人工湿地中的SND机理以及DO、pH对其的影响

Mechanism on simultaneous nitrification and denitrification(SND)in constructed wetlands with emphasis on DO and pH effect

人工湿地中的水生植物向系统中输送大量的DO,并为系统中的微生物提供栖息地,使得系统中连续同时发生硝化和反硝化(SND)反应。DO的高低直接影响到人工湿地系统SND的效果,根据SND的发生机理,可采用复合植物床(系统前端栽种泌氧能力强、后端泌氧能力稍弱的水生植物)和间歇运行的的方式来改善整个系统的脱氮能力。pH过高或过低都会抑制人工湿地系统的SND作用,最适宜值为7.0,据此可以选择适当pH的湿地填料来提高系统的SND作用。

The functions of constructed wetland for the treatment of wastewaters were deeply studied. It is found that Simultaneous Nitrification and Denitrification（SND） in Constructed Wetlands is really present in the wetland. The effects of plants used in the wetland were explored and it is observed that the plants play important role in the SND. DO is a key factor affecting SND process and higher DO in the wetland system can improve SND at the optimum pH 7.