This　study　aimed　to　extract　orthophosphate　(ortho-P)　from　lipid-rich　waste　AF　liquor　(AFL)　by　Mg/Al　layered　double　hydroxides　(Mg/Al　LDHs)　adsorption,　evaluate　the　influence　of　carbonate　and　investigate　adsorption　mechanisms.　The　carbonate　influence　experiment　using　synthetic　P-rich　wastewater　indicated　that　low　carbonate　level　was　favorable　for　P　extraction　by　LDHs.　And　then,　real　AFL　rich　in　volatile　fatty　acids　(VFAs),　carbonate　and　ortho-P　was　applied　as　adsorbate　to　explore　the　Mg/Al　LDHs　adsorption　performance.　Experimental　results　indicated　that　4　g/L　Mg/Al　LDHs　could　extract　88.3%　of　ortho-P　from　the　AFL　with　low　carbonate　level　(4829.83　mg　CaCO3/L),　and　the　adsorption　quantity　was　62.99　mg　P/g　LDHs,　however,　negligible　VFAs　were　extracted.　Kinetics　and　mechanisms　analysis　indicated　that　adsorption　of　P　onto　Mg/Al　LDHs　was　a　rapid　physiochemical　process,　including　ion　exchange　and　surface　adsorption.　Finally,　the　nutrients　release　test　confirmed　the　slow　-release　property　of　intercalated　P.