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Liu C.,Shanxi University | Yang Y.,Shanxi University | Wan N.,Jinan Municipal Engineering Design and Research Institute
Water Quality Research Journal of Canada | Year: 2014

Adsorption of phosphate onto construction solid waste (CSW) was investigated in a batch system. CSW as an inescapable by-product of the construction and demolition process, was used as a composite adsorbent for the removal of phosphate in this study. The adsorption kinetics was investigated under various parameters such as contact time, pH, CSW dosage, initial phosphate concentration and particle size. Greater percentage of phosphate was removed with decrease in the initial concentration and increase in the amount of CSW used. Adsorption of phosphate was pH dependent, and maximum phosphate immobilisation capacity was obtained in alkaline condition. Lagergren first-order, second-order, intra-particle diffusion and external diffusion model were used to test the experimental data. Kinetic analysis showed that the adsorption was best fitted with the pseudo-second-order kinetic model. Adsorption mechanism studies revealed that both external mass transfer and intra-particle diffusion had rate limiting effects on the removal process. These results demonstrated that the CSW could be used as a low-cost adsorbent media for phosphate removal, and the data were relevant for optimal design of wastewater treatment plants. © IWA Publishing 2014. Source

Liu Y.,University of Jinan | Liu J.-Y.,University of Jinan | Wang H.-P.,Jinan Municipal Engineering Design and Research Institute
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

From the theory of cooperative deformation of diagonal bracing systems, according to the minimum potential result, a new method of ″removing first and supporting then″ in every sub region and sections is introduced, and the calculation method of the length of sub region is derived. Finally, the feasibility and rationality of the proposed method is proved by the practical engineering. Henceforth, the conclusions can provide references of design and construction for the similar projects. Source

Wang H.-P.,Jinan Municipal Engineering Design and Research Institute | Liu Y.,University of Jinan | Liu T.,Ocean University of China
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

Cut-and-cover excavation is used properly in the design of subway station, which can display some advantages. The open-cut method is of fast construction and guaranteed construction quality, and the subsurface excavation has little influence on the ground traffic and underground pipeline and has low cost when constructed in deep rock region. The characteristics of subway station design excavated by cut-and-cover excavation combined method in rock region is studied based on the design of subway station in Qingdao. Asymmetric steel-pipe pile + bolt, shotcrete and anchoring supporting system are introduced in the open surface excavated foundation pit, considering the protection requirement of surrounding environment. Wholly grouted mortar anchor bars and hollow grouting anchor bars are used respectively in the subsurface excavated region under the conditions of surrounding rock. The supporting system can meet the requirements of project design conformed by simulation, which can give some advices to similar projects in rock region. Source

Zheng X.-L.,Ocean University of China | Liang C.,Qingdao Urban Planning and Design Research Institute | Zhang J.-J.,Ocean University of China | Yue F.,Jinan Municipal Engineering Design and Research Institute | Liu J.-H.,Qingdao Urban Planning and Design Research Institute
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | Year: 2012

A new computational formula was deduced and created to calculate oil content in water-bearing medium through introducing oil dying loss ratio. The results show that this improved formula can measure dry medium solid mass and oil content in petroleum-contaminated water-bearing medium accurately. The value of oil drying loss ratio varies depending on types of oil and water-bearing media. The oil drying loss ratio in coarse sand contaminated by diesel oil is 0.66. The relative error of the new method is about 0.4%, which is far below the relative error of existing methods. Moreover, the measurement accuracy of the new method is not influenced by oil volatility and oil content. Source

Huang W.,Huazhong University of Science and Technology | Zheng M.-W.,Jinan Municipal Engineering Design and Research Institute | Xu F.,Wuhan Institute of Technology | Zhou J.-J.,WISDRI Engineering and Research Incorporation Ltd Company
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2015

As an inseparable component, the decorative cable of ornamental suspension bridge does not carry loads with the main structure. The main cable and hanger rods should have certain internal force that matches with the main bridge so as to keep their line-shapes. An approach was proposed for such bridge to calculate the blanking length and tensile force of the cable and rods. Firstly, a model for the main cable was built with hanger rods simplified as vertical constraints. Secondly, the tensile force of main cable in each section and the constraining force of rods were calculated. Finally, the blanking length of each member can be obtained. With a project in Xinjiang, a partial FE(finite element) model of main cable is established by the MIDAS/Civil to calculate the theoretical tensile forces and blanking lengths of the cable and rods, and check its dynamic characteristics. The as-built bridge meets all requirements. ©, 2015, Northeastern University. All right reserved. Source

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