Abstract
A basic study of the rate and mechanisms of phosphorus removal from water in batch reactor was conducted. The material of the adsorbent used enhanced phosphorus removal capacity after iron (II) sulfate pretreatment, maybe due to the formation and precipitation of iron (II) phosphate. To clarify the mechanisms, adsorption and precipitation were separately measured and analyzed. Results showed that the adsorption of phosphorus onto an adsorbent is expressed by the second-order reaction kinetics, while the precipitation of iron (II) phosphate is expressed by the first-order reaction kinetics. After pretreatment with iron (II) sulfate, the conditions for the iron (II) ion residue onto the material affected the removal capacity. The use of an efficiently washed sample increased the removal capacity without iron (II) ion release. To increase the removal capacity, the adsorbent must have a larger microsurface area that has affinity to iron (II) ions.
