Abstract
To demonstrate the variation and affecting factors of dissolved oxygen under different aeration strategies in polluted urban river sediment, simulation systems constructed with collected sediment and in situ overlaying water were aerated up or beneath the sediment-water interface 6 h day−1 for 15 days. The results showed that aeration greatly altered the spatial pattern of DO in overlying water regardless of the way of treatment. Within the first 5 min of aeration, DO in overlying water increases rapidly from 0.86–3.13 mg L−1 to the saturated range of 6.12–8.14 mg L−1. During the first 5 days, aeration to water costed 5 min to reach the highest DO, while aeration to sediment costed 30 min to reach a lower highest level of DO in overlaying water. Analysis showed that DO was significantly negatively correlated with NO2 −-N and COD Mn , suggesting that DO was synergistically consumed by biochemical processes of organic matter degradation and nitrification. Aeration to sediment (ES group) and aeration to water (EW group) differently influenced nitrification and organic matter degradation. After daily aeration treatment, nitrification was the main oxygen-depleting process in EW group, especially after the action of the second stage of nitrification, where organic matter was probably largely degraded during aeration. However, in ES group, DO was consumed by both organic matter oxidation and nitrification processes.
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Abbreviations
- COD:
-
Chemical oxygen demand
- DO a :
-
The time-weighted average of dissolved oxygen
- DO max :
-
The peak of dissolved oxygen
- DO r :
-
The maximal decline rate of dissolved oxygen
- DTN:
-
Dissolved total nitrogen
- EC:
-
Non-aeration
- ES:
-
Aeration to sediment
- EW:
-
Aeration to water
- LOI:
-
Loss on ignition
- SOD:
-
Sediment oxygen demand
- WOD:
-
Water body oxygen demand
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Acknowledgments
This study was financially supported by the Natural Science Foundation of Jiangsu Province of China (SBK201321353, BK20140922), the Special Fund for Environment Scientific Research in the Public Interest (201509038), the National Natural Science Foundation of China (41403064), 2015-NIES-Specific Founds for Basic Scientific Research by Central Nonprofit Research Institutes, the Natural Science Foundation of Nantong City (BK2013058), and the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (14KJB610007).
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All authors claim that they do not have any actual or potential conflict of interest including any financial, personal, or other relationships with other people or organizations.
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Bo Liu and Wen-lin Wang contributed equally to this work.
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Liu, B., Wang, Wl., Han, Rm. et al. Dynamics of Dissolved Oxygen and the Affecting Factors in Sediment of Polluted Urban Rivers under Aeration Treatment. Water Air Soil Pollut 227, 172 (2016). https://doi.org/10.1007/s11270-016-2869-0
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DOI: https://doi.org/10.1007/s11270-016-2869-0