The influence of different modification methods of oyster shells on phosphorus adsorption prop-erties were studied.The effect of different modified concentrations of AlCl3 on phosphorus removal in oys-ter shells was compared.The results showed that the phosphorus removal rate of 0.5 mol/L AlCl3 modified oyster shells was as high as 90％,and the phosphorus concentration of residual sewage after treatment was 0.05 mg/L.The study compared the treatment effects of natural oyster shells,hot-modified oyster shells and AlCl3 modified oyster shells on low-concentration phosphorus containing wastewater.The TP removal rate were 63％～68％,61％～72％and 83％～90％,respectively,and the TP removal rate of AlCl3 modified oyster shells were the highest.The adsorption of natural oyster shells,thermal modified oyster shells and AlCl3 modified oyster shells conforms to the quasi-second-order kinetic model and Freundlich isothermal adsorption model,and the adsorption process includes both physical adsorption and chemical adsorption.In the Freundlich isothermal adsorption model,parameter n values of natural oyster shell,hot-modified oyster shell and AlCl3 modified oyster shell were 1.205,1.168 and 2.611,respectively,indica-ting that the adsorption reaction of phosphorus on AlCl3 modified oyster shell was easier than that on natu-ral oyster shell and hot-modified oyster shell.
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