On　the　basis　of　reviewing　the　resource　utilization　of　sludge　in　water　supply　plants,　this　paper　summarizes　the　application　of　iron　sludge　from　water　plants　using　iron　and　manganese　containing　groundwater　as　water　source.　This　iron　sludge　is　generated　in　the　backwashing　process　of　the　filters　for　biological　iron　and　manganese　removal.　It　has　large　specific　surface　area　and　the　main　component　is　γ-FeOOH,　which　has　a　high　affinity　for　arsenic,　a　common　water　pollutant　with　strong　toxicity.　Therefore,　the　removal　of　arsenic　from　water　can　be　achieved　through　this　sludge.　What＇s　more,　the　sludge　is　modified　to　prepare　magnetic　adsorbents　and　granular　adsorbents,　in　order　to　solve　the　problem　that　it　cannot　easily　be　separated　from　water　after　use.　This　manuscript　mainly　summarizes　the　development　of　arsenic　removal　technology　by　iron　sludge.　Various　types　of　arsenic　removal　adsorbents　are　introduced　in　detail.　It　provides　a　reference　for　both　the　utilization　of　iron-manganese　sludge　and　the　removal　of　arsenic　from　water.　Also　at　the　end　the　existing　problems,　possible　solutions　and　difficulties　in　engineering　application　are　discussed.　©　2022　Elsevier　Ltd.