Effects of plant roots on the hydraulic performance during the clogging process in mesocosm vertical flow constructed wetlands

被引:40
作者
Hua, G. F. [1 ,2 ]
Zhao, Z. W. [2 ,3 ]
Kong, J. [4 ]
Guo, R. [1 ]
Zeng, Y. T. [1 ]
Zhao, L. F. [3 ]
Zhu, Q. D. [5 ]
机构
[1] Hohai Univ, Coll Water Conservancy & Hydroelect Power, Nanjing 210098, Jiangsu, Peoples R China
[2] Hohai Univ, State Key Lab Hydrol Water Resource & Hydraul Eng, Nanjing 210098, Jiangsu, Peoples R China
[3] Hohai Univ, Coll Environm, Nanjing 210098, Jiangsu, Peoples R China
[4] Hohai Univ, Coll Harbour Coastal & Offshore Engn, Nanjing 210098, Jiangsu, Peoples R China
[5] Nanjing Hydraul Res Inst, State Key Lab Hydrol & Water Resources & Hydraul, Nanjing 210029, Jiangsu, Peoples R China
关键词
Clogging; Plant root; Salt tracers; Hydraulic performance; Vertical flow-constructed wetlands; ORGANIC-MATTER ACCUMULATION; SOLIDS ACCUMULATION; CONDUCTIVITY; PATTERN; GRAVEL; MODEL; AERATION; DYNAMICS; REMOVAL; DESIGN;
D O I
10.1007/s11356-014-3249-1
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The aim of this study was to evaluate the effects of plant roots (Typha angustifolia roots) on the hydraulic performance during the clogging process from the perspective of time and space distributions in mesocosm vertical flow-constructed wetlands with coarse sand matrix. For this purpose, a pair of lab-scale experiments was conducted to compare planted and unplanted systems by measuring the effective porosity and hydraulic conductivity of the substrate within different operation periods. Furthermore, the flow pattern of the clogging process in the planted and unplanted wetland systems were evaluated by their hydraulic performance (e.g., mean residence time, short circuiting, volumetric efficiency, number of continuously stirred tank reactors, and hydraulic efficiency factor) in salt tracer experiments. The results showed that the flow conditions would change in different clogging stages, which indicated that plants played different roles related to time and space. In the early clogging stages, plant roots restricted the flow of water, while in the middle and later clogging stages, especially the later stage, growing roots opened new pore spaces in the substrate. The roots played an important role in affecting the hydraulic performance in the upper layer (0-30 cm) where the sand matrix had a larger root volume fraction. Finally, the causes of the controversy over plant roots' effects on clogging were discussed. The results helped further understand the effects of plant roots on hydraulic performance during the clogging process.
引用
收藏
页码:13017 / 13026
页数:10
相关论文
共 43 条
[1]   Effects of Root-Induced Compaction on Rhizosphere Hydraulic Properties - X-ray Microtomography Imaging and Numerical Simulations [J].
Aravena, Jazmin E. ;
Berli, Markus ;
Ghezzehei, Teamrat A. ;
Tyler, Scott W. .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2011, 45 (02) :425-431
[2]   Do macrophytes play a role in constructed treatment wetlands? [J].
Brix, H .
WATER SCIENCE AND TECHNOLOGY, 1997, 35 (05) :11-17
[3]   Performance of experimental horizontal subsurface flow constructed wetlands fed with dissolved or particulate organic matter [J].
Caselles-Osorio, Aracelly ;
Garcia, Joan .
WATER RESEARCH, 2006, 40 (19) :3603-3611
[4]   Effect of loading rate on performance of constructed wetlands treating an anaerobic supernatant [J].
Chazarenc, F. ;
Maltais-Landry, G. ;
Troesch, S. ;
Comeau, Y. ;
Brisson, J. .
WATER SCIENCE AND TECHNOLOGY, 2007, 56 (03) :23-29
[5]   Effect of plant and artificial aeration on solids accumulation and biological activities in constructed wetlands [J].
Chazarenc, F. ;
Gagnon, V. ;
Comeau, Y. ;
Brisson, J. .
ECOLOGICAL ENGINEERING, 2009, 35 (06) :1005-1010
[6]  
Chiarawatchai N, 2008, EFFICIENT MANAGEMENT, P164
[7]   Factors affecting the longevity of sub-surface horizontal flow systems operating as tertiary treatment for sewage effluent [J].
Cooper, D ;
Griffin, P ;
Cooper, P .
WATER SCIENCE AND TECHNOLOGY, 2005, 51 (09) :127-135
[8]   Evaluation of clogging in planted and unplanted horizontal subsurface flow constructed wetlands: solids accumulation and hydraulic conductivity reduction [J].
De Paoli, Andre Cordeiro ;
von Sperling, Marcos .
WATER SCIENCE AND TECHNOLOGY, 2013, 67 (06) :1345-1352
[9]  
FISHER PJ, 1990, ADV WAT POL, P21
[10]   Medium clogging and the dynamics of organic matter accumulation in constructed wetlands [J].
Fu, Guiping ;
Zhang, Jiahong ;
Chen, Wei ;
Chen, Zhuangrui .
ECOLOGICAL ENGINEERING, 2013, 60 :393-398