A staged anaerobic and aerobic membrane bioreactor (MBR) was constructed. The membrane module was submerged in the aerobic zone of the reactor, and was operated under the mode of alternative suction and air backwash. Air backwash and aeration around the membrane module served as the cleaning of the membrane, resulted in the steady operation of the reactor at the flux of 5-14lm−2 h−1 for up to 200h without any additional cleaning. The efficiency of COD removal was more than 99% at up to 10.08g CODl−1 per day of the volumetric loading rate (VLR). The efficiency of ammonium removal was 100% at a VLR of 0.18g NH4+-N l−1 per day. Sixty to 80% of COD was anaerobically biodegraded in the anaerobic zone of the reactor and this produced a great amount of methane. Methane passed to the aerobic zone of the reactor and could serve as a carbon source for denitrification. Intermittent aeration allowed nitrification and denitrification to occur simultaneously in the aerobic zone of the reactor. The capacity for ammonium removal reached up to 0.5g NH4+-N l−1 per day. Eighty-four to 94% of the total oxidised nitrogen converted from the oxidisation of ammonium was denitrified.

利用自行开发的活性污泥2号模型ASMNO.2计算机模拟程序对重庆市某污水厂三种脱氮除磷改造方案（APO，A2PO，倒置A2PO）进行了模拟研究，寻求了每一种方案的最佳运行控制参数。结果表明:（1）将现有曝气池前端1P4控制为缺氧而形成APO工艺，缺氧区溶解氧浓度为0.10mgPL，混合液内回流比为100%，可以使TN去除率达到58.6%，提高24个百分点，TP基本不受影响；（2）将现有曝气池前端12%控制为厌氧区，24%控制为缺氧区，缺氧区溶解氧浓度为0.10mgPL，混合液内回流比为100%，可以使TN去除率达到62.1%，提高约28个百分点，TP去除率达到78.3%，提高37个百分点；（3）倒置A2PO工艺与常规A2PO工艺的出水水质基本相当，但倒置A2PO工艺在工程实践中更易于实现；（4）三种工艺出水COD和氨氮均能达到国家规定的一级排放标准。

用普通活性污泥经120d富集，得到氨氧化菌混培物，氨氧化菌浓度提高300倍。在NO2/O2混合气氛下进行氨氧化试验，结果表明，无分子氧时，氨氧化菌能以NO2为电子受体氧化氨，并产生NO；加入氧气后，氨氧化速率明显提高，最高速率[33µmol NH4+-N/（gMLSSh）]发生在混合气体中NO2和O2浓度分别为1.79µmol/L和9.38mmol/L时；在NO2浓度为0.89-1.79µmol/L范围内，O2能够强化基于NO2的氨氧化反应，但随着NO2浓度增大至6.71µmol/L，氨氧化速率却降低。部分NO被O2氧化，使得反应器出口气体中NO2浓度高于进口。试验过程中产生了最大约20%氮损失，这与氨氧化和厌氧氨氧化相互耦合产生气态含氮产物（N2、NO、N2O）有关。

将简化的活性污泥模型ASM3与传质反应方程相耦合，建立了生物膜多基质模型（BMSM），在其基础上，运用均相生物膜反应单元概念，导出了曝气生物滤池（BAF）反应器一维模型，模型方程表明，出水基质浓度与生物膜表面积相关，与反应器体积无关；灵敏度分析结果表明，出水水质对大部分动力学参数灵敏度较低，对生物膜参数如表面积、膜厚、活性附着生物量等灵敏度较高，进行了以陶球为滤料的BAF处理合成生活污水实验，测定了生物膜膜厚、生物膜干密度、生物膜面积。用Matlab语言对BAF的稳态运行进行模拟，考察了COD、NH4+-N、NO3--N沿填料高度浓度上的变化。结果表明，建立的BMSM能较好地模拟BAF的稳态运行。