| The water resources and water environment problems in industrial parks are more prominent,and the concept of water footprint is introduced in order to reasonably allocate water resources in parks,improve the efficiency of water resources utilization in parks and reduce water pollution.On the one hand,the water footprint can quantify the impact of industrial production activities on water resources,identify the characteristics of water consumption and pollutant discharge in the park,and provide countermeasure suggestions for the sustainable use of water resources.On the other hand,the evaluation of water utilization efficiency in the park,the establishment of the park water network model,the identification of key nodes with potential for improvement,combined with the results of water network optimization,can be used for the park water supply,water use and drainage The results of water network optimization can provide suggestions and countermeasures for the optimization of water supply,water use and drainage systems,the construction of multi-level efficient water use model,the upgrading of treatment facilities and the optimization of pipeline networks.Based on the water footprint theory,water resources efficiency evaluation theory and water network optimization theory,this paper constructs a water footprint accounting method,water resources utilization efficiency index system,water resources utilization efficiency evaluation method and water network optimization model applicable to industrial parks.Taking an industrial park in Yunnan as an example,the above-mentioned model and method are used to calculate the indicators related to the water footprint of the park.On this basis,the water use efficiency evaluation index system of the park is constructed from three aspects: water circulation and reduction,pollution emission control and water system management by reviewing literature and relevant standards and expert consultation.Fuzzy evaluation method was used to systematically evaluate the water resources utilization efficiency of the park from 2010 to 2020 and identify the potential for water saving and emission reduction,and finally the constructed water network optimization model was used to optimize and scenario analyze the water network of key industries in the park and select the most suitable solution,which significantly improved the water resources utilization efficiency of the park compared with that of 2020.The results show that:(1)Since 2010-2015 period,the water resources utilization efficiency of the park belongs to level Ⅲ,and in the second half of 2015,we started to improve the standard transformation,and the water resources utilization efficiency was improved to level Ⅱin 2016-2020,and according to the distribution of affiliation,the affiliation of level Ⅰand Ⅱ has room to rise.The weights of C1 water footprint efficiency,C3 blue water footprint efficiency,C6 gray water footprint efficiency and other indicators in the indicator layer are in the top three.(2)Choose the scenario of w1,w2,w3 combination of three treatment units,at this time,the fresh water demand is 1440 m3/d,a 64% reduction,wastewater discharge1360 m3/d,wastewater reuse rate reaches 40.5%,total cost 486.09 million yuan/year.(3)After choosing w1,w2,w3 three treatment units of the water recycling indirect utilization model for optimization,the park water utilization efficiency is significantly improved,according to the principle of maximum affiliation,at this time the park water utilization efficiency reaches the level of Ⅰ. |
