电增强零价铁强化厌氧氨氧化反应器的启动特性

Start-up Characteristic of Anammox Reactor Strengthened by Electrically Enhanced Zero-valent Iron

针对厌氧氨氧化反应(Anammox)存在的启动时间长和厌氧氨氧化菌(AAOB)繁殖条件苛刻等问题,采用电增强零价铁/升流式厌氧污泥床反应器(EEZVI/UASB)强化Anammox技术处理养殖废水,考察了p H值和电压对启动的影响,分析了颗粒污泥粒径分布、污泥形貌和Fe2+溶出情况。结果表明,启动过程可分为四个阶段,即AAOB活性迟滞期、显现期、提高期和稳定期。电增强零价铁技术能够缩短Anammox启动时间,并实现了Anammox工艺的稳定、高效运行,对NH+4-N和NO-2-N的去除率均可达98%以上。

In order to deal with such problems as long start-up process of anaerobic ammonium oxidation （Anammox） and strict conditions for reproduction of anaerobic ammonium oxidizing bacteria （AAOB）, the electrically enhanced zero-valent iron/upflow anaerobic sludge blanket （UASB） reactor was adopted to strengthen the Anammox technology to treat the breeding wastewater. The effect of pH val- ue and voltage on the start-up was investigated, and the particle size distribution of granular sludge, sludge morphology and Fe2 ＋ dissolution were analyzed. The results showed that the start-up process could be divided into four stages, namely the lag, appearance, enhancement and stabilization of AAOB activity. The electrically enhanced zero-valent iron technology could realize the stable and efficient operation of Anammox process. The removal rates of NH4＋ - N and NO2- - N both could be over 98%.