Advanced Materials Research Vols. 573-574

Abstract: The study area and plant 928786 trees, of which the most enjoy trees, accounting for about 45.6% of the total number of trees in the city. Eight of the region in the study area covered 2.7-7.9% of trees. Salix matsudana, Populus pseudo-simonii, Pinus sylvestnis var. mongolica Litv, Pinus tabulaeformis var.mukdensis Uyeki and Prunus persica f. rubro-plena is the most important species, they represent 32.2% of the number of all the trees, leaves area of 50.6% and 43.1% of the leaf biomass. The city a lot of trees concentrated in diameter at breast height 15.3-38.1 cm. In general, the tree is younger Changchun city (50.7% of DBH less than 23 cm). A large part of Changchun city area (accounting for 54% of the whole city) is by impervious material, asphalt, cement, stone cover, and the remaining 46% is permeable ground, herb areas, lawns and a small proportion of the pond, artificial lakes and rivers.

Abstract: Through the studying a typical area and investigating, the authors focus on the water environment in rural residential areas. Problems related to it even have been the core of the new rural construction. Mainly they are: Water environment within rural settlements in serious deterioration, Modification of the capacity declining and Isolated to the irrigation system. Some suggestions are also put forward to these problems. Something must be done to ameliorate and improve the water environment of the residential area in rural region.

Abstract: Pollution-free underwater oil storage model is raised, realizing zero-pollution underwater oil storage with oil-water replacement through flexible separation method to prevent crude oil from directly contacting seawater. Experiment on thermal insulation of underwater crude oil with separate replacement of oil and water was made, proving that high pour point crude oil does not change significantly within a time and still possesses a good liquidity. Therefore, it is feasible to apply this underwater oil storage system to the storage of high pour point crude oil.

Abstract: In this paper, put forward a real-time navigation method adopted in the process of 3D virtual geographical scene roaming, which get the real combination between the virtual reality technology and mature GIS applications. And it has realized the entity location, property information, the management of the buffer zone and other functions through the geographical coordinates of the earth's counterpart in the 3D virtual geographical scene. However, the functions are likely to bring out only if it is in the 2-D environment previously. It has provided an effective assistance for the daily management. And the solution has been proved that not only is applicable to the basin simulation system development, but also has referenced value in involving the development of the GIS simulation.

Abstract: According to water quality characteristics, coagulation and micro-electrolysis process was utilized to the treatment of concentrate liquid of membrane landfill leachate. Working parameters were optimized through single and orthogonal experiments. The experimental results showed that under the optimum conditions, remova1 rates of COD, TOC, UV254 and chromaticity reached 76.8 %, 79.6 %, 81.1 % and 70 %, respectively. The value of BOD5/COD increased from 0.03 to 0.31 and E2/E4 increased from 12.4 to 38.5. The biodegradability of wastewater was improved significantly, which was advantageous to the subsequent bio-treatment. It can be concluded that the process of coagulation and micro-electrolysis is an attractive alternative for the reuse and volume reduction of concentrated liquid of membrane landfill leachate.

Abstract: In this paper, synthetic evaluation method with nonlinear power function for membership function and systematic procedure are presented with set pair analysis theory. The case study shows the presented method works well in one building site of Bohai Bay and has advantages of concision, easy-operation and high precision, so the evaluation results are credible.

Abstract: UASB is used to treat chemical wastewater with high concentration organism. The successful starting of UASB is the taking shape of granular sludge. The operation of the project showed that：the consistence of CODcr was 3500 to 5000 mg/L in the influent, 1000 to 1200 mg/L in the effluent. UASB started-up successfully with the removal rate of CODcr was 80% and the system had stable operation.

Abstract: Long-term excessive extraction of groundwater has caused many environmental and geological problems such as depression cone and land subsidence in the city of Cangzhou, China. In order to analyze the variation of groundwater levels in over-exploited area and predict the evolution after decreasing pumping along with the South-to-North Water Diversion project, a 3-D transient groundwater flow model was established. The results show that several depression cones have formed in shallow and deep aquifers in recent years. In addition, the area of the depression cones would decrease and the centre levels of them would ascend by restrict exploitation of deep groundwater after the implementation of the South-to-North Water Diversion project. The work can provide a scientific basis for reasonable water resources allocation with the South-to-North Water Diversion project in Cangzhou city.

Abstract: Due to the relatively unprogressive economic and social development of Songjiang rural areas of Shanghai city in China, the degree of rural domestic sewage treatment was relatively weak and hysteretic. The rural sewage treatment systems of Songjiang district were investigated through field survey. Finally, the systems of soil infiltration-constructed wetland and combinatorial biofilter, with obvious advantages, were proposed to popularize in Songjiang rural areas more suitably.

Abstract: Coking wastewater is generated from metallurgy industry and it contains many highly toxic substances. Because the coking wastewater would bring about severe environmental pollution, it is best to reuse it as circulating cooling water. However, there are large quantities of ions in coking wastewater, which would cause serious corrosion to the pipe and the devices in the process of recycling. Therefore, desalting techniques are necessary for the reused of coking wastewater. Electrosorption technique (EST), as a new type of water treatment technology, can meet the economic benefits of water treatment technology. It also can achieve better water quality and reliability standards which have never been achieved before. In this paper, a new electrosorption device was invented and it was used for desalting of coking wastewater. The main parameters affecting the electrosorption of ions including voltage, electrosorption time, pH value, temperature and electric current have been investigated in detail. Under the optimized experimental condition, after electrosorption process, a salt removal rate of 75% was obtained. The quality of effluent could satisfy the criterion of industrial circulating cooling water (GB 50050-2007) and could be reused as the circulating cooling water in coking plant.