Advanced Materials Research Vols. 255-260

Abstract: Blooms of the Microcystis aeruginosa in water have been a long-standing problem for water quality and a human-health issue. Public concern for the inhibition of Microcystis aeruginosa has become increasingly urgent. AgBiO₃ is an algaecide having good inhibitory effects on the growth of Microcystis aeruginosa with hydroxyl radicals generated by photocatalyst. The inhibition of Microcystis aeruginosa exposed to AgBiO₃ was optimised using statistically-based experimental designs. The four variables, namely, ZnSO₄, CaCl₂, CuSO₄ and NaNO₃, were screened as significant effects and were further optimised to determine the optimum levels and their interactions. The optimal concentrations of variables for maximum inhibition were 0.24 mg/L ZnSO₄, 125.94 mg/L CaCl₂, 0.28 mg/L CuSO₄ and 600 mg/L NaNO₃. The maximum inhibition rate predicted by the model was 61.86%, in near-perfect agreement with the experimental value (60.07%), and significantly better than unoptimised medium (42.79%).

Abstract: The CDM-AR project is a market-oriented approach to absorb carbon dioxide through afforestation and reforestation according to the Kyoto Protocol. This paper analysised the status of the CDM-AR projects in China, and asked why there are so few CDM-AR projects in China even in the world The reasons include: Financial constraints, Constraints associated with knowledge, skills and other social factors. The particular reasons for China include: the specific terrains and soil fertility in China, the ownership of the forest land and so on. The CDM-AR project which can offer many economic, social and environmental benefits, is at the initial stage. It has great potential. The potentials of the CDM-AR project include: introduction of foreign capital and advanced technology from developed countries; establish of the forest ecological compensation mechanism in China; lower cost than the cutting emission ways at home for the developed countries.

Abstract: Brucellosis is a disease which is caused by Brucella .The virus can make human and livestock sick. Its transmission of wide range is easy to occur and it is large harm to human and livestock. In this paper, based on fluorescence polarization immunoassay method, a experimental system is designed. The system consists of optical, circuit components. In order to improve the sensitivity of the system, Photomultiplier tube is used as detector. A number of experiments carried out. The result shows that the design is flexible, stable which can be used widely.

Abstract: The GC-ECD was used in this study. The optimization of preparation was performed by U9(94)uniform design method, With the rate of 2,6-DNT -degrading result as investigative indexes, the influences of ratio the concentration of substrate and PH, The speed of shaker and Temperature .the result were screened by Uniform Design to found the optimum condition of degrading . Result the optimum condition for 2, 6-DNT -degrading as following: The concentration of substrate is 135mg/L, pH=7.3, Temperature is 29°C, speed of shaker is 129 rpm/min. The result show: It is scientific and feasible to screen the experimental condition of for 2，6-DNT - degrading by using the uniform design and regression.

Abstract: The electrochemical oxidation of wastewater from DDNP production was investigated using a boron-doped diamond (BDD) thin film electrode. The effects of operating factors such as cell voltage, interelectrode distance and additive NaCl have been studied. This study showed that the chemical oxygen demand (COD) reduction is most influenced by the applied cell voltage. Higher current densities resulting from higher cell voltages increase the formation of oxidative reagents resulting in an increased COD removal rate. The maximum COD removal was 57% after 210 min, with an energy consumption of 14.90 KWh·kg^-1 COD when cell voltage was 12V, interelectrode distance was 3cm and additive NaCl concentration was 1g·L-1. The use of BDD thin film electrode for the treatment of DDNP production wastewater appears commercially feasible.

Abstract: Volterra series kernel coefficient calculation of non-linear system is a difficult problem. In this paper, we introduce some way, which can get kernel coefficient. With the increasing of memory length and identification order, it can make calculation complex and hard to rebuild system non-linear model. This article introduces some conventional Volterra series kernel calculation ways, and introduces a kind of method to get Volterra series kernel through using Hilbert space method emphasis, this method can transform Volterra series kernel coefficient calculation problem into reproducing kernel coefficient problem, which has largely simple calculation rate and can get any order Volterra series kernel coefficient in theory.

Abstract: Density-functional theory (DFT) theory is conducted for the structural and electronic features at the Hg/Al₂O₃ interface by the analysis of optimal structural geometry, partial density of states (PDOS) and difference charge density. The two adsorption sites of on-top and hollow locations according to the symmetry is adopted to construct the associated interfacial models between Hg atom and free surface. The calculated studies show that the oxygen atoms near Hg atom in the Al₂O₃ surface, for both on-top and hollow sites, have the gathering effect by shifting toward Hg atom. But their interacting electrons at the interface exhibit different statues in terms of the PDOS analysis that there have no evolution tendency to form the bond between associated O and Hg atoms at the on-top site; and the occurrence of Hg-5d and O-2p overlapping orbitals reveals the strong covalent bond existed at the interface. The PDOS curves show that Al atom in the surface is not liable to contribute to the formation of corresponding bonds by mixing its electrons with Hg atom. Meanwhile, the calculated results derived from difference charge density are in good agreement with the PDOS analysis. The calculated results support some advanced atomic investigation on design a new sorbent refined from fly gas, especially improving the mercury removal from the flue gas.

Abstract: Set 5 sample sections in a certain gully area in the tributary of Iton River from upstream to downstream of Changchun city, which locates in the northern part of China, then respectively collect sediments and soils which are proximal and distal away from the river bank, test the heavy metal content of Zn, Cu, Cd, Pb and conduct pollution assessment. The result shows that: the content of Zn in sediment is in the state of light pollution, Cu has an obvious accumulated tendency, Pb，Cd are basically in a state of local background value. Therefore, the pollution index of sediment is in a state of slightly pollution, the proximal bank-side is in the safe state, while the distal bank-side is in a state of alert. The main reasons that cause heavy metals pollution and accumulation are traffic and agricultural pollutions.

Abstract: Three kinds of granular carbon made from different materials of coal, coconut shell and jujube seed were evaluated for adsorption of 2-methylisoborneol in drinking water by equilibrium isotherm simulation. Results showed that Freundlich isotherm can more suitable to describe the adsorption of these three kinds of carbon. For coal-based, coconut shell and jujube seed carbon, the largest adsorption capacity of 2-MIB were 2225.0，3152.8 and 1E-07（ng/g）(L/ng)ⁿ respectively in pure water, and in raw water they were 559.6，612.5 and 6E-28（ng/g）(L/ng)ⁿ respectively, about one-fifth of those in pure water. Among the selected carbons, coconut shell carbon had the largest adsorption capacity, followed by coal-based and jujube seed carbon which can hardly absorb 2-MIB.

Abstract: Metabolites of alga that will induce disgusting odor into drinking water such as geosmin, 2-methylisoborneol and dimethyl trisulfide, etc. attracted more and more scholar’s attention recently. Dimethyl trisulfide was newly noticed to be criminal of some water supply accidents of unpleasant odor in our country and was found removed effectively by oxidation agents. Batch tests were carried out in this research to investigate reaction kinetics of dimethyl trisulfide oxidized by potassium ferrate in water. Results showed that dimethyl trisulfide can be removed by potassium ferrate and the rate of decomposition followed third-order kinetics, the third-order reaction rate constant k= 6.57×10L/ (s·mg).