Serpentine as Adsorbent for Removal of Phosphates from Water.

摘要

Among the processes that have been suggested for phosphate removal from wastewater are sorption processes using either activated alumina or fly ash as adsorbents. Other substances,however,might be superior to alumina or fly ash either because of inherent superiority,cost or local availability. In this study serpentine was used as an adsorbent and precipitant for aqueous phosphate ions. For comparison, a number of adsorption experiments have been performed using Linde A and olivine. Additional information on adsorption processes were obtained from electrokinetic measurements on the minerals,particularly serpentine,under varying pH and phosphate concentrations. The adsorption capacity of PO4onto various minerals decreases in the sequence chrysotile greater than olivine greater than serpentine (NY) greater than serpentine (CAL) greater than Linde A (Al2O3). The pH ranges of greatest PO4adsorption are chrysotile-pH 4-10, Serpentine (CAL)-pH2, Olivine-pH2, Linde A-pH2,and Serpentine (NY)-pH12.