RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2007, Vol. 16 >> Issue (1): 31-36.

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ADSORPTION AND DESORPTION OF PHOSPHORUS ON SUSPENDED PARTICLES IN THE THREE GORGES AREA

WANG Xiaoqing1, LI Zhe2, LV Pingyu1, GUO Jingsong2   

  • Received:1900-01-01 Revised:1900-01-01 Online:2007-01-20

Abstract:

The adsorption and desorption behavior of phosphorus on particles in the Three Gorges Area was studied by synchronous monitoring and laboratory experiments. Monitoring experiment revealed a close relationship between phosphorus concentration and particle content. Laboratory experiments were carried out in isothermal adsorption equilibrium and kinetics by mixture particles, the size of which was classified by D1≤0.020 mm and D2≤0.008 mm. The isothermal adsorption equilibrium experiments showed that the particle size has great effect on adsorption amount, with the adsorption amount increasing with the decrease of particle size. The data from kinetics experiment fitted by the secondorder kinetics equation showed that the kinetics coefficient was affected by particle size, particle content and phosphate concentration. Under the condition of the same particle content and initial phosphate concentration, the kinetics coefficient was greater on thinner particles. Adsorption and desorption experiments were carried out by using particles from Cuntan crosssection. The adsorption experiment data can well be fitted by Langmuir kinetics equation, with rate coefficient k being greater on the coarser particles, and initial phosphate concentration having no obvious effect on rate coefficient k. The desorption experimental data fitted by Langmuir kinetics equations showed that the phosphate desorption amount decreased with the increase of particle concentration and particle size, and rate coefficient k decreased with the increase of particles size. There was no obvious effect of particle size on coefficient k.

Key words: suspended particles, total phosphorus, phosphate, adsorption, desorption

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