Oxygenation and synchronous control of nitrogen and phosphorus release at the sediment-water interface using oxygen nano-bubble modified material

Jingfu Wang; Jingan Chen; Pingping Yu; Xiaohong Yang; Lijuan Zhang; Zhanli Geng; Kangkang He

doi:10.1016/j.scitotenv.2020.138258

Oxygenation and synchronous control of nitrogen and phosphorus release at the sediment-water interface using oxygen nano-bubble modified material

Sci Total Environ. 2020 Jul 10:725:138258. doi: 10.1016/j.scitotenv.2020.138258. Epub 2020 Mar 27.

Authors

Jingfu Wang¹, Jingan Chen², Pingping Yu³, Xiaohong Yang³, Lijuan Zhang⁴, Zhanli Geng⁵, Kangkang He³

Affiliations

¹ State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, PR China. Electronic address: wangjingfu@vip.skleg.cn.
² State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, PR China. Electronic address: chenjingan@vip.skleg.cn.
³ State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, PR China; College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, PR China.
⁴ Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, PR China; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, PR China.
⁵ Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, PR China.

PMID: 32298884
DOI: 10.1016/j.scitotenv.2020.138258

Abstract

Synchronously controlling the nitrogen (N) and phosphorus (P) release from sediments is an important basis for eutrophication management in lakes, but it is still a technical challenge at present. Loading nano-bubbles on the surface of natural minerals to increase dissolved oxygen(DO) level at the sediment-water interface (SWI)provides a possible solution to this problem. In this study, oxygen nano-bubble modified mineral (ONBMM) technology was developed, and its efficiency of oxygenation at the SWI and effect on the removal of internal nutrient input were evaluated under simulated conditions. The results showed that ONBMM effectively improved DO levels near the SWI; the highest concentration reached 6.55 mgL^-1. Meanwhile, adding ONBMM remarkably reduced the concentrations of total P(TP), total N(TN) and ammonia N(NH₃-N) in the overlying water. Compared with the control group, the fluxes of TP, NH₃-N, and TN loading from sediments in simulation cores treated with ONBMM reduced by 96.4%, 51.1%, and 24.9%, respectively. The high-resolution data obtained by DGT showed that ONBMM effectively inhibited the reduction and release of FeP through increasing the oxygen level at the SWI. The results of 16S rRNA high-throughput sequencing showed that adding ONBMM strengthened the role of nitrobacteria, denitrifying bacteria, and ammonia oxidation bacteria at the SWI. The ONBMM technology provides a new tool to achieve oxygenation at the SWI and in situ control of internal pollution in eutrophic lakes.

Keywords: Eutrophication; Nitrogen; Oxygen nano-bubble; Phosphorus; Sediment-water interface.