Treatment of Domestic Wastewater from Small Cities on Vertical Flow Constructed Wetlands (VFCWs)

2017 ◽  
pp. 1066-1073
Author(s):  
R. Gourdon ◽  
M. Kania ◽  
M. Gautier ◽  
B. Kim ◽  
P. Michel
Keyword(s):  
Constructed Wetlands ◽  
Domestic Wastewater ◽  
Vertical Flow ◽  
Small Cities ◽  
Vertical Flow Constructed Wetlands

Two strategies for advanced nitrogen elimination in vertical flow constructed wetlands

1997 ◽  
Vol 35 (5) ◽  
pp. 71-77 ◽  
Author(s):  
Johannes Laber ◽  
Reinhard Perfler ◽  
Raimund Haberl
Keyword(s):  
Constructed Wetlands ◽  
Settling Tank ◽  
Domestic Wastewater ◽  
Experimental Period ◽  
Vertical Flow ◽  
One Stage ◽  
Upper Austria ◽  
System A ◽  
Vertical Flow Constructed Wetlands ◽  
Stage System

Since 1991 the institute for water provision has run two vertical flow constructed wetlands for domestic wastewater treatment at two farm houses (8 p.e.) in Upper Austria. The systems are designed for elimination of organic compounds and for nitrification which was no problem even under winter conditions. In 1995 two methods were tested to achieve denitrification also in both systems. System A is a one-stage system, system B has two stages operated in series. The approach to the one-stage system consisted in pumping a part of the nitrified effluent from the soil filter back to the settling tank of the influent, where the raw wastewater mixes with the nitrified effluent-water. The approach to the two-stage system B consisted in adding an external carbon source (methanol) into the second, water saturated stage. The research was undertaken during several experimental stages to test the influence of the recirculation ratio (system A) respectively of the feeding (system B; intermittent, continuous, batch). The highest elimination rates could be achieved with system B (dosage of methanol) during experimental stage 1 (intermittent loading four times a day). The mean elimination rates were 82% for Ninorg and 78% for TN. The TN elimination performance of system A was only a little lower (72%). The elimination of COD, BOD5 and TOC was no problem throughout the whole experimental period (effluent concentrations of both systems were well below the Austrian standards).

Comparison of vertical-flow constructed wetlands with and without supplementary aeration treating decentralized domestic wastewater

2013 ◽  
Vol 34 (1) ◽  
pp. 53-60 ◽  
Author(s):  
Liandong Zhu ◽  
Josu Takala ◽  
Erkki Hiltunen ◽  
Zhaohua Li ◽  
Yohanes Kristianto
Keyword(s):  
Constructed Wetlands ◽  
Domestic Wastewater ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetlands

scholarly journals The Effects of Plants on Pollutant Removal, Clogging, and Bacterial Community Structure in Palm Mulch-Based Vertical Flow Constructed Wetlands

2019 ◽  
Vol 11 (3) ◽  
pp. 632 ◽  
Author(s):  
Marina Carrasco-Acosta ◽  
Pilar Garcia-Jimenez ◽  
José Alberto Herrera-Melián ◽  
Néstor Peñate-Castellano ◽  
Argimiro Rivero-Rosales
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
Constructed Wetlands ◽  
Bacterial Community Structure ◽  
Rflp Analysis ◽  
Domestic Wastewater ◽  
Experimental Period ◽  
Pollutant Removal ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetlands

In this study, the effects of plants on the performance and bacterial community structure of palm mulch-based vertical flow constructed wetlands was studied. The wetlands were built in August 2013; one of them was planted with Canna indica and Xanthosoma sp., and the other one was not planted and used as a control. The experimental period started in September 2014 and finished in June 2015. The influent was domestic wastewater, and the average hydraulic surface loading was 208 L/m2d, and those of COD, BOD, and TSS were 77, 57, and 19 g/m2d, respectively. Although the bed without plants initially performed better, the first symptoms of clogging appeared in December 2014, and then, its performance started to fail. Afterwards, the wetland with plants provided better removals. The terminal restriction fragment length polymorphism (T-RFLP) analysis of Enterococci and Escherichia coli in the effluents suggests that a reduction in their biodiversity was caused by the presence of the plants. Thus, it can be concluded that the plants helped achieve better removals, delay clogging, and reduce Enterococci and E. coli biodiversity in the effluents.

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