PROCESS-DEVELOPMENT FOR REMOVAL AND RECOVERY OF PHOSPHORUS FROM WASTE-WATER BY A NEW ADSORBENT .2. ADSORPTION RATES AND BREAKTHROUGH CURVES

Adsorption rates of biphosphate ion and tripolyphosphate ion on the newly developed adsorbent were analyzed by batchwise and flow adsorption tests. The adsorption rates were controlled by the intraparticle diffusion rates, and the diffusion coefficients were changed with the concentration of the ions in solutions. The breakthrough curves could be predicted from the Freundlich type adsorption isotherms and the intraparticle diffusion coefficients obtained by batchwise tests for the influent concentration. Therefore, the breakthrough times, namely, the regeneration cycles, could be predicted for various conditions, and the feasibility of the process using the new adsorbent was estimated for removing the recovering phosphorus from wastewater.