Advanced Materials Research Vols. 884-885

Abstract: Bench and pilot scale pre-oxidation treatment runs were performed on the raw water samples from micro-polluted reservoir. Bench experimental results showed that the particles with large size decreased when ozone pre-oxidation was applied, meanwhile, the organic matters with unsaturated chemical bonds decreased obviously. Pilot experimental results showed that turbidity, UV₂₅₄,COD_Mn and total coliform could be treated efficiently by ozone pre-oxidation combined with traditional technologies, but the effectiveness of DOC removal is not obvious. Keywords: ozone oxidation; UV₂₅₄; Organic matter; micro-polluted water

Abstract: In order to reduce the energy consumption for the separation of methyl propionate-methanol-water system, the application of salting-out extraction was studied. The main functional mechanism of salting-out extraction was that the salt ions form complex with the methanol molecules and intermolecular hydrogen bonds were formed between the moleculed of inorganic salts and water. The results of gas chromatography showed that adding salts can significantly decrease the mutual solubility of the components in the system mentioned above. The results showed that the optimum operation parameters were as follows: the saturated MgCl₂ was selected as the best solvent, solvent ratio (VF/VS) was 1：2.5, extraction temperature was 20 °C, stirring rate was 300r/min, stirring time was 20min, and settling time was 20min. Under the optimized parameters, the mass fraction of methyl propionate exceeded 99.33% and the yield was 90.19% through the three-stage of cross-current extraction.

Abstract: The technologies of ion exchange resin for ultra pure hydrogen peroxide production are more and more focused.The aim of this research was to select suitable parmeters for effective removal of P ion impurities from the experimetal aqueous hydrogen peroxide solution to produce ultra-pure hydrogen peroxide. Dynamic experiments for the different operation conditions, i.e., initial concentrations, flow rates, ratios of height to diameter were carried out. The concentrations of P anion of the effluent samples from the anion exchange resin column were determined by ICPS-7510.The breakthrough curves of P ion were measured and analyzed. The results showed that P ion could be reduced effectively from the experimetal aqueous hydrogen peroxide solution with the fitting conditions of ion exchange resin column, It provided the basis for determining of the suitable operating conditions of ion exchange column of commercial plant.

Abstract: Study on influencing factors of rapid identification of drainage oil by conductivity method through experimental, discuss the influence of different operating conditions on the determination results. The effects of oil/water ratio, oscillation time, temperature, and oil type on conductivity were explored. Measured water conductivity of different kinds of oil, analysed the change of the conductivity and the best operating conditions were elected. The results showed that under the condition of normal temperature, shocked the mixture for 30s, the oil/water ratio was 4:1 and subsided for 15 minutes,the conductivity of drainage oil,frying oil and edible oil were 72.7 us/cm34.3us/cm12.5us/cm. The conductivity was largest and the testing results was most sensitive.

Abstract: In this study, thermogravimetric analysis coupled with Fourier transform infrared analysis (TG-FTIR) was used to studying the volatile evolution characteristic during the eucalyptus pyrolysis from South China. The thermogravimetric analysis results indicate that the pyrolysis of eucalyptus occurred in three main stages which are the moisture vaporization stage, the volatile matter release stage and the char decomposition stage. The major gases evolved during the pyrolysis process were identified to be H₂O, CO, CO₂, CH₄. In addition, the effects of different heating rates on the emissions of these pyrolysis products have been studied.

Abstract: The cyclotrimethylene trinitramine(RDX) added into gun-propellants can improve the energy of the gun-propellants, but influence their mechanical properties. Under the suitable experimental conditions by using the compression test and drop hammer test, the influence to mechanical properties of gun-propellants by RDX content is obtained. The results indicate that with the increase of RDX, the compressive strength of gun-propellants increases, but impact strength decreases. While, the compressive strength of gun-propellants decreases, but impact strength increase when the temperature rises.

Abstract: Straw resource was tremendous, however it was utilized poorly. So the research of physical, chemical and mechanical pulping properties of cotton stalk fiber laid the foundation for utilization of cotton stalk. Morphology of cotton stalk fiber was determined by Feica microscope, the length, width and length to wide ratio were analyzed by SPSS 17.0. Chemical composition changes of cotton stalk fiber after mechanical process were analyzed by applying Block test method with Design-expert 6.0.10.The result present that composition of fiber had significant difference. Hemicellulose decreased by 1.68 %, cellulose decreased by8.85 %, lignin increased by 5.87 %. Beating degree was positively correlated with the pulping time, beating time and wet weight were a negative correlation. Strength of cotton stalk fiber was positively with the gramme, and strength was 8.5 N when gramme was 60 g/m2.

Abstract: The DOW’s Fire and Explosion Index (F&EI) was used to assess the chemical enterprise production safety risk. This article used methanol synthesis unit as an example, according to the characteristic of the hazardous chemical and process of the fertilizer production, conducted risk evaluation of the production unit by Fire and Explosion danger index evaluation method, and proposed suitable safety protection measures aim at the evaluation results.

Abstract: Basing on coal and the oxygen evolving complex theory, the method of study on the spontaneous combustion by analysis the microporous in coal has been established in this article. By the electron microscope, the process of microporous volume changeing with the temperature gradually increased is observed. It is believe that the process of spontaneous combustion reaction should be carried out in the microporous. Finally, under the help with finite element analysis , the temperature field surrounding microporous has been analyzed and the distribution regularity of the temperature field has been obtain. It make the conclusion that coal surface microporous can be used as evidence of coal spontaneous combustion reaction.

Abstract: Decentralized wastewater reclamation and reuse project as a useful complement of Centralized sewage treatment and reuse is a good way to solve water shortages and water environment pollution in urban and surrounding areas. Then the investors tend to focus on the projects financial economic effectiveness when making decisions, hindered the development of decentralized wastewater reclamation and reuse project. To promote decentralized wastewater reclamation and reuse projects rapid growth, proposed decentralized wastewater reclamation and reuse Evaluation System and Model based on environment accounting perspective. Through analyze a project by using fuzzy comprehensive evaluation model in university in Xi'an. The result shows that this project not only has a good economic benefit, but also they can improve the environment and promote sustainable development of society.