盐度对厌氧氨氧化反应器运行性能的影响

考察了厌氧氨氧化反应器处理高盐度、高浓度含氮废水的可行性.结果表明,高盐度显著抑制厌氧氨氧化活性,这种抑制具有可逆性.在30g·L-1(以NaCl计)盐度条件下,未驯化泻泥的厌氧氨氧化活性比对照(无盐水质条件)低67.5%;驯化污泥的厌氧氨氧化活性只比对照低45.1%.由高盐环境转移到低盐环境(无盐水)时,驯化污泥的厌氧氨氧化活性可提高43.1%.通过逐渐提高盐浓度,并调整反应器容积负荷避免基质抑制,可使厌氧氨氧化反应器适应30g·L-1(以NaCl计)盐度,其处理效能与对照期接近.但由于高盐度条件对厌氧氨氧化细菌生长的负面影响,反应器长期运行于高盐度条件下,容易出现功能衰退.

Effect of salinity on the performance of an anammox reactor

The feasibility of using an anammox (anaerobic ammonium oxidation) bioreactor to treat ammonium-rich brines was investigated. The results showed that the anammox activity was significantly inhibited by high salinity level and the inhibition was reversible. A salt shock loading of 30 g·L-1 (as NaCl) caused a 67.5% decrease in specific anammox activity compared to reference biomass (not exposed to salt). But the acclimatized biomass showed a specific anammox activity that was only 45.1% lower than that of the reference biomass. When transferred from brine to freshwater, the salt-exposed biomass resumed its activity by 43.1%. After appropriate acclimatization, the reactor performed well and the substrate removal capacity under a salinity of 30 g·L-1 (as NaCl) was comparable with that under freshwater conditions. However, the bioreactor was prone to malfunction after long-term salinity stress on the growth of anammox bacteria.