College of Civil and Architectural Engineering, North China University of Science and Technology, Tangshan, People's Republic of China.
Environ Sci Pollut Res Int. 2018 Jan;25(1):771-781. doi: 10.1007/s11356-017-0477-1. Epub 2017 Oct 23.
Horizontal zeolite subsurface constructed wetland system (HZCWs) and horizontal limestone subsurface constructed wetland system (HLCWs) were applied to the removal of nitrogen in lightly polluted wastewater, and the existing forms, changes, and removal mechanism of nitrogen in the constructed wetlands were analyzed. The results indicated that compared with HLCWs, HZCWs exhibited better nitrogen removal effect, and the maximum removal rates of ammonia nitrogen and total nitrogen could reach 96.97 ± 5.29 and 93.12 ± 3.35%, respectively. Besides, analysis of the removal effect on nitrogen in different existing forms on different substrate heights in the constructed wetlands showed that variation of nitrogen removal efficiency had certain regularities, which were related to the interior construction features of the wetland systems, and agreed with the regularities in the changes of the influential factors such as DO inside of the wetlands. In addition, degradation mechanism of pollutions was also analyzed, and the results indicated that the quantity of microorganisms and enzymes, including FDA, catalase, and urease, on the surface of the substrates had significant influence on the removal regularities and effects of the major pollutions in constructed wetlands.
水平沸石潜流湿地系统（HZCWs）和水平灰岩潜流湿地系统（HLCWs）被应用于去除轻度污染废水中的氮，分析了湿地中氮的存在形式、变化和去除机制。结果表明，与 HLCWs 相比，HZCWs 表现出更好的氮去除效果，氨氮和总氮的最大去除率分别可达 96.97±5.29%和 93.12±3.35%。此外，对湿地不同基质高度上不同存在形式氮的去除效果进行分析表明，氮去除效率的变化具有一定的规律性，这与湿地系统的内部构造特征有关，与湿地内部 DO 等影响因素的变化规律一致。此外，还分析了污染物的降解机制，结果表明，基质表面包括 FDA、过氧化氢酶和脲酶在内的微生物和酶的数量对湿地中主要污染物的去除规律和效果有显著影响。
