Materials for Environmental Protection and Energy Application

Volumes 343-344

doi: 10.4028/

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Authors: Yi Hua Yuan, Xin Tong Xiao, Shui Chun Xia, Bin Hua Luo, Xiao Zhen Chen, Shi Bin Xia
Abstract: PCBs removal in the aged leachate by a new combination process, combined coagulation with a two-staged sequencing batch biofilm reactor with Luffa Sponges (LS) as the biomass carriers (LS-SBBR), was studied in this research. The results indicated that the removal rate of total PCBs in the aged leachate was 51.97%, and it was achieved mainly by the removal of trichlorobiphenyls, the PCBs contents in sludge in the two-staged LS-SBBR were consistent with the conclusion that the PCBs removal in liquid phase of the second LS-SBBR was higher than that of the first LS-SBBR.
Authors: Fa Ming Huang, Shui Chun Xia, Xin Tong Xiao, Bin Hua Luo, Shi Bin Xia, Wen Qi Gong
Abstract: Nowadays, the immobilization of At.t is a research potential. The immobilization of At.t on the sawdust filler was discussed in this paper. The experimental results indicated that sawdusts, as the immobilization fillers, can provide a stable living microenvironment for At.t showing the favorable bioactivity and strong acid-producing capacity. Also, under the optimal conditions with the inoculums concentration 12.5%, sulphur dosage 1% (w/v), dissolved oxygen (DO) in the bioreactor above 6 mg/l, the conductivity, pH, and H+ in the bioreactor were 45.2 ms/cm,0.964, and 0.109 mol/l,respectively. In the leaching ore experiment within 24 hours, bacteria effect of phosphorus removal was unconspicuous.
Authors: Fan Hu, Zu Xun Xu, Bing Hai Dong, Li Wan, Xiu Hua Zhang, Guo Tian Dai, Wen Zhou, Shi Min Wang
Abstract: The Polyaniline-poly(vinyl alcohol)-intercalated graphite oxide (GO) composites were synthesized through in-situ polymerization methods. The characterizations were illuminated by using X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry(CV) and thermal analysis(TGA), respectively. TGA shows that composites have stable thermal properties. CV curves show charge-transport processes within the film are diffusion-controlled. The new composites reveal the potential application in the future.
Authors: Bao Shan Yang, Hui Wang, Jun Li, Su Liu
Abstract: In order to produce high-quality chitin, the extraction of chitin from pupa of Dictyoploca japonica was studied by acid-alkali method. The extraction technique of chitin from the pupa was as the follows: Pupa skin were dipped in 4%HCl for 20h in 35°C , then in 6%NaOH for 4h in 85°C, followed by decoloring in 10% H2O2 for 0.5h under 85°C. Under this conditions, the produced chitin was white flaky solid with 6.5%-9.5% water content, 0.65%-0.97% ash content and 5.78%-6.67% nitrogen content, the productivity of the processing was 28%. Its quality indexes reached that of edible chitin.
Authors: Dong Hai Li, Zhao Wang, Zhen Yi Liang, Xiao Bo Yang, Jing Xu
Abstract: This study was designed to comparative evaluate the chemical composition of the essential oil from twig, leaf and root parts of Clerodendrum inerme(L.) Gaertn. GC-MS analyses of the oils revealed the presence of 8, 8 and 6 compounds in the essential oils obtained by hydrodistillation from different parts, respectively. Higher amounts of esters were found to compose a major chemotype in diverse parts of the plant. Dibutyl phthalate was the main component of all the essential oils attaining in average 34.22%, 59.28% and 44.27% and the other kind of esters accounted for 38.30%, 17.28% and 10.89% in the twig, leaf and root parts, respectively. In addition, some pharmaceutical components such as stigmasterol, linoleic acid and ferruginol were discovered. The study offers theoretic basis for utilization of the traditional folk herb C. inerme.
Authors: Xu Zeng, Shu Guang Zuo, Xu Dong Wu
Abstract: Considering the mechanism interaction between the tire tread and road surface, a dynamic model is established based on LuGre friction model in this paper. The parameter identification of wear coefficient in Archard model is proceeded by simulation in accordance with the experiment data in the correlative references based on the computational method of abrasion loss in Archard model. The results show that this model can fit the experiment data well, provide a theoretic instruction to fulfill the tire wear prediction and lay the foundation of further research in this field.
Authors: Ling Ling Qiao, Zhi Gang Tian
Abstract: Power control in large wind farm has a big impact on the Grid, especially in low connectivity ratio. Publish subscribe technology is asynchronous loosely coupled, and multi-to-multipoint communication as adapted for large distributed real-time control of network communications needs in the wind farm. This paper presents publish subscribe-based real-time power command-delivery method. It is well used to deliver the control of wind farm, reducing the time-delay in control loops. Simulation results show that the method further improves the quality of the power control of common coupling in large wind farms.
Authors: Peng Liu, Cai Qin Gu, Qing Zhu Zeng
Abstract: The interaction between glycerol and water molecules is very complex, which displays different plasticization properties. In this paper, it studied the influence of glycerol-water mixture with different glycerol ratio on the thermal and rheological properties of starch. In water-rich mixture (glycerol ratio is less than 50%), its plasticization effect is similar as water, but will be impaired with the increase of glycerol. In glycerol-rich mixture (glycerol ratio is more than 90%), its lubrication and plasticization effect is similar as glycerol, and since glycerol can abstract lipid and destroy amylose-lipid complex, the peak M2 disappeared in DSC curves. In transition mixture, the mutual interactions reach maximal and less active hydroxy left, so the plasticization effect is the weakest, which is reflected by the highest loading peak and phase transition peak in torque-time curve by rheometer.
Authors: Xiao Qi Liu, Yong Fang, Hao Jiang, Yun Xiao, Le Gui Li
Abstract: In this paper, based on the experiment on pure minerals, namely, galena, sphalerite and pyrite, it is concluded that the appropriate pH range for galena flotation is 8.5-10.5, that for sphalerite flotation is 7-10.5 and for pyrite is 2.5-6.5. For galena, sphalerite and pyrite, butyl xanthate has a better collecting performance than ammonium dibutyl dithiophosphate. Both Na2SO3 and ZnSO4 have a relatively weak inhibitory effect on galena. As for sphalerite, the mixing of Na2SO3 and ZnSO4 has a better inhibitory effect than when they are used alone, with the best inhibitory effect obtained when the proportion of Na2SO3 and ZnSO4 is 1:2 and their dosages are respectively 100mg/L and 200mg/L. In zinc flotation, CuSO4 demonstrates an apparent activating effect on the inhibited sphalerite with its appropriate dosage at 2*10 -4 mol/L. In actual separation and selection of ore, when the grades of lead, zinc and silver in cyanide tailings are respectively 2.41%, 3.77% and 272g/t, a fairly good index is obtained where the Pb concentrate is of a grade of 33.41% with its silver grade of 4051.57g/t and the grade of Zn concentrate is 59.67% with its silver grade of 798.08g/t.

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