2024 Volume 80 Issue 25 Article ID: 24-25033
In order to understand the effects on water bodies when dissolved oxygen is supplied to anoxic saltwater containing hydrogen sulfide, we made long-term chemical analytical tracking of water quality change after hydrogen sulfide were oxidized intentionally. We carried out experiment for 90 days under the external conditions of dissolved oxygen supply and brightness of light. As a result of experiment, it was revealed that sulfur oxidation occurred independently of light. and it was cleared that carbon dioxide was used as the oxygen source under anaerobic conditions and that nutrients were consumed. In addition, it was revealed that molar ratio of sulfur to carbon was 1:1 on anaerobic sulfur oxidation reaction. Furthermore, when hydrogen sulfide was completely oxidized, Anaerobic condition was continued for approximately 2 weeks. After that, when exposed to light, green algae was grown. And it was confirmed that dissolved oxygen was supplied through photosynthesis. It has been confirmed that nutrients and carbon dioxide are consumed during plankton growth. Considering the reuse of anoxic bottom water, it was suggested that reducing nutrients and carbon dioxide in bottom water was possible by detoxifying hydrogen sulfide.
