Excessive nutrient enrichment is the root cause of eutrophication, which as many negative repercussions on aquatic systems. Although lakes and rivers naturally receive nutrient input from their catchments and the atmosphere, many human activities have accelerated and are accelerating the eutrophication problem through, for example, sewage inflows, runoff from agricultural fields and industrial effluents. Some of the symptoms include excessive growths of algae (included cyanobacteria) and aquatic macrophytes.
Research was carried out to find a solution to the problem of eutrophication.
The prevention of excessive input of the nutrients is hardly achievable since most of it is from non-point sources and derives from many extended sources.
Filtration of surface water could be an effective technique, but the experimental result shows that it should be combined with further treatments.
Ultrasonic irradiation has recently been considered as an alternative solution to control algal blooming. Some devices using this principle proved to be effective and are already on sale.
The problem of eutrophication is still very actual and research is still being developed to reduce the water bodies’ pollution caused by algal growth.
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