潜流人工湿地理化性质及不同形态氮素的空间分布  

Physicochemical character and nitrogen changes in subsurface flow constructed wetland

作　　者：张涛[1] 宋新山[1] 

机构地区：[1]东华大学环境科学与工程学院,上海201620

出　　处：《生态环境学报》2010年第6期1343-1347,共5页Ecology and Environmental Sciences

基　　金：上海市自然科学基金项目(10ZR1400300);国家水专项(2008ZX07207-006-04);国家自然科学基金创新群体基金项目(50721006);国家重点基础研究发展计划973计划专题(2006CB403402-3)

摘　　要：对潜流人工湿地系统的可溶解氧、pH、氧化还原电位以及水温等理化因子和不同形态氮素的空间分布进行了较全面研究。结果表明,潜流人工湿地上部溶解氧高于下部;湿地下部pH较小,主要在6.9～7.2之间;氧化还原电位表现为上部前端氧化,下部后端还原;湿地装置内下部温度总体比上部要高,前端表现得尤其明显;湿地前端上部是COD和氨氮降解的主要场所,在前端下部区域硝氮的浓度低而亚硝氮、氨氮的浓度相对较高;湿地系统中亚硝氮含量较低,仅在前端中下部有所积累;总氮浓度在湿地前端较高而后端较低,其去除率在根本上依赖于反硝化作用的强度。The spatial distribution characteristics of physicochemical properties （dissolved oxygen, pH, oxidation reduction potential（ORP）, temperature, COD） and four kinds of nitrogenous compounds （TN, NH4＋-N, NO3--N, NO2--N） in subsurface flow constructed wetland system were studied. The results showed that the amount of dissolved oxygen was low in the lower part of wetland but high in the upper part. The pH in the lower part of wetland was small with the value of 6.9～7.2. The ORP indicated that the upper front section of wetland was oxidizing while the lower back section was reductive. The temprature was higher in the lower part of wetland and was highest in the lower front section. The main degradation site of COD and NH4＋-N was in the front upper part of wetland, while the main transformation site of NO3--N was in the front lower part. The concentration of NO2--N was low, and accumulated in the front lower section. The total nitrogen concentration was high in the front part of wetland but low in the back part and the removal efficiency was dependent on the intensity of denitrification.

关 键 词：潜流人工湿地 氮 理化 空间分布 

分 类 号：X14[环境科学与工程—环境科学]