摘要
针对污泥减量技术中对氮、磷去除能力低的问题,开发了一种具有强化脱氮除磷功能、污泥减量化的HA-A/A-MCO工艺,其通过回流释磷污泥的水解酸化来刺激磷的厌氧释放并辅以外排富磷污水进行化学固定的方式除磷。研究发现:当进入水解酸化池的厌氧释磷污泥量为进水量的2%时,水解产生的VFA导致释磷量达57 mg/L,聚磷菌的生长得到促进而聚糖菌则受到抑制;当控制侧流除磷液量为进水量的13%、化学除磷池出水磷为5 mg/L时,系统处理出水TP<0.5 mg/L;提高厌氧释磷浓度并控制化学除磷池的出水磷浓度为5 mg/L,可以提高化学药剂利用率、减少药剂用量并提高化学污泥的含磷量,HA-A/A-MCO系统产生的化学污泥含磷率高达18%,接近纯含磷化合物的含磷率,可直接用作生产磷肥的原料。
In order to improve phosphorous and nitrogen removal in sludge reduction technologies, an advanced process combining excess sludge reduction and phosphorous and nitrogen removal was developed. It is the hydrolysis acidification-anaerobic/anoxic-multistep continuous oxic （HA-A/A-MCO） process. It realizes phosphorous removal through the hydrolysis acidification of returned P-release sludge, which improves anaerobic P-release level, and through discharging phosphorus-rich sewage. The results show that when the amount of anaerobic P-release sludge entering the hydrolysis acidification tank is about 2% of the total influent fow, VFA from hydrolysis acidification process is able to induce phosphorus content reaching 57 mg/L from anaerobic release. Meanwhile, the growth of phosphate-accumulating organisms （PAOs） in the system is improved greatly while that of glycogen-accumulating organisms （GAOs） is inhibited. When the amount of side-stream phosphorus removal sewage is 13% of the total influent flow, and the effluent phosphorus content of the chemical phosphorus removal tank is 5 mg/L, the effluent TP of the system is less than O. 5 mg/L. Moreover, increasing the phosphorus content from anaerobic release and controlling the effluent phosphorus content of the chemical phosphorus removal tank to 5 mg/L can improve the efficiency of chemicals, reduce the amount of chemicals required and increase the phosphorus content in chemical sludge. The phosphorus content in chemical sludge in the HA-A/A-MCO system reaches up to 18%, which is equivalent to the content in the phosphorus compound. The phosphorus can be recycled as raw material for production of phosphorus fertilizer.
出处
《中国给水排水》
CAS
CSCD
北大核心
2009年第15期29-33,共5页
China Water & Wastewater
基金
科技部国际合作项目(2007DFA90660)
重庆市重大科技专项(CSTC2008AB7133)
关键词
HA—A/A—MCO工艺
污泥减量化
水解酸化
化学除磷
磷回收
HA-A/A-MCO process
sludge reduction
hydrolysis acidification
chemical phosphorus removal
phosphorus recovery
