School of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215000, China.
School of Environmental Science and Engineering, Jiangsu Key Laboratory of Environmental Science and Technology, Suzhou University of Science and Technology, Suzhou 215009, China.
Int J Environ Res Public Health. 2020 Jan 26;17(3):772. doi: 10.3390/ijerph17030772.
Microsensors were applied to study the diffusion reaction and activity of a nitrogen species of deposit sediment from a drinking water supply system. Microprofiles of dissolved oxygen (DO), NH-N, NO-N, and NON in the sediment indicated that the DO concentration decreased from the highest at the sediment surface to zero at the bottom of the sediment. Similarly, with the increase of depth, NH-N initially increased rapidly and then decreased slowly, while the concentration of NO-N reached a maximum at around 6000 μm and then decreased to about 0.1 mg·L near the bottom of the sediment. Almost no change was observed for NO-N. The decrease of NH-N and DO corresponded well with the increase of NO-N. Furthermore, based on a consumption and production rate analysis, DO has always been consumed; the NH-N consumption rate increased rapidly within 0-1000 μm, reaching about 14 mg·L·S·10. A small amount of NH-N was produced in 2000-6000 μm, which could be attributed to denitrification activity. There was no change deeper than 6000 μm, while NO-N was produced at a depth between 0 and 6000 μm and was consumed in the deeper zone. At the depth of 9000 μm, the NO-N consumption reached a maximum of 5 mg·L·S·10. The consumption of DO and NH-N, which corresponded with the production of NO-N in a specific microscale range within the sediment, demonstrated nitrification and denitrification activities. In addition, the time required for the diffusion of only DO, NH-N, NO-N, and NO-N was estimated as 14 days; however, in the practical, even after 60 days of operation, there was still a continuous reaction, which provided further evidence towards microbial activities within the sediment.
微传感器被应用于研究饮用水供应系统沉积物中氮物种的扩散反应和活性。沉积物中溶解氧（DO）、NH4+-N、NO3--N 和 NON 的微剖面表明，DO 浓度从沉积物表面的最高值下降到底部的零值。同样，随着深度的增加，NH4+-N 最初迅速增加，然后缓慢减少，而 NO3--N 的浓度在大约 6000 μm 处达到最大值，然后在沉积物底部附近下降到约 0.1 mg·L-1。NO2--N 几乎没有变化。NH4+-N 和 DO 的减少与 NO3--N 的增加很好地对应。此外，基于消耗和生产速率分析，DO 一直被消耗；NH4+-N 的消耗速率在 0-1000 μm 内迅速增加，达到约 14 mg·L-1·S-10。在 2000-6000 μm 处产生少量的 NH4+-N，这可以归因于反硝化活性。在 6000 μm 以下没有变化，而在 0-6000 μm 之间产生了 NO3--N，并在更深的区域被消耗。在 9000 μm 深处，NO3--N 的消耗达到最大值，为 5 mg·L-1·S-10。在沉积物的特定微尺度范围内，DO 和 NH4+-N 的消耗与 NO3--N 的产生相对应，表明存在硝化和反硝化活性。此外，仅 DO、NH4+-N、NO3--N 和 NON 扩散所需的时间估计为 14 天；然而，在实际情况下，即使在 60 天的运行后，仍有持续的反应，这为沉积物中微生物活性提供了进一步的证据。
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