常温下接种回流污泥实现BAF一体化自养脱氮工艺

发布时间：2018-11-21 17:54

【摘要】：为实现高氨氮废水的高效低耗稳定去除,在常温条件下,对曝气生物滤池(BAF)中实现与稳定短程硝化-厌氧氨氧化自养脱氮工艺进行了研究。研究结果表明:常温条件下,BAF接种二沉池回流污泥,采用闷曝-连续运行结合的接种挂膜方式,可成功实现短程硝化-厌氧氨氧化一体化自养脱氮。闷曝阶段使种泥活性恢复,而连续流运行过程中游离氨(FA)浓度高,可抑制亚硝酸盐氧化菌(NOB),实现BAF中亚硝酸盐累积;通过调整BAF回流方式,降低回流液中NO_2~-N-,防止NOB生长,并通过厌氧氨氧化(Anammox)滤池出水回流方式,接种微量Anammox菌,运行80 d可实现短程硝化-厌氧氨氧化,140 d后系统运行稳定,总氮(TN)去除率达76.62%。生物滤池有利于短程硝化-厌氧氨氧化工艺的实现与稳定,生物膜中不同厚度存在好氧缺氧环境,利于氨氧化菌(AOB)和Anammox菌共存;滤料的过滤作用有效地防止了Anammox菌流失,使其在系统中不断累积生长。不仅如此,AOB和Anammox菌均为自养菌且生长缓慢,避免了生物滤池的频繁反冲洗,简化了生物滤池的运行。气水比是BAF中一体化运行的关键参数,本研究中最佳的气水比为12:1,氨氮去除负荷达到0.91 kg N·m~(-3)·d~(-1),氨氮和TN去除率分别可达96.86%和85.47%。
[Abstract]:In order to realize the stable removal of high ammonia nitrogen wastewater with high efficiency and low consumption, the process of realizing and stabilizing autotrophic denitrification in (BAF) of biological aerated filter was studied in this paper. The results showed that under normal temperature, BAF inoculated secondary settling tank reflux sludge, and adopted the method of aeration and continuous operation of inoculation and hanging membrane, which could successfully realize the integrated autotrophic denitrification of short course nitrification-anaerobic ammonia oxidation. In the stage of aeration, the activity of seed mud was restored, and the concentration of free ammonia (FA) was high during the continuous flow operation, which could inhibit the nitrite accumulation of (NOB),. By adjusting the reflux mode of BAF, reducing the NO_2~-N-, in the reflux liquid to prevent the NOB growth, and inoculating the microamount of Anammox bacteria in the effluent of the (Anammox) filter by anaerobic ammonia oxidation, the short-cut nitrification-anaerobic ammonia oxidation could be realized in 80 days. After 140 days, the system was stable and the removal rate of total nitrogen (TN) reached 76.62%. Biofilter is conducive to the realization and stability of short-cut nitrification-anaerobic ammonia oxidation process. Aerobic anoxic environment exists in different thickness of biofilm, which is conducive to the coexistence of (AOB) and Anammox bacteria in the biofilm. The filtration effect of filter media can effectively prevent the loss of Anammox bacteria and make it accumulate and grow in the system. Moreover, both AOB and Anammox bacteria are autotrophic bacteria and grow slowly, which avoids frequent backwashing of biofilter and simplifies the operation of biofilter. The gas-water ratio is the key parameter in the integrated operation of BAF. The optimum air-water ratio in this study is 12: 1, and the removal load of ammonia and nitrogen reaches 0.91 kg N m-3 d-1. The removal rates of ammonia nitrogen and TN were 96.86% and 85.47% respectively.
【作者单位】：北京工业大学城镇污水深度处理与资源化利用技术国家工程实验室;中国人民大学环境学院;
【基金】：国家自然科学基金项目(51508561)~~
【分类号】：X703.1

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