Abstract
A water purification process is essential in flow waste water away from agricultural facilities or in using water for agricuture, but it in general costs much. Rocks produced abundant in nature are porous structure and have property of adsorbing solid material in suspension because of charge on the surface, and therefore it will have potential for one of useful methods of water purification methods. However, pollutant adsorption capacity of natural rocks is still not clear from qualitative point of view.HomePage
Then, to quantitatively determine the mass adsorption capacity of natural rocks, a series of adsorption tests were conducted at the solution temperatures ranging from 10 to 30oC with an initial maximam methylene solution concentration ranging from 10 to 20 ppm, using methylene blue as adsorptive medium. Four kinds of natural rocks, shist rocks, serpentine rocks, Chinese quartz porphyry rocks and 'Hyuga' quartz porphyry rocks were used for the tests. A mass adsorption process model constructed from a combination of Langmuir's adsorption rate equation and adsorption isothermal equation classified as I type of IUPAC's classification of equation types was proposed. Then the adsorption process was simulated using this model.
It was found that daily changes in methylene quantity adsorbed on the rocks tested were simulated well, and the basic adsorption properties of those rocks were well simulated and estimated.
The results demonstrated that the adsorption rate of rocks at 20oC was more rapid than that at 10 or 30oC, and also indicated that total adsorption quantity on the rocks peaked at 30oC reaching 8.02 x 10-7 to 9.03 x 10-7g/grocks, which were 4 to 4.5 times values at 10 and 20oC. Keywords: Methylene blue, Natural rocks, Pollutant, Estimation of Adsorption Capacity