Research On Comprehensive Assessment And Regulation Of Environmental Risk Of Brownfield Reuse

Urban economic restructuring has a direct impact on the changes of land use. A lot of contaminated and wasting lands will appear during many enterprises'relocating and changing the line of production. With the depletion of resources and the improvement of the human's environmental awareness,the management of brownfield is particularly important. In recent years,china has gradually into middle and later periods of industrialization, and economic structure, industrial structure and the development model of urban have undergone enormous changes. Meanwhile,china is increasingly facing serious problem of brownfield use. Therefore, it is very important and urgent to make clear environmental risks in using brownfield and to formulate reasonable and effective control measures.This paper studies and discusses the assessment and regulation of environmental risks of brownfield reuse from the perspective of environmental management, in order to improve the efficiency of urban land use,protect land resources and sustainably use land.Based on the studies of related theories such as the connotation and the types of brownfield, this paper proposes the connotation of comprehensive assessment of environmental risks of brownfield reuse, introduces the perspective of life cycle theory and deeply studies the comprehensive assessment and regulation of environmental risks of brownfield reuse through the empirical research.In the first part,this paper identifies the connotation and characteristics of environmental risks and comprehensive assessment of brownfield reuse on the basis of the concepts of brownfield, brownfield reuse and environmental risks. The second part detailed the status, problems and reasons of brownfield use in china for accurately and completely identifying the environmental risks of brownfield reuse. The third part, according to the meaning and application of life cycle theory, divides the whole life cycle of brownfield reuse, and identifies each environmental risk of brownfield reuse on the basis of life cycle of brownfield reuse by Cause-Effect Diagram.The fourth part, qualitatively and quantitatively, comprehensively and focally, studies the contents and methods of comprehensive assessment of environmental risks of brownfield reuse, and constructs a regulation system of environmental risk.With the development of Xishan District, the fifth part determines the types of brownfield in Xishan, comprehensively assess its environmental risks, identifies the important regulation measures according to the results of risk assessment and the general control system, and then empirically researches comprehensive assessment and regulation of environmental risk of brownfield reuse.The research methods used in this paper include analytic potential ecological risk index, multi-channel exposure model, hierarchy process, grey evaluation method, and other method such as literature research, field survey method, etc. The empirical results show that the level of environmental risk is moderate in Xishan District, and land-use policy risk, financing risk, environment risk, human health risk, liability risk and other factors have great impacts on brownfield reuse.The risks are differert with each development areas, such as,contamination risk is high, and economic risk, policy risk, planning risk are low in Xidong area.Contamination risk is minimal, but economic risk is relatively high in Goose lake town. In addition, technical risk, social risk and liability risk are not very different in the four area of Xishan District.Quantitative indicators of ecological risk and human health risk are respectively moderate and low, including more serious pollution of Cd and Cr. Finally, according to the general control system and the results of assessment, this paper develops ten control measures such as a comprehensive list of brownfield survey,improving legal and policy system of risk management of brownfield, guaranteeing multi-funds system to support brownfield reuse,the core of government and effective cooperation with various departments, preventing and controling the ecological and human health risks,special treatment and rehabilitation scheme,increaseing the technical inputs and improving the technical system,the combination with relevant planning, promoting the participation of all stakeholders,the establishment of long-term monitoring system,and so on. It is to verify the scientific and feasibility of the theoretical study in this paper through an empirical research.