Denmark tightens environmental rules
The Danish government has announced a regulation that will ban the discharge of ship wastewater from open exhaust gas cleaning systems (scrubbers) into Danish territorial waters from 1 July 2025. Scrubbers are used to comply with the limit value for the sulphur content of exhaust gases set by the International Maritime Organisation (IMO) in 2020. Such exhaust gas cleaning systems use a chemical solution (seawater and caustic soda) to "wash" sulphur out of the flue gases. The wash water then contains heavy metals (mercury, lead, arsenic, etc.), nitrates, polycyclic aromatic hydrocarbons (PAHs) and sulphur: a toxic mixture that changes the pH value and makes the water acidic! Because there is no further purification step in open systems,...
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