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1. Compacted Sewage Sludge as a Barrier for Tailings: the Bacterial Community Structure Diversity in the Compacted Sludge | |||
ZHANG Qing,ZHANG Huyuan,WANG Jinfang | |||
Environmental Science and Techology 24 July 2015 | |||
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Abstract:Compacted sewage sludge barrier for tailings, known as reducing barrier, was innovatively double- functioned liner with its capsulation and elimination to Acid Mine Drainage (AMD) produced by tailings. The research had provided insights regarding the bacterial community structure diversity and dynamics over 75 days in the compacted sewage sludge specimens under 3 different seepage conditions (deionized water (DW), pH 2.1 sulfuric acid water (SA) and the synthetic AMD), by PCR-DGGE technique. The results indicated that at the start point (SP) of seepage, the 41st day (T1) of seepage or at the 75th day (T2) of seepage, under different seepage conditions (DW, SA and AMD), Clostridiales ,Bacillaceae and Carnobacteriaceae dominated in the compacted sewage sludge specimen with different relative abundance ranged from 46.26 % to 10.25 %. Redundancy analysis (RDA) on the influences between environmental factors (pH and heavy metals potential mobility in the compacted sludge specimens) and microbial community structure diversity showed the bacteria such as Carnobacteriaceae, Bacillaceae, Clostridiales Family XI. Incertae Sedis, Clostridiaceae, Lactobacillaceae, Peptoniphilaceae, Ruminococcaceae, Moraxellaceae, Caulobacteraceae, Corynebacteriaceae had positive relation to Zn potential mobility and pH; Carnobacteriaceae, Bacillaceae, Clostridiales Family XI. Incertae Sedis, Clostridiaceae, Micrococcineae, Moraxellaceae, uncertain family bacteria had positive relation with Fe potential mobility; Carnobacteriaceae, Clostridiaceae, Corynebacteriaceae had positive relation to Cd and Ni potential mobility; Ruminococcaceae had positive relation to Cu potential mobility. | |||
TO cite this article:ZHANG Qing,ZHANG Huyuan,WANG Jinfang. Compacted Sewage Sludge as a Barrier for Tailings: the Bacterial Community Structure Diversity in the Compacted Sludge[OL].[24 July 2015] http://en.paper.edu.cn/en_releasepaper/content/4650839 |
2. Compacted Sewage Sludge as a Barrier for Tailings: the Microbial Functional Diversity in the Compacted Sludge Specimen | |||
ZHANG Qing,ZHANG Huyuan,WANG Jinfang,SUN Xun,YANG Bo | |||
Environmental Science and Techology 13 January 2015 | |||
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Abstract:he reducing barrier, using the compacted sewage sludge to be the liner for the tailings, made the liner have both encapsulating and eliminating functions. The microbial functional diversity ,heavy metal concentration, sulfate reducing bacteria (SRB) and total bacteria (TB) quantity in the compacted sludge with different seepage conditions (the deionized water(DW), the pH2.1 sulfuric acid and the simulate acid mine drainage(AMD)) were studied using Biolog and the Most Probable Number technique(MPN) testing system. The results showed that the average well color development (AWCD), the Shannon index (H), the Evenness index (E), the number of positive Ecoplate wells (S), the total bacteria (TB), and the sulfate reducing bacteria (SRB) quantity differed between different seepage conditions. There was no correlation between SRB quantity, Total bacteria quantity (TB) and the microbial community level functional diversity data. There was correlation between Cu concentration and Fe, Ni, Zn; between Fe and Ni. However, there was no correlation between Cd and other heavy metals. There was highly negative correlation between Cu, Fe, Ni concentration and the microbial community level functional diversity data. SRB quantity had correlation with Cd and Cu concentration. And TB quantity had correlation with Cu, Fe and Zn concentration. | |||
TO cite this article:ZHANG Qing,ZHANG Huyuan,WANG Jinfang, et al. Compacted Sewage Sludge as a Barrier for Tailings: the Microbial Functional Diversity in the Compacted Sludge Specimen[OL].[13 January 2015] http://en.paper.edu.cn/en_releasepaper/content/4626349 |
3. Influence of different surface modification treatments on biomass based carbons and their effects on adsorption of carbon dioxide | |||
Tao Zhiwei,Song Min ,Wu Jian,Chen Yuxia ,Chen Sheng ,Yang Keyun | |||
Environmental Science and Techology 20 March 2013 | |||
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Abstract:Surface modification of biomass based carbon with nitrogen containing functional groups is performed using the different modification method, including the thermal and chemical methods. We also investigate the effect of the different reaction parameters on their pore structure using the Brunauer-Emmett-Teller (BET) surface area and adsorption performance based on methylene blue (MB) value. Fourier transforms infrared spectroscopy (FT-IR) methods are performed to confirm the presence of N-containing groups. Based on above results, the comparison effect of different modification methods on physico-chemical propriety and adsorption properties of biomass based carbon materials are carried out. In conclusion, all modification methods could enhance CO2 adsorption capability. However, the carbon materials treated with ammonia using thermal method show the best performance. | |||
TO cite this article:Tao Zhiwei,Song Min ,Wu Jian, et al. Influence of different surface modification treatments on biomass based carbons and their effects on adsorption of carbon dioxide[OL].[20 March 2013] http://en.paper.edu.cn/en_releasepaper/content/4531603 |
4. Monitoring System for Recovering Waste Printed Circuit Boards | |||
LI Jia,ZHOU Quan,XU Zhenming | |||
Environmental Science and Techology 08 January 2013 | |||
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Abstract:(Although the corona electrostatic separation is successfully used in recycling waste printed circuit boards in industrial applications in China, there are problems which can't be resolved completely, such as nonmetal particle aggregation and high-voltage breakdown. Both of these impact the process of separation and are not easy to identify during industrial application. This paper provides a systematic study on a real-time monitoring system. A real-time weight monitoring system was established to continuously monitor the separation process. The monitoring system comprised of two parts: hardware and software. A Virtual Instrument (VI) program written by LabVIEW was used to sample and analyze the incremental accumulation of middling. It included:1) A Real-time monitoring system for the output of corona electrostatic separation (CES); 2) Real-time display of the weight accumulation of middling, the automatic determination to ensure middling stay within the limits ; 3) History date saving to file, which can be used by other software; 4) Statistic analysis and control for the incremental accumulation of middling. Three kinds of work conditions were used to verify the monitoring system. It was found that the system achieved continuous monitoring during the separation process and analyzed the received data. The system also gave comprehensible feedback for the accidents (material blockage in the feed inlet and high-voltage breakdown). The alarm signals not only helped operators to solve the problems in time, but provided input signals for improving the intelligence of the automatic line. From the alarm system, the monitoring system also saved human cost and helped the new technology to replace primordial methods as quickly as possible. | |||
TO cite this article:LI Jia,ZHOU Quan,XU Zhenming. Monitoring System for Recovering Waste Printed Circuit Boards[OL].[ 8 January 2013] http://en.paper.edu.cn/en_releasepaper/content/4508823 |
5. Comprehensive application and potential prediction for bathing water recycling in buildings | |||
Liu Meng,Li Yongqiang,Yang Xincheng | |||
Environmental Science and Techology 15 October 2012 | |||
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Abstract:Due to global climate change and resource shortage, energy efficiency and resource recycling received extensive attention. China has pushed forward the development of green building as national development strategy. Bathing water consumes both water and energy a lot. Varieties of studies have been carried out on the recycling of waste bathing water leading to numbers of technologies and theoretical researches. But current studies are restricted to the transformation of independent bath units, lacking of recycling on overall structure of the buildings and the analysis on inherent potential. This paper takes both energy and water reuse into consideration, providing a comprehensive application by the settlement using the waste water from bath for greening irrigation and warming-up the inlet bathing water. Predictions are made on energy saving efficiency in different seasons (26.1%, 29.2%, 28.6%) and irrigation ability per capita (97m2) of the comprehensive application. | |||
TO cite this article:Liu Meng,Li Yongqiang,Yang Xincheng. Comprehensive application and potential prediction for bathing water recycling in buildings[OL].[15 October 2012] http://en.paper.edu.cn/en_releasepaper/content/4488331 |
6. Direct reduction of copper oxide into copper under hydrothermal conditions | |||
Yao Guodong,Huo Zhibao,Cao Jianglin,Jin Fangming | |||
Environmental Science and Techology 11 January 2011 | |||
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Abstract:A new preparation method of Cu from CuO under hydrothermal conditions was investigated. Glucose was employed as reducing agent. Results showed that CuO can be reduced easily into Cuo with glucose as reductant at 220 to 250 C with NaOH. The reaction conditions such as reaction time, reaction temperature, sodium hydroxide concentration and water filling played key roles in purity of the products. The proposed method provides an efficient and green conversion of CuO into Cuo without expensive and toxic reducing agent at low temperatures. | |||
TO cite this article:Yao Guodong,Huo Zhibao,Cao Jianglin, et al. Direct reduction of copper oxide into copper under hydrothermal conditions[OL].[11 January 2011] http://en.paper.edu.cn/en_releasepaper/content/4405839 |
7. Production of acetic acid from lignin model compound by hydrothermal process | |||
ZEN Xu,CAO Jianglin,JIN Fangming,HUO Zhibao | |||
Environmental Science and Techology 09 January 2011 | |||
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Abstract:In this paper, the production of acetic acid from guaiacol, an important lignin model compound, under hydrothermal conditions was examined Hydrothermal experiments were conducted at different temperatures for different reaction times with different additive ratios of H2O2. The results show that a considerable amount of acetic acid can be produced in hydrothermal oxidations of guaiacol. The highest yield of acetic acid is about 10% at 300 C for 60 s with the additive ratio of H2O2 80%. Surplus addition of oxygen will accelerate the oxidation of acetic acid. The method should be expected to become a promising technology for reutilizing paper mill wastewater. | |||
TO cite this article:ZEN Xu,CAO Jianglin,JIN Fangming, et al. Production of acetic acid from lignin model compound by hydrothermal process[OL].[ 9 January 2011] http://en.paper.edu.cn/en_releasepaper/content/4405320 |
8. Production of Formic and Acetic Acids from Phenol by Hydrothermal Oxidation | |||
LU Man,ZEN Xu,CAO Jianglin,HUO Zhibao,JIN Fangming | |||
Environmental Science and Techology 07 January 2011 | |||
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Abstract:Hydrothermal technology is a core environmental protection technique, which can be used in the waste water treatments and biomass conversion. In this paper, a novel idea is proposed to produce formic and acetic acids from wastewater containing phenolic compounds by alkali hydrothermal oxidations. The effects of major parameters on the yields of formic acid and acetic acid, including reaction temperature, reaction time, oxygen supply and types of alkali catalysts, were investigated. The results indicated that the optimum conditions for the production of formic and acetic acids were as follows: reaction temperature of 300 C, reaction time of 90 s, H2O2 supply of 60% and NaOH concentration of 1.5 mmoL. In the optimum condition the yields of formic acid and acetic acid reached 4.8% and 23.5%, respectively. In addition, the effect of different alkalis on the yields of formic and acetic acids was also investigated. The results showed that compared with the addition of NaOH, the addition of KOH showed a more pronounced effect on improving the yield of acetic acid. This research indicated that high value-added formic and acetic acids can be recovered as resources through hydrothermal oxidation of phenolic wastewater, and thus hydrothermal oxidation has a high potential for converting phenolic compounds in wastewater into value-added products. | |||
TO cite this article:LU Man,ZEN Xu,CAO Jianglin, et al. Production of Formic and Acetic Acids from Phenol by Hydrothermal Oxidation[J]. |
9. Hydrolysis of pretreated rice straw with surfactants at low cellulase dosage | |||
Yuan Xingzhong ,Liang Yunshan ,Zeng Guangming ,Wang Weiwei | |||
Environmental Science and Techology 26 January 2010 | |||
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Abstract:The effects of three surfactants (Tween 80, saponin and monorhamnolipid) on the hydrolysis of NaOH-pretreated rice straw by low dosage of cellulase were studied. The results indicated that with a relatively low cellulase dosage (4 FPU g-1 substrate), all surfactants were able to enhance the enzymatic hydrolysis, while the biosurfactant monorhamnolipid was demonstrated to be more active than Tween 80 and saponin. Monorhamnolipid at 0.006% increased reducing sugar yield by 23.15%, and the maximal sugar yield was obtained within half of the time compare to the control required. The cellulase losed 67% of its activity in the control, while the activity lost ratios were 31%~43% in the presence of the surfactants. The surfactants addition did not affect the pH of the hydrolysis system. This study provides an opportunity of decreasing enzyme dosage in hydrolysis of agricultural solid waste rich in cellulose. | |||
TO cite this article:Yuan Xingzhong ,Liang Yunshan ,Zeng Guangming , et al. Hydrolysis of pretreated rice straw with surfactants at low cellulase dosage[OL].[26 January 2010] http://en.paper.edu.cn/en_releasepaper/content/39426 |
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