Applied Mechanics and Materials Vols. 178-181

Abstract: The YVO₄ was synthesized by microwave assisted process. The products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Vis diffuse reflectance spectroscopy (DRS), thermogravimetry and differential thermal analysis (TG-DTA) and Brunauer-Emmett-Teller (BET) method. The results show that YVO₄ was tetragonal crystal, particle size of 50 to 80 nm, band gap of 3.3 eV and surface area of 18.6m²/g. The photocatalytic experiment of YVO₄ shows the high photocatalytic activity for the decomposition of methyl orange under UV-light irradiation.

Abstract: The single phase BiTaO₄ was synthesized using Ta₂O₅ and Bi(NO₃)₃ as main raw materials by precipitation process. The products were characterized by thermogravimetry and differential thermal analysis (TG-DTA), powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-visible diffuse reflectance spectroscopy (DRS). The results show that BiTaO₄ was triclinic crystal with average particle size 100nm, and a band gap of about 2.77 eV. The photocatalytic experiment of BiTaO₄ shows the good photocatalytic activity for the decomposition of methylene blue under visible-light irradiation.

Abstract: Using comblike polymer PAALi-g-PEO as matrix, PAALi-g-PEO/LiClO₄/LiTi₂(PO₄)₃ polymer electrolyte was prepare by casting. XRD, IR, SEM were used to study the effects of LiTi_{2(PO4)3 Ultrafine Powder on the conductive properties of polymer electrolyte, and electrochemical impedance spectroscopy was used to test the ionic conductivity of polymer electrolyte. The results show that there is a " competitive complexation" between LiClO4 and LiTi2(PO4)3 with PAALi-g-PEO, which can improve the surface morphology of polymer electrolyte; the conductivity of the polymer electrolyte reaches to a maximum of 4.6 x 10-5Scm-1, and is improved by 2 to 3 orders of magnitude compared with PEO/lithium salt system.}

Abstract: China is a big country of coal production, in the coal mining process, the great massive mine drainage has caused not only the waste of groundwater resource, but also environmental pollution. On the other hand, mining production and life supply water is very scarce. According to the mine water features, the majority of mine drainage water belonging to the mine water containing suspended, the mine water needs to do the necessary purification then can be used. That purification mainly eliminates is the suspended. In this paper, the method of purification and the technological process about mine water are discussed. The main methods of handling are coagulation, sedimentation, filtration and disinfection. According to different characteristics of water quality, different ways of handling and technological processes have to be chosen. Finally, the purification and utilization of mine water are shown through practical examples, Pingdingshan Coal Group Company, Wannian Coal Mine of Fengfeng Group Limited Company and Tangshan Coal Mine of Kailuan Group Company, to have obvious social, economic and environmental benefits.

Abstract: Bacterial community structure of advanced HA-A/A-MCO sludge reduction process is analyzed by DGGE fingerprinting technology. Research results indicates that microbial flora showed the distinction of highly diversity in anaerobic tank, anoxic tank and MCO tank of the HA-A/A-MCO process, and each tank has its own diversified and stable dominant microorganisms, as so the co-activation of such preponderant bacterial community promotes the system to exert favourable and consistent function of phosphorous and nitrogen removal and sludge reduction.

Abstract: Hydrochemical working condition of nuclear power plant relates to the safety, stability and economical operation of the whole plant. In view of radioactive factors, it is very important to analyze, identify and supervise the chemical control working condition. Based on AP1000 cases, this article analyzes issues through elaborating the primary system and the secondary system of nuclear power plant, especially the hydrochemical control of steam generator, and then takes targeted and effective control methods to provide references for the future nuclear power plants.

Abstract: In diaphragm cell, by using the porous graphite as anode, ACF as the cathode, acid scarlet 3R as simulated wastewater, the experiment researched into the effect of current density, electrolyte concentration, aeration rate and the initial pH value on the color removal of wastewater. The results show that the decolourization efficiency increased gradually when the applied current density increases, but the trend will slow down when current density exceeds a certain value. The decolourization efficiency is proved to be first increases then decreases with increased electrolyte concentration and aeration rate, both excessively high and low electrolyte concentration are unfavorable to the removal of wastewater, however the aeration effect is smaller. The effect on decolorization is greater in acid condition than in alkaline condition. As the diaphragm, electrolyzer resistance increase, its average decolourization efficiency is lower than without diaphragm cell, and the decolourization efficiency of cathode area is significantly higher than the anode area.

Abstract: The experiment used iron chloride, iron dichloride and other agents as the main resources to prepare the nano Fe3O4 powder by co-precipitation method. Magnets were used to test the magnetism of the prepared nano Fe3O4 powder samples. And the photo-catalytic degradation of rhodamine B solution was used as the model reaction to test the photo-catalytic activity of the prepared nano Fe3O4 powder. The results showed that the prepared nano Fe3O4 powder samples had good magnetism but low photo-catalytic activity.

Abstract: Extended SRT (sludge retention time) is helpful to improve ability of anaerobic phosphorous release and chemical recovery of phosphate, yet phosphorous removal efficiency will not be affected. Extended SRT makes the system to have even more active sludge, it also can lead to the system have powerful ability of biochemical reaction by using superiority of concentration, meanwhile, extended SRT can still reduce sludge yield. Extended SRT can not make SMP(soluble metabolic products) accumulate in the reactor so that pollutants removal power is reduced, it also cannot affect the activity of sludge. However, extended SRT will be able to make coagulation of sludge hard, SVI value increase, yet it cannot cause sludge bulking.

Abstract: The performance of micro-aerobic hydrolysis and acidification on the treatment of refractory Chinese traditional medicine wastewater was studied. The results indicate that it is efficient pre-treatment for reducing toxicity, improving biodegradability and removing organic pollutants from dyestuff wastewater. The effluent quality was relatively stable with the fluctuant influent while the removal efficiencies of COD and SS were 28% and 81% respectively, and more importantly, the increment of BOD5/COD ratio was about 0.18.