模块化移动床人工湿地(Modular Moving Bed Constructed Wetland,MMB-CW)因其去除效率高和抗堵塞等优势逐渐成为研究热点.本研究构建了轻质陶粒填充的MMB-CW,研究了不同填充度条件下MMB-CW的脱氮效果与N2O的排放特征.结果表明:陶粒填充的MMB-CW具有良好的NH4+-N和NO3--N去除效果,脱氮效果随陶粒填充度升高而增强(P＜0.05).在MMB-CW系统启动运行过程中,高陶粒填充度有利于促进硝化-反硝化耦合脱氮.当MMB-CW系统稳定时,100％填充度NH4+-N和NO3--N的去除率分别为21.8％和43.7％,N2O排放通量为0.6 mg/(m2·d),与现有研究人工湿地N2O排放通量相比处于较低水平.该研究为扩大MMB-CW技术的实际应用提供了一定的理论依据.
A Study on Nitrogen Removal Effect and N2O Emission of Modular Moving Bed Constructed Wetland
Modular moving bed-constructed wetlands have emerged as a research hotspot due to its advantages such as high removal efficiency and anti-clogging.In this study,a lightweight ceramsite-filled MMB-CW was constructed,and the nitrogen removal effect and N2O emission characteristics of the MMB-CW were investigated under different filling conditions.The results indicated that MMB-CW filled with ceramsite exhibited excellent removal efficiencies for NH4+-N and NO3-N,with denitrification efficiency increasing as ceramsite filling extent increased(P＜0.05).Throughout the start-up operation of the MMB-CW system,the high ceramsite filling extent was conducive to the promotion of nitrification-denitrification coupled nitrogen removal.Under stable conditions of the MMB-CW system,the removal rates of NH4+-N and NO3--N were 21.8％and 43.7％,respectively,at 100％filling,with an N2O emission flux of 0.6 mg/(m2·d),presenting lower levels compared to existing research on N2O emission flux in constructed wetlands.This study provides a theoretical basis for expanding the practical application of MMB-CW technology.
Modular Moving Bed Constructed WetlandNitrous oxide emissionAnti-cloggingNitrogen removal effect
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