The blooming Baltic Sea case study


Courtesy of Kemira Water Solutions, Inc.

The Baltic Sea is one of the world’s most polluted seas. This easternmost extension of the Atlantic Ocean suffers from a slow residence time which makes the small and shallow water pool particularly vulnerable to the pollution generated by 14 surrounding countries, including Russia, Scandinavia and the Baltic States.

Over the course of centuries, a massive amount of nutrients originating from agricultural, industrial and municipal waste has stocked up in the sea’s bottom sediment. In summertime, the warming water and the stockedup nutrients trigger the blooming of excessive algae.

The emission of phosphorus as well as nitrogen can be significantly reduced through the purification of wastewaters. On its own, the efficient chemical process of phosphorus filtering introduced at the St. Petersburg refi nery will diminish the entire sea area’s phosphorus overload by 5-8 percent. St. Petersburg’s waterworks and Kemira are to develop the city’s water purification system under a contract extending until 2015.

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