In　the　process　of　bio-filter　backwash　for　biological　iron　and　manganese　removal　from　groundwater,　a　large　quantity　of　sludge　rich　in　iron　and　manganese　oxides　was　produced,　and　was　trying　to　be　used　as　an　arsenic　removal　adsorbent　to　avoid　pollution　caused　by　its　direct　emission.　The　sludge　was　characterized　after　pretreatment　using　XRD　and　TEM,　and　its　adsorption　properties　and　related　mechanism　were　studied　through　the　static　adsorption　experiments.　The　results　show　that　the　sludge　of　iron　and　manganese　oxides　is　non-setting　structure　with　small　particle　size　and　large　specific　surface　area.　The　Langmuir　isotherm　equation　is　more　in　line　with　the　adsorption　characteristics　of　As(V)　(R2＞0.99),　and　As　(III)　adsorption　behavior　cannot　be　simulated　by　a　single　model.　The　maximum　adsorption　capacity　for　As　(III)　and　As(V)　is　36.53　mg/g　and　40.37　mg/g　respectively,　and　the　adsorption　capacity　increases　with　the　increase　of　the　temperature.　The　adsorption　of　As　(III)　and　As(V)　conforms　to　the　pseudo-second　order　kinetic　model　with　R2　more　than　0.99,　and　As(V)　adsorption　capacity　decreases　gradually　with　the　increase　of　pH,　while　As　(III)　adsorption　capacity　experiences　a　process　of　decrease　and　increase　and　then　decrease.　H2PO4-　and　SiO32-　has　significant　inhibition　on　arsenic　adsorption　and　other　ions　have　little　effect　on　the　adsorption　process.　©　2018,　Editorial　Board　of　Journal　of　Harbin　Institute　of　Technology.　All　right　reserved.