Research on Numerical Simulations of Pollutant of Sewage

2014 ◽  
Vol 522-524 ◽  
pp. 615-618
Author(s):  
Ying Wang ◽  
Wei Ye ◽  
Ming Chang Li
Keyword(s):  
Water Quality ◽  
Numerical Simulations ◽  
Environmental Problem ◽  
Concentration Field ◽  
Water Area ◽  
Marine Water ◽  
Tidal Water ◽  
Hydrodynamic Feature ◽  
And Diffusion

To study the ocean environmental problem, the article analyses and predicts the hydrodynamic feature of study area on the basis of Ecom model. After simulation of the contributed concentration field, the paper assesses the influence of the cyanide in discharge of sewage on the marine water quality nearby. Research shows that the results reflected the rules of transportation and diffusion of pollutants in the tidal water area bitterly.

scholarly journals KAJIAN KESESUAIAN KUALITAS AIR UNTUK PENGEMBANGAN KERAMBA JARING APUNG DI PULAU SERANGAN, BALI

2016 ◽  
Vol 10 (1) ◽  
pp. 75
Author(s):  
N.M. Ernawati ◽  
A.P.W.K. Dewi
Keyword(s):  
Water Quality ◽  
Water Depth ◽  
Lipid Content ◽  
Current Velocity ◽  
Water Area ◽  
Marine Water ◽  
Actual Condition ◽  
Waste Area ◽  
Culture Activity ◽  
Culture Development

The marine water area of Serangan Island has been used for several activities such as aquaculture, captured fisheries, ships transportation, tourism and also area for leachate discharge from Suwung waste area. Those activities resulted in the decrease of water quality which has negative effect on the cage net culture activities, especially that low water quality decrease the immune system of the cultured organisms. So far, the feasibility of water quality for cage net culture activity in Serangan Island has not been identified. The objective of this study is to investigate the water quality and its feasibility for the development of cage net culture activity in that area. This study use descriptive and explorative methods to figure out the actual condition of water quality and its feasibility for cage net culture development in marine water area of Serangan Island. Some measured parameters are water depth, current velocity, temperature, salinity, pH, DO, BOD, Ammonia (NH3-N), oil and lipid content, and lead (Pb). The results show that in Serangan Island marine water area, the water quality range as follow: temperature 26-28 °C; Salinity 23-26,67 ppt; pH 7,4-7,9; dissolved oxygen (DO) 1,5-6 mg.l-1; BOD 6,1-8,2 g.l-1; NH3-N 0,4-0,9 mg.l-1; oil and lipid content <0,1; lead (Pb) cannot detected (<0,0036 mg.l-1); current velocity 0,2-0,6 cm.s-1; and the water depth 5,5 – 9,4 m. Generally, those measured water quality parameters are feasible for marine culture using cage net culture system.

scholarly journals Water Quality Assessment Using Daphnia: A Brief Review

2021 ◽  
Vol 4 (3) ◽  
pp. 111-116
Author(s):  
Clara Rodrigues Pereira ◽  
Lílian Lefol Nani Guarieiro
Keyword(s):  
Systematic Review ◽  
Water Quality ◽  
Quality Assessment ◽  
Water Quality Assessment ◽  
Culture Conditions ◽  
Marine Water ◽  
Review Of The Literature ◽  
Chemical Substances ◽  
Daphnia Species ◽  
Toxicity Level

Due to the need to discover methods that can measure the toxicity level of fresh and marine water quality, this study aimed to present a systematic review of the literature, indicating the culture conditions and toxicological tests used for different Daphnia species in the evaluation of water quality. Thus, the applied methodology was a systematic review that identified studies that addressed the application of Daphnia in the assessment of water quality. The results obtained from this research consisted of a compilation of articles, which presented the parameters most analyzed in Daphnia species, such as mobility and mortality, which can change when exposed to different chemical substances.

Chemometrics data analysis of marine water quality and source identification in Southern Hong Kong

2007 ◽  
Vol 54 (6) ◽  
pp. 745-756 ◽  
Author(s):  
Feng Zhou ◽  
Huaicheng Guo ◽  
Yong Liu ◽  
Yumei Jiang
Keyword(s):  
Water Quality ◽  
Hong Kong ◽  
Data Analysis ◽  
Source Identification ◽  
Marine Water

scholarly journals Turbulent Coagulation of Aerosol Particles: New Insights From Direct Numerical Simulations and Holographic Imaging Experiments

2003 ◽  
Author(s):  
Lance R. Collins ◽  
Hui Meng ◽  
Aruj Ahluwalia ◽  
Lujie Cao ◽  
Gang Pan
Keyword(s):  
Reynolds Number ◽  
Numerical Simulations ◽  
Search Algorithm ◽  
Concentration Field ◽  
Direct Numerical Simulations ◽  
Three Dimensions ◽  
Collision Kernel ◽  
Coagulation Rate ◽  
Subsequent Work ◽  
Turbulent Fluctuations

Particle collisions driven by turbulent fluctuations play a key role in such diverse problems as cloud formation, aerosol powder manufacturing and inhalation drug therapy to name a few. In all of these examples (and many others) turbulent fluctuations increase the rate of collisions relative to the background collision rate driven by Brownian motion. Furthermore, turbulence can spontaneously generate very large fluctuations in the particle concentration field. This “clustering” is caused by the inertial mismatch between the heavy particles and the lighter surrounding gas; vortices in the flow “centrifuge” the heavier particles out of vortex cores and into the straining regions that lie in between the vortices. Because collision is a binary process, concentration fluctuations further enhance the turbulent coagulation rate by as much as two orders of magnitude. An effect of this size must be accounted for in a rational model of turbulent coagulation. Sundaram & Collins (J. Fluid Mech. 1997) showed that the radial distribution function (RDF) of the particle population, evaluated at contact, precisely corrects the collision kernel for clustering. Subsequent work has explored the dependence of the RDF on the system parameters (e.g., particle size, concentration, response time and Reynolds number) using direct numerical simulations. These results have improved our understanding and ability to predict the effect of the first three parameters; however, owing to the limited range of Reynolds number that can be reached in a numerical simulation, questions remain over the scaling of the RDF with Reynolds number. This is a critical issue for high-Reynolds-number applications such as cloud physics, where values of the Reynolds number can be 1–2 orders of magnitude greater than can be simulated. We will present our highest Reynolds number simulations to date and show our attempts to resolve this issue. Recently, the ability to measure three-dimensional particle positions using holography has been realized (e.g., Meng & Pu, J. Opt. Soc. Am. 2003). With holography, the optical image that is produced contains fringes that, upon inverting the laser, reproduce the original image in three dimensions. The hologram can then be scanned using a digital camera to obtain the particle positions. An important consideration with this study is the need to differentiate individual particles. We developed a search algorithm that locates particle centers, even in the presence of optical aberations and speckle noise. The algorithm has been used to obtain the first experimental RDF measurements to date. Thus far we see good agreement between the experimentally obtained RDF and the simulations. Besides validating the simulations, experiments can span a much broader range of Reynolds numbers, providing critical data that may help resolve the open questions associated with this parameter.

Numerical Simulation of Airflow Organization Process during Double Highway Tunnel Fire

2014 ◽  
Vol 501-504 ◽  
pp. 2370-2376
Author(s):  
Hai Yan Wang ◽  
Mei Zhen Chen ◽  
Guo Fa Liu
Keyword(s):  
Pressure Field ◽  
Air Flow ◽  
Concentration Field ◽  
Key Technology ◽  
Tunnel Fire ◽  
Highway Tunnel ◽  
Organization Process ◽  
In Fire ◽  
The Mathematical Model ◽  
And Diffusion

Taking Majiazhai double highway tunnel as a prototype, the mathematical model of double tunnel fire is established to analyze smoke plume spread and diffusion during air flow organization process of highway tunnel fire. In the conditions of double tunnel fire jet fans closed, tunnel jet fans open, ventilators of tunnel and cross-road open simultaneously, the temperature field, pressure field and concentration field of air flow and smoke relative motion are obtained. Then it puts forward that the key technology for smoke countercurrent control in double tunnel fire is to increase the ventilation resistance in fire source upwind cross-road and reduce the air quantity flowing from tunnel jet fans into cross-road.

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