A　chitosan　alginate　Fe-Mn　sludge　bead　(CAFB)　with　high　mechanical　strength　and　stability　was　prepared　by　chitosan　alginate　hydrogel,　embedding　iron-manganese　sludge　from　the　backwashing　wastewater　of　biofilter　for　iron　and　manganese　removal.　The　results　of　characterization　showed　that　it　had　mesoporous　structure　with　rough　surface　morphology　and　large　specific　surface　area　(117.20m2/g),　and　the　content　of　Fe　and　Mn　were　as　high　as　69.31%　by　EDS.　The　data　of　adsorption　kinetics　fitted　pseudo-second　kinetic　model　(R2=0.963)　well.　The　Langmuir　adsorption　isotherm　model　could　better　describe　the　As(V)　adsorption　behavior　with　R2=0.969.　Maximum　adsorption　capacity　was　15.80mg/g　at　25°C.The　acidic　condition　was　favorable　for　the　adsorption　of　As(V),　and　in　the　range　of　pH=3~7,　the　As(V)　removal　rate　could　reach　up　to　80%.　H2PO4　-,　SiO3　2-　had　obvious　suppression　on　As(V)　adsorption.　After　4times　of　regeneration　with　0.1mol/L　NaOH　solution,　the　adsorption　amount　could　still　reach　up　to　70.68%　of　the　initial　value.　In　conclusion,　CAFB　has　the　prospect　of　application　in　engineering.　©　2020,　Editorial　Board　of　China　Environmental　Science.　All　right　reserved.