一体式膜生物反应器同步硝化反硝化性能研究

构建了气升循环一体式膜生物反应器,将其用于处理城市污水,并对其同步硝化反硝化(SND)的形成过程进行了研究。结果表明,反应器内存在明显的好氧区和厌氧区,并利用曝气推动力实现硝化液在各区间的循环,能够形成良好的硝化和反硝化过程;在反应器结构一定的条件下,曝气强度成为制约溶解氧大小和分布的最主要因素,过大或过小的曝气强度对TN的去除都是不利的,当曝气强度控制在50~70 m3/(m2.h)时,系统对TN的去除效果最好,去除率为48.1%~54.0%,实现了较好的同步硝化反硝化效果。

Performance of Simultaneous Nitrification and Denitrification in Submerged Membrane Bioreactor

A submerged membrane bioreactor (SMBR) with airlift loop was designed to treat municipal wastewater.The formation process of simultaneous nitrification and denitrification (SND) was investigated.The results show that in the reactor, the aerobic and anaerobic zones exist, and the nitrifying liquid can circulate between the zones by the airlift power to form good nitrification and denitrification process.Under a given reactor structure, the aeration intensity is the most important factor for restricting DO level and distribution, and excessive or insufficient aeration intensity are all unfavorable for total nitrogen removal.When the aeration intensity is 50 to 70 m~3/(m~2·h), the removal efficiency of total nitrogen is the best, and the removal rate is 48.1% to 54.0%.Good efficiency of SND is achieved.