中文摘要：

采用52L以厌氧／缺氧／好氧为污水处理工艺（A^2O）的试验装置处理人工合成废水，研究了A^2O工艺中出现污泥膨胀的原因及控制措施．结果表明，系统在稳定状态下，好氧区DO平均浓度约为1．08mg／L时，COD、NH4^＋ -N、TN以及PO4^3- -P的平均去除率分别为86．8％、97．5％、86．5％和95．5％，但污泥的沉降性能受到很大影响，其SVI从最初的130．1mL／g升至265．8mL／g，并有继续上升的趋势，引起污泥膨胀．当好氧区DO平均浓度提高至2．16mg／L时，污泥的沉降性能得到部分改善，SVI降至约200mL／g．在好氧区首端引入15％的原水旁流，经过30d的运行，SVI降低至100mL／g左右，污泥膨胀得到恢复．说明好氧区偏低的有机负荷是引起污泥膨胀的主要原因．单纯提高好氧区的DO浓度并不能有效控制污泥膨胀，控制A^2O中污泥膨胀的关键在于对有机负荷的合理分配．

英文摘要：

A 52L pilot-scale biological nutrients removal system, based on anaerobic/anoxic/oxic （A^2O） configuration, was used to investigate the sludge bulking and control when treating synthetic wastewater. Good biological nutrients removal performance could be achieved when the average DO was 1.08mg/L in the oxic zone and the removal efficiency of COD, NH4^＋-N, TN and PO4^3 -P were 86.8%, 97.5%, 86.5% and 95.5%, respectively. But sludge settle characteristics deteriorated during this period and SVI increased from 130.1mL/g to 265.8mL/g, causing severe sludge bulking. When average DO concentration inoxic zone from increased 1.08mg/L to 2.16rag/L, the sludge settle characteristics was improved but the SVI was still around 200mL/g. To further control sludge bulking, a bypass flow 05% of influent flow rate） was induced to the beginning of oxic zone. The sludge bulking was controlled and the SVI was about 100mL/g after 30 days operation. Low organic loading rather than DO concentration in the oxic zone was the major factor for sludge bulking and the appropriate distribution of organic loading along the tank was the best way to control sludge bulking in A^2O process.