碳纤维作为生物膜载体具有一定脱氮能力,但存在自然挂膜周期较长、挂膜初期水质净化能力较差等问题。为提高碳纤维的挂膜与脱氮效果,采用除氮菌剂人工强化碳纤维挂膜,探究除氮菌剂对碳纤维固载微生物膜的强化作用,并查明挂膜成熟后碳纤维的脱氮性能。结果表明,除氮菌剂可显著强化碳纤维的挂膜效果,强化挂膜组碳纤维上的微生物量和微生物碳源代谢活性较自然挂膜组显著提高,其中,强化挂膜组碳纤维上的微生物量峰值是自然挂膜组的10.3倍,微生物碳源代谢活性是自然挂膜组的3.5倍。强化挂膜碳纤维的脱氮效果显著提高,与自然挂膜碳纤维组相比,强化挂膜碳纤维组的总氮和氨氮削减率分别提高了8.0和14.1个百分点。研究成果可为应用人工强化挂膜碳纤维治理富营养化水体提供科学依据与技术支撑。
Abstract
Carbon fiber as a biofilm carrier has denitrification ability yet with long biofilm formation period and inferior initial water purification capacity. To improve the film-forming and denitrification performance of carbon fiber, nitrogen-removing bacteria was adopted to strengthen the film-forming effect of carbon fiber. The strengthening effect of nitrogen removal agent on carbon fiber supported microbial membrane was explored, and the denitrification performance of carbon fiber undergone film-forming was also examined. Results unveiled that the film-forming performance of carbon fiber could be significantly enhanced by nitrogen-removing bacteria. The microbial biomass and carbon source metabolic activity of microorganisms of carbon fibers in the enhanced membrane group were significantly higher than those in the natural membrane group, with the peak value of microbial biomass of the enhanced membrane group 10.3 times that in the natural membrane group, and carbon source metabolic activity of microorganisms 3.5 times that in the natural membrane group. Moreover, the nitrogen removal efficiency of strengthened carbon fiber was significantly improved, with the reduction rates of total nitrogen and ammonia nitrogen of strengthened membrane carbon fiber group increasing by 8.0% and 14.1%, respectively, compared with the natural membrane carbon fiber group. The research findings offer scientific basis and technical support for applying artificially strengthened carbon fiber to eutrophication treatment.
关键词
碳纤维 /
除氮菌剂 /
挂膜 /
脱氮 /
微生物量
Key words
carbon fiber /
nitrogen-removing bacteria /
film-forming /
denitrification /
microbial biomass
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基金
国家自然科学基金区域创新发展联合基金重点项目(U21A20156);中国长江三峡集团有限公司科研项目(0704106)
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