Advanced Materials Research Vols. 233-235

Abstract: The paper is focused on clarifying the influence of flue gas desulfurization (FGD) gypsum in replacing natural gypsum (NG) in the production of ordinary Portland cement (OPC). FGD gypsum was taken from Yi Yang power plant in Hunan, China. OPC clinker blends with 1–7 % of FGD gypsum to produce the binder of clinker/FGD gypsum. The properties of FGD gypsum was investigated via Chemical analysis, X-ray Diffraction (XRD), and differential thermal analysis (DTA)/thermogravimetric (TG) to evaluate the properties of binder. In present experiment, conduction calorimetry was applied to investigate the early hydration of binders. It was concluded that the blending of FGD gypsum reduced early hydration exothermic peak value of clinker and delayed the appearing time of exothermic peak at 30, and finally the early hydration of clinker was delayed effectively. This FGD gypsum is suitable as cement set retarders.

Abstract: A kind of manganese oxide which could purify seawater arisesed at the historic moment. Lithium manganese oxide was synthesized by coprecipitation method and the manganese oxide was prepared by extracting lithium from lithium manganese oxide. The characteristics of the manganese oxide were studied by X-ray diffraction and transmission electron microscopy. The characteristics showed that the manganese oxide was pure spinel structure and about 100 nm in length. There were experiments to study the effects of oil and phenol removal in the seawater. At the same time recycling lithium from seawater was tested. The results showed that the manganese oxide could not only remove oil and phenol but also recycle lithium.

Abstract: To alleviate the membrane fouling in membrane bioreactor, a kind of modified diatomite was used as anti-fouling agent to examine the effect on sludge properties in submerged membrane bioreactor for synthetic domestic wastewater treatment. Three submerged membrane bioreactor setups were operated under fixed membrane flux 21.9m³/m²·h, meanwhile, modified diatomite was added into each membrane bioreactor with dosage of 0mg/L, 1000mg/L and 2000mg/L respectively. Sludge particle size, extracellular polymeric substances and molecular weight distribution were characterized as the activated sludge properties in this study. The experiment results showed that with the increase of modified diatomite dosage, the number of sludge particle size less than 10μm was declined, however, the number between 10–20μm was increased correspondingly. Total extracellular polymeric substances and big molecular weight substances were decreased remarkably with modified diatomite addition dosage of 1000mg/L. The results indicated that addition of modified diatomite could effect of sludge properties in submerged membrane bioreactor. Therefore, membrane filtration performance could be improved by modified diatomite adding which alleviate membrane fouling directly.

Abstract: Carbonthermic method was adopted to reduce the iron in the form of fayalite in copper slag to metal iron in this study. The reduction was undertaken under the conditions of roasting reduction at 1423 K for 4 h with specified parameters that the ratio of copper slag versus anthracite was 2∶1, and that the ratio of calcium carbonate to silicon dioxide was 1.43∶1. It was demonstrated that the metallization efficiency of iron could reach 88.26%. Moreover it was showed that the reduction process of fayalite by carbon could be routed as: Fe₂SiO₄(or 2FeO·SiO₂)→ FeO + 2CaO·SiO₂→ Fe. In addition it was proved that the combination ability between calcium positive ion and silicon oxygen anion was bigger than that between iron positive ion and silicon oxygen anion. As a result，SiO₂ compacted in fayalite could decompose easily and could combine with CaO at the reaction temperature, therefore FeO could exist with a form of freedom state which could be reduce easily by carbon or monocarbon produced in carbonthermic method.

Abstract: Add different concentrations of honey into the simulated brine, then study the corrosion of Q235 steel and the corrosion inhibition effect of honey in different concentrations and temperatures with the method of losing weight. Results show that honey is a good inhibitor.

Abstract: According to the previous experience on remediation experiment in laboratory and field, the study on microgial ecological remediation of petroleum contaminated soil in Puyang oilfield was carried out under 3 different conditions. Here the results from remediation show that the technology of microbe cooperated with alfalfa, single microbe technology and single alfalfa technology all possess remedial effect on petroleum contaminated soil through 99-day period remediation, and the technology of microbe cooperated with alfalfa creates the best remedial mission with petroleum hydrocarbon degradation rate of 65.27%, while the rest single technologies exerts degradation rate of about 40% on petroleum hydrocarbon, Moreover, the experiment results indicate that few nutriment such as soluble salt, NO₃^-, Cl^-,etc can infiltrate into the lower soil layer(50cm). However, the distinct increase of NH₄⁺ in the second and third remediation area may attribute to abundance fertilizer transportation into depth soil layer due to the nitrogen fixation of alfalfa’s roots. In addition, we also find that the remediation effect can be impacted by the factors containing tempertation, water, oxygen, nutriment and mini-geo-enviroment.

Abstract: The adsorption of vitamin B₃ (VPP) by activated carbons and their release processes in the distilled water, simulated gastric fluid and simulated intestinal fluid were investigated. The adsorptive capacity of the activated carbon for VPP was 94.91 mg/g. Simulated gastric fluid could promote the release of VPP adsorbed by the activated carbon, and the cumulative percentage of VPP released was 76.36%. Based on three commonly-used kinetic models for drug release, mathematical simulations were carried out. It was found that the release processes of VPP in three different media could be fitted well by the Higuchi model Q = kt^1/2 + C.

Abstract: The numerical simulation of the fluid flow is presented by CFD technique to characterize the flow pattern of cyclone spray scrubber. In this process, the Reynolds-averaged Navier-Stokes equations with the Reynolds stress turbulence model (RSM) for fluid flow are solved by use of the finite volume method based on the SIMPLE pressure correction algorithm in the fluid computational domain. According to the computational results, the tangential velocity, axial velocity and turbulence intensity of the gas flow are addressed in the different flowrate. The results indicate that the CFD method can effectively reveal the mechanism of gas flow in the cyclone spray scrubber.

Abstract: In this study, Copper (Cu) tolerance in Chlorophytum comosum was tested by pot-planting. The results showed that the tolerance index (TI) of C. comosum was above 100 in soil Cu concentration of 50mg·kg^-1. With the increase of Cu concentration in soil, the MDA content increased, but had no significant differences with the control until 500mg·kg^-1. The value of chlorophyll a/b had no significant differences with the control in all treatments. Meanwhile, the bioaccumulation coefficient (BC) and translocation factor (TF) value of C. comosum were 1.287 and 0.687 respectively in Cu concentration of soil up to 500mg·kg^-1. For the advantages of high tolerance, high accumulation and high ornamental value, C. comosum may be a potential Cu-accumulator and have tremendous application value in the treatment of Cu-contaminated soils.

Abstract: The lacasse was immobilized by sodium alginate for papermaking wastewater treatment. The influence of the important factors on the treatment effect was studied by single factor test; and the optimized condition of immobilized lacasse treating papermaking wastewater was investigated by orthogonal test. The result shows that the optimum conditions are pH4, reaction time is 24h, shaker rotation speed is 160r/min, and reaction temperature is 40°C. The decoloring rate reach 73.3%, the COD removing rate is more than67.2%, the average COD_Cr and chroma of the treated water respectively are 98.3mg/L and 45.4times, The quality of the final water not only can completely satisfies the new discharge standard, but also the recycle requirements.