediment due to chemical dosing, accompanied by reduced plant productivity linked to root iron accumulation and oxidative stress. Dissolved phosphorus trends dominate removal in both wetlands, while particulate and colloidal fractions remain relatively stable.

These findings highlight the potential of naturally optimized systems like Langham to achieve efficient nutrient removal while maintaining ecosystem health. This study provides actionable insights into the design and management of surface flow wetlands, promoting sustainable nutrient management solutions applicable to diverse environmental settings.

Time

10:15 AM - 10:40 AM

Location Name

Room 1

Track

09:00 - 15:45 Phosphorus