AI Article Synopsis
- In 2020, regulations will lower the maximum allowable sulphur content in marine fuel from 3.5% to 0.5% to reduce harmful emissions.
- Some ships use seawater scrubbers to clean exhaust, but these systems release acidic washwater back into the ocean, which can contain nutrients and contaminants.
- A study found that exposing a Baltic Sea microplankton community to 10% scrubber washwater for 13 days increased key organic compounds, while lab tests with certain algae showed varied effects on photosynthesis and productivity, indicating species-specific responses to the washwater.
Article Abstract
In 2020, the global cap of maximum allowable sulphur content in marine fuel will be reduced from the current 3.5% to 0.5%. Another way to reduce the sulphur emissions is to install a seawater scrubber that cleans exhausts but instead release acidic water containing nutrients and contaminants back to the marine environment. In the current study, scrubber washwater was tested on a Baltic Sea microplankton community. A significant increase in chlorophyll a, particulate organic phosphorus (POP), carbon (POC) and nitrogen (PON) were observed when the community was exposed to 10% scrubber washwater for 13 days as compared to the control. A laboratory experiment with the filamentous cyanobacteria Nodularia spumigena and the chain-forming diatom Melosira cf. arctica showed negative responses in photosynthetic activity (EC10 = 8.6% for N. spumigena) and increased primary productivity (EC10 = 5.5% for M. cf. arctica), implying species-specific responses to scrubber washwater discharge.
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| http://dx.doi.org/10.1016/j.marpolbul.2019.05.023 | DOI Listing |
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Article Synopsis
- In 2020, regulations will lower the maximum allowable sulphur content in marine fuel from 3.5% to 0.5% to reduce harmful emissions.
- Some ships use seawater scrubbers to clean exhaust, but these systems release acidic washwater back into the ocean, which can contain nutrients and contaminants.
- A study found that exposing a Baltic Sea microplankton community to 10% scrubber washwater for 13 days increased key organic compounds, while lab tests with certain algae showed varied effects on photosynthesis and productivity, indicating species-specific responses to the washwater.
Controlling Nitrosamines, Nitramines, and Amines in Amine-Based CO₂ Capture Systems with Continuous Ultraviolet and Ozone Treatment of Washwater.
Environ Sci Technol
July 2015
‡Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305, United States.
Formation of nitrosamines and nitramines from reactions between flue gas NOx and the amines used in CO2 capture units has arisen as a significant concern. Washwater scrubbers can capture nitrosamines and nitramines. They can also capture amines, preventing formation of nitrosamines and nitramines downwind by amine reactions with ambient NOx.
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