固化菌藻系统处理养殖废水中氨氮的研究

Study on the treatment of ammonia nitrogen in aquacultural wastewater by the immobilized algal-bacterial system

采用海藻酸钠-氯化钙固定法固化硝化细菌和硝化细菌与小球藻的混合物,来处理养殖废水中的氨氮污染,考察了处理时间、温度、p H和氨氮/固化小球用量比对氨氮去除效果的影响。实验结果显示,固化硝化细菌小球和固化菌藻小球均能有效去除废水中的氨氮,但固化菌藻小球的去除效果更佳。在28℃、p H=8、氨氮起始质量浓度为50 mg/L、氨氮/固化菌藻小球用量比为1∶40的实验条件下,24 h内能去除废水中96.51%的氨氮。实验结果证实,硝化细菌和小球藻具有一定的共生关系,在去除氨氮时有协同效应,固化菌藻小球在养殖废水脱氮中具有一定的应用前景。

Solo nitrifying bacteria and the mixture of nitrifying bacteria and chlorella immobilized by sodium alginate and CaCl2 have been used for treating the ammonia nitrogen pollution in aquacultural wastewater. The influences of treatment time, temperature, pH and the dosage ratio of ammonia nitrogen/immobilized balls on the removing effects of ammonia nitrogen are investigated. The experimental results show that these immobilized balls （solo nitrifying bacteria and the mixture of nitrifying bacteria and chlorella） can effectively remove ammonia nitrogen from aquacultural wastewater. However, the removing effect of the immobilized bacteria-algal balls are better. Under the following conditions ： temperature is 28 ℃, pH 8, initial ammonia nitrogen mass concentration 50 mg/L and dosage ratio of ammonia nitrogen/immobilized bacteria-algal balls 1：40,95% of ammonia nitrogen can be removed in 24 hours. These results show that nitrifying bacteria and chlorella have certain symbiotic relationship,and synergistic effect occurs while ammonia nitrogen is being removed. Therefore, the immobilized bacteria-algal balls applied to the denitrification in aquacultural wastewater have certain application prospects.