Time filter

Source Type

Liu Z.,Harbin Institute of Technology | Cui F.,Harbin Institute of Technology | Ma H.,Harbin Institute of Technology | Fan Z.,Harbin Institute of Technology | And 7 more authors.
Chemosphere | Year: 2013

The potential water quality problems caused by the interaction between nitrobezene (NB) and Microcystis aeruginosa was investigated by studying the growth inhibition, the haloacetic acids formation potential (HAAFP) and the secretion of microcystin-LR (MC-LR). The results showed that NB can inhibit the growth of M. aeruginosa, and the value of EC50 increased with the increase of initial algal density. Although NB can hardly react with chlorine to form HAAs, the presence of NB can enhance the HAAFP productivity. The secretion of the intracellular MC-LR is constant under the steady experimental conditions. However, the presence of NB can reduce the MC-LR productivity of M. aeruginosa. Overall, the increased disinfection risk caused by the interaction has more important effect on the safety of drinking water quality than the benefit of the decreased MC-LR productivity, and should be serious considered when the water contained NB and M. aeruginosa is used as drinking water source. © 2013 Elsevier Ltd.

Liu Z.,Harbin Institute of Technology | Cui F.,Harbin Institute of Technology | Ma H.,Harbin Institute of Technology | Fan Z.,Harbin Institute of Technology | And 5 more authors.
Water Research | Year: 2012

The bio-reaction of nitrobenzene (NB) with Microcystis aeruginosa was investigated at different initial algal densities and NB concentrations by performing static experiments. The results showed that the elimination of NB was enhanced by the bio-reaction, and the reaction rate varied as a function of the reaction time. Moreover, the reaction rate was significantly affected by the algal density and NB concentration. A kinetic analysis showed that the elimination of NB in a solution without algae appeared to be pseudo-first-order with respect to the NB concentration, whereas a first-order model was too oversimplified to describe the elimination of NB in a solution with algae. Assuming that different algal cells have the same effect on the bio-reaction under the same conditions, the bio-reaction can be described as dC NB = -k 0C A mA NB ndt (where k 0 is the reaction rate constant, C A is the algae density and C NB is the concentration of NB). When the growth of algae was not considered, the value of k 0, m and n were 8.170 × 10 -4, 0.5887 and 1.692, respectively. Alternatively, when algae were in the exponential growth phase, the value of k 0, m and n were 1.6871 × 10 -5, 0.7248 and 2.5407, respectively, according to a nonlinear fitting analysis. The kinetic model was also used to elucidate the effect of nutritional limitation on the bio-reaction. © 2012 Elsevier Ltd.

Cheng Y.,Beijing Jiaotong University | Yu L.,Beijing Jiaotong University | Yu L.,Texas Southern University | Wang H.-T.,Changchun Institute of Urban Planning and Designing | And 3 more authors.
Jiaotong Yunshu Xitong Gongcheng Yu Xinxi/Journal of Transportation Systems Engineering and Information Technology | Year: 2011

In order to investigate macro-scale vehicle emission models suitable for China, this paper-systematic introduces the principles, characteristics and applications of the MOBILE and COPERT models at first, then describes the methods of data collecting and dealing of PEMS equipment, and finally modifies the models' input parameters based on the data collected by using PEMS equipment. The emission factors for different road types from the two models are compared with the measurements from real-world tests. The results show that, during the whole vehicle driving cycle and on all classified roads, the predicted emission factors of NOx, HC and CO from the COPERT Model are closer to the measured values than those from the MOBILE Model. Specifically the errors of the former are 19.2% , 40.8% and 22.0% less than the errors of the latter during the whole vehicle driving cycle. In the end, it comes into a conclusion that COPERT model is more suitable for predicting vehicle emission in China than MOBILE model.

Yin J.,Harbin Institute of Technology | Yin J.,Jilin Institute of Architecture and Civil Engineering | Wu L.,Harbin Institute of Technology | Liu Z.,Harbin Institute of Technology | And 3 more authors.
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2012

The organic constituents in reaction tanks of an organic solid waste treatment plant in Changchun, which disposal of fecal sewage by using humus activated sludge process, were detected and analyzed with the use process and dissolved oxygen (DO) affected the release matters of pellets. The results showed that, the mass fraction of organic matter in humic biological pellets, basically unchanged with its own consumption, maintained at the level of 308 g/kg throughout the process of using, humic acids, fulvic acid and humic acid maintained at 143 g/kg, 64 g/kg and 79 g/kg, respectively. More kinds of organic matters which containing hydroxy and carboxyl were released when concentration of DO was 0.5 mg/L, compared with 2.0 mg/L. Rising tendencies of the mass fraction of fulvic acid and proportion of humic acids, as well as higher mass fraction of fulvic acid than humic acid, were detected along the return and inner return direction of sludge of the plant.

Liu Z.,Harbin Institute of Technology | Liu Z.,National Cheng Kung University | Hou Z.,Harbin Institute of Technology | Hou Z.,Changchun Institute of Urban Planning and Designing | And 5 more authors.
Journal of Water Supply: Research and Technology - AQUA | Year: 2014

It is rarely reported that the interaction between xenobiotics and algae may cause potential water quality risks and affect the drinking water treatment process. In the present study, a bench-scale jar test was performed to investigate the effects of the interaction between nitrobenzene (NB) and Microcystis aeruginosa on the performance of coagulation-sedimentation by comparing differences in turbidity, optical density at 680 nm (OD 680), trihalomethane formation potential (THMFP) and microcystin-LR (MC-LR) in an M. aeruginosa solution with or without NB. The results indicated that the quality of M. aeruginosa-containing water can be improved significantly by coagulationsedimentation, and all of the removal rates were more than 80%. The presence of NB did not affect the performance of coagulation-sedimentation directly. However, the interaction between NB and M. aeruginosa did change the characteristics of the raw water and affect the performance of coagulation-sedimentation. At a non-lethal concentration, NB did not inhibit the growth of M. aeruginosa but weakened the zeta potential of M. aeruginosa, which enhanced the removal of turbidity. The products of NB degradation by M. aeruginosa cause an increased THMFP in extracellular organic matters, which cannot be removed by coagulation-sedimentation efficiently, increasing the risk of disinfection by-products formation in the following disinfection unit. © IWA Publishing 2014.

Wu L.,Harbin Institute of Technology | Wu L.,Jilin Institute of Architecture and Civil Engineering | Yin J.,Harbin Institute of Technology | Yin J.,Jilin Institute of Architecture and Civil Engineering | And 3 more authors.
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | Year: 2014

To thoroughly investigate biochemical characteristics of the humic activated sludge and action mechanism, the humic biological pellets were tested by means of SEM-EDAX. The results show that the main composition elements in humic biological pellets are C, O, Si, and there are small amounts of Al, S, Fe. Compared to conventional activated sludge, the number of typical bacteria, nitrifying bacteria, nitrosobacteria, denitrifier and actinomycetes in humic activated sludge were significantly higher. Organic matter content in humic activated sludge is less than that in conventional activated sludge, but the humic acids content is higher. The humification degree of humic activated sludge is considerably higher than that of conventional activated sludge. The SBR reactor operated under humic activated sludge process performed excellent pollutant removal efficiency than conventional SBR reactor, the removal efficiency of CODCr, TN and TP is 4%, 10% and 14% higher respectively.

Hu H.,CAS Changchun Northeast Institute of Geography and Agroecology | Hu H.,University of Chinese Academy of Sciences | Hu H.,Changchun Institute of Urban Planning and Designing
Advanced Materials Research | Year: 2013

Based on field investigation and social-economical data, in combination with the 1992 and 2007 Landsat TM remote sensing images of Coastal Urban Belt in Liaoning, this paper analyzed the dynamic changes of landscape pattern at both class and landscape levels and their driving forces in the study area. From 1992 to 2007, the landscape pattern in the study area experienced a significant change. At class level, the area of farmland, forestland, wetland, grassland, and abandoned land decreased, while the area of residential area, salt pan, and water area increased. At landscape level, both total number of patches and patch density increased significantly, while the largest patch index decreased, and the complication of landscape shape intensified. © (2013) Trans Tech Publications, Switzerland.

Loading Changchun Institute of Urban Planning and Designing collaborators
Loading Changchun Institute of Urban Planning and Designing collaborators