Nine years of phosphorus management with lanthanum modified bentonite (Phoslock) in a eutrophic, shallow swimming lake in Germany

ABSTRACTEpe TS, Finsterle K, Yasseri S. 2017. Nine years of phosphorus management with lanthanum modified bentonite (Phoslock) in a eutrophic, shallow swimming lake in Germany. Lake Reserve Manage. 33:119–129.Eutrophication is threatening shallow lakes, their functioning and ecosystem services. In recent years, lanthanum modified bentonite (LMB) has been increasingly applied to eutrophic lakes to enforce recovery processes by increasing sediment phosphorus (P)-sorption capacity and reducing P in the water column. In this long-term study, we examined the water quality characteristics of a polymictic, eutrophic swimming lake in central Germany, Lake Barensee, an artificial, excavated lake suffering from frequent cyanobacterial blooms caused by nutrient enrichment, mostly from swimmers, runoff, and P release from the sediments. Barensee was first treated with LMB in 2007. This restoration method is based on the strong ionic bond formed between lanthanum (La) and phosphate (PO4), which results in the formatio...