期刊
ENVIRONMENTAL POLLUTION
卷 272, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2020.115925
关键词
Sediment remediation; Nitrogen transformation; Tubifex tubifex; Aquatic ecosystem
资金
- Major Science and Technology Program for Water Pollution Control and Treatment, China [2017ZX07602-002]
Adding Tubifex tubifex for sediment remediation can accelerate the loss of organic matter and nitrogen in sediment, without significantly increasing the nitrogen concentration in water.
Sediment remediation in eutrophic aquatic ecosystems is imperative, but effective ecological measures are scarce. A pilot-scale trial investigated sediment remediation by the addition of Tubifex tubifex. The results showed that the addition of T. tubifex accelerated sediment organic matter (OM) and nitrogen (N) loss, with averages of 7.7% and 75.1% increased loss (IL) compared to treatments without T. tubifex in the 60-day experiment, respectively. The percentages of the increased in water to the IL in sediment were only 0.6%, 0.21%, 2.1% and 6.3% for NH4+-N, NOx--N, TN and COD, respectively, at the end of the experiment. The absolute abundances of the nitrifying genes AOA and AOB; the denitrifying genes napA, nirS, nirK, cnorB and nosZ; and the anaerobic ammonia oxidation gene anammox increased 2.3- to 11.0-fold with the addition of T. tubifex. Therefore, the addition of T. tubifex is an effective strategy for sediment remediation by accelerating OM and N loss in sediment without substantially increasing the water N concentration. (C) 2020 Elsevier Ltd. All rights reserved.
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