scholarly journals Evaluating macrophyte selection and germination protocols to enhance nutrient sequestration in engineered wetland models

2021 ◽  
Author(s):  
Francesca Mary Fernandes
Keyword(s):  
Constructed Wetland ◽  
Selection Criteria ◽  
Aquatic Macrophytes ◽  
Phosphorus Concentration ◽  
Biological Impact ◽  
Native Flora ◽  
Non Invasive ◽  
Lack Of Information ◽  
Engineered Wetland ◽  
Nutrient Sequestration

Research examining contaminant sequestration using engineered wetlands has been conducted for many years but the implementation of sustainable, biodiverse strategies is still in its infancy. A major gap in knowledge still exists regarding the kinds of macrophytes to be selected, especially the inclusion of non-invasive native flora. There is a lack of information about macrophyte selection criteria and germination protocols. Thus, this study attempted to redress this dearth in knowledge. The first part of this thesis critically assessed a list of macrophytes provided by Environment Canada (1996) and created “selection criteria” for choosing specific macrophytes. Germination protocols were then compiled to determine and outline optimized germination protocols for these aquatic macrophytes. In the second part of this study, two different constructed wetlands models were designed for laboratory purposes (a “floating” constructed wetland model and a “stationary” constructed wetland model). Water samples were assed for biological impact and phosphorus concentration.

scholarly journals Evaluating macrophyte selection and germination protocols to enhance nutrient sequestration in engineered wetland models

2021 ◽  
Author(s):  
Francesca Mary Fernandes
Keyword(s):  
Constructed Wetland ◽  
Selection Criteria ◽  
Aquatic Macrophytes ◽  
Phosphorus Concentration ◽  
Biological Impact ◽  
Native Flora ◽  
Non Invasive ◽  
Lack Of Information ◽  
Engineered Wetland ◽  
Nutrient Sequestration

Research examining contaminant sequestration using engineered wetlands has been conducted for many years but the implementation of sustainable, biodiverse strategies is still in its infancy. A major gap in knowledge still exists regarding the kinds of macrophytes to be selected, especially the inclusion of non-invasive native flora. There is a lack of information about macrophyte selection criteria and germination protocols. Thus, this study attempted to redress this dearth in knowledge. The first part of this thesis critically assessed a list of macrophytes provided by Environment Canada (1996) and created “selection criteria” for choosing specific macrophytes. Germination protocols were then compiled to determine and outline optimized germination protocols for these aquatic macrophytes. In the second part of this study, two different constructed wetlands models were designed for laboratory purposes (a “floating” constructed wetland model and a “stationary” constructed wetland model). Water samples were assed for biological impact and phosphorus concentration.

A constructed wetland system with aquatic macrophytes for cleaning contaminated runoff/storm water from urban area in Florida

2021 ◽  
Vol 280 ◽  
pp. 111794
Author(s):  
Jinqi Wang ◽  
Weimu Wang ◽  
Jibing Xiong ◽  
Liguang Li ◽  
Biying Zhao ◽  
...  
Keyword(s):  
Urban Area ◽  
Constructed Wetland ◽  
Aquatic Macrophytes ◽  
Storm Water ◽  
Wetland System

Phosphorus recovery from sewage with a sustainable and low-cost treatment system

2019 ◽  
Vol 80 (5) ◽  
pp. 846-854
Author(s):  
Vitor Tonzar Chaves ◽  
Dione Mari Morita ◽  
Iara Regina Soares Chao ◽  
Ronan Cleber Contrera
Keyword(s):  
Constructed Wetland ◽  
Phosphorus Removal ◽  
Phosphorus Recovery ◽  
Maximum Efficiency ◽  
Integrative Approach ◽  
Isotherm Models ◽  
Phosphorus Concentration ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Initial Ph

Abstract This study proposes a technology conceived based on an integrative approach that aims to promote phosphorus recovery and to recycle ferric water treatment sludge (FWTS), using it as a phosphorus adsorbent which may be applied as a soil ameliorant after reaching saturation. The assessed pilot plant operated with a daily influent flow of 360 litres and presented a removal efficiency of 94.4% ± 3.2% for chemical oxygen demand (COD) and of 91.2% ± 7.8% for suspended solids. It also presented promising results for phosphorus removal. The maximum efficiency of dissolved reactive phosphorus removal was 95% on the first day and it decreased until reaching adsorbent saturation. The estimated breakthrough time was one year in the condition in which the filling medium of a second constructed wetland was only FWTS. In this situation, the effluent phosphorus concentration was 0.2 mg·L−1. The authors concluded that the application of FWTS in a constructed wetland bed is an interesting alternative. Batch adsorption experiments were run using phosphorus stock solution. Langmuir and Freundlich adsorption isotherm models were obtained for different initial pH values. The maximum adsorption capacity decreased as the initial pH was increased; values ranged from 4.76 mg P·g−1 (pH = 3.9) to 1.44 mg P·g−1 (pH = 9.0).

scholarly journals Laboratory tests of Estonian landfill leachate

2019 ◽  
pp. 289-299
Author(s):  
Pille Kängsepp ◽  
William Hogland ◽  
Mait Kriipsalu ◽  
Toomas Timmusk
Keyword(s):  
Constructed Wetland ◽  
Landfill Leachate ◽  
Laboratory Tests ◽  
Nitrogen Compounds ◽  
Multiple Treatment ◽  
Different Types ◽  
Treatment Stage ◽  
Before And After ◽  
Purification Methods ◽  
Engineered Wetland

During the last decade, many laboratory, pilot and full-scale experiments have beenconducted to investigate the optimal low-tech purification methods for the treatment ofnumerous types of wastewaters. Constructed wetland is a low-tech treatment system, whichusually contains multiple treatment possibilities. Frequently, some kind of soil treatmentsystem is included as one treatment stage. Engineered wetland systems for purification ofwastewater and leachate are not yet widely spread in Estonia. The possibility to use peat asfilter media for treatment of leachate from Aardlapalu landfill (Tartu County, Estonia) hasbeen studied. The leachate was transported into the laboratory, aerated and percolated throughtwo different types of peat filters. The concentration of nitrogen compounds, COD and BODwas measured in the leachate before and after treatment. Hydrological consequences andchemical changes in the peat were investigated.

Emerging Star in Ophthalmic Imaging Technologies – OCT Angiography

2016 ◽  
Vol 10 (01) ◽  
pp. 27
Author(s):  
Lukas Reznicek ◽  
Keyword(s):  
Imaging Techniques ◽  
Three Dimensional ◽  
Oct Angiography ◽  
Non Invasive ◽  
Narrow Angle ◽  
Lack Of Information ◽  
Ophthalmic Imaging ◽  
High Resolution Images ◽  
Angle Of View ◽  
Areas Of Interest

Optical Coherence Tomography (OCT) angiography has recently been introduced as a novel non-invasive OCT based technique providing three-dimensional high resolution images of vascular and microvascular ocular structures without the need to use intravenous dyes. A relatively narrow angle of view and a lack of information along the timeline are outweighed by the huge advantages of non-invasiveness and three-dimensional information of the depicted areas of interest, as this technique emerges and becomes the new star among ophthalmic imaging techniques.

scholarly journals Selecting system architecture: What a single industrial experiment can tell us about the traps to avoid when choosing selection criteria

2016 ◽  
Vol 30 (3) ◽  
pp. 250-262 ◽  
Author(s):  
Marie-Lise Moullec ◽  
Marija Jankovic ◽  
Claudia Eckert
Keyword(s):  
System Architecture ◽  
Selection Criteria ◽  
Architecture Design ◽  
System Architectures ◽  
Industrial Experiment ◽  
Lack Of Information ◽  
Conflicting Objectives ◽  
Support Tools ◽  
Audio Recordings ◽  
System Architecture Design

AbstractDecisions related to system architecture are difficult because of fuzziness and lack of information combined with often-conflicting objectives. We organized an industrial workshop with the objective of choosing 5 out of 800 architectures. The first step, the identification of selection criteria, proved to be the greatest challenge. As a result, designers selected system architectures that did not satisfy them without being able to explain why. It appeared that most of the difficulties faced by the designers came from the criteria used for architecture selection. This study aims to identify what made the selection criteria difficult to use. The audio recordings of the workshop were transcribed and analyzed in order to identify the obstacles related to the definition and the use of selection criteria. The analysis highlights two issues: the interdisciplinarity of system architecture makes criteria interdependent and the lack of information makes it impossible to define an exhaustive set of criteria. Finally, this study provides recommendations for selecting appropriate selection criteria and insights for future selection support tools dedicated to system architecture design.

scholarly journals Potential of Salivary Biomarkers in Autism Research: A Systematic Review

2021 ◽  
Vol 22 (19) ◽  
pp. 10873
Author(s):  
Katarína Janšáková ◽  
Klaudia Kyselicová ◽  
Daniela Ostatníková ◽  
Gabriela Repiská
Keyword(s):  
Autism Spectrum ◽  
Diagnostic Process ◽  
Suitable Alternative ◽  
Autism Research ◽  
Non Invasive ◽  
Current State ◽  
Lack Of Information ◽  
Protein Molecules ◽  
Saliva Collection ◽  
Spectrum Disorders

The diagnostic process for autism spectrum disorders (ASD) is based on a behavioral analysis of the suspected individual. Despite intensive research, no specific and valid biomarker has been identified for ASD, but saliva, with its advantages such as non-invasive collection, could serve as a suitable alternative to other body fluids. As a source of nucleic acid of both human and microbial origin, protein and non-protein molecules, saliva offers a complex view on the current state of the organism. Additionally, the use of salivary markers seems to be less complicated not only for ASD screening but also for revealing the etiopathogenesis of ASD, since enrolling neurotypical counterparts willing to participate in studies may be more feasible. The aim of the presented review is to provide an overview of the current research performed on saliva in relation to ASD, mutual complementing, and discrepancies that result in difficulties applying the observed markers in clinical practice. We emphasize the methodological limitations of saliva collection and processing as well as the lack of information regarding ASD diagnosis, which is critically discussed.

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