Quantitating The Environmental Risk Assessment Of Industrial Symbiosis Network

With the development of industrial symbiosis network, its environmental risk issues has emerged, but the research of environmental risk about industrial symbiosis network is also rarely, especially quantitative research about environmental risk of industrial symbiosis network. The paper proposed theoretical framework that quantitatively assesses environmental risk of industrial symbiosis network.This framework based on the analysis of industrial symbiosis network, and used the bowknot method to identify environmental risk of nodes, sifted six categories and 22 indicators including environmental risk during the process in material storage, transportation and production, and the condition of facilities, environmental management and fragility of receptor. Based on complex network theory to identify the Environmental risk of industrial symbiosis network, sifted five categories and 12 environmental risk indicators including the rate of dangerous substance exchange, the stability of symbiotic, distance ratio of environmental risk propagation, average clustering coefficient and average node degree. After indexes normalized calculating the environmental risk indexes of nodes and environmental risk propagation coefficients between nodes by using the risk index method,and integrated them to to build the quantitative evaluation model that assesses environmental risk of industrial symbiosis network. Division of environmental risk indices calculated as 5 risk level, the order of environmental risk indices decides the environmental risk management priorities which could determine the focus of the environmental risk management. The greater the environmental risk of node, the prior of environmental risk management.The paper choose an iron and steel industrial symbiosis network as a case study,through data collection and survey, map the iron and steel industrial symbiosis network and applied the model. The results showed that priority rank of environment risk indices of 12 nodes:coking plant>thermal power plant> iron plant> steel plant> stainless steel plant> sintering plant> refractory plant sewage treatment plant>refractory plant> steel processing plants>tailings pond> building materials factory> cement plant. Coking plant belongs to the high risk level, because environmental risks during the process in the dangerous material storage, transportation are the largest contribution. Sintering plant, iron plant, steel plant, stainless steel plant and thermal power plant belong to medium level, the other nodes belong to the low level. Therefore, coking plant should be priority for environmental risk management. According to result of the environmental risk communication evaluation model that environmental risk propagation coefficient of iron-thermal power plant is the highest (0.104). So iron-thermal power plant should be monitored. According to the results of the environmental risk communication, iron plant-power plant is the highest degree of environmental risk communication, so iron plant-plant symbiosis is key monitoring.