葡萄籽纳米铁介导微氧污泥床生物脱氮性能研究

Study on biological denitrification performance of microaerobic sludge bed mediated by grape seed nanoscale iron

针对微氧活性污泥技术面临的启动周期长、氮去除效率低等问题,通过投加采用葡萄籽提取物为原材料制备的纳米铁(Grape Seed-nano iron,GS-nFe)构建了GS-nFe介导的微氧活性污泥新体系,从而实现了运行效能的提高。研究结果表明,GS-nFe的单个粒径范围在50~300 nm;反应器在投加GS-nFe后,平均出水NH_(4)^(+)-N、TIN和COD去除率分别维持在89.48%、76.24%和79.39%,GS-nFe的投加使得厌氧氨氧化菌属的相对丰度由1.98%增至2.87%。此外,norank_f_norank_o_C10-SB1A的相对丰度占比由1.59%增至3.02%,其可与好氧反硝化菌、铁自养反硝化菌、厌氧氨氧化等菌属共同协作,提高生物脱氮效能。

To address the issues associated with microaerobic activated sludge technology,such as long start-up period and low nitrogen removal efficiency,a novel microaerobic activated sludge system mediated by grape seed-nano iron(GS-nFe)is established through adding nano iron with grape seed extracts as raw materials,thereby achieving an enhanced operational efficiency.The findings reveal that single particle size of GS-nFe ranges from 50 nm to 300 nm.After adding GS-nFe into the reactor,the average removal efficiencies of NH_(4)^(+)-N,TIN,and COD in the effluent maintain at 89.48%,76.24%,and 79.39%,respectively.The addition of GS-nFe makes the relative abundance of anammox bacteria rise from 1.98%to 2.87%.Furthermore,the relative abundance proportion of norank_f_norank_o_C10-SB1A increases from 1.59%to 3.02%.This bacterium,in conjunction with aerobic denitrifying bacteria,iron-oxidizing denitrifying bacteria,and anammox bacteria,collaboratively contributes to the enhancement of biological nitrogen removal efficiency.