Apparatus and method for cultivating high concentration alga by polluted water are provided. The apparatus for cultivating high concentration alga by polluted water has two membrane bioreactors, sludge aeration tank and alga aeration tank. The sludge aeration tank converts organic nitrogen in polluted water to inorganic nitrogen. Then, the filtered water of the sludge aeration tank is directed into the alga aeration tank to cultivate alga.提供一種高濃度藻類的污水培養裝置與方法。所提供之高濃度藻類的污水培養裝置具有污泥曝氣槽與藻類曝氣槽兩個薄膜生物反應器。先利用污泥曝氣槽將污水中的有機氮轉換成無機氮,接著將污泥曝氣槽過濾後的澄清液導入藻類曝氣槽中,供培養的藻類來利用。100‧‧‧污水培養裝置120‧‧‧藻類曝氣槽110‧‧‧污泥曝氣槽121‧‧‧第二濾膜111‧‧‧第一濾膜122‧‧‧第二原液區112‧‧‧第一原液區123‧‧‧第二濾液區113‧‧‧第一濾液區124‧‧‧第二進水管線114‧‧‧第一進水管線125‧‧‧第二進氣管線115‧‧‧第一進氣管線126‧‧‧第二出水管線116‧‧‧第一出水管線127‧‧‧照明燈118‧‧‧第一清洗管線128‧‧‧第二清洗管線119‧‧‧污泥排放管線129‧‧‧藻體排放管線130‧‧‧第一濾液暫存桶140‧‧‧第二濾液暫存桶150‧‧‧清水供應源
