Development of New Nitrogen Removal Process By the Combination of Partial Nitritation and Anammox

本研究的目的是确定部分亚硝化处理的运行条件，开发厌氧氨氧化处理部分硝化出水的系统。首先，采用网状聚丙烯腈纤维生物质载体填充式反应器，通过实验确定了部分亚硝化处理的运行条件。确定了部分亚硝化的最佳操作条件为35℃，反应器pH值为7.5~7。7在NH4-N负荷率为0.5 kg-N/m~3/d的条件下，在实验确定的运行条件下进行了部分硝化的长期稳定性试验，发现进水NH4-N在一个反应器中可以被成功去除。这种单级脱氮工艺称为厌氧氨氧化-部分亚硝化单级脱氮工艺(SNAP)。采用螺纹型丙烯酸类生物质载体(游床反应器)对猪粪厌氧甲烷发酵反应器的消化液进行了二次部分亚硝化处理试验。由于消化液NH4-N浓度高，pH值高，反应器内游离NH3浓度达到较高水平。高浓度的游离NH3对氨氧化细菌有很强的抑制作用，因此不需要调节反应器的pH值和温度就可以进行部分亚硝化处理。厌氧氨氧化反应去除NH4-N可以同时在一个釜式反应器和两个独立的反应器系统中进行。两种系统均可适用于城市污水处理系统消化液等氨氮和悬浮物含量低的废水。猪场粪便消化液经过部分亚硝化处理后，SS含量仍然较高，因此分离系统是处理高NH4-N和SS含量废水的首选系统，

The objects of this research were to establish the operational conditions for partial nitritation treatment ard to develop the anammox treatment system for partial nitrified effluent.Firstly, operational condition for partial nitritation treatment was experimentally determined using the reactor packed with net type acrylic fiber biomass carrier. Optimum operational condition for partial nitritation was determined to be 35℃ and reactor pH 7. 5-7. 7 under NH4-N loading rate of O.5 kg-N/m3/d. We found that influent NH4-N could be removed successfully in one reactor during the long term stability test for partial nitirtation under experimentally defined operational condition. This one stage NH4-N removal process was named as Single Stage Nitrogen Removal using Anammox and Partial Nitritation (SNAP). Secondary, partial nitritation treatment of digestion liquor from anaerobic methane fermentation reactor of pig manure was examined using the reactor equipped the thread type acrylic biomass carrier (swim bed reactor). Owing to the high NH4-N concentration and high pH cf digestion liquor, free NH3 concentration in the reactor reached to high level. Ammonia oxidizing bacteria was strongly inhibited by this high level of free NH3 concentration, so that partial nitritation treatment was possible without any adjustment of reactor pH and temperature. NH4-N removal using anammox reaction was made clear to carry both in one tank reactor and separate two reactors systems. Both systems were possible to apply for low NH4-N and SS content wastewaters like digestion liquor of municipal wastewater treatment system. There remains high SS content after partial nitritation treatment of digestion liquor of piggery waste, so that separate system was revealed to be a preferred system for high NH4-N and SS content wastewater,