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Which Type of Seaplant: Seagrass, Algae, and Seaweed, Can Reduce Acidity Most?

CSEF · 2026 Environmental Engineering (Junior Division)

Angelina Lam

Overview

This project investigated which type of seaplant—seagrass, seaweed, or algae—can most effectively reduce acidity in water. Ocean acidification is a serious environmental issue caused by excess carbon dioxide dissolving into seawater and lowering its pH. To model this, nine tanks were filled with a mixture of water and vinegar, and equal amounts of seagrass, seaweed, or algae were added. The pH of each tank was measured before and after one week. The results showed that seagrass consistently increased the pH the most, while algae had the smallest effect. This indicates that seagrass was the most effective at reducing acidity. This is likely because seagrass absorbs more carbon dioxide through photosynthesis, reducing the formation of carbonic acid in the water. These findings suggest that seagrass may help reduce ocean acidification and protect marine ecosystems.

Competition history

  • CSEF 2026 Environmental Engineering (Junior Division) · Entry J-11-47

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