Advanced Materials Research Vols. 113-116

Abstract: To improve the efficiency of petrochemical wastewater treatment, a hybrid system with both attached and suspended biomass was proposed to replace the existing biofilm process. According to the performances of the hybrid system, the optimal suspended biomass concentration in the tank was determined around 1000 mg/L. When the average influent COD and NH4+-N concentration were 395.7 mg/L and 13.5 mg/L, the according removal efficiencies of the hybrid system were up to 84% and 69%, compared to 74% and 20% when operated with the biofilm system. The GC-MS analysis showed that both the amounts and types of refractory organics in the effluent of hybrid system were greatly reduced when compared with those of the previous biofilm process. The foaming problem was also resolved along with the enhanced pollutants removal efficiency. The hybrid process was an economic and feasible alternative for petrochemical wastewater treatment, which ensured carbonaceous oxidation, nitrification and decomposition of refractory substances.

Abstract: In this paper, TVOC emission of veneered wood-based panel and coating processing was systematically discussed. The results showed that resin content and hot-pressing temperature of veneered wood-based particle board had obvious impact on TVOC releasing. When velocity of flow was 0.02 m/s, after 10 hours experiment, TVOC concentration in the environment chamber was 263μg/m3. While velocity of flow 0.04m/s, TVOC concentration was 29 μg/m3. High-flow velocity was helpful for rapid dissemination of TVOC. The research also found after 10 hours experiment, concentration of TVOC in environment chamber is 31μg/m3, 220μg/m3 and 400μg/m3 corresponding amount of paint was 20g, 40g and 60g. The thicker the layer was, the longer the time of layer dehumidification and TVOC diffusion needed.

Abstract: Mechanical behavior of municipal solid waste (MSW) is important to geo-environment engineering, and it is necessary to properly understand it. Laboratory direct shear tests were conducted on MSW with 3 short fill ages, namely 1d, 4d and 7d. Three different densities were taken into accounted in each fill age. Experimental data show that MSW’s shear failure still satisfies the Mohr-Coulomb criterion. As to bigger density, shear strength of MSW increases within 1-7d fill age. When density becomes smaller, its shear strength increases within 1-4d fill age but decreases within 4-7d fill age. With fill-age developing, friction angle of MSW increase monotonously, but cohesion force of it first increases and then decreases. Experimented shear stress-displacement curve of MSW can not be well fitted by either hyperbolic model or exponential model. This experimental research is helpful for design and numerical simulation of corresponding MSW landfill.

Abstract: As one of the carbon trade mechanisms ratified by Tokyo Protocol, the Carbon Emission Permits Trade has played a significant role of offsetting the global warming problem. This paper introduces the international carbon emissions trading market mechanisms, transaction type, and volume and price, and then analyses the status of carbon emissions trading at home and abroad. Finally, the author puts forward construction carbon emissions trading in China.

Abstract: The water resources carrying capacity is an important component of natural resource carrying capacity in a country or region sustained development process. It is the key being related to using the water resources reasonably, which means vital to the sustained growth of the water resources, the social economy and the ecological environment concordant development.Taking the case of river basin in arid zone of the Manasi River Basin,The author evaluated water resources supporting capacity condition basin in different year of the Manasi River by establishing fuzzy comprehensive evaluation model. The results indicated that because of saving water technological progress and industry restructure advancement, the water resources carrying capacity of Manasi River will be improved in the future twenty years. The water resources supply and demand contradictory will be obtained certain alleviation, but the uneven of water resources space and time distribution is still the main restrictive factor of the development of society and economic and the ecological environment construction.

Abstract: Mung bean grows widely in the world, and is the good source of mung bean starch, which contains higher content of amylose and has special gelling properties. Isolation methods, molecular structure (x-ray pattern) and important physiochemical properties of mung bean starch and influencing factors in recent studies were reviewed, which is helpful for the further and comprehensive use of mung bean starch.

Abstract: Abandoned Aspen products have become one of the major solid wastes in China. This Paper discusses the recycling design of wooden Aspen products by employing advanced technology and mature processing methods. It will contribute to the establishment of a wood-saving industry in China.

Abstract: The main objective of the present experimental investigation was to evaluate the performance of using a refitted anaerobic reactor system to treat the water hyacinth press juice. The biogas production rate was rapidly rising from 25 L.d-1 to 54 L.d-1 in the first few start-up days, there was approximately 1332 L biogas measured by wet gas meter and 62% of methane was detected during the experiment period. At the end of the anaerobic digestion treatment, it could be observed about 83.5% COD, 85.7% SS and 74.1% SS of the initial content was removed, declined from 7428 mg.L-1 to 1223 mg.L-1, from 6748 mg.L-1 to 967mg.L-1 and from 2315 mg.L-1 to 600mg.L-1, respectively. TN declined from 127.8mg.L-1 to 88.0mg.L-1 with a total loss of 31.2%. The variation of TP in the whole process was gradually declined, from 34.3mg.L-1 to 25.0mg.L-1, had total 27.1% lost. In the whole digestion process the pH increased slowly from 6.8 to 7.8. On the basis of the experimental results obtained, it is possible to conclude that: the refitted anaerobic reactor system for water hyacinth press juice digestion was practical and effective.

Abstract: According to its advantages, such as low-cost and green biological etc., Wood-Plastic Composite(WPC) is more suitable for make parts by Selective Laser Sintering(SLS) rapid prototyping (RP) process. With optimal design of components, the parts made by WPC have good mechanical properties as well as with good laser sintering properties. In order to further improve the surface quality of the parts, the post-processing–infiltrating with wax–is introduced. After post-processing, the void fraction is decreased from 51% to 7%, surface quality has been greatly improved, Ra belows 13µm on average, after polishing the surface is more smooth and Ra belows 5µm averagely，compared to those without post processing, surface roughness decrease 22% and 73% respectively.

Abstract: Acetylspiramycin pharmaceutical wastewater is a kind of biorefractory organic wastewater. It is meaningful academically and actually that the Photo-Fenton method is used in the oxidation and degradation of the effluent water. After pretreatment of the wastewater with COD 6169mg/L, the oxidation reactions were proceeded which the oxidation effects were evaluated by the changes of COD and BOD5. Orthogonal experiment was applied based on the single factor experiment, the optimal process conditions were determined as follows, the volume ratio of H2O¬2: FeSO4•7H2O 1:1, the dosage of FeSO4•7H2O 7.8mmol/L, the pH value 3.0 and on the solar ray radiation respectively. Under the said conditions, the ratio of BOD5/COD went from 0.15 to 0.24 indicating that biodegradability had improved. Meanwhile COD reduced largely. The removal rate of COD calculated on this stage reached 78.9%. Added to the former pretreatment process, the total removal rate of COD was up to 88.6%. It was higher than other disposal technologies of antibiotic pharmaceutical wastewater and displayed a promising future.