氧调控下复合垂直流人工湿地脱氮研究
Removal Nitrogen of Integrated Vertical-Flow Constructed Wetland Under Aeration Condition
查看参考文献26篇
文摘
|
溶解氧是人工湿地脱氮的重要限制性因子,调控湿地内氧状态分布是提高其脱氮效果的关键所在.为此,研究了夏?冬季时氧调控下复合垂直流人工湿地(IVCW)中氧状态的变化规律?脱氮效果及净化机制.结果表明,氧调控下IVCW中氧状态改善明显,夏?冬季时好氧Ⅰ区范围(以深度表示)分别从22 cm?17 cm扩大至53 cm?44 cm;即使冬季植物枯萎时,氧调控下IVCW沿水流方向仍可依次形成好氧Ⅰ区-缺氧区-好氧Ⅱ区(O-A-O)3个功能区,而冬季时常规IVCW仅有好氧Ⅰ区-缺氧区(O-A)2个功能区.氧调控下IVCW的有机物降解和硝化能力显著增强,尤其是冬季时COD?TN?NH 4+-N的平均去除率分别提高了12.2%?6.9%?15.1%;并且采用8 h:16 h的间歇停曝方式,出水中NO 3--N浓度无明显增加.另外,好氧Ⅰ区是IVCW中污染物去除的主要区域,氧调控主要是增强了该功能区的净化能力.因此,氧调控措施对于IVCW系统的优化与应用具有重要意义 |
其他语种文摘
|
Oxygen is an important limit factor of nitrogen removal in constructed wetlands,so it is the key point for improving nitrogen removal efficiency of constructed wetlands that the optimization of oxygen distribution within wetlands. Therefore, oxygen status, nitrogen removal and purification mechanism of integrated vertical-flow constructed wetland(IVCW) under aeration condition in summer and winter have been studied. The results showed that both oxygen levels and aerobic zones were increased in the wetland substrates. The area of oxic zoneⅠ(expressing with depth) extended from 22 cm,17 cm to 53 cm,44 cm,in summer and winter, respectively. The electric potential(Eh) profiling demonstrated that artificial aeration maintained the pattern of sequential oxic-anoxic-oxic(O-A-O) redox zones within the aerated IVCW in winter, while only two oxic-anoxic(O-A) zones were present inside the non-aerated IVCW in the cold season. The decomposition of organic matter and nitrification were obviously enhanced by artificial aeration since the removal efficiency of COD,TN and NH 4+-N were increased by 12.2%,6.9% and 15.1% in winter, respectively. There was no significant accumulation of NO 3--N in the effluent with an aeration cycle of 8 h on and 16 h off in this experiment. Moreover,we found that oxic zoneⅠ was the main region of pollutants removal in IVCW system, and artificial aeration mainly acted to enhance the purification capacity of this oxic zone in the aerated IVCW. These results suggest that aeration is important for optimization and application of IVCW system |
来源
|
环境科学
,2011,32(3):717-722 【核心库】
|
关键词
|
复合垂直流人工湿地
;
氧调控
;
脱氮
;
氧化功能区
;
净化机制
|
地址
|
中国科学院水生生物研究所, 淡水生态和生物技术国家重点实验室, 武汉, 430072
|
语种
|
中文 |
文献类型
|
研究性论文 |
ISSN
|
0250-3301 |
学科
|
行业污染、废物处理与综合利用 |
基金
|
国家自然科学基金项目
;
湖北省自然科学基金杰出青年人才项目
;
国家水体污染控制与治理科技重大专项
;
贵州省教育厅自然科学基金
|
文献收藏号
|
CSCD:4148228
|
参考文献 共
26
共2页
|
1.
Kadlec R H.
Treatment wetlands,1996
|
被引
82
次
|
|
|
|
2.
Benham B L. Investigating dairy lagoon treatability in a laboratory-scale constructed wetlands system.
Transactions of the ASAE,1999,42:495-502
|
被引
2
次
|
|
|
|
3.
Vymazal J. Removal mechanisms and types of constructed wetlands.
Constructed wetlands for wastewater treatment in Europe,1998:17-66
|
被引
16
次
|
|
|
|
4.
Reddy K R. Biogeochemical indicators to evaluate pollutant removal efficiency in constructed wetlands.
Water Science and Technology,1997,35:1-10
|
被引
47
次
|
|
|
|
5.
Lee M A. The effect of low temperatures on ammonia removal in laboratory-scale constructed wetland.
Water Environment Research,1999,71:340-347
|
被引
3
次
|
|
|
|
6.
Van-Oostrom A J. Denitrification in constructed wastewater wetlands receiving high concentration of nitrate.
Water Science Technology,1994,29:7-14
|
被引
2
次
|
|
|
|
7.
Cottingham P D. Aeration to promote nitrification in constructed wetlands.
Environmental Technology,1999,20:69-75
|
被引
4
次
|
|
|
|
8.
Wu M Y. Oxygen fluxes and ammonia removal efficiencies in constructed treatment wetlands.
Water Environmental Research,2001,73(6):661-666
|
被引
8
次
|
|
|
|
9.
Brix H. Functions of macrophytes in constructed wetlands.
Water Science Technology,1994,29:71-78
|
被引
83
次
|
|
|
|
10.
Noorvee A. The effect of pre-aeration on the purification processes in the long-term performance of a horizontal subsurface flow constructed wetland.
Science of the Total Environment,2007,380:229-236
|
被引
13
次
|
|
|
|
11.
Austin D C.
Nitrification and denitrification in a tidal vertical flow wetland pilot. Proceedings of the water environment technical conference 2003,2003
|
被引
1
次
|
|
|
|
12.
Maltais-Landry G. Effects of artificial aeration, macrophyte species, and loading rate on removal efficiency in constructed wetland mesocosms treating fish farm wastewater.
Journal of Environmental Engineering and Science,2007,6(4):409-414
|
被引
9
次
|
|
|
|
13.
Green M. Enhancing nitrification in vertical flow constructed wetland utilizing a passive air pump.
Water Research,1998,32(12):3513-3520
|
被引
20
次
|
|
|
|
14.
Lahav O. Ammonium removal using a novel unsaturated flow biological filter with passive aeration.
Water Research,2001,35(2):397-404
|
被引
6
次
|
|
|
|
15.
孙亚兵. 自动增氧型潜流人工湿地处理农村生活污水的研究.
环境科学学报,2006,26(3):404-408
|
被引
50
次
|
|
|
|
16.
Ouellet-Plamondon C. Artificial aeration to increase pollutant removal efficiency of constructed wetlands in cold climate.
Ecological Engineering,2006,27(3):258-264
|
被引
50
次
|
|
|
|
17.
任拥政. 局部充氧提高波形潜流人工湿地除污效能的研究.
中国给水排水,2007,23(11):28-31
|
被引
9
次
|
|
|
|
18.
鄢璐. 强化供氧条件下潜流型人工湿地运行特性.
环境科学,2007,28(4):736-741
|
被引
20
次
|
|
|
|
19.
Jamieson T S. The use of aeration to enhance ammonia nitrogen removal in constructed wetlands.
Canadian Biosystems Engineering,2003,45:109-114
|
被引
4
次
|
|
|
|
20.
Zhao W Y. Removal of dibutyl phthalate by a staged, vertical-flow constructed wetland.
Wetlands,2004,24(1):202-206
|
被引
4
次
|
|
|
|
|