水解酸化-A~2O污泥减量工艺的运行性能研究

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。

Study on operation performance of hydrolysis-acidification-A2O sludge reduction process

An advanced process combining sludge reduction and phosphorous and nitrogen removal is developed, for short, HA-A/A-MCO process, whose biological treatment unit is hydrolysis-acidification, muhistep continuous oxic tank, and continuous flow A~2/O process coupled with side stream phosphorous removal by draining 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 rag/L, NH_4~+ -N 30 ～ 40 mg/L, TN 35 ～ 53 mg/L, TP 6 ～ 9 mg/L, the effluent COD, NH_4~+ -N, TN and TP are equal to or less than 18 mg/L, 2. 1 mg/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 0.1 g MLSS/g COD can be achieved by utilizing biological predation.