The preparation of the ecological ceramsite based on iron-manganese sludge and its performance on phosphate removal from water
The ecological ceramsite based on iron-manganese sludge was successfully prepared using the sludge from the filter for removing Fe and Mn,kaolin,biomass,and calcium oxide etc..Its structural characteristics and performance on phosphorus adsorption from water were investigated.The results show that the ceramsite prepared with a 30％addition of iron-manganese sludge at sintering temperature of 900 ℃had the best performance.When the initial concentration was 3.0 mg·L-1 and the dosage of ceramsite was 7.45 g·L-1,the removal rate of phosphorus could reach 96.79％.The results of adsorption kinetics indicate that the removal process of phosphorus from water by the ceramsite fitted with the pseudo-second-order model;the simulation of the intra particle diffusion model shows that the adsorption rate of phosphorus was depended on both surface and intra particle diffusion;the adsorption isotherm experiments show that Freundlich model could better describe the adsorption process of phosphorus.FTIR,XPS and other characterizations suggest that the surface hydroxyl groups of the ceramsite based on iron-manganese sludge mainly contributed to effective phosphate adsorption from water.
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