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

本研究的目的是建立部分硝化处理的操作条件，开发部分硝化出水厌氧氨氧化处理系统。首先，采用网型腈纶生物质载体填料反应器，实验确定了部分硝化处理的操作条件。确定了部分硝化的最佳操作条件为35℃，反应器pH为7。5 - 7。NH4-N加载速率为0.5 kg-N/m3/d时，为7。我们发现，在实验规定的操作条件下，在一个反应器中可以成功地去除进水NH4-N。这一阶段NH4-N脱除工艺被称为厌氧氨氧化-部分硝化单阶段脱氮工艺（SNAP）。采用配备螺纹型丙烯酸生物质载体（游床反应器）的反应器，对猪粪厌氧甲烷发酵反应器中消化液进行了二次、部分硝化处理。由于高NH4-N浓度和高pH cf消化液，反应器中游离NH3浓度达到较高水平。高浓度的游离NH3对氨氧化菌有较强的抑制作用，可以在不调节反应器pH和温度的情况下进行部分硝化处理。利用厌氧氨氧化反应去除NH4-N，明确了在一个槽式反应器和两个分离的反应器系统中进行。两种系统均适用于城市污水处理系统的消化液等低NH4-N和SS含量的废水。猪舍废弃物消化液经部分硝化处理后仍有较高的SS含量，因此分离式系统是处理高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,