Aquaculture　tailwater　with　excessive　phosphorous　can　easily　lead　to　eutrophication　of　receiving　water　body.　The　existing　treatment　methods　have　disadvantages　such　as　secondary　pollution,　high　cost,　and　poor　stability.　Biochar　as　a　low-cost　adsorbent　for　phosphorus　removal　has　been　extensively　studied,　while　basic　data　on　the　treatment　of　actual　aquaculture　tailwaters　using　biochar　are　lacking.　Herein,　four　biochars,　i.e.,　wood　biochar(WBC),　vancomycin　fermentation　residue　biochar(VBC),　eel　manure　biochar(MBC),　and　seawater-modified　wood　biochar(SBC),　were　prepared.　Meanwhile,　the　phosphorus　removal　effects　on　three　actual　aquaculture　tailwaters　(freshwater,　concentrated　and　marine　tailwaters)　were　investigated.　The　results　showed　that　the　removal　efficiency　of　total　phosphorus　by　the　biochars　increased　with　the　increase　of　dosage.　Among　them,　SBC　exhibited　the　best　adsorption　performance,　followed　by　VBC.　WBC　was　less　capable　of　removing　phosphorus,　while　MBC　could　not　adsorb　but　even　release　phosphorus.　The　adsorption　of　phosphate　in　three　tailwaters　by　SBC　reached　equilibrium　at　30-60　min　with　the　removal　rate　of　76.78%-93.07%,　while　the　removal　rate　of　organic　phosphorus　was　as　low　as　14%-17%.　The　kinetic　data　for　different　forms　of　phosphorus　could　be　well　fitted　by　the　pseudo-second-order.　The　adsorption　mechanism　of　phosphate　by　SBC　primarily　included　ligand　exchange　and　chemical　precipitation.　This　study　is　expected　to　provide　guidance　for　the　treatment　of　actual　phosphorus-containing　wastewater　by　biochars　and　promotes　biochars　and　modified　biochars　from　basic　research　to　practical　application.　©　2024　Editorial　Office　of　Industrial　Water　Treatment,　CNOOC　Tianjin　Chemical　Research　and　Design　Institute　Co.,　Ltd.　All　rights　reserved.