Responses of Dissimilatory Nitrate Reduction to Ammonium and Denitrification to Plant Presence, Plant Species and Species Richness in Simulated Vertical Flow Constructed Wetlands

Wetlands ◽  
2016 ◽  
Vol 37 (1) ◽  
pp. 109-122 ◽  
Author(s):  
Chong-Bang Zhang ◽  
Wen-Li Liu ◽  
Wen-Juan Han ◽  
Ming Guan ◽  
Jiang Wang ◽  
...  
Keyword(s):  
Species Richness ◽  
Plant Species ◽  
Constructed Wetlands ◽  
Nitrate Reduction ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetlands ◽  
Dissimilatory Nitrate Reduction

Removal of chlorpyrifos in recirculating vertical flow constructed wetlands with five wetland plant species

Chemosphere ◽  
2019 ◽  
Vol 216 ◽  
pp. 195-202 ◽  
Author(s):  
Xiao-Yan Tang ◽  
Yang Yang ◽  
Murray B. McBride ◽  
Ran Tao ◽  
Yu-Nv Dai ◽  
...  
Keyword(s):  
Plant Species ◽  
Constructed Wetlands ◽  
Vertical Flow ◽  
Wetland Plant ◽  
Vertical Flow Constructed Wetlands

scholarly journals Effect of Plant Species on the Performance and Bacteria Density Profile in Vertical Flow Constructed Wetlands for Domestic Wastewater Treatment in a Tropical Climate

Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3485
Author(s):  
Franck Michaël Zahui ◽  
Jean-Marie Pétémanagnan Ouattara ◽  
Mahamadou Kamagaté ◽  
Lacina Coulibaly ◽  
Alexandros I. Stefanakis
Keyword(s):  
Wastewater Treatment ◽  
Plant Species ◽  
Constructed Wetlands ◽  
Anaerobic Bacteria ◽  
Tropical Climate ◽  
Pennisetum Purpureum ◽  
Aerobic Bacteria ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetlands ◽  
Andropogon Gayanus

Bacteria are frequently studied due to their involvement in pollutants transformation processes during wastewater treatment. In this study, the treatment efficiency, bacteria densities and their vertical profile were investigated in pilot-scale vertical flow constructed wetlands (VFCW) planted with different plant species under a tropical climate in west Africa. Five beds were planted with local plant species, i.e., Andropogon gayanus, Chrysopogon zizanioides, Echinochloa pyramidalis, Pennisetum purpureum and Tripsacum laxum, while one bed remained unplanted. These species have been rarely used in CWs while some (e.g., T. laxum) are tested for the first time. After a 7-month trial, bacteria densities were measured in substrate samples separated into six layers along the bed depth. Plants presence enhanced the bacterial density and VFCW efficiency; the removal rates of organic matter (90.9–95.9%; COD and 95.2–98.5%; BOD5), nitrogen (74.3–84%; TN and 76–84%; NH4-N) and phosphorus (77.4–96.9%; PO4-P) were higher by 5.9–24.1% compared to the control bed, providing an overall excellent treatment performance for a single-stage VFCW system. Small numbers of anaerobic bacteria were obtained in the VFCWs, explaining the low-to-zero NO3-N removal, except for the VFCWs with T. laxum and P. purpureum. Aerobic bacteria decreased from the upper to bottom layers from 17.4 to 0.1 × 106 CFU/g in the planted beds, while anaerobic bacteria increased from 0.1 to 2.1 × 106 CFU/g. Anaerobic bacteria were more abundant in the unplanted than in the planted beds. The total bacteria count was dominated by aerobic bacteria, and decreased from the surface towards the bottom. Overall, the VFCW with P. purpureum demonstrated the highest efficiency, indicating that this design is an effective and sustainable nature-based solution for wastewater treatment in a tropical climate.

Wavy Subsurface Flow and Vertical Flow Constructed Wetlands: Effects of Aeration and Wastewater Composition on Wetland Clogging

2015 ◽  
Vol 141 (9) ◽  
pp. 04015018 ◽  
Author(s):  
Yongzheng Ren ◽  
Qilong Gong ◽  
Tian C. Zhang ◽  
Jianxiong Kang ◽  
Dongqi Liu
Keyword(s):  
Constructed Wetlands ◽  
Subsurface Flow ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetlands
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