Phosphorus and nitrogen are the main nutrients encouraging the growth of organic matter and algae which cause eutrophication in water bodies. Water quality is now improving in water bodies all over the world in areas like the Baltic Sea thanks to projects that reduce phosphorus discharge from wastewater treatment plants.
Phosphorus removal improves water quality
The dominating process for the removal of phosphorus is chemical precipitation. Typically it is done with aluminum and iron coagulants before the biological treatment but phosphorus can also be precipitated in the biological treatment or as the final step of the treatment process. Kemira has developed a broad range of both aluminum and iron coagulants, or even tailor-made blends with our organic flocculants, with which we are able to provide the best product performance over a large range of process conditions.
Nitrogen removal is an efficient and reliable process
Nitrogen in wastewater mainly takes the form of ammonia, an ion that is difficult to precipitate. Nitrogen is therefore normally removed in a biological process consisting of two steps – nitrification and denitrification. By using our coagulants and flocculants before the biological treatment, the nitrification capacity is increased within existing volumes. We also offer carbon sources for the denitrification process in many regions. Our products support the operation of a reliable and compact nitrogen removal process.