4种固定化藻类对污水中氮的净化能力研究

取培养至对数末期的藻，采用海藻酸钙凝胶包埋固定，对人工污水进行静态模拟净化试验，研究了蛋白核小球藻、鱼腥藻、双对栅藻和突变衣藻4种藻在固定和悬浮状态下，对污水中的氨氮和硝酸氮的净化效率以及藻类的生长特性。结果表明：固定化藻细胞比悬浮态藻细胞具有生长更趋于稳定、藻类的活性保持时间更长的优势。4种藻类中，小球藻和鱼腥藻在污水中的生长状况更好，较适宜采用海藻酸钙凝胶包埋固定化技术。实验第5 d时，固定化小球藻、鱼腥藻、双对栅藻和衣藻对NH₃-N去除率分别为91.9%、84.8%、68.3%和51.2%；对NO^-₃-N的去除率分别为85.1%、100%、96.9%和65.9%。固定化小球藻对NH₃-N的去除效果最好，而固定化鱼腥藻对NO^-₃-N的去除效果最好。因此，小球藻和鱼腥藻更适用于去除污水中的氮，具有很好的应用前景。

Nitrogen removal from wastewater by four species of immobilized algae

Removal of nitrogen from wastewater by three species of green algae and one specie of blue-green alga ( Chlorella pyrenoidosa,Chlamydomonas mutabilis,Anabaena sp. and Scenedesmus bijuga ) was investigated using calcium alginate embedded algae and also experiments on algae growth were conducted. Results showed that high viability and a longer lag period were observed with immobilized cells than those with the suspending ceils. The growth stabilities of immobilized ChloreUa pyrenoidosa and Anabaena sp. were better than that of the others. The removal efficiency of NH_3~+-N by immobilized Chlorella pyrenoidosa,Anabaena sp.,Seenedesmus bi-juga and Chlamydomonas mutabilis was 91.9%,84.8%,68.3% and 51.2% and the removal efficiency of NO_3~-N was 85.1%,100%,96.9% and 65.9% respectively on the 5~(th) day. It was concluded that immobiliza-tion of Chlorella pyrenoidosa and Anabaena sp. was an effective way to reduce nitrogen in wastewater treatment.