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Removal of Heavy Metals from Contaminated Soils by Washing with Citric Acid and Subsequent Treatment of Soil-washing Solutions Lei SUN1, Han-qiao LIU1,2,3*, Guo-xia WEI1, Zhen-hua WU1, Wei YANG2 1School of Energy and safety Engineering, Tianjin Chengjian University, 300384, Tianjin, China 2Tianjin Technology & Engineering Center of Contaminated Sites Remediation, 300468, Tianjin, China 3School of Environment science and Technology, Tianjin University, 300072, Tianjin, China *lhqlkx@aliyun.com Keywords: heavy metals; contaminated soil; washing; adsorption Abstract: Soil washing experiments were carried out with citric acid as washing reagent for the remediation of soils highly contaminated with heavy metals, then activated carbon was used in absorption processing for leaching solution.
Materials and Methods Soil Sample Preparation Soil samples were collected from the greenbelt in Tianjin Chengjian University, which were measured as weak acid by pH meter.
Journal of Hazardous Materials, 2001, 85: 111-125
Journal of Hazardous Materials, 2008, 154: 153-160.

Applied Mechanics and Materials.852:459-65
Journal of Pipeline Systems Engineering and Practice. 14(3):03123001
Materials Today: Proceedings. 80:1150-7
Materials Today: Proceedings. 26:781-6
Corrosion Science. 85:318-30.

Materials and methods Materials.
Journal of Hazardous Materials. 239-240, 348-354(2012) [5] J.
Ozone: Science & Engineering: The Journal of the International Ozone Association. 35:6, 438-447. (2013)

Figure 2 shows the material flow, electricity flow and value flow between each entity.
The materials include commodities and greenhouse gases.
Procedia Environmental Sciences, 13 (2012), pp. 1602-1608 [5] Z.
Journal of Sustainable Development, 6 (2013), pp. 19-31 [8] Y.
Higano: Studies in Regional Science, Vol. 26 (2007), pp.181-187.

Experimental Materials.
Shiono: European Polymer Journal.
Kang: Materials and Design.
Bayoumi: Materials and Design.
Ray: Materials Science and Engineering A.

College of Materials Science and Engineering, Lanzhou University of Technology; 2.
Pressure vessel materials are composed by the 2205 dual phase steel with inner thickness of 4mm and the16MnR outer steel with the thickness of 80mm.
In order to get more effective numerical calculation results, the weld on pressure vessel can also be seen as materials with different attributes.
Journal of Qinghai University,2004,22(5): 20-24
Science and technology information (academic research), 2007,(20):9-11

The community which is suitable for people to live should not only have the environmental conditions include the basic material life, interpersonal and spiritual civilization ,but also meet the basic living demand of safety, convenient, healthy and comfortable.
Acknowledgments This work was financially supported by the National "12th Five-Year"Support Program Subject Project Foundation (2011BAJ06B04) and The Science and Technology Research Project Foundation of Liaoning Education Department (L2011211).
Yang: Advances in Earth Science Vol. 23(3) (2008), p. 323 (In Chinese) [2] Ch.
Xiu: Ningxia Social Science Vol. 4(2008), p. 149 (In Chinese) [7] H.
Liu: Journal of WUT(Information & Management Engineering) Vol. 28 (12)(2006), p. 94 (In Chinese)

(1) Simulated annealing algorithm considers each combination state to be microscopic of material system in the solid annealing process, and considers to be Internal energy in the state.
[2] Kang Lishan, Xie Yun, You Shiyong, et al: Non-Numerical parallel algorithm(Science press, China 2003)
[3] Chen Huagen, Wu Jiansheng, Wang Jialin, et al: Journal of Tongji University(Edition of Natural Science), Vol. 32(2004), p. 802 [4] Geem Z W,KimJ H,Loganathan G V: Simulation, Vol. 76(2001) p.60 [5] Zhang Dongmei: Coal Technology, Vol. 30(2011), p. 26 [6] Jin Jiangang, Liu Juqun: Science and Technology Consulting Herald, Vol. 28(2007), p. 148

Project document management: The project document management implementation of project management, documentation of the development process includes: project application, research contracts, the title of the report, review form (phase review, final review), application (the purchasing, processing, coordination, tardiness, and submit the application), relates to the material review records, research plans, drawings, test syllabus, test reports, summary reports and other scientific research project development process.
Scientific research management: The realization of various scientific research achievements and awards of science and technology management, such as: papers, monographs, patent, copyright, standard, science and technology award, key products etc.
System maintenance: System maintenance module mainly include: organization management, scientific research personnel management, user management, journals of maintenance, parameter setting, mail service, system operation log, process configuration, application management, database management etc. 5 Hierarchical system and software architecture Hierarchical system and software architecturediagramare shown in Figure 4: Figure 4 Hierarchical system and software architecture diagram 6Summary In this paper, combined with the characteristics of scientific research projects, the scientific research project management system planning and design.
Science and technology information . 2009 NO.24

China 2School of Mechanical Engineering, University of Science and Technology, Beijing P.R.
Physical simulation is used in conventional forming process for skew rolling, for example, through using rubber earth, steel ball forming process in skew rolling is simulated by scholar in Japan, internal material flowing pattern of rolled pieces is obtained [1], motion and strain of radial cross-section of rolled pieces are approached by means of gain moiré fringes methods[2], but axial deforming is not researched in previous works, therefore, QIAO S L researches motion and strain of axial cross-section of rolled pieces by using of dense grid moiré fringes method in China, but motion and strain of all cross-section still can not be obtained[3], there are lots of limitation in previous works.
References [1]Zhou Y P: The Numerical Simulation of the Copper Ball In Skew Rolling (Beijing University of Science and Technology, Beijing, 2007)
[2]Qiao S L, Hu Z H: Wuhan Metallurgy Science Technology University Vol.17 (1994), p.143 [3]Jiang Z Y, Ties A K: Metal Process Technology Vol.25 (2001), p.112 [4]Wang B Y，Liu J P and Hu Z H: Rolling forming curved face in skew rolling //Forging Symposium(Beijing: Aviation Industry Press，1999, p.382)
[5]Shi X M: Machinery (2002, 06), p.16-18 [6]Zhao J J, Ma Z H and Hu Z H: Journal Of Iron And Steel Research( 2002,01), p.22-25