scholarly journals Performance of a Pilot Subsurface Flow Treatment Wetland System, Used for Arsenic Removal from Reverse Osmosis Concentrate, in the Municipality of Julimes, Chihuahua, Mexico

2020 ◽  
Vol 24 ◽  
Author(s):  
Mario Alberto Olmos-Márquez ◽  
Jesús Manuel Ochoa-Rivero ◽  
María Teresa Alarcón-Herrera ◽  
Eduardo Santellano-Estrada ◽  
José Humberto Vega-Mares ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Constructed Wetlands ◽  
Arsenic Removal ◽  
Arsenic Concentration ◽  
Subsurface Flow ◽  
Treatment Wetlands ◽  
Agricultural Irrigation ◽  
Treatment Wetland ◽  
Wetland System ◽  
Flow Treatment

The objective of this study was to implement a pilot system of treatment wetlands, using phytoremediation as an alternative technology to remove arsenic from the concentrate of a reverse osmosis system. The pilot system was composed of two subsurface flow constructed wetlands, planted with Eleocharis macrostachya and Shoenoplectus americanus. The wetlands were fed concentrate from a reverse osmosis system for seven months, with an average flow of 962 Ld-1 and an average arsenic concentration of 0.241 mgL-1. Removal rates between 43 % and 86 % were obtained for wetland 1 and between 35 % and 79 % for wetland 2 throughout the experiment. The two plant species developed normally despite the high levels of electrical conductivity in the range of 3584 to 5455 µscm-1 in wetland intake waters. The pilot wetland system removed significant levels of arsenic from the reverse osmosis concentrate, resulting in arsenic levels in the output waters that meet Mexican standard for using water in agricultural irrigation.

scholarly journals Phytoremediation performance of Acorus calamus and Canna indica for the treatment of primary treated domestic sewage through vertical subsurface flow constructed wetlands: a field-scale study

2020 ◽  
Vol 15 (2) ◽  
pp. 528-539 ◽  
Author(s):  
Mahesh Prasad Barya ◽  
Deepak Gupta ◽  
Tarun Kumar Thakur ◽  
Reetika Shukla ◽  
Gurudatta Singh ◽  
...  
Keyword(s):  
Constructed Wetlands ◽  
Total Nitrogen ◽  
Subsurface Flow ◽  
Domestic Sewage ◽  
Acorus Calamus ◽  
Canna Indica ◽  
Environmentally Sustainable ◽  
Treated Sewage ◽  
Subsurface Flow Constructed Wetlands ◽  
Flow Treatment

Abstract Under the present investigation, vertical subsurface flow constructed wetlands (VSSFCWs) planted with macrophytes treated domestic sewage in an environmentally sustainable manner. Treatment of domestic sewage with wetlands is an alternative method that decreases energy consumption and economic costs involved in the treatment of environmental contaminants. This study evaluates the potential efficiency of VSSFCWs using two different macrophytes, Acorus calamus and Canna indica for the treatment of domestic sewage. To perform this study, two chambers of VSSFCWs of dimensions 2.48 m × 1.24 m × 1.54 m were built. The wetland was fed with the primary treated sewage at a hydraulic loading rate (HLR) of 0.67 m3/h (hours) in a batch flow. Treatment of primary sewage was observed from day 1 to day 6; once a day (i.e. 24 h to 144 h). The treatment of sewage was found to be significant up to day 6 (144 h); beyond this time, no significant removal was observed. The results revealed that both the wetland setups performed significant removal of TDS, BOD5, total nitrogen, and phosphate. The wetland planted with Canna indica was a better performer for the removal of TDS (22.31%), BOD5 (81.79%), total nitrogen (60.37%), and phosphate (80%).

Effect of dosing regime on nitrification in a subsurface vertical flow treatment wetland system

2012 ◽  
Vol 66 (6) ◽  
pp. 1220-1224
Author(s):  
Suwasa Kantawanichkul ◽  
Walaya Boontakhum
Keyword(s):  
Continuous Flow ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Synthetic Wastewater ◽  
Experimental Unit ◽  
Vertical Flow ◽  
Treatment Wetland ◽  
Wetland System ◽  
Flow Treatment

In this study, the effect of dosing regime on nitrification in a subsurface vertical flow treatment wetland system was investigated. The experimental unit was composed of four circular concrete tanks (1 m diameter and 80 cm deep), filled with gravel (1–2 cm) and planted with Cyperus alternifolius L. Synthetic wastewater with average chemical oxygen demand (COD) and ammonia nitrogen of 1,151 and 339 mg/L was fed into each tank. Different feeding and resting periods were applied: continuous flow (tank 1), 4 hrs on and 4 hrs off (tank 2), 1 hr on and 3 hrs off (tank 3) and 15 minutes on and 3 hrs 45 minutes off (tank 4). All four tanks were under the same hydraulic loading rate of 5 cm/day. After 165 days the reduction of total Kjeldahl nitrogen and ammonia nitrogen and the increase of nitrate nitrogen were greatest in tank 4, which had the shortest feeding period, while the continuous flow produced the lowest results. Effluent tanks 2 and 3 experienced similar levels of nitrification, both higher than that of tank 1. Thus supporting the idea that rapid dosing periods provide better aerobic conditions resulting in enhanced nitrification within the bed. Tank 4 had the highest removal rates for COD, and the continuous flow had the lowest. Tank 2 also exhibited a higher COD removal rate than tank 3, demonstrating that short dosing periods provide better within-bed oxidation and therefore offer higher removal efficiency.

Dissolved Phosphorus Retention of Light-Weight Expanded Shale and Masonry Sand Used in Subsurface Flow Treatment Wetlands

2004 ◽  
Vol 38 (3) ◽  
pp. 892-898 ◽  
Author(s):  
Margaret G. Forbes ◽  
Kenneth R. Dickson ◽  
Teresa D. Golden ◽  
Paul Hudak ◽  
Robert D. Doyle
Keyword(s):  
Subsurface Flow ◽  
Treatment Wetlands ◽  
Light Weight ◽  
Phosphorus Retention ◽  
Dissolved Phosphorus ◽  
Expanded Shale ◽  
Masonry Sand ◽  
Flow Treatment

scholarly journals Time plots, trends and seasonal growth/ decay of Cr removal in vertical subsurface flow sewage treatment wetland

2018 ◽  
Vol 1 (4) ◽  
Author(s):  
Celestin Defo 1 ◽  
Ravinder Kaur 2
Keyword(s):  
Constructed Wetlands ◽  
Sewage Treatment ◽  
Research Work ◽  
Subsurface Flow ◽  
Seasonal Growth ◽  
Treatment Wetland ◽  
Metal Concentrations ◽  
Adsorption Processes ◽  
The Media ◽  
Wastewater Samples

The present research work aimed at analysing the time series and estimation of seasonal growth/ decay of heavy metals dynamics in the vertical subsurface flow constructed wetlands (VSSFCWs) planted with Typha, Phragmites, Vaccha, Arundo and Vetiver on gravel media. Monthly plant and wastewater samples were collected for 15 months from the VSSF CWs. Plant and water samples were pre-treated in the laboratory, digested using diacid and their heavy metal concentrations were determined using atomic absorption spectrophotometer after filtration. The Main results indicated that the maximum uptakes of metals by plant occurred in summer while the minimum plant uptakes were recorded in winter, regardless of metal concentrations applied and the trends showed a slightly stable profile irrespectively to the level of concentration applied. For the adsorption processes of Cr in the media (gravel) of the constructed wetlands, it appeared that this process was not significantly changing as function of time, except for Cr 1.5 ppm.

Plants as ecosystem engineers in subsurface-flow treatment wetlands

2001 ◽  
Vol 44 (11-12) ◽  
pp. 9-17 ◽  
Author(s):  
C.C. Tanner
Keyword(s):  
Root Zone ◽  
Subsurface Flow ◽  
Ecosystem Engineers ◽  
Treatment Wetlands ◽  
Balance Performance ◽  
Key Factors ◽  
Organic Matter Production ◽  
Matter Production ◽  
Solids Removal ◽  
Flow Treatment

Mass balance performance data from side by side studies of planted and unplanted gravel-bed treatment wetlands with horizontal subsurface-flow are compared. Planted systems showed enhanced nitrogen and initial phosphorus removal, but only small improvements in disinfection, BOD, COD and suspended solids removal. Direct nutrient uptake by plants was insufficient to account for more than a fraction of the improved removal shown by planted systems. Roles of plants as ecosystem engineers are summarised, with organic matter production and root-zone oxygen release identified as key factors influencing nutrient transformation and sequestration.

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