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.
Startup of Biological Aerated Filter Seeded with Attached Microbes from Sand Filter in a Waterworks and Its Nitrification Performance
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第8期
Page:
25-30
Column:
Date of publication:
2022-04-17
- 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.
Last Update:
2022-04-17