Fungal Denitrification Activity in Vertical Flow Constructed Wetlands as Impacted by Plant Species Richness, Carbon, Nitrogen and pH Amendments

2017 ◽  
Vol 99 (6) ◽  
pp. 748-752
Author(s):  
W. L. Liu ◽  
C. B. Zhang ◽  
W. J. Han ◽  
M. Guan ◽  
S. Y. Liu ◽  
...  
Keyword(s):  
Species Richness ◽  
Plant Species ◽  
Constructed Wetlands ◽  
Plant Species Richness ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetlands ◽  
Denitrification Activity

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.

Plant species richness enhances nitrous oxide emissions in microcosms of constructed wetlands

2014 ◽  
Vol 64 ◽  
pp. 108-115 ◽  
Author(s):  
Jie Chang ◽  
Xing Fan ◽  
Hongying Sun ◽  
Chongbang Zhang ◽  
Changchun Song ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Species Richness ◽  
Plant Species ◽  
Constructed Wetlands ◽  
Plant Species Richness ◽  
Nitrous Oxide Emissions
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