Characteristic Differences of Pollutants Adsorbed by Ceramsite in Process of Dynamic Vertical Flow Enhancement
To evaluate the distinct adsorption characteristics and application potential of various ceramsites as substrates for wetland systems,this study focused on biological ceramsites and shale ceramsites.Utilizing static adsorption tests and dynamic vertical flow adsorption experiments,complemented by scanning electron microscopy(SEM),X-ray diffraction(XRD),and X-ray photoelectron spectroscopy(XPS),we conducted an in-depth analysis of their adsorption performance and mechanisms.The findings indicate that:1)Both types of ceramsites possess favorable surface structures and abundant phase compositions,with metal-rich surfaces that contribute to their superior adsorption capabilities.2)During the static adsorption tests,the theoretical saturation adsorption capacity for total phosphorus(TP)was notably high for both ceramsites,with the biological ceramsite reaching up to 1156.43 mg/kg.Kinetic analysis revealed a variety of adsorption pathways,and both ceramsites exhibited low desorption risks,suggesting they are unlikely to cause secondary pollution even with prolonged use.3)In the dynamic vertical flow tests,ceramsites demonstrated effective adsorption of nitrogen,phosphorus,and organic matter in the initial stages.However,as the tests progressed,a degree of adsorption fatigue became apparent,with shale ceramsite experiencing the most severe effects.Nevertheless,the removal rates remained around 50％,indicating good stability and effectiveness.Based on the experimental outcomes and mechanistic insights,it was determined that both ceramsites are valuable for wetland matrices and contribute to the improvement of dissolved organic matter(DOM)in water quality.
constructed wetlandceramisitedynamic vertical flowdifferences in adsorption characteristics
国家科技期刊平台
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