scholarly journals The characteristics of sediment pollution and the identification of oxidation layer under long-term operation of large-scale surface flow constructed wetlands

2019 ◽  
Vol 31 (3) ◽  
pp. 677-688
Author(s):  
ZHANG Xue ◽  
◽  
JIANG Cuiling ◽  
ZHU Liqin ◽  
DU Guanchao ◽  
...  
Keyword(s):  
Constructed Wetlands ◽  
Large Scale ◽  
Surface Flow ◽  
Sediment Pollution ◽  
Oxidation Layer ◽  
Term Operation ◽  
Scale Surface ◽  
Surface Flow Constructed Wetlands

Aquatic phytoremediation: Novel insights in tropical and subtropical regions

2010 ◽  
Vol 82 (1) ◽  
pp. 27-38 ◽  
Author(s):  
Eugenia J. Olguín ◽  
Gloria Sánchez-Galván
Keyword(s):  
Constructed Wetlands ◽  
Large Scale ◽  
State Of The Art ◽  
Surface Flow ◽  
Tropical Regions ◽  
Different Types ◽  
Artificial Ecosystems ◽  
Specific Species ◽  
Long Term Studies

An overview of the state of the art in phytofiltration of nutrients and heavy metals (HMs) from wastewaters using tropical and subtropical plants in constructed wetlands (CWs) and lagoons is presented. Various mechanisms to remove these pollutants are discussed, in regard to three different types of systems: surface flow constructed wetlands (SFCWs), subsurface flow constructed wetlands (SSFCWs), and lagoons with floating plants. Only recent reports at laboratory, pilot and full scale, especially in tropical regions, are discussed. Most of the experiences around the world have shown that these systems are efficient and high removal percentages have been reported for both, nutrients and metals. However, there are still several unsolved or partially understood issues. Long-term studies at the mesocosms or large scale, in order to gain a full insight of the various mechanisms occurring in each system, are required. The understanding of the fate or compartmentalization of the pollutants in these complex artificial ecosystems, especially in the case of HMs, will permit us to establish the frequency of harvesting and the advantages of the use of specific species. The huge bio-diversity that is commonly found in tropical and subtropical regions represents a challenge for finding new species with outstanding characteristics for tolerance to toxic and recalcitrant pollutants or to extreme environmental conditions, such as high temperature or salinity.

The integration of constructed wetlands into a treatment system for airport runoff

2001 ◽  
Vol 44 (11-12) ◽  
pp. 469-476 ◽  
Author(s):  
D.M. Revitt ◽  
P. Worrall ◽  
D. Brewer
Keyword(s):  
Constructed Wetlands ◽  
Surface Runoff ◽  
Pilot Scale ◽  
Surface Flow ◽  
Pollutant Removal ◽  
Treatment System ◽  
Effluent Water ◽  
Surface Areas ◽  
Scale Surface ◽  
Surface Flow Constructed Wetlands

A new surface runoff treatment system has been designed for London Heathrow Airport, which incorporates separate floating constructed wetlands or reedbeds and sub-surface flow constructed wetlands as major pollutant removal systems. The primary requirement of the newly developed treatment system is to control the concentrations of glycols following their use as de-icers and anti-icers within the airport. The ability of reedbeds to contribute to this treatment role was fully tested through pilot scale, on-site experiments over a 2 year period. The average reductions in runoff BOD concentrations achieved by pilot scale surface flow and sub-surface flow reedbeds were 30.9% and 32.9%, respectively. The corresponding average glycol removal efficiencies were 54.2% and 78.3%, following shock dosing inputs. These treatment performances are used to predict the required full scale constructed wetland surface areas needed to attain the desired effluent water quality. The treatment system also incorporates aeration, storage and, combined with reedbed technology, has been designed to reduce a mixed inlet BOD concentration of 240 mg/l to less than 40 mg/l for water temperatures varying between 6°C and 20°C.

IDENTIFYING THE MOST SUITABLE AREAS FOR SURFACE FLOW WETLAND CONSTRUCTION IN LITHUANIA

2015 ◽  
Author(s):  
Antanas DUMBRAUSKAS ◽  
Nijolė BASTIENĖ ◽  
Petras PUNYS
Keyword(s):  
Constructed Wetlands ◽  
Ecological Status ◽  
Surface Flow ◽  
Gis Analysis ◽  
Proximity Analysis ◽  
Wetland Construction ◽  
The Mean ◽  
Two Phases ◽  
Terrain Features ◽  
Surface Flow Constructed Wetlands

GIS-based approach to find the suitable sites for surface flow constructed wetlands was employed for the Lithuanian river basins with low ecological status. According to the nature of the analysed criteria the flowchart consists of two phases. Criteria used include hydrographical network, soil properties, terrain features, land use, etc. Some of them have strictly defined values (constraints), and other ranges within certain limits (factors). Limited criteria were analysed using rejection principle and influencing factors using proximity analysis and overlay methods. Selecting the potential sites using standard GIS analysis tools there was estimated about 3286 sites for possible wetlands with the mean area of inflow basin about 4 km2 in the basins of water bodies at risk.

scholarly journals A Combined Approach for Model-Based PV Power Plant Failure Detection and Diagnostic

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1261
Author(s):  
Christopher Gradwohl ◽  
Vesna Dimitrievska ◽  
Federico Pittino ◽  
Wolfgang Muehleisen ◽  
András Montvay ◽  
...  
Keyword(s):  
Power Plants ◽  
Large Scale ◽  
Failure Detection ◽  
Energy Yield ◽  
Combined Approach ◽  
Levelized Cost Of Electricity ◽  
Term Operation ◽  
Model Based

Photovoltaic (PV) technology allows large-scale investments in a renewable power-generating system at a competitive levelized cost of electricity (LCOE) and with a low environmental impact. Large-scale PV installations operate in a highly competitive market environment where even small performance losses have a high impact on profit margins. Therefore, operation at maximum performance is the key for long-term profitability. This can be achieved by advanced performance monitoring and instant or gradual failure detection methodologies. We present in this paper a combined approach on model-based fault detection by means of physical and statistical models and failure diagnosis based on physics of failure. Both approaches contribute to optimized PV plant operation and maintenance based on typically available supervisory control and data acquisition (SCADA) data. The failure detection and diagnosis capabilities were demonstrated in a case study based on six years of SCADA data from a PV plant in Slovenia. In this case study, underperforming values of the inverters of the PV plant were reliably detected and possible root causes were identified. Our work has led us to conclude that the combined approach can contribute to an efficient and long-term operation of photovoltaic power plants with a maximum energy yield and can be applied to the monitoring of photovoltaic plants.

scholarly journals Evaluating the performance of horizontal sub-surface flow constructed wetlands: A case study from southern India

2021 ◽  
Vol 162 ◽  
pp. 106170
Author(s):  
Priyanka Jamwal ◽  
Anjali V. Raj ◽  
Lakshmi Raveendran ◽  
Shahana Shirin ◽  
Stephanie Connelly ◽  
...  
Keyword(s):  
Constructed Wetlands ◽  
Surface Flow ◽  
Southern India ◽  
Surface Flow Constructed Wetlands

scholarly journals Enhanced Benzofluoranthrene Removal in Surface Flow Constructed Wetlands with the Addition of Carbon

ACS Omega ◽  
2021 ◽  
Vol 6 (4) ◽  
pp. 2865-2872
Author(s):  
Qingqing Cao ◽  
Yan Li ◽  
Yan Kang ◽  
Zizhang Guo
Keyword(s):  
Constructed Wetlands ◽  
Surface Flow ◽  
Surface Flow Constructed Wetlands
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