Advanced Materials Research Vols. 807-809

Abstract: Project environmental impact assessment theories and residential project reality closely, to study on the environmental impact assessment of deep.

Abstract: Using microwave enhanced TiO₂/AC photocatalyst to photocatalytic oxidation reactive gaudy red dye wastewater.Inspected the influence of the microwave irradiation time and microwave power on the preparation process, and comparative study the influencing treatment effect factors like the initial concentration of wastewater, photocatalyst using times and photocatalyst dosage.The results showed that:the irradiation time is 1min on 520W ,the photocatalyst activity is the highest . The initial concentration of wastewater is 50mg/L, 10.0g/L of dosage, the best decolorization rate is 95.6%, Compared to the no enhanced, the improvement for photocatalyst increased by 8.7%., indicating that the microwave enhanced TiO₂/AC photocatalyst can effectively improve the treatment effect of dye wastewater.

Abstract: The Ag/AgI/Bi₂WO₆ photocatalysts were successfully synthesized by deposition-precipitation and photoreduction methods. The catalyst showed high and stable photocatalytic activity for the degradation of the RhB under visible light irradiation (λ>400 nm). On the basis of a new plasmonic photocatalytic mechanism, the photogenerated electron-hole pairs are formed in Ag nanoparticles (NPs) due to surface plasmon resonance under visible-light irradiation. Then, the photoexcited electrons at the Ag NPs are injected into AgI. On the other hand, the band position shows that AgI and Bi₂WO₆ have the matching band potentials in the AgI/Bi₂WO₆ heterostructure composites. So the photoexcited electrons is ultimately transfer to the Bi₂WO₆ conduction band (CB), photo-induced holes (h_VB⁺) is transfer to the AgI valence band (VB) and the simultaneous transfer to compensative electrons from I^- to the Ag NP_S. This the result indicates that the high photosensitivity of noble metal Ag NPs due to surface plasmon resonance, which is not only improve the photocatalytic performance, but also offer a new idea for preparation of new photocatalysts .

Abstract: The removal of phenol from aqueous solution was evaluated by using microwave technique assisted with active carbon. The effective factors such as the concentration of phenol , active carbon dosage, microwave power and irradiation time on the removal rate were investigated. When the concentration of phenol was 150 mg/l, active carbon dosage was 6 g/l, microwave power was 500 W, and irradiation time was 8 min, the removal ratio of phenol reached 95. 03%. The research on kinetics suggested that the process of treatment accords to the first-order reaction.

Abstract: Described the dangers of greenhouse gas carbon dioxide and the significance of CO₂ capture. Discussed the principle of the traditional and new technologies for CO₂ removal and find some problems with them.

Abstract: The Reynolds stress model (RSM) provided by FLUENT software was applied to study flow field of a cyclone separator used in some circulating fluidized bed. The pressure distribution and velocity distribution was analyzed. The simulation results reveal the strong swirling flow and vortex structure in cyclone separator.

Abstract: TiO₂/α-Al₂O₃ is prepared by liquid-phase deposition method from titanium ammonium fluoride. The morphography and crystal form of supported catalyst are analyzed by XRD and SEM. The results show that anatase is detected when the calcination temperature is 800°C, the interaction of TiO₂ and support inhibit TiO₂ transfer into anatase. The addition of polyvinyl alcohol makes the active component evenly distributed. It is found that when support for catalyst is honeycomb column α-Al₂O₃, loading amount is 4.0%, and calcination temperature is 800°C, the CODcr removal rate could reach 66%. Furthermore, no obvious evidence of deactivation and intensity for the catalyst could be seen after running for 100 hours.

Abstract: This study examined the effect of oxalic acid on phytoremediation of Cr contaminated soil in Cr-hyperaccumulator Leersia hexandra Swartz (L. hexandra). The effects of 0, 40, 80, 120 mmol kg^-1 oxalic acid (OA) on biomass, Cr accumulation and translocation of L. hexandra and four kinds of enzymes in 200,400 mg L^-1 Cr contaminated soil planted L. hexandra were studied. The results showed that above-ground biomass was maximumly increased by 48.25% under OA treatment and OA also enhanced the plants ability to translocate Cr from roots to the harvestable aerial part which could contribute to phytoremediation. OA applied to soil planted L. hexandra with Cr stress maximumly increased dehydrogenase, sucrese, urease, peroxidase activities by 82.51%, 125.22%, 56.25%, 64.57% (p < 0.01). These results suggest that OA is an important amendment which can enhance the remediation capability and soil activity of Cr contaminated soil in L. hexandra.

Abstract: Partial nitrification (PN) was rapidly started-up in a sequencing batch membrane bioreactor (MBR) treating domestic wastewater with low temperature (11~15°C), the influence of alkalinity on PN process and the feasibility to control the ratio of nitrite to ammonia in effluent were investigated through changing the ratio of Alkalinity/ammonia in influent. Results showed that effluent ratio can be controlled flexibly with the liner relationship between ammonia conversion and the ratio of alkalinity to ammonia when alkalinity is insufficient, whereas, that could be effectively achieved by the indicator role of alkalinity on nitrite. Phylogenetic results indicated the predominance of Nitrosomonas and the absence of the Nitrosospira in the condition of insufficient alkalinity, which was consistent with the SEM results. FISH results suggested that lack of alkalinity presented little impact on the relative quantity of AOB.

Abstract: Pollution point source identification for the non-shore emission which is the main form of sudden water pollution incident is considered in this paper. Firstly, the source traceability of sudden water pollution accidents is taken as the Bayesian estimation problem; secondly, the posterior probability distribution of the source's parameters are deduced; thirdly, the marginal posterior probability density is obtained by using a new traceability method; finally, this proposed method is compared with Bayesian-MCMC by numerical experiments. The conclusions are as following: the new traceability method can reduce the iterations, improve the recognition accuracy, and reduce the overall average error obviously and it is more stable and robust than Bayesian-MCMC and can identify sudden water pollution accidents source effectively. Therefore, it provides a new idea and method to solve the difficulty of traceability problems in sudden water pollution accidents.