复合人工湿地对氮的深度处理效果及影响因素  

Advanced Treatment Effect and Influencing Factor of Nitrogen in Hybrid Constructed Wetland

作　　者：吴英海[1,2] 杨旭楠[2] 韩蕊[3] 王雄[1] 方建德[1] 方晓航[1] 吴艳阳 

机构地区：[1]环境保护部华南环境科学研究所,广东广州510655 [2]中山大学环境科学与工程学院,广东广州510275 [3]华南理工大学环境科学与工程学院,广东广州510640 [4]Department of Earth and Environmental Science,University of Pennsylvania

出　　处：《湿地科学》2014年第1期35-42,共8页Wetland Science

基　　金：中央级公益性科研院所基本科研业务费专项资金课题(ZX201211-097;ZX-200809-014和ZX-200712-23);国家科技重大专项项目(2008ZX07211-003)资助

摘　　要：研究了2008年5～10月对废水中氮的深度处理效果，采用Monod动力学模型对该人工湿地进行模拟并验证，分析进水中NH4^＋-N和NO3^-N的含量与其去除率的相关性以及COD／NIL4^＋—N、COD／NO3^—N对降解系数的影响。结果表明，①复合湿地组合形式对NH4＋-N和NO3--N的去除率分别介于66．0％~77．1％和46．2％～77．2％之间；（2）Monod模型对人工湿地中NH4＋—_N和NO3-—N去除率的预测值与实验观测值吻合程度较好；③NH4＋-N和NO3--N的去除率分别随着其在进水中的含量的增加而增大；④进水中的COD／NH4＋-N与凤Ht^＋N呈负相关关系，而COD／NO3-—N与／（NO3-N呈正相关关系。人工湿地中硝化和反硝化作用受到进水中NH4—N和NO3-—N含量的限制，氮的去除率随着进水中NH4＋—N和NO3-—N浓度的增加而增大。有机物和NH4＋—N在人工湿地中的降解可能存在竞争氧的关系，可利用碳源构成了反硝化作用的限制因素。Monod kinetic model was introduced to analyse the treatment effect of nitrogen, and was verified through three statistical parameters. Correlation of input nitrogen loading vs. removal rates, kinetic coeffi- cients from Monod kinetics against COD/NH4＋--N, COD/NO3 --N ratio in wetland system were discussed. It was consisted of vertical subsurface flow constructed wetland （VSF）, free water surface constructed wetland （FWS） and horizontal subsurface flow constructed wetland （HSF）. The areas of each style wetland were 1 260 m2（VSF）, 1 250 m2（FWS） and 2 490 m2（HSF） successively. The influent of wetland system was continuous, and hydraulic load was 0.17-0.31 m/d, and the hydraulic detention time was 1.48-2.69 d. Study results showed that, （1）the removal efficiencies of NH4＋--N and NO3--N reached 66.0%-77.1% and 46.2%-77.2% respective- ly in hybrid constructed wetland. The influent of constructed wetlands system that had been treated by tradi- tional secondary sewage treatment process contained low concentrations of organic pollutant, NH4＋--N and NO3---N, nevertheless, the style of hybrid constructed wetland in our study had a good advanced treatment ef- fect on nitrogen in wastewater; （2）regressions of Monod kinetics for correlating inlet and outlet nitrogen val- ues in wetland system indicated that the difference between actual and predicted value was very slight. The models showed better performances for predicting NH,＋--N and NO3---N removal in experimental VSF, FWS and HSF wetlands. However, it should be noted that the development of models from Monod kinetics entails significant simplifications. These models may not achieve satisfactory results in the engineered systems where nutrient uptake by plants contribute to more significant removal than biodegradation, particularly in different temperate climate conditions; （3）the removal efficiencies of NI-I4＋--N and NO --N increased in accord with their concentrations of the influent, indicating that nitrification and denitri

关 键 词：复合人工湿地 氮 深度处理 Monod模型 

分 类 号：X703.1[环境科学与工程—环境工程]