1. 无论是校园试验装置，还是酒店的工程装置均表明膜生物反应器适合于处理生活污水，具有工艺简单全自动运行的特点。经历了长达一年连续运行的考验，表明装置的设计是成功的，其主要设计和运行参数可作为工程应用的参考。

2. 试验结果表明膜生物反应池出水水质稳定，处理深度好于普通生物处理，SS在常规检测范围为零，COD平均值< 20mg/ L，平均去除率为91%，出水可以达到回用水的水质标准。对污水中有机物的去除是活性污泥和膜共同作用的结果，其中活性污泥中的微生物对COD的平均去除率为80.4%，膜截留对COD的平均去除率为10.6%。

3. 膜生物反应器对氨氮有出色的去除效果。出水中的氨氮的平均值< 2.9mg/ L，对氨氮的平均去除率为88.7%，其中活性污泥中的微生物对氨氮的平均去除率为80.0%，膜截留对氨氮的平均去除率为8.7%。对氨氮的平均去除效果与污泥停留时间有关，由于膜生物反应器通常不排泥，运行时间越长，去除效果越好，这与硝化菌的积累和繁殖有关，随着运行时间的延长，硝化菌浓度增加。

4. 对含氮化合物在膜生物反应器中的举动分析表明，总氮、氨氮浓度在处理过程中有明显的下降，硝态氮浓度大幅度上升，亚硝态氮浓度基本不变。这表明在膜生物反应器中有机氮发生了氨化作用, 转变成了氨氮，氨氮发生了硝化作用被亚硝酸菌氧化为亚硝态氮，由于不稳定，很快被硝酸菌氧化成硝态氮。

5. 膜的清洗是克服膜污染、保证系统稳定运行必不可少的一个措施。物理清洗操作方便，并能一定程度地恢复膜通量，无论是空气反冲洗还是清水反冲洗，每次冲洗时间长达2h，维持运行时间只有4-10d。化学清洗效果好于物理清洗，试验结果表明人工拆卸膜组件，反应池外浸泡的方法是可行的，首先用2.5%的NaOCl + 1%NaOH溶液浸泡膜组件，然后用1%的硫酸溶液浸泡，膜通量恢复良好,能维持约50d的连续运行。

此外，鉴于目前国内对MBR系统的工艺设计还没有统一的方案，本论文阐述了如何设计一套MBR系统，并给出了完整的电气设计图和自动控制程序，其主旨在于起到一个抛砖引玉的作用，希望能对MBR工艺的大规模应用尽一点微薄之力。

(1) The experimental equipment on campus and the project equipment in the hotel prove MBR system is very suitable for disposing domestic wastewater through simple process and fully automatic running. One-year continuous operation shows the design of the equipments are successful and the design and operating data can be used as references for other projects.

(2) Experimental results show the quality of effluent is not only steady but also better than ordinary biomass-treating methods. Suspended solid (SS) is usually zero under normal tests. The concentration of COD in the effluent of MBR system is below 20mg/L and meets the standard for water reuses. MBR system’s average efficiency of removing organic substances is 91%, in which 80.4% is ascribed to biomass. and 10.6% is ascribed to membrane.

(3) MBR system has good characteristics for removing NH4＋-N. The average concentration of NH4＋-N in the effluent of MBR system is below 2.9mg/L.MBR system’s average efficiency of removing NH4＋-N is 88.7%, in which 80.0% is ascribed to biomass, and 8.7% is ascribed to membrane. The average results of removing NH4＋-N is relevant to sludge retention time(SRT). And the removal will be better with longer running time because MBR system usually doesn’t discharge any sludge plus the concentration of nitrifying bacteria will be higher with the increase of time.

(4) Analysis on various nitrogen chemicals show that the concentration of TN and NH4＋-N will decrease dramatically and the concentration of NO3--N increases substantially, while the concentration of NO2--N basically changes little. It proves organic substances in MBR can be converted into NH4＋-N then into NO2--N with nitrification and finally into NO3--N as the combination of NO2--N is not stable.

(5) Cleaning membrane is a necessary step to solve the problem of membrane fouling and assure the system’s steady running. Physical cleaning methods can be operated conveniently and rehabilitate the membrane flux to a certain extent. The time required with on-line air backwashing or on-line water backwashing is about 2 hours and the operation can maintain 4 to 10 days only. Chemical methods will be better than physical methods. The experimental results show that it is acceptable to dismantle contaminated membrane manually and submerge it into chemical solutions. The flux can be rehabilitated perfectly and last for about 50 days through submerging contaminated membrane into the solution with 2.5% of NaOCl plus 1% of NaOH firstly then into the solution with 1% of H2SO4 secondly .

Furthermore, as there is no criteria on the MBR system design, the dissertation specifies one way to make MBR system and presents a complete set of electrical drawings and automatic controlling procedure in order to make a little contribution for the wide use of MBR system.