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.

scholarly journals Treatment of Combined Dairy and Domestic Wastewater with Constructed Wetland System in Sicily (Italy). Pollutant Removal Efficiency and Effect of Vegetation

Water ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1086
Author(s):  
Mario Licata ◽  
Roberto Ruggeri ◽  
Nicolò Iacuzzi ◽  
Giuseppe Virga ◽  
Davide Farruggia ◽  
...  
Keyword(s):  
Plant Growth ◽  
Organic Compounds ◽  
Removal Efficiency ◽  
Constructed Wetland ◽  
Organic Pollutant ◽  
Dairy Farm ◽  
Domestic Wastewater ◽  
Pollutant Removal ◽  
Dairy Wastewater ◽  
Giant Reed

Dairy wastewater (DWW) contains large amounts of mineral and organic compounds, which can accumulate in soil and water causing serious environmental pollution. A constructed wetland (CW) is a sustainable technology for the treatment of DWW in small-medium sized farms. This paper reports a two-year study on the performance of a pilot-scale horizontal subsurface flow system for DWW treatment in Sicily (Italy). The CW system covered a total surface area of 100 m2 and treated approximately 6 m3 per day of wastewater produced by a small dairy farm, subsequent to biological treatment. Removal efficiency (RE) of the system was calculated. The biomass production of two emergent macrophytes was determined and the effect of plant growth on organic pollutant RE was recorded. All DWW parameters showed significant differences between inlet and outlet. For BOD5 and COD, RE values were 76.00% and 62.00%, respectively. RE for total nitrogen (50.70%) was lower than that of organic compounds. RE levels of microbiological parameters were found to be higher than 80.00%. Giant reed produced greater biomass than umbrella sedge. A seasonal variation in RE of organic pollutants was recorded due to plant growth rate Our findings highlight the efficient use of a CW system for DWW treatment in dairy-cattle farms.

Development and verification of a general approach to describe the efficiency of vortex separators in combined sewer systems

2007 ◽  
Vol 55 (4) ◽  
pp. 165-173
Author(s):  
T. Mietzel ◽  
K. Klepiszewski ◽  
G. Weiss
Keyword(s):  
Removal Efficiency ◽  
Large Scale ◽  
Cost Effective ◽  
Large Error ◽  
Simulation Software ◽  
Pollutant Removal ◽  
Attractive Alternative ◽  
Dynamic Approach ◽  
General Applicability ◽  
Pollutant Removal Efficiency

The water framework directive (CEC, 2000) asks for cost-effective measures for achieving good ecological conditions in receiving waters. Because of low operation costs and good pollutant removal efficiency, vortex separators (VS) are an attractive alternative to traditional stormwater tanks. The German design standard for CSO structures, ATV-A 128 (1992), demands long-term pollution load simulations. Today's simulation software, however, considers the removal processes in CSO structures either very rudimentarily or not at all. The higher pollutant removal efficiency of a structure like a VS cannot be taken into account. This might be one reason why VS are used still comparatively scarcely. A mathematical model describing the removal efficiency could increase the acceptance of VS. Several functions describing the removal efficiency have been derived from model tests or large-scale studies within the last few years. Within this paper, the data from three large-scale studies are used to verify the general applicability of one steady-state and one dynamic approach. The results show that the complex processes involved with CSO facilities and the large error related to monitoring make the validation of models a difficult task. Anyhow, especially the dynamic approach was applicable at all considered facilities.

scholarly journals Improving the pollutant removal efficiency of packed-bed plasma reactors incorporating ferroelectric components

2017 ◽  
Vol 314 ◽  
pp. 311-319 ◽  
Author(s):  
Ana Gómez-Ramírez ◽  
Antonio M. Montoro-Damas ◽  
Miguel A. Rodríguez ◽  
Agustín R. González-Elipe ◽  
José Cotrino
Keyword(s):  
Removal Efficiency ◽  
Packed Bed ◽  
Pollutant Removal ◽  
Plasma Reactors ◽  
Pollutant Removal Efficiency

scholarly journals Constructed wetlands in the treatment of agro-industrial wastewater: A review

2015 ◽  
Vol 69 (2) ◽  
pp. 127-142 ◽  
Author(s):  
Mar-Yam Sultana ◽  
Christos Akratos ◽  
Dimitrios Vayenas ◽  
Stavros Pavlou
Keyword(s):  
Constructed Wetlands ◽  
Constructed Wetland ◽  
Municipal Wastewater ◽  
Industrial Effluents ◽  
Design Tool ◽  
Pollutant Removal ◽  
Toxic Substances ◽  
Wetland Type ◽  
Industrial Wastewaters ◽  
Hostile Environments

Due to their simplicity and low operation cost, constructed wetlands are becoming more prevalent in wastewater treatment all over the world. Their range of applications is no longer limited to municipal wastewater but has expanded to the treatment of heavily polluted wastewaters such as agro-industrial effluents. This paper provides a comprehensive literature review of the application of constructed wetlands in treating a variety of agro-industrial wastewaters, and discusses pollutant surface loads and the role of constructed wetland type, prior-treatment stages and plant species in pollutant removal efficiency. Results indicate that constructed wetlands can tolerate high pollutant loads and toxic substances without losing their removal ability, thus these systems are very effective bio-reactors even in hostile environments. Additionally, the review outlines issues that could improve pollutant treatment efficiency and proposes design and operation suggestions such as suitable vegetation, porous media and constructed wetland plain view. Finally, a decision tree for designing constructed wetlands treating agro-industrial wastewaters provides an initial design tool for scientists and engineers.

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