The removal effects of different compounding types and different compounding ratios on turbidi-ty,sand content and particle size of supernatant in wastewater with high sand concentration were studied.Meanwhile,these compounds were applied to the actual wastewater of wastewater treatment plant to ob-serve the changes of suspended solid concentration,turbidity of supernatant,sand content,particle size,COD,TN,TP and pH.The results showed that the sand removal effect was improved by using the com-pound flocculant compared with the single flocculant.Under the synergistic action of 15 mg/L cationic polyacrylamide and 15 mg/L chitosan,the average removal rate of SS reached 55.8％,the average remov-al rate of sand content in water increased to 72.7％,the average removal rate of TN increased to 41.1％,the average removal rate of TP increased to 70.5％,the average removal rate of COD increased to 49.7％,and the ratio of sand content to total suspended solids decreased by 15.5％.
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