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人工湿地氮转化与氧关系研究
引用本文:何连生,刘鸿亮,席北斗,朱迎波,魏自民,霍守亮.人工湿地氮转化与氧关系研究[J].环境科学,2006,27(6):1083-1087.
作者姓名:何连生  刘鸿亮  席北斗  朱迎波  魏自民  霍守亮
作者单位:1. 中国环境科学研究院,北京,100012
2. 中国科学院地理科学与资源研究所,北京,100101
基金项目:国家重点基础研究发展规划(973)项目(2002CB412303,2002CB412303)
摘    要:应用N转化迁移模型分析廊道式人工湿地氮转化与氧供应的关系,验证目前湿地全程硝化反硝化脱氮机制的有效性.对各个廊道进出水NH4+-N、NO3--N、TN、B5、DO进行了测定和分析.在水力负荷5cm/d条件下,各廊道湿地有机氮矿化率为0.01~0.28g·(m2·d)-1、氨氮硝化率0.50~1.54 g·(m2·d)-1,反硝化率0.41~1.13 g·(m2·d)-1(占总氮损失的3.4%~35.4%)、植物净吸收氮0.07~0.26 g·(m2·d)-1(占总氮损失的7%~33%).硝化反硝化与有机质降解同时进行,在进水端最明显,这与传统认识相悖.按照全程硝化化学计量学得到的硝化需氧量(NOD)高于实际的表面复氧和植物根系放氧.最后对在高浓度有机质存在条件下,能减少对氧需求的2种新型脱氮机制进行了讨论.

关 键 词:人工湿地  硝化  反硝化  硝化需氧量
文章编号:0250-3301(2006)06-1083-05
收稿时间:5/6/2005 12:00:00 AM
修稿时间:2005-05-062005-06-21

Relationship Between the Nitrogen Removal and Oxygen Demand in Constructed Wetlands
HE Lian-sheng,LIU Hong-liang,XI Bei-dou,ZHU Ying-bo;WEI Zi-min;HUO Shou-liang,WEI Zi-min and HUO Shou-liang.Relationship Between the Nitrogen Removal and Oxygen Demand in Constructed Wetlands[J].Chinese Journal of Environmental Science,2006,27(6):1083-1087.
Authors:HE Lian-sheng  LIU Hong-liang  XI Bei-dou  ZHU Ying-bo;WEI Zi-min;HUO Shou-liang  WEI Zi-min and HUO Shou-liang
Institution:Chinese Research Academy of Environmental Science, Beijing. hls02@mails.tsinghua.edu.cn
Abstract:A simplified model of sequential N transformations and sink was applied to investigate the relationship between the nitrogen removal and oxygen demand to verify the validity of full nitrification-denitrification mechanism in a newly-built multi-stages constructed wetlands. Average net rates of N mineralization ranged from 0.01 to 0.28 g x (m2 x d)(-1), nitrification from 0.50 to 1.54 g x (m2 x d)(-1), denitrification from 0.41 to 1.13 g x (m2 x d)(-1)(3.4% approximately 35.4% of measured N removal in different stage) and plant assimilation from 0.07 to 0.26 g x (m2 x d)(-1) in the five tanks. Nitrification and denitrification occurred concurrently with BOD removal, even in the first stage receiving the higher-strength wastewater. Surprisingly, net areal nitrification rates, was correlated with BOD removal rates positively. Nitrification rates were also correlated linearly with average NH4+-N concentrations in the cascade tanks. The nitrogenous oxygen demand (NOD) required to support full nitrification of ammonia and mineralized Org-N in the wetland was in the upper range of that expected to be able to be supplied through surface and plant-mediated oxygen transfer. Some potential alternative nitrogen removal pathways with reduced overall oxygen requirements that have relevance to constructed wetlands were discussed.
Keywords:constructed wetlands  nitrification  denitrification  nitrogen oxygen demand
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