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Fifteen-year study of environmental dredging effect on variation of nitrogen and phosphorus exchange across the sediment-water interface of an urban lake.
Environ Pollut. 2016 Dec; 219:639-648.EP

Abstract

Environmental dredging has been applied widely in Chinese lakes to reduce their internal nutrient loads. However, the efficacy of dredging to reduce internal loading of nitrogen (N) and phosphorus (P) and to improve water quality has been questioned by some researchers. In this study, the long-term (∼15 years) effects of dredging to reduce internal N and P loading in a closed, polluted urban lake were investigated. The results showed that the release of soluble reactive phosphorus (SRP) could be suppressed quickly after dredging, and that the dredging effect was sustained for about 18 months. A significant release of NH4+-N was discovered during the first 2-8 months after dredging, followed by maintenance of low-level release rates for about 21-32 months. The continuous inflowing of external pollution loading led to the increase in the release rates of SRP and NH4+-N. The external pollution loading was therefore reduced three years after dredging to strengthen the remediation effect. After that, high diffusive flux from the sediment was observed for both NH4+-N and SRP during summer seasons for about six years, followed by a decreasing trend. The NH4+-N concentration in the overlying water was reduced after the reduction of external loading, while a high concentration of SRP in the overlying water was still observed during summer seasons. In conclusion, the mid-term (<3 years) reduction of internal N and P loading could be achieved by dredging if the external pollution loading were not reduced. Achieving long-term control would require modification of external loading.

Authors+Show Affiliations

State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, PR China.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, PR China.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, PR China.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, PR China. Electronic address: cxfan@niglas.ac.cn.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27357484

Citation

Liu, Cheng, et al. "Fifteen-year Study of Environmental Dredging Effect On Variation of Nitrogen and Phosphorus Exchange Across the Sediment-water Interface of an Urban Lake." Environmental Pollution (Barking, Essex : 1987), vol. 219, 2016, pp. 639-648.
Liu C, Zhong J, Wang J, et al. Fifteen-year study of environmental dredging effect on variation of nitrogen and phosphorus exchange across the sediment-water interface of an urban lake. Environ Pollut. 2016;219:639-648.
Liu, C., Zhong, J., Wang, J., Zhang, L., & Fan, C. (2016). Fifteen-year study of environmental dredging effect on variation of nitrogen and phosphorus exchange across the sediment-water interface of an urban lake. Environmental Pollution (Barking, Essex : 1987), 219, 639-648. https://doi.org/10.1016/j.envpol.2016.06.040
Liu C, et al. Fifteen-year Study of Environmental Dredging Effect On Variation of Nitrogen and Phosphorus Exchange Across the Sediment-water Interface of an Urban Lake. Environ Pollut. 2016;219:639-648. PubMed PMID: 27357484.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fifteen-year study of environmental dredging effect on variation of nitrogen and phosphorus exchange across the sediment-water interface of an urban lake. AU - Liu,Cheng, AU - Zhong,Jicheng, AU - Wang,Jianjun, AU - Zhang,Lu, AU - Fan,Chengxin, Y1 - 2016/06/26/ PY - 2016/02/21/received PY - 2016/06/20/revised PY - 2016/06/20/accepted PY - 2016/7/1/pubmed PY - 2017/4/14/medline PY - 2016/7/1/entrez KW - Exchange across sediment-water interface KW - External pollution loading KW - Long-term investigation KW - Nitrogen and phosphorus KW - Sediment dredging SP - 639 EP - 648 JF - Environmental pollution (Barking, Essex : 1987) JO - Environ Pollut VL - 219 N2 - Environmental dredging has been applied widely in Chinese lakes to reduce their internal nutrient loads. However, the efficacy of dredging to reduce internal loading of nitrogen (N) and phosphorus (P) and to improve water quality has been questioned by some researchers. In this study, the long-term (∼15 years) effects of dredging to reduce internal N and P loading in a closed, polluted urban lake were investigated. The results showed that the release of soluble reactive phosphorus (SRP) could be suppressed quickly after dredging, and that the dredging effect was sustained for about 18 months. A significant release of NH4+-N was discovered during the first 2-8 months after dredging, followed by maintenance of low-level release rates for about 21-32 months. The continuous inflowing of external pollution loading led to the increase in the release rates of SRP and NH4+-N. The external pollution loading was therefore reduced three years after dredging to strengthen the remediation effect. After that, high diffusive flux from the sediment was observed for both NH4+-N and SRP during summer seasons for about six years, followed by a decreasing trend. The NH4+-N concentration in the overlying water was reduced after the reduction of external loading, while a high concentration of SRP in the overlying water was still observed during summer seasons. In conclusion, the mid-term (<3 years) reduction of internal N and P loading could be achieved by dredging if the external pollution loading were not reduced. Achieving long-term control would require modification of external loading. SN - 1873-6424 UR - https://www.unboundmedicine.com/medline/citation/27357484/Fifteen_year_study_of_environmental_dredging_effect_on_variation_of_nitrogen_and_phosphorus_exchange_across_the_sediment_water_interface_of_an_urban_lake_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0269-7491(16)30531-0 DB - PRIME DP - Unbound Medicine ER -