Laboratory of Chemical and Environmental Engineering (LEQUIA-UdG), Facultat de Ciències, Institute of the Environment, University of Girona, Campus Montilivi s/n, E-17071, Girona Catalonia, Spain.
Water Sci Technol. 2010;61(4):1065-71. doi: 10.2166/wst.2010.610.
Heterotrophic denitrification coexists with the anammox process contributing to N removal owing to the biodegradable organic matter supply from urban landfill leachate and the decay of microorganisms. Both biomasses consumed nitrite increasing the nitrite requirements of the system. The aim of this paper is the study of the causes which induce the system to decrease nitrogen removal efficiency. In this study, urban landfill leachate has been treated in an anammox Sequencing Batch Reactor (SBR) for 360 days. The anammox reactor treated on average 0.24 kgN m(-3) d(-1) obtaining nitrogen removal efficiencies up to 89%. The results demonstrated that i) a suitable influent nitrite to ammonium molar ratio is a crucial factor to avoid troubles in the anammox reactor performance; ii) an excess of nitrite implied nitrite accumulation in the reactor; iii) a lower nitrite supply than the necessary for the system could force a loss of specific anammox activity due to nitrite competition with denitrifiers. These results pointed out the importance of the previous partial-nitritation process control in order to obtain a correct influent nitrite to ammonium molar ratio for the anammox reactor. In addition, sudden variation of the leachate characteristics must be avoided.
由于城市垃圾渗滤液提供了可生物降解的有机物和微生物的衰减，异养反硝化与厌氧氨氧化过程共存，有助于去除氮。这两种生物量都消耗亚硝酸盐，增加了系统对亚硝酸盐的需求。本文的目的是研究导致系统降低脱氮效率的原因。在这项研究中，城市垃圾渗滤液在厌氧氨氧化序批式反应器（SBR）中处理了 360 天。厌氧氨氧化反应器的平均处理量为 0.24kgN m(-3) d(-1)，最大脱氮效率可达 89%。结果表明：i）合适的进水亚硝态氮与氨氮摩尔比是避免厌氧氨氧化反应器性能出现问题的关键因素；ii）亚硝态氮过量会导致反应器中亚硝态氮积累；iii）供给的亚硝态氮低于系统所需量会导致由于与反硝化菌的竞争而损失特定的厌氧氨氧化活性。这些结果表明，为了使厌氧氨氧化反应器获得正确的进水亚硝态氮与氨氮摩尔比，以前的部分硝化过程控制非常重要。此外，必须避免渗滤液特性的突然变化。
