Application of Gypsum Granule as a Capping Material to Reduce Phosphorus Release from Sediment of Lake Paldang


Article Preview

In this study, the capping effects of granular gypsum (Ca2SO4·2H2O) and sand on sediment and water column were evaluated in in-situ experiments in Lake Paldang. The results indicate that capping treatment is very effective for the restoration of eutrophied lake. It was demonstrated that phosphorus, T-N and T-P concentration in the water column of treated basin was relatively lower than control basin. As a consequence of reduction of nutrient concentration by capping treatment, chlorophyll-a concentration in treated basin was considerably lower than control basin. The chlorophyll-a concentration in water column could be reduced to 52% and 25% as compared to control basin, respectively, by the capping treatment with gypsum and sand. From the experimental results, it was concluded that gypsum was more effective capping material than sand for controlling of nutrients and chlorophyll-a. In addition, capping with gypsum bring calcium cation into sediment, which offer more site for phosphorus to bind. In case of the capping with gypsum, apatite P composition, mainly consist of Ca boun P, in the sediment increased from 24% to 43% for the two month of operation.



Materials Science Forum (Volumes 544-545)

Edited by:

Hyungsun Kim, Junichi Hojo and Soo Wohn Lee




Y. J. Park et al., "Application of Gypsum Granule as a Capping Material to Reduce Phosphorus Release from Sediment of Lake Paldang", Materials Science Forum, Vols. 544-545, pp. 521-524, 2007

Online since:

May 2007




[1] V. P. Salonen and E. Varjo: Gypsum treatment as a restoration method for sediments of eutrophied lakes-experiments from southern Finland, Environ. Geology, Vol. 39 (2000), p.353.


[2] S. Wang, X. Jin, H. Zhao and F. Wu: Phosphorus fractions and its release in the sediments from the shallow lakes in the middle and lower reaches of Yangtze River area in China, Colloids and surfaces, Vol. 273 (2006), p.109.


[3] R. K. Mohan, M. P. Brown and C. R. Barnes: Design criteria and theoretical basis for capping contaminated marine sediment, Applied ocean Res., Vol. 22 (2000), p.85.


[4] APHA, AWWA, WEF: Standard Methods for the Examination of Water and Wastewater, 20 th edition, Americal Public Health Association, Washington, D.C. (1998).

[5] A. H. M. Hieltjes and L. Liklema: Fractionation of inorganic phosphates in calcareous sediments, J. Environ Qual., vol. 9 (1980) p.405.