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Li J.,University of Science and Technology Beijing | Tang X.,University of Science and Technology Beijing | Tang X.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | Yi H.,University of Science and Technology Beijing | And 7 more authors.
Applied Surface Science | Year: 2017

Different copper-precursors were used to prepare Cu/graphene catalysts by an impregnation method. XRD, Raman spectra, TEM, BET, XPS, H2-TPR, NH3-TPD, DRIFTS and catalytic activity test were used to characterize and study the effect of precursors on the catalytic activity of Cu/graphene catalysts for NH3-SCO reaction. The large specific surface area of Cu/graphene catalysts and high dispersion of the metal particles on the graphene caused the well catalytic activity of NH3-SCO reaction. Compared to Cu/GE(AC), Cu/GE(N) showed better catalytic performance, and the complete NH3 removal efficiency was obtained at 250 °C with N2 selectivity of 85%. The copper-precursors had influence on the distribution of surface Cu species and further affected the catalytic activity of Cu/GE catalysts. The more amount of surface Cu species and highly dispersed CuO particles on the graphene surface formed by using copper nitrate as precursor could significantly improve the reducibility of catalysts and enhance NH3 adsorption, thereby improving the catalytic activity of Cu/graphene catalyst. © 2017


Zhang L.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | Zhang L.,University of Science and Technology Beijing | Qi H.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | Qi H.,University of Science and Technology Beijing | And 6 more authors.
Ultrasonics Sonochemistry | Year: 2017

The present study evaluated inactivation efficiency of a sonophotocatalytic process using ZnO nanofluids including ultrasonic parameters such as power density, frequency and time. The result showed that inactivation efficiency was increased by 20% when ultrasonic irradiation was combined with photocatalytic process in the presence of natural light. Comparison of inactivation efficiency in photocatalytic, ultrasonic and sonocatalytic processes using Escherichia coli as a model bacteria identified that inactivation efficiencies are shown in the following order: ultrasonic irradiation < sonocatalysis < photocatalysis < sonophotocatalysis. Furthermore, inactivation mechanism of sonophotocatalysis was proposed. Studies of reactive oxygen species (ROS) and zinc ions (Zn2+) release evaluation revealed that ROS play a key role in bacterial inactivation rather than Zn2+. Permeability of outer membrane (OM) and inner membrane (IM) of E. coli bacterial cells were studied and exhibited that sonophotocatalysis increased the permeability of OM and IM significantly. The enhanced bacterial inactivation effect in sonophotocatalytic process contributed to acoustic cavitation, sonocatalysis of ZnO and sonoporation phenomenon. © 2016 Elsevier B.V.


Du K.,University of Science and Technology Beijing | Du K.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | Zhou B.,University of Science and Technology Beijing | Zhou B.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | And 4 more authors.
Proceedings - 9th International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2017 | Year: 2017

A simple and sensitive technique, headspace solid-phase microextraction (HS-SPME) linked to gas chromatography-mass spectrometry (GC-MS), was developed for the determination of musty odor compounds, geosmin and 2-methylisoborneol. To obtain the highest sensitivity, several parameters of the extraction and desorption procedure were studied and optimized (such as extraction temperature, extraction time, ionic strength, sample volume, desorption temperature and desorption time). The optimum extraction conditions were as follows: extraction temperature 60°C, extraction time 50 min, ionic strength of 0.3 g mL-1 NaCl, sample volume 20 mL, desorption temperature 250°C, desorption time 5 min. The method showed a good linearity from 2 to 1000 ng L-1 with the coefficients of determination 0.999 for geosmin and 0.988 for 2-MIB. It provided detection limits of 0.67 ng L-1 of geosmin and 0.45 ng L-1 of 2-MIB. The relative standard deviations (R. S. D. S) were within 6.8% for geosmin and 4.4% for 2-MIB. Good recoveries were obtained for tap water (2-MIB 103%, GSM 98%) and lake water (2-MIB 94%, GSM 89%) spiked at 10 ng/L. The method is easily operational and suitable for the determination of musty odor compounds in water. Finally, the method was successfully applied to analyze musty odor compounds in tap water and lake water. © 2017 IEEE.


Luo H.,University of Science and Technology Beijing | Zhu L.,University of Science and Technology Beijing | Zhu L.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | Chang Y.,University of Science and Technology Beijing | And 7 more authors.
Bioresource Technology | Year: 2017

Cephalosporin C acylase (CCA), a proton-producing enzyme, was covalently bound on an epoxy-activated porous support. The microenvironmental pH change in immobilized CCA during the reaction was detected using pH-sensitive fluorescein labeling. The high catalytic velocity of the initial stage of conversion resulted in a sharp intraparticle pH gradient, which was likely the key factor relating to low operational stability. Accordingly, a novel strategy for a two-stage catalytic process was developed to reduce the reaction rate of stage I at a low temperature to preserve enzymatic activity and to shorten the duration of catalysis at a high reaction temperature in stage II. The reaction using the two-stage catalytic process (10–37 °C shift at 30 min) showed significantly improved stability compared with that of the single-temperature reaction at 37 °C (29 batches versus five batches, respectively) and a shorter catalytic period than the reaction at 10 °C (40 min versus 70 min, respectively). © 2016 Elsevier Ltd


Dong Y.-B.,University of Science and Technology Beijing | Dong Y.-B.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | Lin H.,University of Science and Technology Beijing | Lin H.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | And 2 more authors.
Gongcheng Kexue Xuebao/Chinese Journal of Engineering | Year: 2016

In order to study the ability of lees to adsorb heavy metals, this article was focused on the effects of wastewater pH values, Pb2+ and Zn2+ mass concentrations, and adsorption time on the adsorption quantity of Pb2+ and Zn2+ from simulated acid mine drainage using lees. Test results show that the maximum removal rate appears when the pH value is 4. The adsorption of Pb2+ by lees accords with the Langmuir equation, but the adsorption of Zn2+ is followed by the Freundlich equation. Under the optimal conditions, the maximum adsorption capacity of Pb2+ and Zn2+ by lees is 8.29 mg·g-1 and 15.31 mg·g-1, respectively. The adsorption process reaches equilibrium after 4 h, in agreement with the second-order kinetics model. The contents of cellulose, hemicelluloses and lignine in the lees is 23.3%, 65.5% and 0.5%, while become 19.6%, 42.3% and 2.6% after adsorption of Pb2+ and Zn2+, respectively. The electro-negativity of lees increases while the pH value raises, and it reduces after adsorption of Pb2+ and Zn2+. Fourier transform infrared spectra indicate that the main functional groups are amide and ester reacting in the adsorption process. © All right reserved.


Bai X.,University of Science and Technology Beijing | Bai X.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | Li Z.,University of Science and Technology Beijing | Li Z.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | And 2 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2015

Stripping combined with struvite precipitation (MAP) was used to treat the liquid digestate. The results showed that the best process parameters for stripping of the digestate from mesophilic digestion were as follows: the pH value was 10, stripping time was 8 h, gas-liquid ratio was 2 400, and filler was added. The removal rate of ammonia in the digestate was about 90%. The pH value of the digestate after stripping was about 9.2 and it was suitable for MAP precipitation method. The pH value regulation was not necessary, so it can save the cost of dosage. The removal rate of ammonia nitrogen and total phosphorus were 95% and 80%, respectively, after MAP precipitation treatment. The removal rates of COD and SS were 40% and 32%, respectively. The pH value of the effluent after MAP precipitation was about 8.3, which can meet the requirements of biochemical treatment. Meanwhile, C/N ratio of the effluent was greatly improved, which was increased from 0.7 to 10, and it was conducive to further treatment of the follow-up biochemical system. The process not only makes the digestate be processed, but also can recover the nutrients. © 2015, Chinese Society of Agricultural Machinery. All right reserved.


Ma H.,University of Science and Technology Beijing | Ma H.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | Yang J.,University of Science and Technology Beijing | Yang J.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | And 7 more authors.
Bioresource Technology | Year: 2016

Stillage reflux fermentation in food waste ethanol fermentation could reduce sewage discharge but exert a harmful effect because of side-product accumulation. In this study, regulation methods based on metabolic regulation and side-product alleviation were conducted. Result demonstrated that controlling the proper oxidation-reduction potential value (-150 mV to -250 mV) could reduce the harmful effect, improve ethanol yield by 21%, and reduce fermentation time by 20%. The methods of adding calcium carbonate to adjust the accumulated lactic acid showed that ethanol yield increased by 17.3%, and fermentation time decreased by 20%. The accumulated glyceal also shows that these two methods can reduce the harmful effect. Fermentation time lasted for seven times without effect, and metabolic regulation had a better effect than side-product regulation. © 2016 Elsevier Ltd.


Shi Y.-L.,University of Science and Technology Beijing | Shi Y.-L.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | Tong Z.-S.,University of Science and Technology Beijing | Tong Z.-S.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | And 2 more authors.
Kang T'ieh/Iron and Steel | Year: 2015

In order to find active reaction zone of dense flow absorber and the reason that why the distal end of bag-filter was not highly used, it was urgent to study the internal flow field distuibution and the change of pressure field. In this paper, the system of a dense flow absorber integrated bag-filter was simulated with Fluent software before and after improvement. The two-equation turbulence model and discrete phase model(DPM) were used to simulate the gas phase flow and solid phase flow, respectively. Results of the simulation showed that changing the layout of outlets had much more positive effects on the homogeneous flow inside bag-filter than adding the baffle plate inside bag-filter. The empirical study also indicated that the most optimized design of the baffle plate inside the dense flow absorber was 7.5 m in length and 45 degree in angle. © 2015, Chinese Society for Metals. All right reserved.


Ma H.,University of Science and Technology Beijing | Ma H.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | Yang J.,University of Science and Technology Beijing | Yang J.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | And 6 more authors.
Bioresource Technology | Year: 2016

Raw materials and pollution control are key issues for the ethanol fermentation industry. To address these concerns, food waste was selected as fermentation substrate, and stillage reflux was carried out in this study. Reflux was used seven times during fermentation. Corresponding ethanol and reducing sugar were detected. Accumulation of by-products, such as organic acid, sodium chloride, and glycerol, was investigated. Lactic acid was observed to accumulate up to 120 g/L, and sodium chloride reached 0.14 mol/L. Other by-products did not accumulate. The first five cycles of reflux increased ethanol concentration, which prolonged fermentation time. Further increases in reflux time negatively influenced ethanol fermentation. Single-factor analysis with lactic acid and sodium chloride demonstrated that both factors affected ethanol fermentation, but lactic acid induced more effects. © 2016 Elsevier Ltd.


Du K.,University of Science and Technology Beijing | Du K.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | Liu J.,University of Science and Technology Beijing | Zhou B.,University of Science and Technology Beijing | And 3 more authors.
Environmental Engineering Research | Year: 2016

2-Methylisoborneol (2-MIB) is one of typical odorants in potable water sources, which is hardly removed by conventional water treatment process. In this study, three strains capable of removing 2-MIB singly from drinking water were isolated from activated carbon of sand filter. They were identified to be Shinella zoogloeoides, Bacillus idriensis and Chitinophagaceae bacterium based on 16S rRNA gene sequence analysis. In mineral salts medium without external carbon source, removal efficiencies of 20 μg/L 2-MIB in three days were 23.3%, 32.9% and 17.0% for Shinella zoogloeoides, Bacillus idriensis and Chitinophagaceae bacterium, respectively. The biodegradation of 2-MIB was significantly improved with the presence of cometabolism carbon(glycerol, glucose, etc.). In the period of 20 days, Bacillus idriensis can remove 2 mg/L MIB to 368.2 μg/L and 315.4 μg/L in mineral salts medium without and with glycerol respectively. The removal of 2-MIB by Bacillus idriensis was from 2 mg/L to 958.4 μg/L in Xiba river samples on 15 days. © 2016 Korean Society of Environmental Engineers.

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