Applied Mechanics and Materials Vols. 178-181

Abstract: To study the permeation mechanics during the impregnation of carbon graphite for mechanical applications, a permeation test with single-phase water saturated is conducted on carbon graphite porous medium, testing the permeability of the porous medium. The result of the test shows that the porosity of carbon graphite for mechanical applications is between 9.24% ~27.41% and the permeability of the samples is not a fixed value, averagely between 0.071mD and 9.953mD; and that the permeability of porous carbon graphite is resulted from the factors of pore structure properties of the porous medium, permeation force field and fluids properties. Based on the rules of permeability and permeation speed change, the permeability of carbon graphite porous medium can be classified into three categories: low-high-stable permeability, fluctuating permeability, and decreasing permeability.

Abstract: For treating reservoir water from Yellow river, by dosing 2mg/L FeCl₃ to PAC-MBR, the effect of FeCl₃ coagulant on the performance of PAC-MBR was studied. It could be concluded that membrane had an absolute removal of particles, and the dosing of coagulant gave no influence on the removal of turbidity. The dosing of FeCl₃ coagulant could restrict the removal of ammonia, but there was still a relatively high removal rate of ammonia by 75%; the mechanism of coagulation could increase the removal of organic matter, from 23.05% to 36.39% for CODMn and from 14.68% to 24.78% for UV₂₅₄.

Abstract: A study on the decolorization of azo dye wastewater by sponge iron was carried out in order to establish a model of decolorization kinetics, and to investigate the effects of particle size of sponge iron, the initial pH of azo dye wastewater and reaction temperature on the reaction rate constant. The results showed that the decolorization processes of azo dye wastewater by sponge iron was first order kinetic reaction, and reaction rate constant presented high value on the condition of small particle size of sponge iron, low initial pH of azo dye wastewater and high reaction temperature.

Abstract: In poly ferric sulfate production process with pyrite cinder as the main raw material, the sodium nitrite as catalyst is too toxic to be used largely. By orthogonal experiment and single factor experiments, the best reaction conditions were studied for the sodium nitrite as the catalyst, the amount of catalyst is 0.8%, the reaction temperature is 50°C and the reaction time is 60 minutes. According these conditions, the catalyst (CH-2) was used to promote the oxidation-polymerization reaction. Results showed that the use of this non-sodium nitrite catalyst could not eliminate the product toxicity that would be caused by using sodium nitrite catalyst but also make the toxicity of PFS was eliminated and the performance was better.

Abstract: The spent fuel can be treated by solvent extraction. In the process of extraction, the performance of the extraction will be serious deterioration by the effect of radioactive radiation, chemical reaction, light and heat, it will be a new waste and harm human being and pollute environment seriously. In this paper, four different advanced oxidation processes (UV/H2O2,UV/Fenton,O3 and O3/Fenton)were used to treat the wastewater containing extractant. All of these four methods, at presumed conditions, could result in high COD removal efficiencies, and the removal rate of COD reached 80% or above when the wastewater was treated 3 hours.When the wastewater was treated by pretreatment/O3/Fenton, the COD and removal efficiency of the effluent were 247mg/L,94.5% respectively, at the O3 dose of 1000 mg/L with 72 ml/L H2O2.

Abstract: A electron-rich unit, 2,7-bis(5-bromothiophen-2-yl)-9,9'-spirobi[fluorene] has been prepared in high yield over five steps. The compound with good electronic and optical properties may be a candidate for D-A type organic polymers.

Abstract: Compound [Li₃Mn_0.5Ti_0.25O₃] was prepared by a solid state reaction crystallization method. It was an inverse spinel-type metal compound. The extraction/insertion reaction with this material was investigated by X-ray, saturation capacity of exchange, and Kd measurement. The acid treated samples had an ion exchange capacity of 9.7mmol/g for Li+.

Abstract: Inorganic ion exchanger (Li3Mn0.25Ti0.5O3) with an inverse spinel structure was synthesized by solid state reaction crystallization method. The results showed that the Li+ extraction/insertion be progressed mainly by an ion-exchange mechanism. The acid treated samples had an ion exchange capacity of 9.2mmol/g for Li+.

Abstract: The ion-exchanger Li3Mn0.75O3 of spinel type was prepared by a solid state reaction crystallization method. The results showed that the Li+ extraction/insertion be progressed mainly by an ion-exchange mechanism. The acid treated samples had an ion exchange capacity of 8.3mmol/g for Li+.

Abstract: This paper describes a novel laboratory technique for characterizing the scale inhibitors performance of reverse osmosis. The experiment was carried out by operating the RO system in a once-through flow mode which was operated by continuous withdrawal of concentrate and permeate. The concentration ratio of reverse osmosis system is calculated by mass or flow or volume of permeate and concentrate. The performance of scale inhibitors was evaluated according to the scale ion concentration of concentrate. The results showed that the method can screen out the performance of anti-scalants quickly and with low error.