Kinetic Studies on Removal of the Solid Particulate Soil

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  • 固体粒子汚れの洗浄に関する速度論的研究
  • コタイ リュウシ ヨゴレ ノ センジョウ ニ カンスル ソクドロンテキ ケンキ

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Abstract

In a previous work, the rate equation for the washing process was proposed for fatty soil removal. Here, removal rates of soild particulate soils (Fe2O3 and Carbonblack) and redeposition rates of the removed solid particulate soils were measured by a spectrophotometric system. Kinetic analysis of the results indicated the removal of solid particulate soils to occur by elementary processes, 1 and 2, as also noted in the case of fatty soil. The rate equation for washing process proposed in the previous paper is thus applicable to the removal process of solid particulate soils. The temperature and mechanical force dependence of the rate constants of this process (k1) as obtained experimentally were examined in detail. The results of redeposition experiments of the removed soil indicated the rate constant of redeposition (k-2) to be first order kinetics. Process 2 in the rate equation is reversible, involving the redeposition of removed soil and removal of redeposited soil. The rate constant for redeposited soil removal (k2) can thus be obtained as the difference between the rate constant (slope of linear plots) of process 2 and k_2. The good agreement between k1 and k2 indicates soil removal in processes 1 and 2 to be essentially same for solid particle and fatty soil.

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