Advanced Materials Research Vols. 356-360

Abstract: Pot experiments with three local legumes (Trifolium repens L., Vicia Cracca L., Medicago sativa L.) were conducted in five different amendment substrates to research into the revegetation in Lanping, Yunnan province. The main factors of restrict growing of vegetation are lack of nutrient, high concentration of Pb ²⁺ and Zn²⁺ , poor in water-holding capacity in lead-zinc tailings. Trifolium repens L. and Vicia Cracca L. are taken as pioneer plants of lead-zinc tailings according to characteristics of the three local legumes species during the growth periods about indexes of the seeding survival, height, biomass, chlorophyll content, SOD (superoxide dismutase) and CAT (catalase) activity, TF75 (75 percent tailings soil + 25 percent rural soil) amendment approach is more reasonable for the revegetation of lead-zinc tailings in Lanping based on three local legumes species growth indexes and feasibility.

Abstract: The atmospheric-pressure microwave plasma can remove perfluorocompounds (PFCs) efficiently, which have long lifetime and serious global warming implications. However, associated gases such as NOx are produced in the abatement process of PFCs. In order to destroy PFCs and NOx pollutants, TiO₂ catalyst is introduced into the abatement system. The effective TiO₂ catalysts are prepared by a sol-gel method with the ratio of tetrabutyl titanate, ethanol, H₂O and acetic acid = 1: 7: 1: 0.4. The abatement of CF₄ and associated gas (NOx) is carried out with combined microwave plasma and TiO₂ catalyst. The results show that the combined microwave plasma and catalyst abatement system can be successfully used to remove CF₄ and NOx. The destruction and removal efficiency of CF₄ and NOx were higher with the combined catalyst and plasma process than that with catalyst or plasma only.

Abstract: The silver-loaded semi-coke was prepared from Longkou lignite using soaking method by silver nitrate (AgNO₃) solution, and the influence of preparation conditions to the efficiency of silver-loaded was investigated in this paper. Then, a fixed-bed reactor was used to investigate the adsorption efficiency of raw and silver-loaded semi-coke to the gas-phase Hg⁰, the results show that the adsorption performance of silver-loaded semi-coke was improved significantly.

Abstract: This paper will introduce a brand-new deodorization technology, which is whole-process deodorization technology, and its application in Tianjin Jizhuangzi wastewater treatment plant.

Abstract: Experimental on CO₂ removal from flue gas using polypropylene hollow fiber membrane contactors were conducted in this study. Absorbents including aqueous PG, SG were used to absorb CO₂ in the experiments, and comparing with aqueous MEA. The experimental results showed that the mass transfer rate of PG and SG increased gradually in experiments while the absorbent concentration can not be elevated without limitation. That may show the mass transfer rate will be eventually saturated at a certain concentration value. The aqueous PG can be selected to absorb CO₂ in membrane contactors at a lower liquid flow rate to reduce the potential to wet the membrane. Comparing PG and SG with MEA. The performance of PG is superior to SG and MEA under the same operating conditions.

Abstract: The oxidation of sulfide was investigated at a potential of about -0.1 V, 60 °C and electrolyzation time of 48 h, the sulfide ions were oxidized to sulfur and polysulfide, and the predominant polysulphide was S₂^2-. The behavior of the anodic oxidation was highly dependant on the applied temperature and the concentration of the sulfide ions.

Abstract: The dissolution of paper white mud(PWM) has been studied by pH-stat method in various parameters such as the pH values(4.3, 5.4, 6.0, 7.5), sorbent particle sizes (0-0.097mm, 0.097-0.105mm, 0.105-0.3mm), and the reaction temperature (30°C, 40°C, 50°C) in order to investigate the feasibility of using PWM as wet flue gas desulphurization sorbent. The results show that: the lower the pH value is, the higher the dissolution rate; particle size is the direct function of dissolution rate, the smaller the size is, the higher the dissolution rate, the optimal particle size in this work is 0-0.097mm; and reaction temperature has slightly influence on PWM dissolution. Kinetic analysis of the results show that the PWM dissolution is controlled by fluid film diffusion according to shrinking core model and the activation energy is 11.9±0.7 kJmol-1.

Abstract: The paper introduces the structure and working principles of the diesel-LNG electronic injection system. For a further experimental study, the author transforms a X6170ZC-19 diesel engine to a hybrid-fuel engine by installing this electronic injection system, and the load characteristics experiment of which testifies that: the diesel-LNG diesel engine can accurately measure the natural gas consumption and can thus control fuel consumption; it also possesses high replacement ratio. In addition, comparing to pure diesel engine, the hybrid-fuel engine has lower fuel consumption and thermal load, and a better performance in environment protection.

Abstract: In order to achieve the catalytic oxidation of the low concentration SO₂ flue gas in SNOX process, screen out the appropriate type of V₂O₅ catalyst for high-efficient transformation of the low concentration SO₂. In order to provide foundation for reaction progression design, calculate the reaction depth of the process condition through the reaction thermodynamics analysis. According to the technological factors of affecting the effect of catalytic oxidation, investigate the reaction temperature, the space velocity and the mole ratio between O ₂and SO₂ on the SO₂ transformation. Based on the experimental results, we did the reaction kinetics calculation. Above theoretical and experimental results provide the necessary technical parameters for designing catalystic oxidation of the low concentration SO₂ in SNOX process.

Abstract: By using ACF as the cathode, acid scarlet 3R as simulated wastewater, the experiment researches into the effect of current density, aeration, electrolyte concentration and the initial pH value on the color removal of wastewater. The results showed that: ACF cathode has a strong adsorption capacity. Oxygen is reduced to H2O2 and other oxidizing substances H2O2 on the cathode surface .Therefore, it has a strong degradation capacity to dye, which is far better than that of the stainless steel cathode; Lower operating current density helps reduce processing costs; Higher electrolyte concentration and aeration is not necessarily better, which follows certain rules; The treatment is effected greatly by the initial pH, and the effect of decolonization in the acidic conditions is better than that in alkaline conditions. When the current density is 6Am/cm², electrolyte concentration is 0.04mol•L-1, aeration capacity is 0.2m3/h, initial pH is 3.5 and the time of treatment is 70min, the decolonization rate of wastewater is 95.30 %.