一体式膜-生物反应器降低能耗的中试试验

Pilot studies on reducing energy consumption of submerged membrane bioreactor.

基于气升式内循环反应器原理,对一体式膜-生物反应器结构进行了优化设计,构建了处理量为15.6m3/d的中试装置.通过水动力学特性的考察,得到中试装置的经济曝气强度为96m3/(m2·h);通过经济曝气强度条件下的临界通量试验,得到污泥浓度小于13g/L时的膜临界通量区域为30～35L/(m2·h).由此确定了中试装置连续运行的操作参数,实现了次临界通量[30L/(m2·h)]条件下处理城市污水的稳定运行.能耗分析显示,该中试反应器的气水比为21:1,有效单位产水能耗为0.42kW·h/m3.

A pilot-scale submerged membrane bioreactor with treating capacity of 15.6 m3/d was developed on the basis of its structural optimization design according to the principle of air-lift internal-loop reactor. Economical aeration intensity of this installation was 96 m3/(m2·h) according to hydrodynamic investigation. Through critical flux test under the condition of economical aeration intensity, critical flux region of the membrane was 30-35 L/( m2·h) when the sludge concentration was less than 13 g/L. Therefore the operation parameters of continuous motion of the pilot installation was determined and under the condition of sub-critical flux of 30 L/( m2·h stable motion of sewage treatment was realized. Energy consumption analysis indicated that the air-to-water ratio of the pilot reactor was 21:1 and the effective unit energy consumption was 0.42 kW·h/m3.