Advanced Materials Research Vols. 926-930

Abstract: Through the research on field macrofeature and microscopic feature we found that forming process of the WZD bauxite have experienced three stages: at first, Hanjiadian formation and Huanglong formation take lateritization generate laterite, laterite is the precursor of the bauxite; In the second, laterite has been transported and deposited in WZD area; At last, loose sediment outcrops accompanying regression, and then accept eluviation, in the process of eluviation disadvantage elements as iron and silica have a great scale of runoff, aluminum has the least loss result in the forming process of high grade bauxite.

Abstract: Papermaking industry generates a considerable amount of wastewater including varieties of pollutants. This paper reviews the ordinary processes of treating papermaking wastewater, and introduces the merits and demerits of these processes. The latest technologies are summed up. A forecast is made through all the methods in recent years. The waste to waste process is particularly promising because of its remarkable economic and environmental benefits.

Abstract: Along with containing more and more PM2.5, the atmosphere is getting more and more harmful to the human’s health.Therefore, the reseach in PM2.5 characteristics and governance method is extremly significant.In this thesis, the stepwise regression,that is used to analysis the relevance between the PM2.5 concentration and the total concentration of the five other elements of the AQI(Air Quality Index) are introduced firstly.Then the 3-dmensional concentration distribution model in regard to the 10 atmospheric monitoring points of Wuhan is simulated by Matlab, which can reflected the PM2.5 concentration distribution in the space.Considering the teprature, humidity, wind velocity and visibility, the thesis set up a non-linear function, and simulated each parameters to get the PM2.5 generation model.In addition, the diffusion model is set up based on the gauss diffusion model.The comprehensive governance non-linear programming model is set up based on the approapriate constraint conditions, and the final governance programming is obtained by the Lingo simulation.

Abstract: This study constructed a non-aqueous phase liquid (NAPL) coupled model which researched on the migration process in vadose zone and aquifer using the software of HSSM and Visual MODFLOW. The paper predicted the risk of benzene leaching accident which is the typical pollution of petrochemical industry. A quantitative analysis of groundwater contamination and the adjacent sea area pollution impact was conducted. The results showed that benzene can infiltrate through the vadose zone and form lens on the aquifer water table causing long-term pollution to the groundwater. The total amount of benzene transporting into the sea would up to 3428 kg in 8.2 a which will cause adverse effects on marine water quality and ecological environment.

Abstract: Properties of the ore were studied by chemical analysis and Lead phase. Research shows that the lead tailings contains 15.47 g/t of silver and 0.62% of lead, lead minerals are mainly Galena, Anglesite and Finnemanite, Silver minerals and galena symbiosis, besides, gangue minerals are mainly quartz. Based on properties of the tailings, flotation feasibility pilot study was conducted. Results show that excellent test indexes that a Ag grade of 137.09 g/t with a Ag recovery of 55.27% and a Pb grade of 5.85% with a Pb recovery of 60.35% were obtained under the used process and reagent system conditions.

Abstract: After Three Gorges reservoir impoundment, sediment transport and bed evolution characteristic had changed in the lower Yangtze River. Based on the observational data, sediment transport and bed evolution characteristic of Jiepai reach had been analyzed. The results showed that Jiepai reach evolution had a close relationship with income flow and sediment conditions. In recent years, the income flow and sediment conditions were propitious to the development of left slot of heart beach. It also had accelerated the low beach erosion in transition section and siltation in Xindijia. A 2-D mathematic model and river physical model had been used to forecast the river evolution trend. The results showed that the staggered beach would still not stay steady with the reservoir impoundment. The periodic time of evolution could become longer. Xiru bank beach in right bank of upper Jiepai reach would deposit and move downwards. The main stream discharge would centralize and increase. The left channel of heart reach would be eroded and the right one would dwindle gradually by the squeezing of the heart reach. The right branch channel, as the main navigation channel, would deposit and become shallow. The transition reach would move downwards at outlet of left channel. The riffle would present a staggered shape and left branch channel would dwindle gradually. The waterway transportation condition would get worse.

Abstract: Based on the root cause analysis and statistics of typical Ammonia leakage accidents which happened during 1980 to 2010, it is pointed out the main measures to prevent it. This Paper conducted a systematic analysis of the five main factors for Ammonia leakage. Finally, this paper described atmosphere and the earth's surface exert influence on Ammonia diffusion.

Abstract: Low carbon tourism is necessary and feasible by analyzing the advantages and disadvantages of low-carbon tourism in Qinhuangdao city. Tourism traffic and building energy consumption should be the key point of carbon emissions in the future tourism. Some suggestions have been raised up such as optimize the tourism energy utilization, construct and promote low-carbon tourism demonstration areas, make environmental education to the tourists through various means and low carbon tourism professional knowledge training to the employees, arouse the enthusiasm of residents to participate in low carbon travel, improve the system of norms and strengthen management, and so on.

Abstract: The Madang river reach in the lower Yangtze River is multi-branched and slightly curving. This paper combines measured data analysis with planar two-dimensional flow and sediment numerical modelling. Navigation-obstruction characteristics and waterway regulation measures were also researched and revealed the following problems : The south branch of the Madang reach is the main branch where the river regime is very stable. Navigation-obstruction characteristics primarily show that the right branch entrance at the Mianwai Sandbar may have a problem of insufficient water depth. The main flow of the right branch entrance of Guazihao Island (in the area of sunken ships) may result in navigation depth deteriorating. The transition section at the entrance of the Dongliu straight waterway is narrow and shallow. These problems can be solved by a series of remedial measures, including implementing beach protection projects at the head of the Mianwai Sandbar, a submerged dike in the left branch of Guazihao Island, a fish-bone type dividing dike at the head of Guazihao Island, a spur dike at the tail of Guazihao Island, and bank protection at key position. The aims of these measures are: aim to stabilize branches and create a better configuration of Guazihao Island for stabilizing the main flow of the right branch entrance of Guazihao Island and enhancing the transition shallow incision.

Abstract: Channel characteristics in the middle and lower reaches of Yangtze river were complicated and changing, which showed up as mainstream swing frequently, staggered beach moving down significantly, delta and channel change dviolently.etc. In this paper, navigation-obstruction in the Jiepai Reach in the middle reach of the Yangtze River and its countermeasures were discussed based on the analysis of the historical riverbed evolution of the Jiepai reach. The Jiepai Reach is characterized by a frequent sway of mainstream, significant moving down of the intersectional point bar, and drastic changes between main channel and floodplain. Navigation-obstruction in the Jiepai Reach can be described as follows: the dredged channel location is very unstable, leading to the navigation obstruction of refloating in the frequent transition between the left and the right branch. Besides, the frequent sway of mainstream causes different levels of damages to the existing regulating structures. These problems can mainly be attributed to the unstable and less controlled distribution of the Jiepai reach between main channel and floodplain. The general idea of regulating the Jiepai reach is: based on the existing projects, according to the facilitating pattern of main channel and floodplain during the river evolution, appropriate engineering measures can be taken to gradually form efficient patterns between main channel and floodplain phase by phase, which will improve the navigation conditions. In the early stage, bar protection engineering should be implemented in the transition section the low shallow beach, which controls an appropriate location of the transition section, and promotes the formation of a stable transition channel. In the later stage, according to the adjustment of the channel, dam and bar protection structures can be applied in the control engineering of the upper point bar and beaches above Luoshan. Model test results showed that the implementation of the project could produce sound regulation effects, and efficiently improve the navigation conditions.