Research Of Phosphate Removal From Waste Water By Fe-modified Bamboo Charcoal

The phosphate in waste water is concerned to be one of the most significant reasons on coursing eutrophication, which is the major drawback in water resource using. Adsorption is one of the techniques, which is comparatively more useful and economical for phosphate removal than chemical and biological. The application of low cost and easily available materials in eutropication controlling has been widely investigated.In this article, the Fe-modified bamboo charcoal have been serves as the absorbent in phosphate absorption, and the method of modification,the ability of phosphate removal,the way of desorption have been studied as well.The results have been displayed as followed:1)The bamboo charcoal can be modified effectively when the concentration of FeCl3 come to 1.5 mol·L-1, and the temperature of calcination approach to 400°C, in this condition, the content of Fe can reach to 41.53mgFe/g charcoal.2)The results of static tests shows that the absorptive capacity of phosphate removal can reach to the maximum of 0.45mg·g-1 in 10min when 1g modified bamboo charcoal was put into 50mL solution(pH=6~7).3)The experiment of adsorption kinetics study indicates that the adsorption process follows the pseudo second-order rate expression; and the experimental data are correlated reasonably well by Freundlich adsorption isotherm.4)The dynamic experiment presents that the bamboo charcoal bed can stainable work 400 bed volume with the 90% efficiency of phosphate removal when the hydraulic loading is 24m3 /(m3·d).5) The desorption tests demonstrates that the NaOH can desorption the phosphate from modified bamboo charcoal effectively with the removal rate of above 50%, nearly despite the number of desorption.