Abstract:Nannochloropsis oculata，Cryptomonas erosa and Oscillatoria chlorine were seperately or co-cultured in inorganic culture solutions,and the consumption of nitrogen and phosphorus during the culturing was analyzed. The results showed that the absorption ability of O.chlorine on nitrogen and phosphorus was the highest, and that of C.erosa was the lowest. The nitrogen consumption by O.chlorine, N. oculata, and C. erosa were 13.496, 7.533, and 6.739 mg/L respectively at the tenth day, and that of phosphorus were 2.165, 0.581, and 0.510 mg/L, respectively. The effect of the microalgae co-culturing was investigated by the path analysis method. The results showed that the absorption of nitrogen and phosphorus by them both increased, indicating that the interaction of N. oculata and O. chlorine was positive. When N. oculata and C. erosa were co-cultured, N. oculata played a dominant role in utilization of nitrogen and phosphorus. However, the nitrogen and phospborus utilization ability of C. erosa was significantly (P<0.05) inhibited by O. chlorine.
