固定化硝化细菌耐低温机理的研究

氨随污水排入水体．不但能诱发“富营养化”，造成水生生态系统紊乱，而且还有如下危害：(1)消耗溶解氧，导致水体缺氧；(2)影响鱼鳃的氧传递，严重时使鱼类死亡；(3)与氯气作用生成氯胺，妨碍氯化消毒处理^1]。对于氨污染的控制．目前国内外主要采用生物脱氮技术。即硝化．反硝化工艺^2]。由于硝化细菌生长缓慢(在低温下则生长更慢)．一些学者作了固定化细胞的尝试．以期持留足量的生物体，改瞢生物反应器的运作性能^3,4]。研究发现，固定化硝化细菌具有较强的耐低温能力^4]。这对含氨废水的冬季生物处理十分有益。本文拟就固定化细胞的耐低温机理作一探讨。

Mechanism Study of Tolerance of Immobilized Nitrifying Bacteria Towards Low Temperature

Immobilized Nitrosomonas europaea and Nitrobacter agilis were found to be less sensitive to low temperature than their suspended cells. In order to explore its mechanism, activation energies for the maximum specific respiration activity, for the Monod constant and for the oxygen diffusion in carrageenin were determined and compared. It was shown that both the effect of diffusion limitation and the effect of temperature on the Monod constant were responsible for the better tolerance towards low temperature.