A method for degrading organic pollutants on riverbanks based on a light-driven biochar-activated iron mineral system

Abstract

This invention discloses a light-driven method that utilizes straw biochar combined with activated iron minerals to regulate free radical generation at the soil-water interface in paddy fields or riverbanks, thereby degrading indirect photodegradable organic pollutants. This method employs a co-construction remediation system of straw biochar, activated iron minerals, and indigenous microorganisms at the interface to synergistically degrade organic pollutants that are difficult to photodegrade under sunlight. Bioremediation is achieved by constructing characteristic iron-reducing bacteria and organic matter-degrading bacteria at the soil-water interface, while chemical oxidation is accomplished through photochemical free radical generation from iron-containing minerals, and electron transfer is regulated by iron cycling mediated by straw biochar. This method achieves enhanced bio-photochemical coupling degradation of indirect photodegradable organic pollutants without the need for external hydrogen peroxide or persulfate. This invention is convenient to operate, low in cost, has good treatment effect, high degradation efficiency, is environmentally friendly, and has wide applications. It is a green remediation technology with broad application prospects and high practical value in the field of environmental remediation.

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