Applied Mechanics and Materials Vols. 675-677

Abstract: In order to study combination effect of aquatic plants for the purification of eutrophic wastewater, research was carried out in greenhouse with water hyacinth (Eichhornia crassipes), hornwort (Ceratophyllum demersum L) an water milfoil (Myriophyllum verticillatum L). In the treatment of water hyacinth + water milfoil , the removal efficiency of ammonium nitrogen (NH₄⁺-N), nitrite nitrogen (NO₃^--N) , total nitrogen (TN), total phosphorus (TP) and COD was 74.7%, 61.7%, 65.6%, 73.8% and 50.8% respectively. And that of water hyacinth + hornwort was 79.0%, 52.6%, 67.5%, 46.2% and 56.9%. The combination of different aquatic plants have better removal efficiency than single species. Water milfoil showed good removal ability for the eutrophication pollutants, such as nitrogen and phosphorus, while hornwort was good at the purification of COD.

Abstract: Waste water is becoming more and more around us and phosphates exit everywhere in waste water. Eutrophication, the most common phenomenon caused by phosphate, can lead to water problems. Therefore, searching suitable materials to remove and control phosphate in waste water is of great significance. In this reach project, the method of adsorption was chosen to remove phosphate and two kinds of ceramic clay materials which were low cost and easily available as adsorbent for adsorption were used for phosphate removal. According to the removal efficiency of phosphate removal, temperature, solid to liquid ratio, the original concentration of phosphate and experiment time were studied in the experiments.

Abstract: The beet sugar wastewater is a substance produced in the sugar process, which contains deep color and high concentration of nitrogen phosphorus and potassium. Treatments of beet sugar wastewater have been one of the most important challenges for environmental protection workers. Currently, treatments which are widely used in beet sugar wastewater processing are concentration drying, anaerobic method, aerobic method and incineration. The fundamental structure, working principle as well as hydraulic model of internal circulation (IC) reactor were introduced. The application and the possibility of using IC reactor to treat beet sugar wastewater were also concluded.

Abstract: According to the fact that the layout of Liaoning ocean observation stations is not perfect, through the comprehensive research, ocean observation station is sited in Yingkou, Baishawan, and simulates hydropower and the change of tidal flat accretion-erosion in the sea area after engineering to analysis the impact of building ocean observation station on Baishawan inshore. As a result, that ocean observation station is sited in Baishawan and takes oils on land to build an artificial island, hardly change hydropower and sediment accretion-erosion variation in the waters and it has no discernible effect on adjoined sea areas and shorelines. So the building scheme of the engineering has an extremely important meaning on protecting shorelines and natural environment this sea area and carrying out management and supervision.

Abstract: To investigate the photocatalytic degradation of MG by PW₁₂-TiO₂/SiO₂, in this study PW₁₂-TiO₂/SiO₂ composite oxides were prepared by sol-gel and hydrothermal strategy. The prepared photocatalysits were characterized by XRD, BET,TEM and EDS techniques and the configuration charateristics of PW₁₂-TiO₂/SiO₂ nanoparticles were systematically investigated. Photocatalytic activity was checked by the photocatalytic oxidation of MG dye in aqueous solution. The results showed that the phosphotungstic acid still has the Keggin structure. The anatase phase of titanium oxid is identified by XRD. The result of the present work implied that compared with pure TiO₂, the PW₁₂-TiO₂/SiO₂ composite oxides have stronger catalytic activity, good particles dispersion and bigger specific surface area. The optimal concentration of MG was 20mg.L^-1, the best dosage of PW₁₂-TiO₂/SiO₂ was 1g.L^-1. Moreover, after three times of recycling, the catalyst still has high catalytic activity.

Abstract: The retardation factor (R) expression was deduced for amended double-mode sorption isotherm of perchloroethylene (PCE) in low organic carbon content (0.080~0.090%) aquifer. The retardation effect varied with the solute concentration, the higher the concentration was, the lower the retardation factor. The values of R were determined and compared with the estimation values based on octanol-water partition coefficient (K_ow), solubility data of a particular compound and Linear Free-Energy Relationships (LFER). It indicated that there were obvious discrepancy of R among the determinations and estimations. Although how to determine the exact value of R is still questioned, it may be advisable and feasible to understand the retardation effect using batch sorption tests in studying the transport of pollutant in aquifer, especially in mathematical simulation study.

Abstract: This paper studied the adsorption of organic bentonite for phenol solution by changing the condition of organic bentonite dosage, phenol concentration temperature, adsorption time. According to the experimental results The system of BP neural network was evaluated by Matlab software to forecasting the complex nonlinear relationship between the amount of phenol solution concentration, adsorption time, solution temperature and remove rate of phenol, Experimental data used for the neural network model is more than 534 times of training. After training, the model achieves an accuracy of 0.0001. Finally, a group of test is forecasted by the data model. The results showed that predictive value and measured value of absolute error is only 0.0032 and0.0016. The predicted results show that in the system, a BP neural network model is evaluated successful..This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text.

Abstract: Competitive adsorption of phenol and Cr⁶⁺ in organic bentonite was studied in this paper. To solve the problem of multivariate nonlinear model of competition adsorption for Cr⁶⁺ and phenol on organic bentonite, MATLAB was used to process data to get parameter equation. The parameter equation fitting could explain competitive adsorption behavior of phenol and Cr⁶⁺ on organic bentonite. According to the fitting equation of 3D graphics,the result was deduced that the higher concentration of Cr⁶⁺, the lower the concentration of phenol. Phenol adsorption on organic bentonite is influenced by Cr⁶⁺.

Abstract: Liaoning seas have been facing severe environmental problems. To solve the marine ecological problems effectively, the marine ecological compensational mechanism of these areas should be established and improved gradually. By reference the successful stories of ecological compensation mechanism applied in other areas and the study of the basic ideas and focal point of the ecological compensation mechanism, we finally work out the suitable ecological compensation mechanism with fluidity, complexity and universality.

Abstract: A novel bimetallic nanoFe/Cu composite supported on expanded graphite (EG) was prepared through a synthesis procedure that includes consecutive steps of an incipient wetness impregnation method, heat treatment and borohydride reduction. SEM, XRD and ICP-OES were employed to characterize the morphology, crystallinity and metal contents respectively. The SEM images show that the metal particles are spherical and arrange closely but orderly, the particle size is uniform and no larger than 100 nm. The XRD data indicate the composite consists of elementary Fe and Cu deposited on the inert EG. Batch experiments with nitrate show that the composite works efficiently for nitrate reduction in wastewater without pH control. Although nitrite as much as 40% of the degraded nitrate persisted in the reaction system, nitrite as target pollutant has been found to be easily reduced to nitrogen with a selectivity of 99.9% at pH 6 by catalytic hydrogenation. Therefore, the composite EG-Fe/Cu will play an indirect role in nitrogen selectivity. Based on the environmental friendliness and the efficiency on nitrate, both EG and the composite may be considered into the experimental teaching of environmental chemistry course.