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Updated: May 4, 2026

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
Published on: March 6, 2014
Suppression of phosphorus release from sediments using water clarifier sludge as capping material
Makiko Ichihara1, Takayuki Nishio2
1Osaka City Institute of Public Health and Environmental Sciences, Osaka, Japan. mak-ichihara@city.osaka.lg.jp
Sintered water clarifier sludge effectively caps eutrophic pond sediments, preventing phosphorus release. Optimal results were achieved with sludge sintered at 600°C, which also reduced nitrogen flux.
Area of Science:
- Environmental Engineering
- Water Treatment
- Sediment Remediation
Background:
- Eutrophic ponds suffer from excessive nutrient enrichment, leading to harmful algal blooms.
- Sediment nutrient release, particularly phosphorus, exacerbates eutrophication.
- Water clarifier sludge is a potential capping material for sediment remediation.
Purpose of the Study:
- To evaluate water clarifier sludge as a capping material for eutrophic pond sediments.
- To determine the effect of sintering temperature on sludge performance.
- To assess the reduction of nitrogen release from sludge.
Main Methods:
- Sediment incubation experiments over two months.
- Testing five capping materials: sludge, sludge sintered at 200°C, 400°C, 600°C, and sea sand.
- Analysis of phosphorus and nitrogen release using Freundlich adsorption isotherms.
Main Results:
- Sludge sintered at 400°C and 600°C, along with sea sand, suppressed phosphorus release.
- Sludge sintered at 600°C demonstrated the most effective reduction in total nitrogen (TN) flux.
- Sintered sludge at 600°C exhibited low organic content and high phosphorus adsorption capacity.
Conclusions:
- Water clarifier sludge sintered at 600°C is a suitable capping material for preventing phosphorus and ammonium-nitrogen release from sediments.
- Complete removal of nitrogen and organic substances from sludge is crucial to avoid nutrient release.
- Sintering enhances sludge's effectiveness in sediment remediation and nutrient control.
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