Påverkan av djup och fosfors tillgänglighet på konstruerade våtmarkers förmåga att avskilja kväve

Sammanfattning: Eutrophication is an expanding issue due to the increase of human-induced nitrogen leakage from agriculture. Eutrophication can lead to severe environmental problems such as exaggerated algal bloom and oxygen deprivation in water courses. One approach to clear away nitrogen is to use constructed wetlands. Wetlands have the ability to clean the water that flows through it by biological, chemical and physical reactions. The aim of this study is to determine if a deep or shallow wetland is more advantageous in removing nitrogen and how phosphor addition affects nitrogen removal. The method used was analysis of concentrations of nitrate, nitrite (NO3- + NO2-) and phosphorous from the years 2018 and 2019 from an experimental wetland in Halmstad, Sweden, and carrying out a quantitative experimental study. The results showed that NO3- + NO2- removal was higher in deeper wetlands for both years and for the removal rate coefficients in 2019. Ponds with phosphorus addition had an increase in NO3- + NO2- removal. The research conclusion was that the deeper wetlands are more efficient at removing nitrogen than shallow. Phosphorous addition increases the nitrogen removal in both shallow and deep ponds. Shallow wetlands might have potential to become superior compared to deep wetlands when the vegetation and bacteria establish. This statement however requires further research.