CHENRen-jie,LIUMing-hui,DINGChen-long,et al.Startup of Biological Aerated Filter Seeded with Attached Microbes from Sand Filter in a Waterworks and Its Nitrification Performance[J].China Water & Wastewater,2022,38(8):25-30.
基于水厂砂滤填料附着物的BAF启动及其硝化性能
- Title:
- Startup of Biological Aerated Filter Seeded with Attached Microbes from Sand Filter in a Waterworks and Its Nitrification Performance
- 摘要:
- 对自来水厂砂滤池上层填料附着微生物的三组培养物进行了16S rRNA基因扩增子测序，分析其群落组成和结构差异，随后将三组培养物混合后成功启动了4个曝气生物滤池并分析各装置的硝化性能。结果表明：三组培养物仅检测出硝化螺旋菌属、亚硝化螺旋菌属和亚硝化单胞菌属三种硝化菌属；在NH4+-N浓度为0.5 mg/L时，硝化螺旋菌属是唯一的高丰度硝化微生物，由于缺少氨氧化细菌的存在，推测该硝化螺旋菌属可能存在完全氨氧化菌。4个曝气生物滤池装置成功启动后，在水力停留时间为2 d的条件下，滤池对NH4+-N均有较高的去除率（>98%）。以石英砂为填料的装置在连续进水的初期NO3--N浓度显著降低，由于进水未添加有机物且溶解氧充足，推测装置在此期间发生了好氧条件下的自养反硝化。以活性炭为填料的装置在连续进水后，不仅NH4+-N去除率高，而且还对NO3--N有较高的去除率（>99%），推测活性炭吸附-生物降解-再吸附是该滤池脱氮的主要作用机制。
- Abstract:
- Three groups of microbial cultures attached to the upper filler of a sand filter in a waterworks were sequenced by 16S rRNA gene amplicon sequencing to analyze their microbial community and structural differences. Then, the three groups of cultures were mixed for startup of four biological aerated filters, and the nitrification performance of each bio-filter was analyzed. Only three genera were detected in the three groups of cultures: Nitrospira, Nitrosospira, and Nitrosomonas. When the initial NH4+-N was 0.5 mg/L, Nitrospira was the only nitrifying bacterium with high relative abundance. Due to the lack of ammonia oxidizing bacteria, it was speculated that there may be complete ammonia oxidizing bacteria in the Nitrospira. After the successful startup of the four biological aerated filters, the NH4+-N removal efficiencies of the filters were all higher than 98% when the hydraulic retention time was 2 days. The NO3--N decreased significantly at the initial stage of continuous feeding in the sand filter. Since no organic matter was added into the influent and dissolved oxygen was sufficient, it was speculated that autotrophic denitrification took place under aerobic conditions during this period. In addition, the activated carbon filter not only had a high NH4+-N removal efficiency, but also had a NO3--N removal efficiency of more than 99% after continuous feeding. It is speculated that activated carbon adsorption-biodegradation-readsorption is the main mechanism of nitrogen removal in this filter.
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