scholarly journals Improvement of Suspended Solids Removal Efficiency in Sedimentation Tanks by Increasing Settling Area Using Computational Fluid Dynamics

2019 ◽  
Vol 17 (6) ◽  
pp. 420-431
Author(s):  
The-Anh Nguyen ◽  
Nguyet Thi-Minh Dao ◽  
Mitsuharu Terashima ◽  
Hidenari Yasui
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Removal Efficiency ◽  
Suspended Solids ◽  
Solids Removal

scholarly journals Solids Removal Efficiency of a Sedimentation Tank in a Peri-Urban Catchment

2020 ◽  
Vol 12 (17) ◽  
pp. 7196 ◽  
Author(s):  
Salvatore Falco ◽  
Giuseppe Brunetti ◽  
Giovanna Grossi ◽  
Mario Maiolo ◽  
Michele Turco ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Surface Runoff ◽  
Suspended Solids ◽  
Southern Italy ◽  
Treatment Efficiency ◽  
Urban Catchment ◽  
Sedimentation Tank ◽  
Basin Surface ◽  
Different Grain Size ◽  
Solids Removal

At the outlet of the Vermicelli catchment—a peri-urban area located in the campus of University of Calabria (Cosenza, Southern Italy)—a sedimentation tank is located, aiming at collecting the basin surface runoff and improve its quality. First, experimental results of the treatment effects are here presented and analyzed. In addition, a monitoring campaign was conducted in order to characterize the particles transported by surface runoff and to determine the treatment efficiency of the tank. The analysis showed the presence of a pollutant load in the surface runoff of the Vermicelli basin and provided information on its particle-size distribution (PSD). Results were considered in terms of the treatment efficiency of the sedimentation tank, showing a good overall removal efficiency value, together with a high variability of the removal sedimentation efficiency. This variability is mainly due to the different grain size of the suspended solids and the characteristics of the rainfall event.

scholarly journals Investigation of dust particle removal efficiency of self-priming venturi scrubber using computational fluid dynamics

2018 ◽  
Vol 50 (5) ◽  
pp. 665-672 ◽  
Author(s):  
Sarim Ahmed ◽  
Hassan Mohsin ◽  
Kamran Qureshi ◽  
Ajmal Shah ◽  
Waseem Siddique ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Dust Particle ◽  
Removal Efficiency ◽  
Particle Removal ◽  
Venturi Scrubber

Numerical Investigation of Dusts Removal from Tramway Surface by Street Vacuum Sweeper

2011 ◽  
Vol 236-238 ◽  
pp. 1619-1622 ◽  
Author(s):  
Bo Fu Wu ◽  
Jin Lai Men ◽  
Jie Chen
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Numerical Model ◽  
Pressure Drop ◽  
Removal Efficiency ◽  
Pressure Drops ◽  
Operational Safety ◽  
Airflow Field ◽  
Computational Fluid Dynamics Cfd ◽  
Cfd Method

In order to enhance the operational safety of tram vehicle and reduce the wear of guide wheels mounted on the vehicle, it is necessary to remove particles such as dusts and silts from tramway surface. The aim of this paper is to evaluate the effectiveness of street vacuum sweeper for sucking up dusts from tramway surface. A numerical model was developed based on dusts removal process. Under different pressure drops across the pickup head of the street vacuum sweeper, the flow field and dusts removal efficiency were analyzed with computational fluid dynamics (CFD) method. The numerical results show that a higher pressure drop can improve the airflow field in the pickup head and results in higher dusts removal efficiency, but higher pressure drop definitely need more energy. Therefore, a balance should be taken into consideration.

scholarly journals Treatment of Al Doura Oil Refinery Wastewater Turbidity using Magnetic Flocculation

2019 ◽  
pp. 1-8
Author(s):  
Muzher Al doury ◽  
Hadeel Al samerrai
Keyword(s):  
Removal Efficiency ◽  
Suspended Solids ◽  
Suspended Solid ◽  
Operating Conditions ◽  
Oil Refinery ◽  
Refinery Wastewater ◽  
Turbidity Removal ◽  
Aluminum Sulphate ◽  
Solids Removal ◽  
Oil Refinery Wastewater

The use of conventional flocculants such as Aluminum sulphate (Alum) alone to treat the wastewater may be insufficient to get the required turbidity, suspended solids removal as well as it requires relatively a long residence time. Magnetic flocculation is one of the used techniques for increase the efficiency of the turbidity removal. In the present study, three sets of experiments are carried out in order to investigate the possibility of increasing the suspended solid removal efficiency from Al Doura oil refinery wastewater using iron oxide (Fe3O4), Nickel (Ni), and Cobalt (Co) ferromagnetic powders with alum. The following operating conditions namely, pH, alum dose, ferromagnetic powder dose, and initial turbidity are studied. The results revealed that an improvement in turbidity removal efficiency is satisfied, as well as, a reasonable reduction in the sedimentation period is achieved. The highest turbidity removal is 99.88% that obtained for 122NTU sample for alum dose 120 mg/L+ Nickel dose of 80mg/L and pH of 6.5.

scholarly journals Improvement performance of secondary clarifiers by a computational fluid dynamics model

2011 ◽  
Vol 19 (4) ◽  
pp. 1-11 ◽  
Author(s):  
Ali Ghawi ◽  
J. Kriš
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wastewater Treatment ◽  
Chemical Oxygen Demand ◽  
Biochemical Oxygen Demand ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Design Parameters ◽  
Dynamics Model ◽  
Computational Fluid Dynamics Model

Improvement performance of secondary clarifiers by a computational fluid dynamics model Secondary clarifier is one of the most commonly used unit operations in wastewater treatment plants. It is customarily designed to achieve the separation of solids from biologically treated effluents through the clarification of biological solids and the thickening of sludge. As treatment plants receive increasingly high wastewater flows, conventional sedimentation tanks suffer from overloading problems, which result in poor performance. Modification of inlet baffles through the use of an energy dissipating inlet (EDI) was proposed to enhance the performance in the circular clarifiers at the Al-Dewanyia wastewater treatment plant. A 3-dimensional fully mass conservative clarifier model, based on modern computational fluid dynamics theory, was applied to evaluate the proposed tank modification and to estimate the maximum capacity of the existing and modified clarifiers. A Computational Fluid Dynamics (CFD) model was formulated to describe the tank is performance, and design parameters were obtained based on the experimental results. The study revealed that velocity and (suspended solids) SS is a better parameter than TS (total solids), (Biochemical Oxygen Demand) BOD, (Chemical Oxygen Demand) COD to evaluate the performance of sedimentation tanks and that the removal efficiencies of the suspended solids, biochemical oxygen demand, and chemical oxygen demand were higher in the baffle.

Hybrid filtration method for pre-treatment of stormwater

2010 ◽  
Vol 62 (12) ◽  
pp. 2937-2943 ◽  
Author(s):  
M. A. H. Johir ◽  
S. Vigneswaran ◽  
J. Kandasamy
Keyword(s):  
Removal Efficiency ◽  
Suspended Solids ◽  
Hybrid Filter ◽  
Filtration Method ◽  
Zinc Removal ◽  
Filtration System ◽  
Lead Zinc ◽  
Pre Treatment ◽  
Modified Fouling Index ◽  
Solids Removal

In this study the hybrid filtration process (combining fibre filter with deep bed dual media filtration) was investigated as pre-treatment to stormwater. This process was investigated in-terms of reduction in turbidity, dissolved organic carbon (DOC), colour, headloss development across the filters, suspended solids removal, organic matter removal, nutrients and heavy matter (such as iron, copper, lead, zinc) removal efficiency. A comparison was made between the hybrid filter with single media (sand) deep bed filter and fibre filter. It was found that the hybrid filtration system successfully removed turbidity (98%), colour (99%), suspended solids (99%), and DOC (55%). The removal efficiency of heavy metal was relatively low as the concentration of heavy metals present in stormwater was low. The removal efficiency of nitrate, nitrite and phosphorous (as orthophosphate) was 27, 35 and 72% respectively. Hybrid filtration processes showed a better reduction of Modified Fouling Index (MFI) value (from 15.500 s/l2 to 9 s/l2) compared with single media sand, anthracite and fibre filter which were 35 s/l2, 13 s/l2and 14 s/l2 respectively when operated at FeCl3 dose of 15 mg/l.

Investigation of the Treatment of Wastewater Using Activated Sludge Process

2012 ◽  
Vol 260-261 ◽  
pp. 969-976
Author(s):  
Ayo Samuel Afolabi ◽  
Oluwagbenga Johnson ◽  
Ambali Saka Abdulkareem ◽  
Bada Samson Oluwaseyi
Keyword(s):  
Activated Sludge ◽  
Removal Efficiency ◽  
Maximum Concentration ◽  
Suspended Solids ◽  
Activated Sludge Process ◽  
Nutrients Removal ◽  
Low Concentration ◽  
Effective Application ◽  
Process Operation ◽  
Solids Removal

The treatment of wastewater with activated sludge process has been received with a great attention for decades. However, the effective application of this field is not as widely spread. In this study, the treatment of wastewater was investigated, and samples were collected and ascertained. The process operation was monitored and major observation and findings were noted. Consistent pH of 7.4 was almost maintained. High nutrients removal efficiency was sustained with low concentration of nitrates and phosphates in effluent wastewater. Suspended solids removal was satisfactory, although undesired spike of 19 mg/l and three undesired values beyond >15mg/l were measured. The micronutrient metals such as Al and Zn were found to be high with highest concentration of 113600 mg/kg and 940 mg/kg. The maximum concentration of 300 mg/kg and 332 mg/kg of Mn and Cr respectively were recorded.

The optimization on distributions of flow field and suspended solids in a full-scale high-rate clarifier using computational fluid dynamics

2020 ◽  
Vol 155 ◽  
pp. 107489 ◽  
Author(s):  
Qi Xu ◽  
Keke Xiao ◽  
Qiongxiang Wu ◽  
Hui Wang ◽  
Sha Liang ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Flow Field ◽  
Suspended Solids ◽  
Full Scale ◽  
High Rate
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