Advanced Materials Research Vols. 864-867

Abstract: As the economy grows rapidly, Inner Mongolia is faced with more and more serious environmental problems, which cast a large shadow on the ecological system, health and economic development. Environmental problems have become the biggest restricting factor for economic growth and the sustainable development of society in Inner Mongolia. This paper uses three wastes emissions as a research object and adopts the method of grey relational analysis, and selects the indexes of economic development level, science and technology input and policy level, energy consumption level, then performs grey relational analysis for waste water, waste gas and waste solid. The research results show that economic development has the greatest influence on the emissions of industrial waste water and waste solid; coal consumption has the biggest effect on the emissions of industrial waste gas, meanwhile coal consumption also has a big impact on the emissions of waste water and waste solid.

Abstract: Preferential flowpaths (PFP) causes highly heterogeneity of soil. In this study a preferential flowpaths generalized model has been established, based on dual-domain model (DDM) which reflects contaminant transport and the dynamic transfer between mobile and immobile domains, quantitatively analyses the contaminant mass transfer in pore scale at three different conditions. Besides, define relative hydraulic conductivity reflect the impact of PFP physical parameters, results show that it can affect the contaminant transport form and the distribution of contaminant concentration.

Abstract: On-road particle emissions were tested in urban areas of Shanghai from a diesel bus equipping diesel particulate filter with fuel burner. EEPS 3090 particle analyzer was used for analyzing concentrations of particles in different diameters. In this paper, characterization of particles in soot loading and regeneration processes were identified, and particle reduction ability of DPF bus was analyzed. Result shows that, the averaged particle emission rate from DPF bus was degraded by 1 to 2 orders of magnitude during soot loading. Particle concentration distribution was transformed from nuclei-accumulated bi-modal pattern to uniformly multi-peaks patterns. In DPF regeneration process, particles of accumulated mode sized between 60.4nm and 107.5nm were decomposed and oxidized into fine nuclei particles of 29.4nm to 60.4nm, which increases total particle concentration. Reduction percentage of particle number per kilometer of DPF bus for soot loading and regeneration process reaches respectively 97% and 83.2% compared with normal diesel bus.

Abstract: This work mainly described adsorption of Pb(Ⅱ) and Cd(Ⅱ) using a new chelating fiber with iminodiacetic(IDA). The chelating fiber was characterized by FT-IR and SEM, and the factors such as pH, change of time, and concentration of the initial solution on the adsorption process were discussed.

Abstract: To study the PM10 collection in a wire-plate ESP, a numerical model was built and performed by FLUENT software. Deutsch-Anderson Equation was subsequently applied to collection efficiency calculation. The numerical results under different gas velocities at inlet and particle distributions indicate that the collection efficiency of PM10 increases with a decrease in gas velocity, and that the increment of grade efficiency will become bigger if particle diameter gets smaller. By comparing with a decrease in gas velocity, diffusion charging mechanism is found to be valuable for PM10 in aspect of collection. As two parameters of Rosin-Rammler distribution decrease, grade efficiency will increase, especially for fine particles, and a larger positive effect the diffusion charging mechanism will have on collection efficiency, but overall efficiency will decrease. Finally, the effect of particle distributions on grade efficiency is much smaller than that of diffusion charging mechanism or the gas velocity at inlet.

Abstract: The sewage diffusion is an environmental material for protecting marine environment. It plays an important role in port engineering. Its effect under deep water was carried out between different diffuser design parameters based on the hydraulic model test, and Cao Fei-dian SCIP sewage marine disposal project was taken as an example. For this project, jet angle was controlled to be 0 degree, and horizontal angle was controlled to be 0 degree. It not only can ensure that sewage fully diluted mixed, also can avoid the premature convergence and sewage lifting. It is feasible for selecting large angle nozzle under deep water and there are some technical bases have been provided for other sewage marine disposal project.

Abstract: The catalysts of Mn/TiO₂, Fe/TiO₂ and Mn-Fe/TiO₂ prepared by coprecipitation method were investigated for low temperature selective catalytic reduction of NO with NH₃. The catalytic activity and SO₂ resistance of these three catalysts were tested and the properties of the catalysts were characterized by using N₂-BET, XRD, H₂-TPR, NH₃-TPD methods. It was found that the doping of iron reduced the catalytic activity of Mn/TiO₂ catalyst at low temperature and also has an adverse effect for its SO₂ resistance at the same time. The decrease of surface area , redox ability and surface acid sites caused by doping of iron might be the main reasons for poor performance of this catalyst.

Abstract: Emission control of methane from landfills has received considerable attentions in recent years. Photo-electro-catalytic oxidation of methane was carried out at the mode of continuous electrolysis and intermittent illumination with TiO₂-coated titanium mesh plate as pholocatalyst and electrode in combination with ionic liquid as electrolyte under UV light irradiation. The result showed that the rapid conversion of methane was achieved under ambient pressure and temperature through photocatalytic oxidation combining with electrolysis. Under the mode of intermittent illumination (on:off = 10 min : 10 min) and continuous electrolysis (II-CE), the highest oxidation rate of methane (280 mg/(m³min)) was obtained. Under fixed off time and total illumination time, the oxidation quantity of methane linearly increased with the intermittent frequency. Photo-electro-catalytic oxidation of methane can be described by the first-order kinetics, and the apparent kinetic constant increased with the intermittent frequency.

Abstract: Based on three-dimensional hydrodynamic model, moving boundary technique and embedded pollutant transport model, the concentration field of the soluble and conservative liquid chemicals spilled into the tidal river was calculated and the chemicals movement around a jetty at DA Liaohe was simulated. By analyzing the simulation results, the chemicals motion law with tide and their concentration field on and in water were deduced.

Abstract: A manipulative indoor experiment was conducted to study the removal effect on total phosphorus (TP) by three hydrophyte plant species, Iris sanguinea, Acorus calamus, and Iris pseudacorus. The nutrient solution consisted two levels of phosphorus (P) treatment [low (1 mg L-1 P) and high (4 mg L-1)]. The experiment results show that all three plant species had an active effect on the phosphorous removal, and abilities of remove phosphorous vary among different macrophyte species. After 28days growing in the water, the removal rates on TP, at the low level (T1) treatment, were 88.6%, 87.66% and 91.68% by Iris sanguinea, Acorus calamus, and Iris pseudacorus, while 86.77%, 53.51% and 94.42% at the high level treatment (T2). Speed of the pollutants decreasing become slower over time, and removal effects of TP was more obvious during the first 3 weeks. Keywords: hydrophytes, TP, removal efficient, eutrophical