Effects of salinity on purification efficiency of constructed wetland with mangrove plant Rhizophora stylosa for eutrophic wastewater treatment

2011 ◽  
Author(s):  
Yougui Peng ◽  
Minchao Liu ◽  
Zhanghe Chen ◽  
Guizhu Chen
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetland ◽  
Mangrove Plant ◽  
Rhizophora Stylosa ◽  
Purification Efficiency

scholarly journals Integrating MFT-qPCR techniques in constructed wetland faecal bacterial purification monitoring; a case of a typical tropical hybrid constructed wetland system

2018 ◽  
Vol 78 (9) ◽  
pp. 2008-2018 ◽  
Author(s):  
Donde Oscar Omondi ◽  
Muia Anastasia Wairimu ◽  
Makindi Stanley Maingi ◽  
Onyango Godfrey Otieno ◽  
Kibet Caroline Jepkorir ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetlands ◽  
Constructed Wetland ◽  
Membrane Filtration ◽  
Pathogenic Bacteria ◽  
Quantitative Polymerase Chain Reaction ◽  
Health Concern ◽  
Human Pathogens ◽  
Purification Efficiency ◽  
Wetland System

Abstract The sanitation control of pathogens in the tropical effluents needs much more attention to ensure ecosystem health integrity and the safety of human health. The common use of chemicals in achieving this in wastewater treatment has remained unsustainable due to much health concern. Indeed, based on the numerous challenges associated with faecal pathogenic bacteria in wastewaters, the focus is now on achieving higher purification efficiencies in the elimination of the human pathogens from wastewater through eco-sustainable systems such as constructed wetlands (CWs). Hence, the need to explore the application of constructed wetlands in wastewater treatment under specific local environmental conditions for accurate understanding and improved treatment efficiency. This study therefore aimed at monitoring constructed wetlands faecal bacteria purification efficiency through integrated non-molecular membrane filtration technique and molecular quantitative polymerase chain reaction (MFT-qPCR) technique. The results showed some shortfall in the treatment system and also proved that integrating MFT-qPCR in faecal bacterial purification monitoring within a constructed wetland system provides a more accurate and reliable outcome. Additionally, the wetland purification efficiency was low (<80%) with the dissolved oxygen posing the strongest influence on faecal pathogenic bacterial purification trend across the wetland. Hence, the need to regularly carry out dredging and macrophyte harvesting as well as the use of holistic and more integrative approaches such as MFT-qPCR in managing and monitoring the performance of CWs in faecal pathogen eradication for improved CWs purification efficiency.

Bioreactor septic tank for on-site wastewater treatment: floating constructed wetland integration

2021 ◽  
pp. 105606
Author(s):  
Tanveer Saeed ◽  
Rumana Afrin ◽  
Abdullah Al-Muyeed ◽  
Md Jihad Miah ◽  
Hasin Jahan
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetland ◽  
Septic Tank

A constructed wetland model for synthetic reactive dye wastewater treatment by narrow-leaved cattails (Typha angustifolia Linn.)

2009 ◽  
Vol 60 (6) ◽  
pp. 1565-1574 ◽  
Author(s):  
S. Nilratnisakorn ◽  
P. Thiravetyan ◽  
W. Nakbanpote
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetland ◽  
Cell Structure ◽  
Salt Content ◽  
Textile Wastewater ◽  
Reactive Dye ◽  
Wastewater Management ◽  
Textile Dye ◽  
Dye Wastewater ◽  
Term Operation

Textile wastewater is contaminated by reactive dye causing unattractive levels of wastewater color, high pH and high salt content when discharged into public water systems. Decolorization of textile wastewater by plant, phytoremediation, is an alternative, sustainable method which is suitable for long term operation. Narrow-leaved cattails are one species of wetland plant with efficiency for decolorizing and remediating textile wastewater. In addition, chemical oxygen demand (COD) can be lowered and dye residue can be removed. The plant also showed a good salt tolerance even after being exposed to a salt solution for 15 days. The narrow-leaved cattails were set up in a constructed wetland model with a vertical flow system operating from bottom to top for synthetic reactive dye wastewater (SRDW) removal. Narrow-leaved cattails could achieve the removal of SRDW at approximately 0.8 gSRDW m−2 day−1. Decolorization of SRDW by this plant was approximately 60%. The advantage of this method is that it is suitable for textile wastewater management and improvement of wetland. These plants could lower COD, remove dye, sodium and total dissolved solids (TDS) whereas other biological and chemical methods could not remove TDS and dye in the same time. These results suggested that the spongy cell structure of this plant has the ability to absorb large amounts of water and nutrients. Physico-chemical analysis revealed increasing amounts of sulfur, silicon, iron and calcium in the plant leafs and roots after exposure to wastewater. Proteins or amide groups in the plant might help in textile dye removal. Regarding decolorization, this plant accumulates dye in the intercellular space and still grows in this SRDW condition. Hence, it can be noted here that narrow-leaved cattails are efficient for textile dye wastewater treatment.

Response of constructed wetland for wastewater treatment to graphene oxide: perspectives on plant and microbe

2021 ◽  
pp. 126911
Author(s):  
Chunni Yan ◽  
Juan Huang ◽  
Chong Cao ◽  
Yaoyao Wang ◽  
Xiaoyang Lin ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Graphene Oxide ◽  
Constructed Wetland
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