The work available in the literature on bivalves and other benthic organisms shows a considerable drop in the concentration of dissolved oxygen in the bays.
Good day. relative to dissolved oxygen in water, there are many nuances. first, it should be noted that wastewater often has less mineralization than seawater, so there is active desalination, which affects the development of various microorganisms, which in turn use oxygen for life. secondly, the chemical composition of wastewater can help reduce oxygen. for example, oxygen can be used to oxidize metals, and petroleum products form a film that makes it difficult to saturate seawater with oxygen. etc.
Dear R.L. Kravchynskyi , your contribution to this discussion are greatly appreciated. Thank you.
In my opinion, the answer is very simple: if you increase the input of BOD or COD into a bay, the consumption of dissolved oxygen should increase. Oxygen consumption rate does not depend on desalinization or mineralization of see water. Oxygen consumption rate in a bay depends mostly on indigenous microorganisms which start to utilize heterotrophic substrates coming into the bay with wastewater.
Regards
Vit
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