Applied Mechanics and Materials Vols. 522-524

Abstract: To study the ocean environmental problem, the article analyses and predicts the hydrodynamic feature of study area on the basis of Ecom model. After simulation of the contributed concentration field, the paper assesses the influence of the cyanide in discharge of sewage on the marine water quality nearby. Research shows that the results reflected the rules of transportation and diffusion of pollutants in the tidal water area bitterly.

Abstract: The article analyzed the adsorptive ability of acorus calamus to Pb,Cd in soil through pot experiment. The results show that with the increase of concentration of this two kinds of heavy metals,the growth of acorus calamus have been obviously affected.The concentration of two kinds of heavy metals in the acorus calamus root is far more than in the cauline leaf,which show that acorus calamus have very strong retention effect on these five kinds of heavy metals. As acorus calamus absorb the Pb much more than Cd can be seen through the experiment.

Abstract: The ecological restoration of mining wasteland has been highly concerned about the world. Consequences of mining wasteland without governance has brought economic development and human survival posed a serious threat, so the ecological restoration of abandoned mining area has been imperative. This paper summarizes the research status and development process of ecological restoration and abroad, as well as some of the issues raised ecological restoration work currently exists.

Abstract: Experimental study of the ozone through catalytic oxidation treatment sludge and rubbish leachate, The impact of different catalysts dosage on absorption rate of O³CODNH₄⁺-NTPpH and other indicators.The results showed that, Dosing Cu-Ni catalyst can increase the absorption rate of ozone, And rubbish leachate ozone absorption rate is higher than the absorption rate of the sludge supernatant; Ozone oxidation catalyst can improve sludge supernatant and leachate the COD removal rate, the optimum mass ratio of 3; Ozone oxidation of sludge supernatant and rubbish leachate is difficult to NH₄⁺-N and organic nitrogen due to preferential oxidation of ozone to convert it to NH₄⁺-N, NH₄⁺-N within the system led to rise, not fall, overall dosing ozone catalyst for the oxidation of NH₄⁺-N had little effect; Dosing catalyst can effectively improve the sludge supernatant and rubbish leachate TP removal, rubbish leachate optimal mass ratio of 3, the optimum sludge supernatant mass ratio of 7; Rubbish leachate pH, with a small amount of catalyst dosage was decreased, while the pH of the sludge supernatant, then with a small amount of catalyst was increased upward trend.

Abstract: Experiment was based on plus a plant regulator of aerobic composting food waste and sludge mixed, results showed : Ventilation and air supply in different ways, the pile temperature and soluble COD increased with prolonged compost increased first and then decreased trends, pile moisture content, volatile organic matter and water-soluble nitrogen are presented with the composting time has decreased, while the pH value of the hybrid reactor with composting time was down then up trends; Having aeration rate 0.2m³ / h, 0.6m³ / h, 1.0m³ / h of continuous supply trials comparing gas volume of 0.6m³ / h when the best compost and gas volume in the same conditions, the continuous supply way than intermittent air supply composting effect.

Abstract: Total flue gas emission is a crucial quantity for control of environmental impact in thermal power plants. Direct gas flow measurements by Pitot tubes and other sensors are hampered by the very high temperature at the exhaust, high content of carbon soot and frequently turbulent flow conditions, which cause a non-parabolic flow profile across the exhaust cross section. We are developing an optical imaging method for gas flux measurements, using shadow video imaging of the dynamic hot gas emission profile at the power plant exhaust. All, high exhaust gas temperature, pressure increase and carbon soot content cause small variations of the refractive index. This deflects a considerable amount direct sunlight under inclined solar illumination conditions (at approx 38 deg inclination angle), and results in a rather sharp contrast and clear shadow image of the gas flow above the exhaust. This feature is not observable in direct transmission imaging. The distant flow shadow image pattern, as seen on the plant floor, is video monitored over a short time period and the dynamic image evolution digitally processed and analyzed. The presented method is similar to the well known optical so-called Schlieren imaging technique. Initial video processing algorithms and results are presented that provide the flue gas flow velocity directly at the exhaust exit, being close to the expected values, obtained from power plant process parameters.

Abstract: Experiment disodium phenyl phosphate as a reaction basic, stromal hydrolysis produce phenol, the amount of phenol indirectly indicates the activity of Alkaline Phosphatase.Experiment by absorption wavelength, activated sludge volume, disodium phenyl phosphate, aluminum sulfate, reagent, temperature and other factors affecting the determination of Alkaline Phosphatase were studied.The experiments optimal reaction conditions initially identified. At 37°C, when activated sludge volume of 5mL, 15mL disodium phenyl phosphate absorbance measured at the maximum value, highest levels of Alkaline Phosphatase. Results show that, 0.25mL reagent optimum dosage for the trial, the best absorption wavelength through fitting the peak-valley is 590nm.

Abstract: Oil pollution, one of main ways for sea pollution, is seriously destroying marine environment. How to solve the problem effectively has been an important research focus in the world. In this paper, a new burning technique which is named self-sustaining burning is proposed, and it is based on seawater and specialized chemicals. The overall idea of this technique is presented, and one implementation method using familiar CaC₂ and K/Na as main ingredients is suggested. For the feasibility of this oil removal technique, experimental study is conducted. The results show that this technique can remove oil efficiently.

Abstract: Twelve kinds of lignite from different areas of China were used for the study of solid-phase biodenitrification. The amount of released carbon, rate of nitrate removal and acute toxicity were examined for all the lignite samples. The results showed that the averaged nitrate removal rates of lignite from Wangniutan and Zhangjiakou were higher than the others, which can reach above 30%. The averaged removal rates of lignite from Zhaotong, Aksu and Faku were more than 20%, and others were less than 10%. Lignite from Wangniutan, Zhangjiakou, Aksu and Faku were more suitable fillers as biodenitrification carbon for its less luminescent bacteria acute toxicity.

Abstract: Removal of heavy metal ions (Cu²⁺, Pb²⁺ and Ni²⁺) from aqueous solution by raw and modified diatomite was investigated in a batch reactor. The diatomite was modified by acid-wash and base-wash, respectively. The influence of kind of diatomite, contact time and initial concentration of metal ions on the adsorption efficiency were studied. The results showed that the acid-washed diatomite showed the best adsorption capacity for all of Cu²⁺, Pb²⁺ and Ni²⁺) among raw, acid-washed and base-washed diatomites. Metal ions adsorption amount on A-diatomite increased in the initial concentration range from 10 to 50ppm and in general kept constant after the initial concentration was higher than 60ppm. The result also indicated that Ni²⁺ is more easily adsorbed on the surface of diatomite than Pb²⁺ and Cu²⁺.