Advanced Materials Research Vols. 1092-1093

Abstract: An injection method was proposed for the preparation of R134a in N₂ gas standards at 10 nmol/mol. The standard gravimetric method of ISO6142 was used as verification for the injection method. Results showed that good consistence between the injection method and the standard gravimetric method could be obtained. The contribution of the injection method to the standard uncertainty was about 0.92%, almost in the same order of magnitude with contribution of the standard gravimetic method.

Abstract: In recent years, radionuclide monitoring and contamination control have been attached great importance. Wide attention has been paid to the measurement and analysis of Neptunium (²³⁷Np) as one of the radio-nuclides. With the development of mass-spectrometry technique, the inductively coupled plasma-mass spectrometry (ICP-MS) technique, with its outstanding advantage, has been widely applied to the measurement of ²³⁷Np in environmental and biological samples. In this paper, the progress in analysis of ²³⁷Np in environmental samples with ICP-MS technique is overviewed.

Abstract: The analysis index of the portable metal analyzer for trace heavy metals in natural water based on anodic stripping voltammetry (ASV) were performed. Simultaneous determination and monovariated analysis of trace heavy metals were investigated both subsequently. The reasons of disturbance in analysis were also discussed. The addition of Ga (II) was testified that can eliminate the formation of the Cu-Zn intermetallic compound.

Abstract: The objective of this article is to apply an ecological indicator screening method, which is the Comprehensive Method for Water Ecological Index Screening (CMWEIS). CMWEIS is based on the Principal Component Analysis (PCA) and the Delphi Method (DM, a kind of expert investigation method). Not only the objective factors but also the subjective factors are considered. Using CMWEIS, the ecological indicators were sorted in the range of Liao River basin. 25 ecological indexes, 2 years’ observed data of the main stream of Liao River were considered. Ten specialists were invited to answer the designed questionnaires. After 5 times of screening, the score of each ecological index was provided and 11 indexes were selected. CMWEIS considered both the objective characters of the indicators and the subjective adjustment of the specialists. So the indexes selected by WEIDSM could reflect the ecological status well and truly. The model was programmed and all the statistical calculations were done by the computer. It could be expected that WEIDSM could give the sequence of ecological indicators quickly, so as to make ecological monitoring or evaluating more effectively.

Abstract: With the large-scale usage of coal and gasoline, China has been the most serious SO₂-polluted country in the world. SO₂ can cause respiratory and cardiovascular disease, which does great harm to human health. Therefore, developing an air purifier to absorb trace SO₂ is very necessary. According to the mechanism of SO₂ absorption with the alkaline solution, we developed an air purifier with an purification capacity of 80m³ -100m³ per hour. The purification effect with different gas flow rates, absorbing liquids and initial SO₂ concentration was tested. Test results indicated that the purifier had a very good absorption of trace SO₂ for indoor air. A SO₂ purification model in confined space was established and the purification effect of the purifier was simulated with ANSYS FLUENT 14.0.

Abstract: In this paper, flue gas denitration technology in the application of small and medium sized coal-fired industrial boilers are analyzed and discussed. To 65t/h CFB(Circulating Fluidized Bed) industrial boiler, study small and medium sized coal-fired industrial boilers flue gas SNCR denitration technology solutions, and analyzes economic and environmental benefits for small and medium sized coal-fired industrial boilers flue gas SNCR denitration technology.

Abstract: Food waste management has become an important issue from the environmental, economic, and social points of view due to the fast increase of food waste production and serious environmental pollution. Food waste is considered to be an attractive feedstock of anaerobic digestion and has attracted worldwide attention because of its good biodegradability and high methane production potential. However, in practice, anaerobic digestion system of food waste often shows poor performance and stability, which greatly limited the development of anaerobic digestion process of food waste. In order to obtain high treatment efficiency and satisfactory methane yield, many researchers employed various control strategies for anaerobic digestion of food waste including pretreatment, additive agent addition, two-phase anaerobic digestion, and anaerobic co-digestion. Therefore, this article is intended to review the control strategies for anaerobic digestion process that have been developed for methane production from food waste.

Abstract: The research group Combined with purple cloud point extraction method and UV spectroscopy technology .The best extraction conditions of Cu-Glycine is: 230nm, pH value of 9.0, NaCl solution 4.0mL, Triton X-100 solution 50.0 mg/ml,1.0mL. This method is applied to environmental water samples in the separation of trace amounts of copper and measured.

Abstract: The total sulfur rate of the coal sample was 4.973%, the inorganic sulfur content was more than 60%, which was the main component in the coal sample. The effect of grinding fineness, flotation pulp density, collector and frother on coal flotation desulfurization were investigated in this paper to remove the inorganic sulfur. The results showed that it reached to the optimum desulfurization rate 54.7% when the optimum grinding fineness was 39.20% -200 mesh rate, pulp concentration was 80 g/L, kerosene consumption was 1.4 kg/t, 2^# oil loading was 100 g/t, and the total sulfur content reduced to 2.72%. The optimized flotation condition determined by orthogonal experiments was as follow: pulp density for 60 g/L, kerosene dosage of 1.4 kg/t, 2^# oil consumption of 100 g/t. In this case, total sulfur content reduced to 2.19%, the total desulfurization rate and the inorganic desulfurization rate were 55.96% and 92.89%, respectively.

Abstract: The oxygenated feed-water treatment technology of supercritical unit can effectively decrease the corrosion of water-steam system, and thus steam-water quality and operating efficiency are greatly promoted. In view of modes of feed-water treatment technology for supercritical unit, the characteristics of oxide film in thermal system under AVT and OT conditions are compared; and then, the principle of oxygenated feed-water treatment technology was elaborated. Besides, the oxygenated conditions, controlling of water quality, advantages, the relation between formation of oxide scale and oxygen plus are analyzed. Finally, the paper introduced weak oxiding feed-water treatment technology, with the principle of low oxygen and high pH value.