[Property of adsorption about ammonium on suspended mineral matters in eutrophic water]

Static experiments were performed to investigate the adsorption characteristics of ammonium by suspended mineral matters (SPM). Three kinds of suspended mineral matters including montmorillonite, kaolin and the particles separated from the sediments of the Taihu Lake were used as the sorbent. The experiments show that the equation could be gotten within 30 min, and that the ammonium adsorption on mineral particles conformed to Herry isotherm. The parting coefficient of the adsorption about ammonium could reach 548.30, 287.36, 191.27 L/kg in experimental condition that there were 1 000 mg/L mineral particles and 1.0 mg/L ammonium in water with pH 7.00. Some effectors such as temperature, pH and salinity of the water on the adsorption about ammonium were observed. The results show that the quantity of adsorbed ammonium slightly decrease with the increasing of temperature and salinity, and greatly do with increasing of pH. The quantity decrease rapidly also with the increasing of the content of mineral particles below 1 000 mg/L.