Advanced Materials Research Vols. 838-841

Abstract: The article discussed the demolition way of antiquated buildings and the influencing factors of strategy optimization, and then it set up the index optimization system, using fuzzy analytic hierarchy process (FAHP) to determine the demolition scheme for the antiquated buildings, and ultimately selected the optimal way. Through comparison and analysis, selective demolition is the optimal choice in the demolition process of the antiquated buildings.

Abstract: According to the consolidation practice and the special characteristics of land in the saline area with high soil salt content and less nutrient content, this article adopted salt separated material (A), the depth of the salt separated material (B) and amendments (C) as factors to improve the soil property by designing 3 factors of 3 level orthogonal variance analysis. Based on it, the better drainage scheme can be chosen and it can provide guidance on land consolidation in the region. The results showed that: after soil improvement, the soil bulk density, pH and salt content decreased significantly, the content of effective nitrogen, phosphorus and organic matter showed an upward trend, but a slight decline in effective potassium. Compared with the control group, the soil properties, mainly nutrients, crop biomass and yield significantly of the test groups were significantly improved, and the indicators were significantly different. After comprehensive consideration, the best improvement program is A2B2C1, and the slag and straw, 60cm and organic fertilizer are selected as the salt separated material, the depth of the salt separated material and amendments respectively.

Abstract: The frequency and time of precipitation can influence the storage, allocation and management of water resources. But the precipitation frequency becomes more random and the precipitation process becomes more complexity due to the climate change and human activities, which increases the difficulty of technology and management. In this research, the fractal dimension based on Continuous Wavelet Transform (CWT) as the index of the precipitation complexity is applied to describe the precipitation process; using it, the complexity distributions of different precipitation processes in Liu-Kuang zone of Qingzhang basin China in different periods is illuminated respectively. The result indicates that in research region: (1) the annual precipitation frequency in the late period is less than that in the early period; (2) the urbanization and human activities increase the precipitation frequency. This result can reflect the frequency change of precipitation in changing environment and provide reference for the decision-making of water resources management in the local basin.

Abstract: This paper is to study the optimum conditions for extracting the protein feed by using the mixed microbial fermentation. And using the single factor and orthogonal methods, the microbial content as the main indicators, investigated the effects of the combination of strain, strain ratio, the amount of bacteria, fermentation temperature, the concentration of fermentation, fermentation pH, nitrogen sources and inorganic salts and other factors on the fermentation of protein yield. The test results showed that the best fermentation process is sterilization process, the best combination of strains of Geotrichum candidum, Candida tropicalis and Candida utilis yeast, the cast of bacteria was 10%, the best molasses fermentation concentration 20g / 100 mL, and temperature 30 ° C, initial pH 5.0, appropriate amount of Yeast extract, magnesium sulfate, potassium dihydrogen phosphate and super phosphate. The Test provides a theoretical and experimental basis for Molasses wastewater utilization

Abstract: A sequencing batch MBR-RO system has been developed to treat coking wastewater, focusing attention on the COD and TN removal efficiencies. Operational results over 60 days showed that the sequencing batch MBR-RO system had a great impact on removals of COD and TN. the removal efficiencies of COD and TN were 93% and 96% respectively. Final concentrations in the effluent of 0.24 mg phenols/L, 0.02 mg cyanides /L, 28.7 mg COD/L and 4.53 mg TN/L were obtained. In addition, the flux of MBR and RO lost 65.3% and 73.2% respectively.

Abstract: The modified digested sludge (MDS) can be used as landfill biocover that serve to minimize CH₄ emissions by optimizing CH₄ oxidation. MDS composited by coal ash and digested sludge was studied in this paper. The permeability coefficient and the compressive strength of MDS were tested in full factorial L₉(3⁴) experiment using simulation column. Results show that when the mix ratio of coal ash and digested sludge is about 1:1-1.5:1, the permeability coefficient < 10^-4 cm/s and compressive strength 50 kPa, MDS can meet the engineering requirements for landfill operation. The optimal conditions of MDS were as follow: mix ratio of coal ash/digested sludge = 1:1, nutrient solution = 0.05 ml/g, thickness of biocover = 400mm, and moisture content of MDS = 40%. The maximum CH₄ oxidation efficiency was 88.6% and the volume flow rate of CH₄ was 0.75 mmol/(kgd) under the optimal conditions.

Abstract: It had validated by experiments why appending rare earth nitrate (REN) into the bath affects notably on development of coating-forming, corrosion resistance as well as on urgency varieties of appearance and component of the coating. The causation rests with the fact that REN not only makes metal surface depolarized and cathodic reactions accelerated, but also acts as crystal nucleus with gel forms on the metal surface to speed up the coating-forming and develop the anti-corrosion capacity of the coating. The optimal level of addition of REN is 30-55 mg·L^-1.

Abstract: Experimental results show that the samples gained in bath added Rare earth nitrate (REN), relative to the sample got in bath without REN, improve the anti-corrosion power of the coating because of increasing of covering rate of formless crystal Zn2Fe(PO4)2·4H2O (marked P) crystals and the ratio of P/(P+H) (H is the mark of Zn3(PO4)2 crystal) in the coating, combination of which with components parsing by EDS indicates that the sequence of contribution elements P and Zn to erosion resistance of coatings is P>Zn. And the correlative mechanism was discussed, which has it clear that RE is materially a catalyst holding excellent ability of carrying oxygen and cathode depolarization, its concentration gets so constant in certain range that it is much steadier and more efficient than the usual consumptive oxidants like nitrates. In a word, REN plays the role of surface regulator, accelerant and densification agent, which speeds up the phosphating, and bids it effective to enhance the anti-corrosion power of the coating. The addition of REN, not only promote the phosphating film formation and substantial reduction or exemption of nitrite. So, REN is green phosphating accelerator of live up to one's name.

Abstract: Carbon footprint of three scrapped cable and wire recycling processing plants was analyzed by examining the annual carbon emission and trend for 2009-2011. Among the six greenhouse gases (CO₂, CH₄, N₂O, SF₆, HFCs, and PFCs), the annual emission of CO₂ was the highest (>95%), while remaining gases only accounted for less than 5% of the total greenhouse gas emission. When analyzing the collected data based on different frontier categories, Category II (greenhouse gas emission indirect caused by electricity consumption) had the highest emission proportion (>57%). It is because the machines used for the physic-mechanical processing procedure require a lot of electricity. In order to do emission inventory accurately and control the electricity consumption, laws or regulations should stimulate electricity consumption to be recorded and monitored separately for each operation permit. It is also recommended to record and monitor electricity consumption of administration area and the manufacturing/processing area separately. Results of this study revealed that the average emission factor for processing recycled cables and wires using a physic-mechanical method was 0.0474±0.0162 tonnes of CO₂e per tonne of material processed. If the calculation was based on the amount of products generated, the EF of average greenhouse gases was 0.1613±0.0589 tonnes of CO₂e per tonne of plastics, 0.0766±0.0278 tonnes of CO₂e per tonne of copper, 1.7891±1.4572 tonnes of CO₂e per tonne of aluminum, and 2.1030±1.6937 tonnes of CO₂e per tonne of iron.

Abstract: With the highly praised development of low-carbon and implementation of western development strategy, the various industries of northwest faced great stress with how to weigh the economic growth and reduce carbon emissions. In this study, based on the data about energy consumption and GDP in the construction industry of five northwestern provinces, and estimates the carbon emissions of construction indirectly. Then combined with Decoupling Theory analysis the interacted impact among carbon emissions, energy consumption and economic growth in the construction industry of five northwestern provinces .The results shows that the development of construction industry in provinces is still based on high energy consumption and high carbon emissions, but each impact degree of them are different. Finally, put some suggest improvements to reduce the energy consumption and carbon emissions in the construction industry path of five northwestern provinces.