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Zhang D.,Harbin Institute of Technology | Zhang D.,Heilongjiang East University | Li W.,Harbin Institute of Technology | Huang X.,Harbin Institute of Technology | And 2 more authors.
Bioresource Technology | Year: 2013

The strain SFA13, isolated from Songhua River, demonstrates ability to convert ammonium to nitrogen under aerobic conditions at low temperature. On the basis of 16S rRNA gene sequence, the strain SFA13 was a species in genera Microbacterium. The isolate showed unusual ability of autotrophic nitrification with the ratio of 0.11mg NH4 +-N/L/h at 5 ° C. Ammonium was consumed by the strain SFA13 with the biodegradation of organic carbon and without nitrite or nitrate accumulation. NO3 --N or NO2 --N was reduced by the strain SFA13. The denitrification ratio was 0.24mgNO3 --N/L/h. Hydroxylamine oxidase, nitrite reductase and nitrate reductase were detectable. The putative nitrogen removal process by the strain SFA13 was as follows: NH4 + → NH2OH → NO2 -→NO3 -, then NO3 -→NO2 -→N2. Biological activated carbon attached with the strain SFA13 could effectively remove ammonium in surface water with the rate of 2.68±0.27-3.16±0.25mgNH4 +-N/L/h at C/N 2-10, temperature 10°C, and DO>5.2mg/L. © 2013 Elsevier Ltd. Source


Li Y.,Harbin Institute of Technology | Li Y.,Heilongjiang East University | Wang M.,Harbin Institute of Technology | Zheng Z.,Harbin Institute of Technology
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2014

A strategy of frequency-dividing control based on PVPI(Proportional Vector PI) control is proposed to enhance the utilization rate of energy storage system and achieve its multi-objective control. The frequency selection characteristics of PVPI control are used to theoretically realize the zero steady-state error control of a special frequency component, by which, the energy storage system supplies power while compensates selectively the harmonic, unbalance and reactive currents, resulting in the improvement of microgrid power quality and the suppression of its impact on low-voltage distribution grid. Simulative results verify the validity of the proposed control strategy. Source


Wang X.,Harbin Institute of Technology | Wang X.,Heilongjiang East University | Yang Y.-L.,Harbin Institute of Technology | Wang P.,Harbin Institute of Technology | And 6 more authors.
Dalton Transactions | Year: 2012

Two lanthanide complexes, Ln(HPDA) 3·4EtOH (Ln = Tb, Dy) (H 2PDA = pyridine-2,6-dicarboxylic acid, EtOH = ethanol), have been successfully synthesized using hydrothermal or solvothermal methods, and their crystal structures were analyzed by single crystal XRD. Both crystals have orthorhombic symmetry with space group Pbcn, exhibiting three-dimensional (3D) supramolecular architecture through hydrogen bonding interactions. The metal center was coordinated to nine atoms by three pyridine-2,6-dicarboxylic acid ligands. The nine-coordinated lanthanide metal complexes were assembled onto a nanocrystalline TiO 2 film to form co-sensitized photoelectrodes with N719 for dye-sensitized solar cells, and their photoelectrochemical performance was studied. In the tandem structure of composite electrodes, the energy levels of lanthanide metal complexes are reorganized in their single-crystal form, as verified by ab initio calculations. The co-sensitized systems are far superior for electron-injection and hole-recovery compared with single N719-sensitized systems. Luminescence properties were measured and electrochemical analysis was also performed on these complexes. © 2012 The Royal Society of Chemistry. Source


Jie W.,Harbin Institute of Technology | Jie W.,Heilongjiang East University | Peng Y.,Harbin Institute of Technology | Peng Y.,Beijing University of Technology | And 2 more authors.
Bioresource Technology | Year: 2014

This study aimed at exploring the potential of volatile fatty acids (VFAs) produced from excess sludge (ES) as a new cost-effective internal carbon source in wastewater treatment processes. The optimal condition for VFA accumulation and the bacterial community structure in the bio-production of VFAs from ES were investigated at different pH conditions. Denaturing gradient gel electrophoresis (DGGE) was performed to characterize the bacterial community structure of ES. The results showed that the optimal pH was 10.0 for VFA production, and acetic and propionic acids were the dominant acid species. Pseudomonas sp. was identified as the major bacteria capable of utilizing organic carbon at all pHs. Uncultured bacterium (AB658278) adapted well at high pH. Uncultured bacteria (KC633537 and JN596370) were mainly responsible for anaerobic degradation of ES. The study demonstrated the variation of bacterial community structures at pHs and the close correlation with the VFA accumulation. © 2013 Elsevier Ltd. Source


Han J.,Heilongjiang University | Wang L.Y.,Heilongjiang University | Cai B.Y.,Heilongjiang University | Cai B.Y.,Heilongjiang East University
Water Science and Technology | Year: 2013

The bacterial diversity of an antibiotic industrial wastewater treatment system was analyzed to provide the information required for further optimization of this process and for identification of bacterial strains that perform improved degradation of antibiotic industrial wastewater. The total bacterial DNA of samples collected at three stages (aeration, precipitation, and idle) during the sequencing batch reactor (SBR) process were analyzed by polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) of the 16 s rDNA V3 regions. Community analysis was conducted in terms of the richness value (S), the dominance degree and the Shannon-Wiener diversity index (H). Rich bacterial diversity was apparent in the aeration stage of the SBR process, and the number of bands in the aeration stage was more abundant than that in the precipitation and idle stages. The DGGE analysis showed 15 bands, six of which were uncultured bacteria, and included one anaerobic and five aerobic bacteria. The microbial community in the aeration stage was the most complex of the whole SBR process, while the dominant bacteria differed in each reaction stage. These results demonstrate the cyclical dynamic changes in the bacterial population during the SBR process for the treatment of antibiotic industrial wastewater. © IWA Publishing 2013. Source

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