出水水位对垂直潜流湿地脱氮效果及N_2O释放的影响  

Influence of Water Level on Nitrogen Removal and N_2O Emission from Vertical Subsurface Flow Constructed Wetland

作　　者：黄耀棠 刘凯 

机构地区：[1]广东华实环境工程设计有限公司,广东佛山528200 [2]西安环境监测站,陕西西安710054

出　　处：《中国给水排水》2016年第1期5-10,共6页China Water & Wastewater

摘　　要：开展了不同出水水位下垂直潜流湿地脱氮效果和N2O释放的对比研究，并分析了出水水位对湿地中脱氮微生物分布的影响。结果表明，出水水位可影响垂直潜流湿地的脱氮效果及湿地中N2O的释放通量，当系统水力负荷（HLR）设定为0．20m^3／（m^2·d）且出水水位为50cm时，垂直潜流湿地对TN的平均去除率可达78．24％，湿地中N2O的释放通量则随出水水位的降低而增大，即当出水水位由100cm降至10cm时，湿地系统的N2O释放通量由3．75—14．07μg/（m^2·h）增至26．96～35．52μg/（m^2·h）。出水水位亦可影响垂直潜流湿地中脱氮微生物的分布，合适的出水水位可实现脱氮微生物的合理分配，强化系统的硝化与反硝化作用，提高系统的脱氮能力并有效降低N2O的释放通量。因此，选择合适的出水水位可实现垂直潜流湿地对生活污水的高效低耗处理。A comparison study on nitrogen removal and N2O emission from vertical subsurface flow constructed wetland （VSSFCW） at three different water levels was carried out, and the influence of water level on the distribution of microbes for nitrogen removal in VSSFCW was investigated. The results showed that water level had significant influence on nitrogen removal and N2O emission from VSSFCW. When the hydraulic loading rate （HLR） was 0.20 m^3/（m^2·d）, and the water level was 50 em, the av- erage removal rate of TN was 78.24%. The N2O emission flux increased as water level decreased, name- ly the N2O emission flux increased from 3.75 - 14.07 μg/（m^2·h） to 26.96 - 35.52 μg/（m^2·h） as water level decreased from 100 cm to 10 cm. The distribution of microbes for nitrogen removal could also be influenced by water level in the system. An appropriate water level could help to achieve reasonable distribution of microbes for nitrogen removal, enhance nitrification and denitrifieation in the system, im- prove the nitrogen removal capacity of the system and reduce the N2O emission flux. Therefore, choosing the appropriate water level could realize the high-efficiency and low-consumption treatment of domestic sewage by VSSFCW.

关 键 词：生活污水 垂直潜流湿地 出水水位 脱氮 N2O 

分 类 号：X703[环境科学与工程—环境工程]