生物沸石球强化吸附氨氮废水的动力学研究

用一种具有多孔结构特征的沸石球作为载体固定化硝化细菌强化吸附氨氮废水。结果表明,沸石球能快速固定化硝化细菌,吸附动力学表明150 min对氨氮吸附容量达到2.816 mg/g,而且还有继续增加的趋势。假二级动力学方程和Elovich模型的精确拟合说明,生物沸石球对氨氮的吸附过程可能是非均相扩散起作用及以化学吸附反应为主的复杂转化过程。扩散拟合结果表明,氨氮在生物沸石球的吸附是以液膜扩散和颗粒内扩散为吸附速率的控制步骤,活性的硝化细菌对氨氮的硝化使氨氮在微孔的吸附得到了强化。

Kinetic study of adsorption enhancement on ammonia nitrogen wastewater by biological zeolite ball

The adsorption enhancement of ammonia nitrogen wastewater was conducted using an immobilized nitrifying bacteria zeolite small ball(ZSB) carrier with the characteristics of porous structure. The results showed that the ZSB can fastly immobilize nitrifying bacteria, the adsorption kinetics illustrates that the ammonia nitrogen adsorption capacity can reach 2.816 mg/g at 150 min and have a continuous increasing trend. Pseudo second-order equation and Elovich model can precisely fit the adsorption processes, which suggest that biological zeolite small ball (BZSB) could be a complex conversion process coupling with heterogeneous diffusion and chemical adsorption reaction. The fitting results indicate that the adsorption rate limiting step of ammonia nitrogen by BZSB are both liquid film diffusion and intra-particle diffusion, the adsorption of ammonia nitrogen in micropore are strengthened by the nitrification of ammonia by active nitrifying bacteria.