Advanced Materials Research Vol. 977

Abstract: Considering the material property of the building,the building shows the tiny translation and rotation to the initiative period in a observation period, the paper derives minutely the formula that calculates horizontal deformation of the building by using the method of the coordinate transposition. It gives an example of calculation and draws some conclusions.

Abstract: Considering the material property of the soil body, A method erecting the deformation model of the horizontal deformation monitoring network in the landslide is discussed, it uses the partitioning method to erect the deformation model based on the topographical and the geological condition and the mathematical statistics theory. The method erecting the model can describe the deformation law of the landslides objectively. The example of calculation verifies that the method erecting the model is suitable and feasible.

Abstract: Considering the material property of the soil body to the earthquake area and the situation that the law of the deformation of surface points in regions of active seismicity will vary before and after the occurrence of an earthquake, the paper discusses the method to erect a model of vertical deformation in regions of active seismicity using spline function. Finally, it verifies the effectiveness of the method using a simulating network. Some beneficial conclusions are obtained.

Abstract: With the increasing cases of the soft foundation embankment driven by shield tunneling, study on the influence of embankment's security and stability caused by shield tunneling becomes a research focus. The calculated model considering tunnel face pressure and friction stress between shield shell and soil is established, and the influence on embankment's stability and security caused by tunnel depth, tunnel diameter, embankment slope ratio and shield additional pressure are analyzed. The results show: when shield gradually drives to the place at the ahead of slope toe to be about 7.5m, the influence on embankment's safety stability is the most unbeneficial; when the buried depth reaches 2.5 times of the diameter, the effect can be ignored.

Abstract: It is very difficult to have Land reclamation in the limestone mine.Based on the land reclamation principle and the actual economic situation of the project area geographical and geological characteristics,We are discussed land reclamation direction about of limestone areas , Improving the usage of the land reclamation type and economic value. Some reference is provided for land reclamation in other similar areas of limestone.

Abstract: Alternative conditioning of gel-like dredged sludge using Fenton reagent (H2O2/Fe2+) was examined in this study. Specific resistance to filtration (SRF) was used to evaluate sludge dewaterability.The optimization of the major operational parameters such as the dosage of H2O2 and Fe2+and the reaction temperature and time had been considered.The results demonstrate that Fenton oxidation conditioning was a practical and feasible method to the super water retention sludge. The optimum values for H2O2 , Fe2+and pH are 50 mg g-1 DS-1(dry solids), 6.25 mg g-1 DS-1 and 6, respectively, at which the SRF reduction efficiency of 76.09% can be achieved at room temperature of 5 min reaction time, which leading to big flocs or particles into smaller ones.

Abstract: Aquatic environment influences the quantity and quality of aquatic livings directly. In China, aquatic environment has been contaminated seriously as the rapid development of aquaculture industry. Bioremediation, mainly including efficient microbial agent method, immobilized microbe method, aquatic plant method, aquatic animal method and constructed wetlands method, can absorb and assimilate the organic and inorganic pollutants even toxic heavy metals in effluent, degrade them to innocuous substances through metabolism of microorganisms, aquatic plants or aquatic animals. Researches and demonstration showed that bioremediation could effectively decrease NH⁺₄-N, NO⁻_X-N, COD, SS generated by excess bait, fish manure, biological excrements and sediments, increase aquatic transparency, DO and stable pH value in aquaculture water. In future, theoretical researches should be enhanced on improvements of individual as well as integrated bioremediations which will contribute to sustainable development of aquaculture.

Abstract: A response surface methodology (RSM) was used for the determination of optimum coagulation process conditions for disperse navy blue dye wastewater treatment. The experimental design was Box-Behnken design (BBD) with three operational variables: coagulant dosage, pH value and settling time. The influence of these three independent variables on the chroma removal was evaluated using a second-order polynomial multiple regression model. Quadratic model was predicted for the response variable and the maximum model-predicted chroma removal efficiency was 95%. Based on surface and contour plots, the optimum conditions were obtained to be coagulant dosage of 70.98 mg/L, pH value of 7.46, and settling time of 15.80 min with the actual chroma removal efficiency as 93%.

Abstract: The adsorption capability of Cd²⁺ with δ-MnO₂ was studied in water. The results indicated: the adsorption strongly relied on pH values. At 303K, the pH values were above 6.05, adsorption percentages of Cd²⁺ were nearly 100%. When pH values were below 2.3, adsorption rates of Cd²⁺ was below 20%. The adsorption processes was completely controlled by reaction rate and diffusion factor. The reaction rate of adsorption increased with pH values and temperatures. The adsorption activated energy of Cd²⁺ was 54.66 KJ•mol ^-1 at pH value 3.28, and it was 31.98 KJ•mol ^-1 at pH value 6.05. δ-MnO₂ may be effectively desorpted after adsorption Cd²⁺ at the pH values below 2.05. The desorption rates were about 75%.

Abstract: The adsorption of disperse dye wastewater with organic clay by static tests is studied, Meanwhile, the composition of wastewater is analyzed by means of FT-IR,and organic clay is analyzed by means of XRD. The effect of pH , dosing quantity and concentration of wastewater on the efficiency of adsorption has been studied, and the relationship between the equilibrium concentration and adsorption capacity is concluded. In the end, the adsorption mechanism is preliminary discussed.