微纳米曝气对植物浮床处理支浜水脱氮效果的影响

摘要

为探索微纳米曝气技术对再力花植物浮床脱氮的影响,研究了不同曝气方式[微纳米曝气组、鼓风曝气组、无曝气浮床(对照组)]的处理效果.结果表明,与对照组相比,微纳米曝气组对TN和NH4+-N的去除率提高了13.35％和21.72％,而鼓风曝气组分别提高了5.64％和10.61％.但微纳米曝气形成的富氧环境不利于NO3--N的去除,去除率低于鼓风曝气组和对照组浮床.微纳米曝气对植物的生长有显著改善,试验结束时植物生物量增加了65.38％,而鼓风曝气组、对照组分别只增加了21.05％及63.93％.植物吸收的TN也存在显著差异,微纳米曝气组最高,为90.60 mg,鼓风曝气组为54.84 mg,对照组为63.42mg.微纳米曝气比鼓风曝气具有更好的充氧效果,可显著改变植物根系微环境,有利于植物裉系氯化细菌、硝化细菌的生长,但不利于反硝化细菌的生长%The effects of micro-nanometer aeration on the nitrogen removal of a Thalia dealbata floating-bed was investigated by comparing the nitrogen removal of a group with three treatments of micro-nanometer aeration,a group with air Mow aeration and a group without aeration (the control group). The results showed that compared with the group without aeration,the removal rates of TN and NH4 +-N were increased by 13. 35% and 21. 72% ,respectively,in the micro-nanometer aeration plant floating-bed,and increased by 5. 64% and 10.61% ,respectively,with the air blow aeration method. However,the high concentrations of DO formed by the micro-nanometer aeration had a negative effect on the removal of NO3- -N. The removal rates of NO3- -N in this group were lower than those of the air blow aeration group and the control group. By comparing the results from the micro-nanometer aeration group with those from the control group,micro-nanometer aeration was found to significantly improve the growth of plants. By the end of the experiment,the biomass in this group had increased by 65. 38% ,while the biomass increase in the air blow aeration group and the control were 21.05% and 63 93% ,respectively. The total nitrogen uptake by the plants was also different among the treatments. The highest uptake of TN was obtained in the micro-nanometer aeration group (90.60 mg) ,compared to 54.84 and 63.42 mg in the air blow aeration and the control group,respectively. In conclusion,micro-nanometer aeration was the most effective way of increasing DO,changing the microenvironment of the rhizosphere,and enhancing the growth of ammonifying and nitrifying bacteria,but it retarded the growth of the denitrifying bacteria.