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 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.

Floating Treatment Wetland as an Alternative for Water Quality Improvement: A Preliminary Study

2014 ◽  
Vol 567 ◽  
pp. 68-73 ◽  
Author(s):  
Mohd Noor Nur Asmaliza ◽  
Lariyah Mohd Sidek ◽  
Kah Hoong Kok ◽  
Haron Siti Humaira ◽  
Hidayah Basri
Keyword(s):  
Water Quality ◽  
Quality Improvement ◽  
Removal Efficiency ◽  
Oxygen Demand ◽  
Total Suspended Solid ◽  
Suspended Solid ◽  
Quality Parameters ◽  
Treatment Wetland ◽  
Water Quality Improvement ◽  
Floating Treatment Wetland

Floating treatment wetland (FTW) is one of green innovation in order to enhance water quality as an alternative treatment for water quality improvement. The aim of this study is to identify the capability of floating wetland to remove stormwater pollutant in the river. The lab scale floating treatment wetlands were set up using three different sizes of the floating system with floating mat that made from plastics. Water quality samplings had been conducted starting from 4 December 2012 until 14 December 2012 to evaluate the performance for floating treatment wetland. The results indicate the removal efficiency gradually increased with the hydraulic retention time for water quality parameters such as Total Suspended Solid (TSS), Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Total Phosphorus (TP) and Total Nitrogen (TN) with a range of removal efficiency from 70% to 100%, -5.55% to 88.9%, 9.1% to 68.2%, -8.3% to 63% and 31.4% to 70.3% respectively.

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.

Considering the impact of intermittent discharges when modelling overflows

1998 ◽  
Vol 38 (10) ◽  
pp. 23-30
Author(s):  
Sarah Jubb ◽  
Philip Hulme ◽  
Ian Guymer ◽  
John Martin
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Preliminary Investigation ◽  
Oxygen Demand ◽  
Sediment Oxygen Demand ◽  
Combined Sewer Overflows ◽  
River Hydraulics ◽  
Combined Sewer ◽  
The Impact ◽  
Curve Equation

This paper describes a preliminary investigation that identified factors important in the prediction of river water quality, especially regarding dissolved oxygen (DO) concentration. Intermittent discharges from combined sewer overflows (CSOs) within the sewerage, and overflows at water reclamation works (WRW) cause dynamic conditions with respect to both river hydraulics and water quality. The impact of such discharges has been investigated under both wet and dry weather flow conditions. Data collected from the River Maun, UK, has shown that an immediate, transient oxygen demand exists downstream of an outfall during storm conditions. The presence of a delayed oxygen demand has also been identified. With regard to modelling, initial investigations used a simplified channel and the Streeter-Phelps (1925) dissolved oxygen sag curve equation. Later, a model taking into account hydrodynamic, transport and dispersion processes was used. This suggested that processes other than water phase degradation of organic matter significantly affect the dissolved oxygen concentration downstream of the location of an intermittent discharge. It is proposed that the dynamic rate of reaeration and the sediment oxygen demand should be the focus of further investigation.

Aspects of Water Quality Improvement during Aquifer Storage and Recovery

2001 ◽  
Author(s):  
Simon Toze ◽  
Peter Dillon ◽  
Paul Pavelic ◽  
Brenton Nicholson ◽  
Michel Gibert
Keyword(s):  
Water Quality ◽  
Quality Improvement ◽  
Aquifer Storage And Recovery ◽  
Water Quality Improvement ◽  
Aquifer Storage

Water quality improvement of industrial shrimp ponds

2011 ◽  
Vol 14 (1/2/3/4) ◽  
pp. 182
Author(s):  
Nguyen Thi My Xuan ◽  
Dang Vu Bich Hanh ◽  
Le Thi Hong Tran
Keyword(s):  
Water Quality ◽  
Quality Improvement ◽  
Shrimp Ponds ◽  
Water Quality Improvement
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