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An expanded granular sludge bed packed with porous sponge was started to treat wastewater contaminated by sulfide, nitrate, nitrite and organic carbon compounds. In inflow wastewater, potassium nitrate and sodium nitrite acted as electron acceptors, sodium sulfide acted as electron donor and glucose acted as organic carbon source. In the anoxic reactor, autotrophic denitrification happened together...
The effect of nitrite loading rate, organic carbon category and loading rate was investigated on simultaneous removal of organic carbon, sulfide, nitrate and nitrite by the mixotrophic denitrification and desulfurization process. This simultaneous respiratory process could be explained in terms of the microbial diversity. The 50 mgC/(L·d) of glucose and 25 mgC/(L·d) of acetate sodium were suitable...
In order to obtain a precise mathematical model of an autonomous underwater vehicle (AUV), model identification based on maximum likelihood relaxation algorithm is proposed in this paper. With experiment data of zigzag motion, the hydrodynamic derivatives of the AUV are estimated, and ideal convergence of maximum likelihood relaxation algorithm can be obtained from the contrast with normal approach...
The present oil spill models are usually based on sea surface, while few of them are for submarine oil spill. Therefore, modeling and simulation for submarine pipeline oil spill is discussed by FLUENT in this paper to forecast the trajectory of oil. The coupling of pressure and velocity under unsteady-state condition is solved by pressure implicit with splitting of operators algorithm, and the boundary...
Because of small volume of the mini autonomous underwater vehicle, the ability to resist the wave and the current disturbance is not ideal enough. The present motion models ignore the effect of the external disturbance, and even ignore the fin effective angle of attack. In this paper, we establish a dynamic motion model of the mini autonomous underwater vehicle which can describe the motion accurately...
In order to explore the motion law of oil spill to conduct cleaning, simulation for submarine oil spill based on wave motion is carried out by user defined function and volume of fluid in FLUENT, and the dispersion and diffusion of oil spill in deep sea is simulated dynamically. Also the oil spill processes with different wavelength and current velocity are compared and analyzed. The results show...
Grey system theory is widely used in various environmental quality assessments for the grey characteristic of environmental system. In this paper, according to grey theory, a grey correlative model which is variable weights and based on water chemistry and productivity indicators is constructed to evaluate the marine environmental quality of Shenzhen Bay. The results show that the sea water quality...
The Princeton Ocean Model (POM) is a three-dimensional baroclinic ocean model based on the original equations, using a sigma coordinate in the vertical coordinate to deal with significant topographical variability, and has been widely used for estuary and coastal ocean simulation. Wetting and drying is a common and important phenomenon of the coastal ocean, and the process could not be simulated by...
The wall thickness of formed micro tubes is not uniformly distributed and is difficult to control. The macro mechanics FE modelling can not be used to simulate such effects in micro tubes hydroforming processes. In this paper, a simplified plain strain Crystal Plasticity Finite Element (CPFE) based modelling technique has been developed and used to capture the localized thinning and failure features...
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