水解酸化-A^2O污泥减量工艺的运行性能研究

Study on operation performance of hydrolysis-acidification-A^2O sludge reduction process

生物处理单元采用水解酸化、多级串联接触曝气、连续流的除磷脱氮A2/O工艺,并辅以外排厌氧富磷污水侧流除磷,开发了一个新型的具有强化除磷脱氮功能的污泥减量HA-A/A-MCO工艺。用该工艺处理校园生活污水发现,在SRT60 d、进水COD 316~407 mg/L、NH4+-N30~40 mg/L、TN35~53 mg/L、TP 8~12 mg/L的条件下,出水COD≤18 mg/L、NH4+-N≤2.1 mg/L、TN≤10.3 mg/L、TP≤0.44 mg/L。研究还发现,水解酸化池处理产生的VFA能有效促进生物除磷脱氮,导致厌氧释磷量达57 mg/L,进入化学除磷池的侧流液量仅相当于进水量的13%;系统最主要的脱氮形式是SND和缺氧反硝化,SND脱氮占脱氮总量的50%,缺氧反硝化占26%;HA-A/A-MCO系统有效实现了生物相分离,并利用生物捕食作用获得较低的污泥产率,0.1 g MLSS/g COD。

An advanced process combining sludge reduction and phosphorous and nitrogen removal is de veloped, for short, HA-A/A-MCO process, whose biological treatment unit is hydrolysis-acidification, muhistep continuous oxic tank, and continuous flow A2/O process coupled with side stream phosphorous removal by drai- ning out anaerobic phosphorous accumulating sewage. Test results of the process treating campus wastewater show that under the condition of SRT 60 d, the influent COD 316 -407 mg/L, NH4-N 30 -40 mg/L,TN 35 -53 rag/L, TP 6 -9 rag/L, the effluent COD, NH4＋-N, TN and TP are equal to or less than 18 rag/L, 2.1 rag/L, 10. 3 mg/L, 0.44 mg/L, respectively. VFA from hydrolysis-acidification process can improve phosphorous and nitrogen removal effectively, which can induce phosphorous content from anaerobic release reaching 57 mg/L and can make the amount of sidestream phosphorous removal sewage flowing into chemical phosphorous removal tank be just 13% of influent flow. Nitrogen removal is realized by simultaneous nitrification and denitrification （SND） and denitrification, which account for 50% and 26% of the total nitrogen removal respectively. Moreover, biofacies separation is realized in HA-A/A-MCO process, and lower sludge yield which is 0. I g MLSS/g COD can be achieved by utilizing biological predation.