Combating hypoxia/anoxia at sediment-water interfaces: A preliminary study of oxygen nanobubble modified clay materials

The Science of the Total Environment
Honggang ZhangGang Pan

Abstract

Combating hypoxia/anoxia is an increasingly common need for restoring natural waters suffering from eutrophication. Oxygen nanobubble modified natural particles were investigated for mitigating hypoxia/anoxia at the sediment-water interface (SWI) in a simulated column experiment. By adding oxygen nanobubble modified zeolites (ONMZ) and local soils (ONMS), the oxygen nanobubble concentrations (105-107 particles/mL) were several orders of magnitude higher in the water than the original water solution (104 particles/mL) within 24 h. In the column experiment, an oxygen-locking surface sediment layer was formed after capping with ONMZ and ONMS particles. The synergy of diffusion of oxygen nanobubbles and retention of oxygen in this layer contributes to both the increase of DO and reversal of hypoxic conditions. The overlying water had significantly higher dissolved oxygen (DO) values (4-7.5 mg/L) over the experimental period of 127 days in ONMZ and ONMS compared with the control systems (around 1 mg/L). Moreover, the oxidation-reduction potential (ORP) was reversed from -200 mV to 180-210 mV and maintained positive values for 89 days in ONMZ systems. In the control systems, ORP was consistently negative and decreased from -200 mV to...Continue Reading

Citations

Jun 18, 2019·Chemical Society Reviews·Bhabananda BiswasRavi Naidu
Apr 18, 2020·Physical Review Letters·Beng Hau TanClaus-Dieter Ohl
Nov 11, 2019·Ecotoxicology and Environmental Safety·Xiaonan JiGang Pan
Apr 9, 2019·Accounts of Chemical Research·Ariel J AtkinsonPaul Westerhoff
Jun 11, 2019·Environmental Science & Technology·Tao LyuGang Pan
Sep 15, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Zhan GaoBing Wang

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