[Control effect of different covering patterns on indigenous nutrient release from sediment]

Area of Science:

• Environmental Science
• Water Quality Management
• Sediment Geochemistry

Context:

• Aquatic ecosystems face pollution from excess nitrogen and phosphorus.
• Sediment nutrient release exacerbates water quality degradation.
• Controlling internal phosphorus and nitrogen loading is crucial for remediation.

Purpose:

• To evaluate the efficacy of various sediment coating materials in suppressing nutrient release.
• To investigate the impact of different coating materials on phosphorus and nitrogen dynamics.
• To understand the influence of water temperature on sediment nutrient release.

Summary:

• Laboratory experiments assessed sediment coating materials (plastic, clinoptilolite, calcite, quartz sand, calcium nitrate) for controlling phosphorus and nitrogen release.
• Plastic and calcium nitrate showed the highest efficacy for total phosphorus control, while clinoptilolite was most effective for total nitrogen.
• Calcium nitrate and plastic were effective for controlling nitrate-nitrogen (NO3-N) and ammonium-nitrogen (NH4+-N) release, respectively.
• Increased water temperature correlated with higher total phosphorus, total nitrogen, and NO3-N concentrations, but decreased NH4+-N.

Impact:

• Provides data for selecting effective sediment capping materials to mitigate eutrophication.
• Offers insights into managing internal nutrient loading in polluted water bodies.
• Highlights the role of temperature in sediment-water nutrient exchange, informing predictive models.