Advanced Materials Research Vols. 610-613

Abstract: In this paper, feather was used to adsorb lead ions as a new type of adsorbent materials. For recycling feather, NaOH solutions as the desorption solutions were adopted to desorb feather after adsorption of lead ions, and then the factors which affect the desorption effect, such as desorption time, concentration of desorption solutions, temperature and so on were studied. It was found that the optimum desorption conditions are: the desorption time of 60min, the concentration of NaOH solutions of 30mmol/L, the temperature of 40°C.

Abstract: The simulated dye wastewater of direct fast scarlet was disposed of by the coagulant of FeSO₄. The effects of reaction time, the original pH value, coagulant dosages and temperature were discussed. The results showed that, at room temperature, the original pH was 7.9, the FeSO₄ dosage was 1.2 g / L, then after stirring for 15mins, the coagulation effect was the most obvious, and the removal rate of chroma achieved 95.3%.

Abstract: The paper presents that soil washing and bioremediation technologies were employed to treat the contaminated soil. Various works were conduced in parallel with each other and th results of the laboratouy studies were used to determine critical parameters. Four lixiviants, i.e. sulphuric acid, acetic acid, oxalic acid and ethylene diamine acetic acid were tests at three concentration levels respectively. The tests showed that the leaching of the heavy metals increases as the soil porosity increases. Silica sand was added to increase porosity of the contaminated soil. Hightest Mn removal was achieved mainly by sulphuric and oxalic acid at 0.001M at all soil samples. EDTA was significantly efficient in the removal of Ni and Zn. The recovery of heavy metals, particalarly Mn, decreased as the depth of samping increased. Heterogeneous bacteria and filamentous organism plate counts were conduced to evaluate the growth of the bacteria and filamentous organisms in the soil. The results from this study suggest that the leaching of heavy metals from the contaminated soil is to a large extent dependant on the pH of the leaching solution. By increasing the soil’s porosity and bioremediating the soil, higher extractions of metals were achieved.

Abstract: The principle for the reduction of excess sludge by the ozone in the sewage treatment plants (STPs) was introduced and the change of characteristics of the ozonated sludge was analyzed in this paper. Furthermore, the effects of ozonation of activated sludge on the biotical treatment process in the STP were summarized. At last, the applications of this kind of technology in the worldwide range were enumerated and some further research directions were suggested.

Abstract: Waste activated sludge is always used to product methane by two phases anaerobic digestion, but fermenting to accumulate VFAs has seldom reported. This paper deals with the effects of pH value, adding ratio and hydraulic retention time (HRT) on WAS acidification during mesophilic phase in two phases anaerobic digestion (TPAD) system through batch experiments. In order to gain the most amount of VFAs for providing more carbon source, the optimal conditions for WAS mesophilic anaerobic digestion observed in this study are pH=7, adding ratio=12.5%, HRT=4d and TC/TNb value=1.7~2.0. Finally, we analyzed acid production kinetic under the optimal conditions. It can be inferred that the performance of WAS acidification is sensitive to operating conditions.

Abstract: In this paper a new technology for comprehensive utilization of arsenic in high-arsenic copper sulfide concentrate has been studied out. Firstly,the concentrate was bioleached by moderate thermophile Sulfobacillus thermosulfidooxidans, under the suitable leaching conditions, the experiments results show that the concentrate is bioleached 82% of Cu,78% of As and 40% of Fe. Secondly, removal of Fe3+ by solvent extraction with P204 from bacterial leaching solution are presented, and Fe3+ is extracted up to 93％, and the content of Fe3+ in raffinate is under 9 mg/L. The comprehensive utilizations of most of arsenic from leaching liquor after removal Fe3+ has been carried out. When the temperature is 80 to 90°C, pH at 4.0~5.0 and ammonia as a neutralizer, the results of XRD analysis show that the forming process of copper arsenate is complicated, and the formed molecular formulas are in different types, and they are CuAs2O4, Cu5As2O10•5H2O, C4H6As6Cu4O16, Cu5As4O15•9H2O and Cu2AsO4OH•3H2O. The comprehensive utilizations of most of arsenic are in the form of copper arsenate, and the content of arsenic is 9.11~35.82mg/L in solution after its precipitated. This study provides a new treatments and process for the utilization of arsenic in the high-arsenic copper sulfide concentrate.

Abstract: Abandoned infrastructure presents a series of problems such as safety problems, destruction of urban landscape, and occupation of urban land resources, thus they need to be demolished or reconstructed. The key to organic regeneration of abandoned infrastructure in cities is sustaining the ecological environment, spatial environment and cultural environment they lie in, and combining with the sustainable development of the city after the reconstruction. Based on some typical international cases, this paper proposes three strategies in the regeneration of the abandoned infrastructure, including complete demolishment, necessary reconstruction and diverse development. Combined with “The Big Dig” project in Boston,the study has shown that it updates open space of cities,boots economic development and carries on organic regeneration of the abandoned infrastructure through the landacape intervention.

Abstract: The different refining processes of lime mud, including water washing, drying and adding auxiliaries from chemical recovery of black liquor from reed pulp mill were studied in the article. The convenient and effective technologies of refining lime mud for CaCO₃ used as papermaking fillers with less water consumption were optimized and discussed. The experimental results showed that the brightness of the CaCO₃ refined is 84~86%(ISO), and water consumption is about 30~50 ton for one ton’s lime mud by the washing processes, and the brightness of the CaCO₃ refined is 88~89%(ISO) by the drying processes, and the lowest water consumption is about 3~6 tons for one ton’s lime mud by the adding auxiliaries peocess. With the optimum process, the carbonizing temperature is about 50°C, and the brightness of CaCO₃ refined is 91.5%(ISO). Total water consumption in the processes is only about 5~10 tons for one ton lime mud.

Abstract: BP algorithm was used to forecast the mine water quantity of Qiupigou coal mine as instance. The influencing factors for the mine water quantity were analyzed first. Based on the historical data, mining age, mining depth, rainfall of the year and rainfall in the last year affected the mine water quantity of Qipigou. The network model of mine water including three layers was established. Input layer includes four neurons, middle layer is six and output layer is one. The network model is trained by historical data from 1988 to 2007. The training make the network model get acquainted the realistic relationship between the influencing factors and mine water quantity. The forecast results show that the error of the network is under 8%, the minimum value of mine water quantities from 2011 to 2025 in Qiupigou mine is 704m3/h and the maximum value is 860m³/h.

Abstract: The flow model was improved on, and the two kinds of circumstances were discussed. When the current flow point is on the borders, the flow direction is remained if the water doesn’t flow along the borders. When the current flow point is not next to the blank spots in two adjacent directions, the flow direction is remained. And then, I designed the algorithm of the follow-up processing steps to extract drainage-basin, such as process depression, the determination of river, river classification, partition side-area, search drainage- basin border, smooth river and smooth drainage-basin border. Finally, I solved the problems about the around-flows and the cross-flows. The input data contains the terrain elevation of the grid data, and the output data is MAPGIS open data.