Advanced Materials Research Vols. 518-523

Abstract: In this paper, ultrasonic cavitation degradation was applied to treat the wastewater containing nitroaromatic compound. The factors influence to treatment effect such as the ultrasonic power and frequency, the wastewater initial pH value, were investigated by experiment. The experimental results showed that air-blasting in ultrasonic cavitation treatment could effectively improve treatment effect. The wastewater（COD:2650 mg•L-1,BOD5:240 mg•L-1，p-nitroaniline：490 mg•L-1，nitrobenzene:100 mg•L-1）was treated by ultrasonic cavitation degradation, the removal rate of p-nitroaniline,nitrobenzene and COD could be reached 91.3%,90.6% and 83.9% respectively after 3h. Biodegradability of the wastewater (B/C ratio ) can be increased to 0.4 , which satisfied the requirement for the subsequent biochemical processes.

Abstract: In this study, a magnetlectric oxidation biological filter (MOBF) was investigated for the removal of organic pollutants, heavy metal ions and cyanide ions in electroplating wastewater. The influencing factors including the inlet water flow, external DC voltage, aeration rate of the MOBF on wastewater treatment performance were studied. Data analyses show that with iron-carbon tube as the core component, the MOBF’s removal rate for COD, Cr6+, Cu2+, Zn2+ and CN- were 93%, 99.99%, 99.7%, 96% and 99%, respectively. The best treatment conditions for the MOBF were as follows: the inlet and outlet pH value of 3.5 and 8.5 respectively, the external voltage of 3.8V. When the inlet wastewater flux is 40L/h, the aeration rate is 1m3/h.

Abstract: Abstract. Ammonia is known as one of odorants emitted from landfill sites and several techniques such as deodorant spray, adsorption/absorption processes and incineration have been used for its removal. Among the measures to solve the problem of odor, spraying of deodorants such as diluted essential oil will be promising. This study was carried out to investigate the characteristics and mechanism of ammonia removal by monoterpenes of essential oils. Chemical composition of the essential oil has been analyzed by GC-MS, an ammonia test tube was used to determine ammonia concentration and thus quantify the ammonia removal characteristics of monoterpenes and essential oils, and the interactional mechanism between ammonia and limonene was investigated with 1H NMR spectrometry. The results indicated that the efficiency of ammonia removal by limonene was improved by increasing the molar ratio of limonene to ammonia. Comparison of 1H NMR spectra before and after the interaction of limonene and ammonia showed that the chemical shifts of hydrogen atoms distant from the double bond had the largest changes, the shifts of these signals to lower magnetic field. The interaction interfered with the magnetic spin of the hydrogen atoms and reduced the peak splitting. When the molar ratios of the essential oil of pine needles, β-pinene, α-pinene and limonene to ammonia were 15, the removal rates of ammonia at 100C were 100, 86.0, 72.0 and 46.5%, respectively.

Abstract: In order to discuss the effect of voltage on treatment of phenol wastewater by three-dimension E-Fenton. The paper mensurates the removal rate of phenol and current density, Faraday efficiency under different voltage. For the treatment of phenol wastewater by three-dimension electrode Fenton reagent method, in a certain range of voltage with the hoist of voltage the impetus of electrochemical oxidation reaction enhancing and the removal rate of phenol heightening subsequently. In this experiment conditions, the appropriate electrolytic voltage is 12V. It is particularly important to selecting the reasonable electrolytic voltage for reducing energy consumption and improving the effect of organic matter degradation. With the increase of electrolytic voltage, the corresponding Faraday efficiency decrease. The process of phenol oxidative degradation follows first order reaction kinetic model in electrochemical reactor. The correlation relationship of electrolytic voltage and reaction kinetics constant k is k=0.0006674U^1.7784.

Abstract: The potential of Lythrum salicaria with root regulation to improve black-odors water quality in Wenzhou city was evaluated using a constructed ecological floating bed system. The roots of plants were regulated by three varieties of regulating materials which had same dimension but different pore sizes. The results showed that root regulation by materials with pores on the surface could enhance the growth of plants and create a favorable rhizosphere providing a large root surface-area for biofilm development. The material of smallest pore size had the best regulating effect. The floating beds planted with Lythrum salicaria at a static state all had a promising removal potential. Compared with plants without root regulation, the regulated plants achieved higher biomass yield, removal efficiencies and uptake of N and P. The results indicated that root regulation could promote the growth of plants and elevated the nutrient removal.

Abstract: With the continuous development of the economic economy, the demands for automobiles in Jilin province increase constantly. The carbon emission control of transportation department will become one of the key fields for greenhouse gas control in Jilin province. This paper employs the LEAP Model, through setting Baseline scenario and Low-carbon scenario, to imitate the long-term energy demand and carbon emission of urban passenger transport in Jilin province. Then after the comparative analysis, this paper investigates the major impact elements and feasible paths for Jilin’s transportation industry carbon emission.

Abstract: A type of HG-1025/18.64-L.PM41 circulating fluidized bed boiler (CFB) has been put into production since 2009, a lot of significant experiences have been accumulated by the equipment improvement and operation exploration. To further understand the adjustment characteristics of flue gas temperature at furnace outlet, the operation data of 30 operating conditions have been measured, and also the method of regression analysis is applied to research and analyze the correlative factors composed of boiler load rate, ash content as received basis, volatile content as received basis, net calorific value as received basis, particle diameter of feeding coal, bed pressure, primary air ratio, upper secondary air ratio, lower secondary air ratio and oxygen content at furnace outlet.

Abstract: This paper discusses the hardware and software of polarization control system of the industrial circulating water. With the STM32 microprocessor produced by ST as its control core, this control system expands the display function of the zone LCD driving circuit which can realize field operation parameters, and designs the analogue acquisition circuit that can achieve the collection of circulating water polarization effect. The function of isolation output of the polarization energy can be achieved by the three-way PWM signal and the control signal produced by microprocessor, which can not only protect the output driver circuit effectively, but avoid the short circuit output. For the software design, the PID adjustment is adopted to realize the adjustment function of the output energy of PWM. The effect of energy saving and emission reduction of industrial circulating water can be attained in the later actual application.

Abstract: The Environmental factors cover a wide range of aspects but noise and emissions are the main regulatory issues which affect the design of the aircraft. Both are largely associated with engine design aspects and aircraft flight profiles. With the expected growth in air traffic at the major airports the environmental pressure groups will become more vocal. This paper shows the influence of airworthiness and environmental influences of aircraft. Both noise and emission pollution were discussed. Several methods were given to reduce these environment pollution on the base of the analysis.

Abstract: In air-separator’s operating condition, separation trajectory of air-separator’s internal garbage particles was obtained through comparison of ordinary and improved air-separator’s internal flow field in the numerical was simulated by FLUENT soft software and garbage particles’ flow rules and separation principle was revealed. The results show that velocity field and pressure field of improved horizontal air-separator’s changes smoothly and phenomenon of chaos and back-mixing can be avoided, furthermore, it realizes effective sorting for three different quality garbage particles. The numerical simulation method in this paper provides theoretical and technical way for optimizing the air-separator’s internal structure and improving air-separator’s performance.