生态环境学报2025，Vol.34Issue(5)：763-772,10.DOI:10.16258/j.cnki.1674-5906.2025.05.010
载氧沸石与水丝蚓对沉积物-水剖面氮迁移转化的影响
The Influence of Oxygen-carrying Zeolite and Tubificid Worm on Nitrogen Migration and Transformation in the Sediment-water Core
摘要
Abstract
In this study,a microcosm experimental system was established to assess the effect of tubificid worms on the removal of nitrogen from anaerobic sediment water through oxygen-carrying zeolite capping as well as the potential mechanism underlying this process.The results indicated that the application of oxygen-carrying zeolite significantly increased the dissolved oxygen(DO)concentration in the overlying water after 20 days and was 2.78 times higher than that of the control group.However,the presence of tubificid worms was responsible for a 56.73%reduction in DO concentration compared to the control but promoted the diffusion of oxygen bubbles released from the oxygen-carrying zeolite to the deeper layers of the sediment.Therefore,the DO concentration was significantly higher than that of the group with oxygen-carrying zeolite capping(3.77‒0.47 mg∙L-1).Meanwhile,the presence of tubificid worms increased the abundance of denitrifying bacteria,such as Comamonadaceae in the sediment and Novosphingobium and Proteiniclasticum in the capping layer.After 20 days incubation,the concentration of total nitrogen in the overlying water reached 9.89 mg∙L-1(oxygen-carrying zeolite group),10.40 mg∙L-1(oxygen-carrying zeolite+Tubificid worm group),11.60 mg∙L-1(zeolite group),12.49 mg∙L-1(zeolite+Tubificid worm group),18.59 mg∙L-1(control group),and 20.99 mg∙L-1(Tubificid worm group),respectively.However,irrespective of the presence of Tubificid worms,nitrous oxide emission upon application of oxygen-carrying zeolite at the end of the incubation period was not influenced and was significantly lower than that of other treatments(p<0.05).The results indicated that the downward movement of tubificid worms in the sediment facilitated the influence of oxygen-carrying zeolite in the deeper sediment,thereby increasing the DO concentration in the sediment,altering the microbial community structure,and benefiting nitrogen removal in deeper sediment layers.关键词
内源污染/载氧材料/沸石/水丝蚓/氮Key words
endogenous pollution/oxygen-carrying material/zeolite/tubificid worm/nitrogen引用本文复制引用
潘璇,罗竣潇,唐炳然,郭翔宇,何强,李宏..载氧沸石与水丝蚓对沉积物-水剖面氮迁移转化的影响[J].生态环境学报,2025,34(5):763-772,10.基金项目
国家自然科学基金项目(52370199) （52370199）
重庆市技术创新与应用发展专项重点项目(CSTB2023TIAD-KPX0092) （CSTB2023TIAD-KPX0092）
重庆城投曙光湖建设有限公司联合技术攻关专题(SJPPP-2024-025) （SJPPP-2024-025）
