Mechanistic understanding of the pollutant removal and transformation processes in the constructed wetland system

2021 ◽  
Author(s):  
Sandeep K Malyan ◽  
Shweta Yadav ◽  
Vikas Sonkar ◽  
V.C. Goyal ◽  
Omkar Singh ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Pollutant Removal ◽  
Wetland System ◽  
Mechanistic Understanding ◽  
Transformation Processes

Pollutant Removal Efficiency of Hybrid Constructed Wetland System for Recycling the Sewage by Utilizing Aquatic Plants

2017 ◽  
Vol 104 (4 - 6) ◽  
Author(s):  
Suganya K ◽  
Keyword(s):  
Removal Efficiency ◽  
Aquatic Plants ◽  
Constructed Wetland ◽  
Industrial Effluents ◽  
Crop Productivity ◽  
Pollutant Removal ◽  
Typha Angustifolia ◽  
Brachiaria Humidicola ◽  
Wetland System ◽  
Pollutant Removal Efficiency

The sewage waters are used as potential source of irrigation for raising vegetables and fodder crops around the sewage disposal sites. Soil contamination by sewage and industrial effluents has affected adversely both soil health and crop productivity. A study was conducted to evaluate the pollutant removal efficiency of lab scale hybrid constructed wetland system (HCWS) for recycling the sewage water for agriculture. Native aquatic plants viz., Brachiaria humidicola and Typha angustifolia were selected and utilized for the lab scale study. The results of this HCWS showed that removal efficiencies of BOD, COD was higher with the hydraulic retention time (HRT) of 5 days due to the combined effect of HF and VF by using the native aquatic plants like Brachiaria humidicola and Typha angustifolia.

An evaluation of pollutant removal from secondary treated sewage effluent using a constructed wetland system

1995 ◽  
Vol 32 (3) ◽  
pp. 87-93 ◽  
Author(s):  
P. R. Thomas ◽  
P. Glover ◽  
T. Kalaroopan
Keyword(s):  
Constructed Wetland ◽  
Control Cell ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Pollutant Removal ◽  
Sewage Effluent ◽  
Effluent Quality ◽  
Treated Sewage ◽  
Wetland System ◽  
Treated Sewage Effluent

Pilot scale investigations were carried out to examine the pollutant removal efficiency of a constructed wetland receiving secondary treated sewage effluent. Four constructed wetland cells were established, three of them planted with either Schoenoplectus validus, Juncus ingens or both species of macrophytes, and the fourth serving as an unvegetated control cell. Although there was a significant improvement in the effluent quality during the initial ten month period of monitoring, results to date have not indicated any overall trend for pollutant removal by a particular plant species. Biochemical oxygen demand and chemical oxygen demand removals averaged between 71-75% while suspended solids removals were around 85% in the macrophyte cells. Ammonia reductions were in the range 17-24% but better nitrate reductions between 65-80% were obtained. Phosphorus removal has been low (13%) in all four of the wetland cells and bore hole samples have shown no groundwater contamination with nitrogen or phosphorus from the wetland system to date.

Pollutant removal capability of a constructed Melaleuca wetland receiving primary settled sewage

1999 ◽  
Vol 39 (6) ◽  
pp. 199-206 ◽  
Author(s):  
Keith G. E. Bolton ◽  
Margaret Greenway
Keyword(s):  
Constructed Wetland ◽  
Surface Flow ◽  
Pollutant Removal ◽  
Organic P ◽  
Tea Tree Oil ◽  
Experimental Site ◽  
Flow Rates ◽  
Tea Tree ◽  
Wetland System ◽  
P Removal

This paper investigates the potential for constructed Melaleuca wetlands to provide buffering for sewage spills. The experimental site was a 4.5 m × 32 m surface flow constructed wetland planted with the tree species M. quinquenervia and M. alternifolia. Primary settled sewage was discharged into the wetland at flow rates of 300 and 600 lh−1, and the concentrations of commonly measured sewage pollutants were monitored at the inlet, middle, and outlet. The constructed wetland was an excellent sediment trap, with TSS removals of up to 98%. BOD5 and turbidity had correspondingly high removals of up to 93% and 97% respectively. At both flow rates there were was 100% reduction in faecal coliform. Nitrogen removal was dependent on the flow rate, with removals of 84% and 58% at 300 and 600 lh−1 respectively. Organic P removal was high, however the wetland system was a source of PO4-P. A conceptual model is presented for a constructed Melaleuca wetland designed for tea tree oil production, effluent polishing and emergency buffering for sewage spills.

scholarly journals Pollutant Removal from Sewage in Tropical Climate by Constructed Wetland System: An Asset for Irrigation

2021 ◽  
Vol 82 ◽  
pp. 20-43
Author(s):  
Boopathy Usharani ◽  
Namasivayam Vasudevan
Keyword(s):  
Constructed Wetland ◽  
Agricultural Sector ◽  
Tropical Climate ◽  
Pollutant Removal ◽  
Agriculture Sector ◽  
First Order Kinetics ◽  
Untreated Sewage ◽  
Wetland System ◽  
Onsite Treatment

In the global outlook, letting of untreated sewage in existing river bodies deteriorates the water quality. The seepage likely depreciates the quality of ground water too. The quality of groundwater with special reference to India has tremendously gone down in the past twenty years leading to sour taste. On the other hand, agriculture sector is deprived of water in many places of India. A solution can be arrived concurrently by treating sewage and consuming the effluent in agricultural sector. First order kinetics was applied in constructed wetland system at different flow rates and optimised. At optimised HLR, effluent met the standards of discharge that can be utilized for agricultural/ irrigational purpose. The emanating major pollutants can be effectively treated using constructed wetland system under tropical climate. A few clippings at the onsite treatment illustrated the diversity of species thus adjoining sustainable biodiversity and treatment. Thus in tropical countries like India, constructed wetland system might pave solution not only for the treatment of sewage but in deploying the effluent in agricultural sector. A clean ecosystem can be achieved with sustainability.

Water Budget of Constructed Wetland System with Subsurface Vertical Flow in Sub-Humid Tropical Climate

2015 ◽  
Vol 1 (5) ◽  
pp. 235-242
Author(s):  
Édio Damásio da Silva Júnior ◽  
Rogério de Araújo Almeida ◽  
Elisa Rodrigues Siqueira ◽  
Ábio Roduvalho da Silva
Keyword(s):  
Constructed Wetland ◽  
Water Budget ◽  
Tropical Climate ◽  
Vertical Flow ◽  
Humid Tropical Climate ◽  
Wetland System
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