Advanced Materials Research Vols. 807-809

Abstract: The study aims at investigating the performance of nanoTiO₂ photocatalytic oxidation technology for the pretreatment of restaurant wastewater. The rate of lipids removal depends on conditions, such as irradiation time, TiO₂ dosage, aeration and addition of Fe³⁺ or H₂O₂.The optimal conditions are determined: proper time of irradiation 10 min, TiO₂ dosage 25mg/L,pH6.0, adding 5mL Fe³⁺. Under this optimum, the removal efficiency of lipids reaches 74.7 ~ 88.6%, and that of CODcr was around 45.2~76.2%.While using illumination for 10 min, companied with TiO₂ and Fe³⁺/H₂O₂, the removal efficiency of Grease could increase by 3%~15%.Thus, satisfactory results were achieved for pretreatment of Grease Wastewater from restaurant, and this technique could be used as a pretreatment step for next biological treatment of restaurant wastewater.

Abstract: Previous study using batch method showed that an integrated technique using a combination of zero-valent iron and an anaerobic microbial community (FeMB) showed good degradation efficiency for perchloroethylene (PCE). In this study, a permeable reaction barrier (PRB) with FeMB as reactive media was simulated in remediation columns. It was proved that PCE was retardation adsorption and degraded in remediation columns. A mathematical model was developed and used to simulate the transport and transformation of PCE in remediation columns, and was also used to predict the fate of PCE in groundwater in different conditions. Results showed that FeMB PRB might be an environmentally desirable technology and the model could describe successfully the transport and transformation of PCE in remediation columns.

Abstract: The results of optimization of catalysts for gases clearing from sulfur dioxide using processes of oxidation are presented in this work. The researches carried out with the help of modern methods: kinetic, IR-, UV-spectrophotometric, viscometry, LG-chromatography, redox-potentiometric. It is shown, that developed complexes of transitive metals immobilized on a polymeric matrix are highly effective and stable catalysts for the sulphur dioxide oxidation processes. By the example of cobalt compounds the reactions kinetic investigated in details, the kinetic equation is received, allowing to optimize process of gases clearing from sulfur dioxide, kinetic and thermodynamic parameters of process are calculated.

Abstract: Based on the field observations and laboratory analysis data of the suspended sediment of Wendeng coastal area, this paper studied the change process of suspended sediment concentration and characteristics of surface sediment resuspension in the study area. In results: (1) In vertical, the suspended sediment concentration of each station increased gradually from surface to bottom, and the maximum value could reach 0.11 kg/m³; (2) Suspended sediment concentration is well correlated with velocity variation in a tidal cycle, and the peak of suspended sediment concentration occurs four times in a tidal cycle, indicating that there are four resuspension processes during a tidal cycle in the study area; (3) According to the suspended sediment concentration at different times and the content of the previous time, the maximum settlement is between 0.063~0.092kg/m³, and the maximum resuspension is between 0.057~0.125kg/m³ in the study area.

Abstract: Water Resource Carrying Capacity related to Economic Sustainable Development of an area. To improve the utilization efficiency of water resources in Gansu.Carrying Capacity of the Water Resource provides a useful measure of the sustainable development of a region. The results showed that most parts of Gansu Province overloading of water resources. And the situation of Water Resources Carrying is far from adequate.And the utilization degree of water resources in Gansu is at the highest level and the exploitation potential is small.

Abstract: The study used MIKE21 to establish a two-dimensional mathematical model of Changjiang Estuary, doing a numerical simulation about the changes of the velocity along the South and North Passage and the flow spilt ratio of them with different ranges of sea level rise. The results show, with sea level rise, in the North Passage, the rise and fall velocity will increase from beginning to middle, and will reduce at outside, and the flood flow will enhance, the ebb flow will weaken, so it will result in fall deposition here; in the South Passage, the rise and fall velocity will increase at beginning, the rise velocity will reduce and the fall velocity will increase from middle to outside, and the flood flow will weaken, the ebb flow will enhance, so the river will be scoured, it will be conducive to the rivers development here.

Abstract: A two-dimensional numerical model was set up to simulate the tidal current of the Yangtze River Estuary with MIKE21 FM. This model has been calibrated and validated with the observed tidal level. We simulated the change of flood and tidal stage in the Yangtze River Estuary after the sea level rising by 20~60cm. The simulate results indicate that: (1)With sea level rising, the extent of rise of the high tide is greater than that of rise of low tide. Under the same sea level rise, the closer to the lower reaches of the Yangtze River Estuary, the more obvious the increase in the low tide level is, the rise of the high tide does not change significantly. (2)For the changes of the tidal range increase, under the same sea level rise, the closer to the upper reaches of the Yangtze Estuary, the greater the tidal range increase is.

Abstract: In view of the influence of a certain amount of the sediment in agricultural irrigation water and low temperature to water meter accuracy, experiment of performance and abrasion under the different sediment rate and experiment of the freezing heaving in the different temperature to water meter were developed, the results show, the error rate of water meter is different under different sediment rate, and the error rate become bigger after abrasion 500h under the different sediment rate, and the reading of numerous water meter become smaller. Under the condition of low temperature, the water meter is easy to happen the frost heaving damage phenomenon when the water meter chamber filled with water, and the water meter is generally not heave when water meter chamber not filled with water. The change of water meter accuracy is little after low temperature frost heave.

Abstract: Es2 8th sand group in Shengtuo oilfield is a typical braided river delta front deposition. Through depositional physical simulation, the development mode of mouth bar and its main controlling factors were summarized. Physical model and experiment scheme were set up according to similarity criterion and the depositional background in research area. One provenance and three times simulation was designed to simulate three single layers within Es2 8th sand group respectively. Development mode of mouth bar was summarized with three single mouth bars based on swing conditions of rivel estuary and two composite mouth bars according to whether they are developed at the same time.

Abstract: The change of water split ratio has important impacts on the fluvial process, saltwater intrusion and navigation in estuary area. A 2D hydrodynamics numerical model of the Changjiang Estuary was set up using Delft3D-FLOW. The calculation results are consistent well with the real measured data, which indicates that the model can be used in hydrodynamic analysis. Simulation results show that the ebb water split ratio of the North Branch in the flood season is larger than that in the dry season, while the situation of the South Branch is opposite. Under the condition of different tidal types, the ebb water split ratio for the North Branch is maximum during the spring tide, and minimum during the neap tide, while the one during the middle tide takes the second place.