Dynamic Adsorption and Re-adsorption Characteristics of Dissolved Organic Matter on Clinker
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Hai Jiping, and Yang Chengjian
By using batch adsorption method, adsorption isotherms of dissolved organic matter (DOM) in landscape water on clinker was investigated and adsorption mass transfer process of DOM was also discussed by means of dynamic method. In addition，the re-absorption removal of DOM by clinker which without backwash-regeneration but natural air dry was researched in this paper. The study revealed that clinker as a low cost adsorbents performed well in adsorbing DOM in aqueous solutions. After adsorption balance, the maximum adsorption capacity of DOM in clinker was about 580 mg·kg-1, and the maximum removal ratio by adsorption was about 88%. The kinetic and thermodynamic data indicated that the DOM adsorption of clinker was mainly physical adsorption and chemical adsorption played only a small part. The adsorption rate was controlled both by the adsorption rate on the surface as well as the particle diffusion.At the same time, the dynamic adsorption isotherm of the random material on the cement clinker was s-shaped, in line with the BDST dynamic adsorption model.With the increase of clinker feed height, absorption capacity increased, the penetration time was prolonged, but the apparent adsorption rate constant decreased. Moreover, no backwash regeneration,natural dry cement clinker and adsorption ability of cement, cement clinker in cement clinker accumulated adsorption capacity than the original adsorption capacity increased 20% to 30%.
Clinker, Dissolved organic matter, Adsorption, Re-adsorption