This study was conducted to verify and discuss the denitrifying dephosphatation under different levels of nitrate concentration and retention time of anoxic/aerobic process in a Sequencing Batch Reactor(SBR).The results of tests demonstrated that there were two kinds of phosph01MS-accumulating organisms(PAOs)in the biological excess phosphorus removal(BEPR)system．One was non-DNPAOs that could only use oxygen as terminal electron acceptors, the other was denitrifying PAOs(DNPAOs)that could use both nitrate and oxygen as terminal electron acceptors. Phosphorus uptake efficiency could be attained under anoxic period ranging from 28.7%-96.7% in an anaerobic/anoxic/aerobic system Experimental results showed that nitrate concentra-tion and retention time of anoxic/aerobic process were the key factors affecting the course of denitrifying dephos-phatation.

The aim of the research was to obtain both an excellent effluent for reuse and a reduced sludge production simultaneously by a combinaittion process of anaerobic phase and Membrane biroeactor (MBR)technology in treating domestic wastewater. During the experimental period of three months, excellent removals for COD, NH3-H,TN were obtained, and mean removals were 91.87%, 96.13%, and 69.23%, respectively. Whreas, at first 20 days, the removal for TP was only abut 15.87%. In The following days, about 30% of raw water was introduced into the anaerobic reactor to supply organics for denitrification and release of polyphosphate, then a significant improvement for TP removal was observed, and mean removal of TP increased to 76.35%. During the operational period, it was investigated that the permeate could meet the requirements of several water criteria for reuse except free chlorine, and a mean excess sludge yield coefficient of 0.137g MLSS/g COD was obtained. Therefore, the predicted goals of permeate for reuse and excess slu7dge reduction could be both achieved after dosing a certain quantity of disinfectant into the permeate.

The pilot perroamace of the alnbined GAC-MF mmlbrane process fordrinking water advanced treatment was described.In the process of GAC adsorption under the conditions of 20 mill HRT and 6m/h filtration rate, the rexnoval efficiencies of UV254% and trichioromethane could reach 40%and 50% respectively and the uv254 and trichloromethane in system effluent was less than 0.015 cm-1and 5ug/L respectively. In the post MF mcmbrane process, MF membrane effectively retained the particles and bacteria in raw water. The effluent turbidity was less than 0.2 NTU and no bacteria welag detected at all in permeate. A computer-controlled system was employed to control this system. The membrane operating par, ureters of backwash interval, duration and flux welag studied. The backwash interval of 10-min, 20-min and 60-min was researched respectively, and the variation of trans-membrane pressure was also analyzed.Consequently short backwash intervalwas recommended underthe samewater consume.

以固定化包埋硝化茵颗粒作为流化床的载体，以PVC弹性填料作为固定床的载体，使硝化茵分别以包埋和生物膜的形式与载体结合，通过试验对比了流化床和固定床去除水中氨氮的效果。结果表明，在相同条件下，流化床的硝化效率高于固定床的；两反应器内均存在亚硝酸盐氮积累现象，且流化床的积累浓度高于固定床的；COD及氨氮负荷的短期冲击对两反应器的硝化效果几乎不会产生影响；流化床中的包埋固定化硝化茵具有更强的抗温度变化能力；在反应器连续运行条件下，流化床和固定床对氨氮的去除率分别为96%和80%。

进行了以不同钙含量的粉煤灰为原料合成的3种沸石对污水中磷去除的试验，探讨了表面交换性阳离子种类、投加量以及磷浓度对除磷的影响。结果表明：最佳投加量为8g/L，磷去除率可达到70% 1，7，上。合成沸石除磷能力均高于粉煤灰，钙饱和处理又可明显进一步提高粉煤灰合成沸石的除磷效果。粉煤灰合成沸石钙含量越高，对磷的去除率越高。因此，采用高钙粉煤灰为原料合成沸石并进行钙饱和处理，可以获得除磷能力强的合成沸石材料。