Through the efficient enrichment of oxygen, the oxygen utilization rate is greatly improved, and the energy consumption is greatly reduced, which provides a simple and effective innovative strategy for the development of high-efficiency and low-consumption electric Fenton water treatment technology.
In the early morning of this day (March 7), Beijing time, the research results of Professor Wang Ying's team from the School of Environmental Science and Engineering of Tongji University were publishedProceedings of the National Academy of Sciences (PNAS), an international authoritative academic journal, **titled "Local O2 Concentrating Boosts the Electro-Fenton Process for Energy-Efficient Water Remediation".
Organic pollutants in water pose a serious threat to human health and the ecological environment. The electric Fenton technology produces strong oxidizing reactive oxygen species through the electroreduction of natural oxygen, thereby degrading various organic pollutants in the water, without the need for chemical additives and is expected to use renewable energy, showing great application prospects in the field of organic wastewater treatment. However, the low solubility and slow diffusion of oxygen in the water limits the treatment efficiency of the electric Fenton technology. While aeration can increase oxygen**, this method results in more than 75% of the electrical energy being consumed by aeration, and less than 1% of the oxygen being used efficiently. How to improve the oxygen utilization rate of the electric Fenton process has become a key issue to reduce energy consumption.
Schematic diagram of simple oxygen diffusion (SOD) and local oxygen enrichment (LOC).
Inspired by the process of gill respiration, the team proposed:"Local Oxygen Enrichment (LOC)".The cathode with oxygen enrichment effect was constructed, and the local oxygen enrichment mechanism was revealed by combining in-situ electrochemical characterization techniques and theoretical calculation methods. Unlike the "simple oxygen diffusion (SOD)" process near conventional electrodes, the electrodes continuously extract dissolved oxygen directly from the bulk solution to the electrochemical reaction interface, thereby reducing or even eliminating the need for aeration and improving oxygen utilization11 times more, the energy consumption of the electric Fenton process decreasedMore than 65%.The technical and economic analysis and continuous flow experiments show that the proposed method of "local oxygen enrichment" is a simple and effective innovative strategy, which provides a new idea for the development of high-efficiency and energy-saving electric Fenton water treatment technology.
*The first author is Xu Bincheng, a doctoral student in the School of Environmental Science and Engineering, Tongji University, Professor Wang Ying is the corresponding author, Tongji University is the first unit, and the co-corresponding author is Zhang Gong, associate researcher of the Water Quality and Aquatic Ecology Research Center, School of Environment, Tsinghua University. This project was supported by the National Natural Science Program**, the National Key R&D Program, and the Shanghai Municipal Science and Technology Commission project chaired by Professor Wang Ying.
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*: Faculty of Environmental Science and Engineering.
Editor: Chen Shaoying.
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