Advanced Materials Research Vols. 602-604

Abstract: A new composite material was prepared by using pulp sediment as matrix, and used rubber powder as toughening agent to recycle both wastes. The effect of used rubber powder content on the pulp sediment properties, the morphology and curing conditions of used rubber powder / pulp sediment composites were studied. The results show that the mechanical properties of used rubber powder / pulp sediment (8/100) are good. The fracture surface of used rubber powder / pulp sediment (8/100) samples are well-distributed by scanning electronic microscopy (SEM) analysis. The best formulation is 100 phr pulp sediment and 8 phr used rubber powder, and the best curing conditions are at temperature 150 °C under 5 MPa for 15 minutes.

Abstract: Scandium is an important rare earth element. Stacking of red mud has caused serious environmental and social issues. Red mud is rich in scandium. In this paper, recovery of scandium from red mud by emulsion liquid membrane (ELM) was studied. Composition of ELM is P204-Span80-sulfonated kerosene-HCl. Effects of mobile carrier and surfactant concentration, Roi, Rwe, internal and external aqueous phase acidity on the extracting rate of Sc3+ were studied. Results show that it is feasible for P204-Span80-Sulfonated Kerosene-HCl ELM System extracting Sc3+ from red mud leaching solution. The optimum condition is P204=12%, Span80=3%, Roi= 2:3, Rwe=6, the internal aqueous c(HCl)= 4mol/L, the external aqueous phase pH=2, the time of making emulsion is 20 minutes, extracting time is 15 minutes. The extracting rate of Sc3+ can reach to 99.6% under optimal condition. The extracting rate of other impurities is lower than 5%.

Abstract: Using natural-zeolite as main raw material, prepare spherical composite zeolite filter material by adding adhesive, pore-forming agent, etc. By measuring cylinder compressive strength apparent porosity and adsorption capacity of ammonia and doing orthogonal experiment, the optimal process combination is C3A1B3, namely ω zeolite powder : ω adhesive : ω pore-forming agent =55%：35%：10%, activation temperature is 150°C, activation time is 3h.The end product’s packing density is 674Kg/m3, cylinder compressive strength is 4.32MPa, and apparent porosity is 59.02%.

Abstract: Due to the difficulty of conserving the water and soil of the hillside land in the catchment basin Area, it tends to produce high-turbidity raw water during the initial period of typhoons or storms and affect the operation of the Purifying System. In this Research, the raw water presenting varied turbidity levels was sampled from different depths under the water surface to simulate the change of the water quality. During the research, a Barrier Board was used to extend the flowing route and the level change of the overflow; further, varied flow rates were also employed to carry out the pre-treatment of high-turbidity raw water in order to study the changes of particle size of the influent and effluent water. In respect to Particle Size Analysis, the Particle Size (D98) of the High-turbidity Raw Water was roughly between 100~125μm; after the pre-treatment with the Barrier Board, the Particle Size at ＜D10 was between 0.73~2.13μm. With the increase of accumulated particle size percentage, the effluent water was able to reach <25μm at D98 of Particle Size under the low rate (8ml/s), the effluent water D98 was able to reach <10μm, which is an outstanding removal effect. In view of this, a certain degree of effect could be achieved by treating the High-turbidity Raw Water before it settles.

Abstract: Thermoplastic polymer composites reinforced by bamboo fiber are environmental friendly composites, which are made from fiber reinforced materials and thermoplastic matrix. In this paper, the interfacial compatibility of the bamboo fiber/thermoplastic and affected factors were briefly analyzed, and improving methods of the interfacial compatibility were introduced. The methods included bamboo fibers modification, thermoplastic resin chemical modification and adding compatibilizer.

Abstract: This study utilized three different compost production methods, the conventional aerated system (CAS), the anaerobic barrel system (ABS), and the rapid-disposal machine (RDM), and observed the related mung bean germination rates, which are indicators that assess the maturity and quality of compost. All three production methods used the same kitchen waste, and reached maturity after 24 days, 60 days and 5 days, respectively. Mung beans were then seeded to test their germination rates. The results showed that by the fifth day, RDM had the best germination rate, followed by the CAS and ABS. However, the former method had a poor root growth, while the other two had ideal situation root growth conditions. After another five days passed, the roots of the beans grown in the RDM compost started to turn black. At the seventh day, the RDM beans all decomposed. However, the young roots of the beans grown in CAS and ABS compost did not suffer in this way.

Abstract: Membrane technology is a promising alternative to conventional technologies for the mitigation of CO₂ from power plant flue gas due to its engineering and economic advantages. In this paper, CO₂ post combustion capture by gas separation membranes and gas absorption membranes was extensively summarized and reviewed. In addition, advantages and disadvantages of the technology, current status and future research direction of membrane technology for CO₂ capture from power plant flue gas were briefly prospected and discussed.

Abstract: We have reported the environmental and economic effects of VRLA recycling methods. The possible waste water, solid and gas produced in the recycling process are fully discussed. Through proper treatments, the wastes can be emitted according to corresponding standards. And careful disposal of VRLA results not only in less environmental pollutions, energy and mineral resources consumptions, but also in considerable economic profits.

Abstract: This study crushed kitchen waste in the size of 0.8--2.4 cm. and control the water content to improved the treatment efficiency and accelerate the composting process. Reduce the process composting time in a short duration of 21days（Usually more than 40 days）. The quantity of volume reduction of kitchen waste was 77%. The compost materials were analyzed. This study produced good quality compost. The final compost material provided good humus to build up soil characteristics and some basic plant nutrients ensuring environmental health and supporting food production.

Abstract: In our study, a new kind of water treatment composite was prepared by melt blending and molding foaming, with synthetic rubber EPDM as the matrix, graphite oxide modified glass fiber (GF) as the filler. The foamed composite had a certain adsorption capacity of methylene blue dye in the water and toluene. With the increase of the graphite oxide modified GF, the composite on the methylene blue adsorption rate was increased, however, for toluene, the rate of adsorption was reduced. Due to restrictions on the oxidation of graphite and composite structures and the adsorption capacity of the material was limited.