流加菌种对厌氧氨氧化工艺的影响

Effect of sequential biocatalyst addition on Anammox process

摘要:

厌氧氨氧化工艺具有很高的容积氮去除速率，现已成功应用于污泥压滤液等含氨废水的脱氮处理，容积氮去除速率高达9.5 kg/(m³·d)。但由于厌氧氨氧化菌为自养型细菌，生长缓慢，对环境条件敏感，致使厌氧氨氧化工艺启动时间过长，运行容易失稳，并且不适合处理有机含氨废水和毒性含氨废水，极大地限制了该工艺的进一步推广应用。为了克服厌氧氨氧化工艺实际应用中存在的问题，结合发酵工业中常用的菌种流加技术，提出了一种新型的菌种流加式厌氧氨氧化工艺，研究了该新型工艺在厌氧氨氧化工艺的启动过程、稳定运行以及处理有机含氨废水和毒性含氨废水等方面的应用情况。结果表明，通过向反应器内补加优质厌氧氨氧化菌种，可提高厌氧氨氧化菌数量及其在菌群中的比例，强化厌氧氨氧化功能。据此研发的菌种流加式厌氧氨氧化工艺不仅可以实现快速启动，而且可以稳定运行，并突破了有机物和毒物所致的运行障碍，拓展了厌氧氨氧化工艺的应用范围。

Abstract:

Anaerobic ammonium oxidation (Anammox) process is a high-rate nitrogen removal technology that has been applied in sludge dewatering effluents treatment with nitrogen removal rate as high as 9.5 kg/(m³·d). However, due to the slow growth rate of the autotrophic Anammox bacteria and the susceptivity to environmental conditions, the start-up of Anammox process is very long; the operation is unstable; and the nitrogen removal from organic-containing and/or toxicant-containing ammonium-rich wastewaters using Anammox process becomes difficult. Thus, the application of this high-rate process is significantly limited. In this paper, a newly-developed Anammox process with sequential biocatalyst (Anammox biomass) addition was established based on the procedure in fermentation engineering. We introduced the Anammox process with sequential biocatalyst addition on start-up, stable operation and the treatment of organic-containing and toxicant-containing ammonium-rich wastewaters. Results show that supplementing high-activity Anammox biomass into reactors will increase the amount of as well as the ratio of Anammox bacteria. Thus, the innovative Anammox process with sequential biocatalyst addition not only accelerates the start-up course, but also enhances the stability of Anammox process. Furthermore, it overcomes the drawbacks of wastewaters containing high organic content and toxic substances. Therefore, the application of Anammox process may be further enlarged.