ZnFe-LDHs覆膜改性人工湿地基质脱氮除磷性能研究

以空心砖、蛭石、沸石、煤渣4种人工湿地常用基质为研究对象,进行ZnFe-LDHs双金属覆膜改性。以静态吸附试验为主,对改性前后的基质进行污水脱氮除磷试验研究并探讨其吸附机理,结果表明:与原始基质相比,改性后的各基质对总磷的吸附量均有不同程度的提高,改性空心砖的吸附效果最佳,总磷的吸附量提升了17%。沸石改性后对氨氮的吸附量提升了18%,增加明显,其余改性基质对氨氮吸附量增加不明显。基质改性前后对氨氮和总磷的吸附均符合Freundlich规律。

Study on nitrogen and phosphorus removal on constructed wetland substrates by ZnFe-LDHs coating modification

This paper takes four common substrates on constructed wetland as research objects to conduct ZnFe-LDHs coating modification.The research was carried out primarily by conducting static adsorption experiment.The substrates before and after modification were tested on the sewage’s nitrogen and phosphorus removal experiment to investigate the adsorption mechanism.The four substrates include hollow brick,vermiculate,zeolite and coal cinder.The results showed:compared with the original substrates,each substrate after modification improves the removal rate of total phosphorus at varying degrees,and the best adsorption effect is modified hollow brick,the total phosphorus adsorption capacity of which increased by 17 ％;zeolite after modification obviously increased its absorption ability,which was a 18％ increase for ammonia nitrogen;the absorption to ammonia nitrogen and total phosphorus of each kind of substrate after modification conforms to the Freundlich rule.