scholarly journals Artificial floating islands for water quality improvement

2017 ◽  
Vol 25 (3) ◽  
pp. 350-357 ◽  
Author(s):  
Yueya Chang ◽  
He Cui ◽  
Minsheng Huang ◽  
Yan He
Keyword(s):  
Water Quality ◽  
Quality Improvement ◽  
Constructed Wetlands ◽  
Oxygen Demand ◽  
Key Factors ◽  
Water Quality Improvement ◽  
Factors Influencing ◽  
Wetland Treatment ◽  
Improve Water Quality

Artificial floating islands (AFIs) are a variation of wetland treatment systems for water quality improvement. This paper provides a review concerning AFIs in terms of their development, classification, and applications in the removal of nutrients, heavy metals, and chemical oxygen demand on waterways. The role of microorganisms, aquatic plants, and aquatic animals in AFIs for water decontamination and purification was also discussed. Additionally, some key factors influencing the AFIs’ performances were discussed and comparisons between AFIs and constructed wetlands were reviewed. Finally, further perspectives of artificial floating islands were identified to possibly improve their performances. The understanding of the mechanisms in AFIs that drive removal of various contaminants to improve water quality is crucial, and is also highlighted in this paper.

scholarly journals Macroinvertebrates associated with artificial floating islands installed in River Kshipra for water quality improvement

2020 ◽  
Vol 81 (6) ◽  
pp. 1242-1249
Author(s):  
Prashant ◽  
Suresh Kumar Billore
Keyword(s):  
Water Quality ◽  
Quality Improvement ◽  
River Water ◽  
Oxygen Demand ◽  
Green Technology ◽  
Dual Purpose ◽  
Water Quality Improvement ◽  
Riparian Plants ◽  
Phragmites Karka

Abstract Artificial floating islands (AFIs) are artificial buoyant superstructures vegetated with riparian plant species, especially reed grass (Phragmites karka) floating on waterscape. These structures are mostly installed in lakes and stagnant systems as a green technology for water quality improvement. In the present study, an AFI was installed in the River Kshipra, Ujjain city at a point where wastewater nullah meets the river. The focus was to study the composition of macroinvertebrates associated with AFIs and to monitor AFIs' role in river water quality improvement. The inspection indicated that the coir-based AFIs' substratum supports a variety of macroinvertebrates that are supplementing the role of AFIs for water quality improvement, besides the role of riparian plants. The open river water, far from AFIs, does not support macroinvertebrates in the upper layer of the water column. The installation of AFIs improved the underneath water quality: reducing the pollution load by 46% of total suspended solids (TSS), 51% of turbidity, 37% of total Kjeldahl nitrogen (TKN) and 39% of biochemical oxygen demand (BOD). The AFIs resulted into a development of a floating habitat for diversity of a macroinvertebrates community of predators, filtering collectors, gathering collectors, scrapers and shredders. The AFIs serves a dual purpose: water cleansing green landscape and additional floating niches for aquatic macroinvertebrates.

scholarly journals EFFICACY OF PHRAGMITE KARKA PLANT IN CONSTRUCTED WETLAND SYSTEM

2015 ◽  
Vol 3 (9SE) ◽  
pp. 1-5
Author(s):  
Shalini Saxena
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Quality Improvement ◽  
Constructed Wetland ◽  
Flood Control ◽  
Water Quality Improvement ◽  
The Past ◽  
Wetland Treatment ◽  
Natural Wetlands ◽  
Wetland System

Wetlands, either constructed or natural, offer a cheaper and low-cost alternative technology for wastewater treatment. A constructed wetland system that is specifically engineered for water quality improvement as a primary purpose is termed as a ‘Constructed Wetland Treatment System’ (CWTS). In the past, many such systems were constructed to treat low volumes of wastewater loaded with easily degradable organic matter for isolated populations in urban areas. However, widespread demand for improved receiving water quality, and water reclamation and reuse, is currently the driving force for the implementation of CWTS all over the world. Recent concerns over wetland losses have generated a need for the creation of wetlands, which are intended to emulate the functions and values of natural wetlands that have been destroyed. Natural characteristics are applied to CWTS with emergent macrophyte stands that duplicate the physical, chemical and biological processes of natural wetland systems. The number of CWTS in use has very much increased in the past few years. The use of constructed wetlands is gaining rapid interest. Most of these systems cater for tertiary treatment from towns and cities. They are larger in size, usually using surface-flow system to remove low concentration of nutrient (N and P) and suspended solids. However, in some countries, these constructed wetland treatment systems are usually used to provide secondary treatment of domestic sewage for village populations. These constructed wetland systems have been seen as an economically attractive, energy-efficient way of providing high standards of wastewater treatment by the help of Phragmite karka plant. Typically, wetlands are constructed for one or more of four primary purposes: creation of habitat to compensate for natural wetlands converted for agriculture and urban development, water quality improvement, flood control, and production of food and fiber.

The role of riparian willows in phosphorus accumulation and PCB control for lotic water quality improvement

2014 ◽  
Vol 70 ◽  
pp. 1-10 ◽  
Author(s):  
Maciej Skłodowski ◽  
Edyta Kiedrzyńska ◽  
Marcin Kiedrzyński ◽  
Magdalena Urbaniak ◽  
Katarzyna M. Zielińska ◽  
...  
Keyword(s):  
Water Quality ◽  
Quality Improvement ◽  
Water Quality Improvement ◽  
Phosphorus Accumulation

Optimal location of artificial aeration in a tidal river for water quality improvement

2000 ◽  
Vol 42 (3-4) ◽  
pp. 397-402
Author(s):  
S. Li ◽  
G.H. Chen ◽  
B.C. Yen
Keyword(s):  
Water Quality ◽  
Quality Improvement ◽  
Oxygen Demand ◽  
Reaction Rates ◽  
Sediment Oxygen Demand ◽  
Tidal River ◽  
Optimal Position ◽  
Water Quality Improvement ◽  
Artificial Aeration ◽  
Saint Venant Equations

Artificial aeration is one of the alternatives proposed for the improvement of DO level of the Shing Mun River in Hong Kong. This study employs Saint Venant equations and one-dimensional water quality models to simulate the hydrodynamics and DO distributions in the river, respectively. Processes affecting the river quality, such as biochemical degradation, oxygen production and consumption by algae and sediment oxygen demand are considered in the models. In-situ and laboratory tests were conducted to determine the values of reaction rates of these processes. By comparing the simulated results of DO concentration under different locations of the aeration equipment along the river with the present DO condition during spring and neap tides, the optimal position of artificial aeration is determined based on the effectiveness of water quality improvement. The effect of intermittent aeration and that of continuous aeration are compared and it is found that the increase of DO in the intermittent aerationcase is about 50% of that in the continuous case on the cross-section of aeration. The influence of water temperature on the aeration is also discussed.

scholarly journals Constructed Wetlands as a Natural Resource for Water Quality Improvement in Malaysia

2014 ◽  
Vol 05 (07) ◽  
pp. 292-298 ◽  
Author(s):  
Syafiq Shaharuddin ◽  
Ngai Weng Chan ◽  
Nor Azazi Zakaria ◽  
Aminuddin Ab Ghani ◽  
Chun Kiat Chang ◽  
...  
Keyword(s):  
Water Quality ◽  
Quality Improvement ◽  
Constructed Wetlands ◽  
Natural Resource ◽  
Water Quality Improvement
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