Yi Chengwu

Study on the Removal of SO2 from Simulated Flue Gas Using Dry Calcium-Spray with DBD Plasma

In this study, lime-hydrate (Ca(OH)2) desulfurizer was treated by plasma with strong ionization discharge of a dielectric barrier. The removal of SO2 from simulated flue gas was investigated. The principles of SO2 removal are discussed. Several factors affecting the efficiency of SO2 removal were studied. They included the ratio of calcium to sulfur (Ca/S), desulfurizer granularity, residence time of the flue gas, voltage applied to the discharge electrode in the plasma generator, and energy consumption. Experimental results indicate that the increase in Ca/S ratio, the applied voltage and discharge power, the residence time, and the reduction in the desulfurizer granularity all can raise the SO2 removal efficiency. The SO2 removal efficiency was up to 91.3% under the following conditions, namely a primary concentration of SO2 of 2262 × 10−6 (v/v) in the emission gas, 21%(v/v) of oxygen, 1.8% (v/v) of water, a Ca/S ratio of 1.48, a residence time of 2.8 s, a 3.4 kV voltage and a 10 kHz frequency power applied to the discharge electrodes in the plasma generator, and a flow rate of 100 m3/h for emission gas.

Notice of Retraction Study on ozonation of ammonium sulfite in aqueous solutions

Do an oxidation experiment by use the ozone technology on ammonium sulfite which is produced as a byproduct in the desulfurization by ammonia absorption process, researched the influences to the oxygenation efficiency of ammonium sulfite under different reaction temperature, aeration, oxidation time, pH value and the initial ammonium sulfite concentration, found out a method and oxidation condition with a higher efficiency than the traditional ammonium sulfite oxidation, made a further extend of the application of flue gas desulfurization of ammonia process.

Study on formaldehyde degradation using strong ionization discharge

Effects of formaldehyde degradation using strong ionization discharge were studied. A majority of gas molecules in the air such as O2 and H2O were ionized and maken into OH ·of high concentration using strong ionization discharge method to carry out formaldehyde removal experiment without catalyst and absorbent. Some factors such as exerted voltage, initial concentration, fume flow, which affect the formaldehyde removal efficiency were studied. The orthogonal test design method was applied to optimize the process conditions and the GC-MS method was used to analyse the organic components in the fume. The results indicated that as the exerted voltage increased the degradation efficiency (ŋ) increased. The fume flow played a most important role on the increasing of ŋ. With the fume flow decreased, probabilities of collision and reaction between formaldehyde and active molecules increased. The influence to degradation efficiency decreased in the order: fume flow > voltage > density. Under the optimized conditions, the initial density, exerted voltage and fume flow were 200mg/m3, 3.2kV and 0.2m3/h, respectively, ŋ reached 93.2%. During the process of formaldehyde degradation, theres no other organic gas produced, and ŋ could be higher than 90%.

Biosorption of Pb(II) from aqueous solution by biomass of Neosartorya hiratsukae(M7): Equilibrium and kinetic studies

The biosorption characteristics of Pb(II) from aqueous solution using freeze-dried biomass of Neosartorya hiratsukae(M7) were investigated as a funtion of pH, contact time and initial concentration. The optimal pH for adsorption of Pb(II) was determined bo be 6.0. The pseudo-second-order kinetic model was found to be well suited for the adsorption process. Langmuir model fitted the equilibrium data better than Freundlich isotherm. The maxium adsorption capacity of M7 according to Langmuir isotherm was 42.55mg g−1 at pH 6.0 and 30°C. FTIR analysis of M7 showed the possible functional groups of M7. Responsible for the lead biosorption were carboxylic, hydroxyl and amine groups etc. SEM analysis demonstrated the microporous structure of the biosorbent while EDX analysis confirmed the adsorption of Pb(II) on the biomass of M7.