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Hou F.D.,China Machinery International Engineering Design and Research Institute Co. | Wang F.,Nanjing University of Science and Technology | Nie X.B.,Changsha University of Science and Technology
Applied Mechanics and Materials

Excessive propagation of Tubifex tubifex in eutrophic source water can result in the emergence of them in the drinking water plant, which has been a troublesome problem in recent years. Our objectives were to investigate the driving force of drift and quantify the influence of temperature and DO on the worm drift. Results showed that one of the major driving forces of the worm drift was water flow, which exhibited its effect by direct shear stress on the worm or inducing sediment suspension. The worm drift rates were increased with the decrease of temperature and DO content. The results confirmed that worm drift from sediment to overlying water, which was induced by water flow and could be influenced by temperature, DO content and sediment property was the main cause of worm pollution in drinking water plant. © (2014) Trans Tech Publications, Switzerland. Source

Zhao J.,China Machinery International Engineering Design and Research Institute Co. | Yao T.,Jiangsu Research Institute of Building Science
Journal of Hohai University

In order to effectively control the cost of pipe materials in engineering, the ring-bending stiffness of buried round plastic pipeline needs to be accurately determined. Comparison of the calculated value and engineering experience shows that the value deduced by the ring-bending stiffness of the anti-deformation limit is accurate. In the ring-bending stiffness calculation, parameter selection, especially the selection of the soil deformation modulus, had a significant effect on the calculation results. The calculated results show that to obtain accurate soil deformation modulus is vital to determination of the ring-bending stiffness. Source

Yang H.,Hunan University | Liu Z.-H.,Hunan University | Li X.-M.,Hunan University | Li X.-M.,Guangxi University | And 5 more authors.
Huanjing Kexue/Environmental Science

In this paper the feasibility of enhanced electricity generation of microbial fuel cell fed surplus sludge by additional enzymes (neutral protease and α-amylase) was discussed. The effect of dosage of additional enzyme on characteristics of electricity generation of the surplus sludge microbial fuel cell(SSMFC)and the reduction of surplus sludge were investigated. The results indicated that the maximum output power destiny of the group of experiment was higher than that of control under the same condition. Moreover, the maximum output power density, coulomb efficiency, efficiency of reducing TCOD, efficiency of reducing TSS and efficiency of reducing VSS reached up to 507 W·m-2(700 mW·m-2), 3.98%(5.11%), 88.31%(94.09%), 83.18%(98.02%) and 89.03%(98.80%) respectively for protease(α-amylase) at the dosage of 10 mg·g-1. This study demonstrated that additional enzyme greatly enhanced the electricity generation of MFC with simultaneous accomplishments of sludge treatment, providing a novel approach for the practical application of microbial fuel cell. Source

Wang J.J.,Shandong University | Tang Z.Z.,Staffordshire University | Gui Y.W.,China Machinery International Engineering Design and Research Institute Co. | Wu W.Y.,Staffordshire University | Zhao M.,Harbin Institute of Technology
Progress in Civil, Architectural and Hydraulic Engineering - Selected Papers of the 4th International Conference on Civil, Architectural and Hydraulic Engineering, ICCAHE 2015

In order to quickly locate the leakage in urban water distribution network, a model of pressure-dependent leakage detection is developed based on the principle that the leakage is positively correlated with the pressure. Particle Swarm Optimisation (PSO) is applied to solve the model, and the feasibility of pressure-dependent leakage detecting method is verified by using a test function. Finally, the model is applied in the water distribution network of City A to locate leakage. As a result, simulating leakage nodes are located within the range of 125 m to 467 m from actual leakage nodes, which indicates that the developed model can significantly improve the efficiency of leakage detection. © 2016 Taylor & Francis Group, London. Source

Su Y.-R.,Central South University | Su Y.-R.,China Machinery International Engineering Design and Research Institute Co. | Chai L.-Y.,Central South University | Yang Z.-H.,Central South University | And 2 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals

The pannonibacter phragmitetus T1 was used as bio-sorbent, the effects of the factors such as the metabolic activity of bacteria, culture time, pH value, biomass concentration, temperature, adsorption time and initial concentration of metal ions on the biosorption of Pb 2+ were determined, and the adsorption mechanism was further discussed. The results show that the maximum adsorption capacity of T1 for Pb 2+ reaches 68.35 mg/g under the optimal conditions as the Pb 2+ concentration of 150 mg/L, pH value of 6, the nonliving bacteria cultured after 12 h with the biomass of 0.5 g/L, and temperature of 30°C. The kinetic study of the adsorption shows that the adsorption process of Pb 2+ is rapid, and finishes in 90 min. The adsorption process is well accorded with the Pseudo-second order model and Langmuir model. The analysis of the FTIR spectrum indicates that the hydroxyl and amide are the main reactive groups on the surface adsorption. Source

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