Polyurethane Foamsenhanced Denitrification in Denitrification Biofilter Coupled with Water Electrolysis
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电解产氢反硝化滤池系统(Denitrification biofilter coupled with water electrolysis,DNBF-WE)中的滤料对脱氮性能影响极大,因此,本研究分别采用陶粒(Ceramic granules,CG)和聚氨酯海绵(Polyurethane foams,PUFs)为滤料,研究了不同C/N、电流强度I和水力停留时间HRT下系统的脱氮特性,并分析了 2个系统中微生物群落的结构特征.结果表明,在最佳运行工况(C/N=2,I=60 mA,HRT=5 h)下,与传统陶粒滤料系统相比,聚氨酯海绵滤料系统的NO3--N去除率从65.10％提高到79.36％,反硝化速率从120.31 g N/(m3·d)提升至148.31 g N/(m3·d),同时,电子利用率从60.69％显著提高到94.62％.高通量测序表明,聚氨酯海绵滤料系统中优势属Thauera(36.79％)、Pelomonas(7.51％)、Acidovorax(1.81％)和Hydrogenophaga(3.89％)的相对丰度均高于陶粒滤料系统.研究结果表明,采用聚氨酯海绵作为滤料是一种有效强化DNBF-WE脱氮的方法.
The filter media in the denitrification biofilter coupled with water electrolysis(DNBF-WE)significantly affect ni-trogen removal performance.Therefore,this study used ceramic granules(CG)and polyurethane foams(PUFs)as filter media to investigate the nitrogen removal characteristics of the system under different C/N ratios,current intensities(Ⅰ),and hydraulic re-tention times(HRT).The microbial community structures in the two systems were also analyzed.The results showed that under optimal operating conditions(C/N=2,I=60 mA,HRT=5 h),the NO3--N removal rate of the PUFs filter media system in-creased from 65.10％to 79.36％,and the denitrification rate increased from 120.31 g N/(m3·d)to 148.31 g N/(m3·d),compared with the traditional CG filter media system.Additionally,the electron utilization rate significantly increased from 60.69％to 94.62％.High-throughput sequencing indicated that the relative abundances of the dominant genera Thauera(36.79％),Pelomonas(7.51％),Acidovorax(1.81％),and Hydrogenophaga(3.89％)in the PUFs filter media system were higher than those in the CG filter media system.The study results demonstrated that using PUFs as filter media was an effective method to enhance nitrogen removal in DNBF-WE.
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