A Study on the Structure and Behavior of Sinter-free Material for Phosphorous Removal from Waste Wat

Oyster shell and cement were taken as the major raw materials to fabricate hollow,tubular and recoverable material for phosphorous removal(P removal)from waste water without sintering.In this paper,the effects of different affecting factors on the sample P removal ratio were discussed to select optimal P removal process conditions.SEM and XRD were used to characterize the microscoplc structures and composition of samples,and molybdenum blue spectrophotometry was applied to determine the P content in waste water.Results showed that at 30℃ for 2 d.the P removal ratio reached 93.3% when the cement content was 10 wt%and oyster shell powder Was 90wt%.SEM analysis revealed a flaky structure consisting of phosphorus-containing compound in the samples after P removal,and it piled on and maintained the porous structure.In addition,the results also suggested that raising the ambient temperature was benefit to the P removal.The P removal ratio of the material was optimal under neutral and alkali conditions.