| With the fast development of economic and industrial scale,China is facing the increasingly prominent problems of water resources tension and water ecological environment pollution.The Central Committee of the Party and the State Council pay great attention to water resources management,and since 2015,China has been implementing double control actions on total water consumption and intensity of water consumption to better stabilize total water consumption and improve water efficiency.Triangle of Central China is the largest urban cluster of the Yangtze River Economic Belt and the focus area in the strategy of implementing the rise of central China.Promoting the development of Triangle of Central China is conducive to cross-regional integration and optimization of resource factors,as well as the protection of the Yangtze River water ecological environment.Therefore,taking Triangle of Central China as the research object,it is of great value to study how to improve industrial wastewater discharge efficiency and reduce industrial wastewater discharge for water resource protection in the Yangtze River basin and even for the green development of the whole country.In this thesis,the following aspects of research are conducted based on the background of the double control of total water consumption and intensity nationwide:(1)research on the spatial differentiation of industrial wastewater discharge and influencing factors in Triangle of Central China: firstly,the spatial and temporal distribution and spatial clustering of industrial wastewater discharge in Triangle of Central China are analyzed based on the environmental statistics of 31 prefectural cities in Triangle of Central China from 2010 to 2019 using GIS technology and ESDA method;secondly,a spatial econometric model(SARAR)is used to study each factor affecting the change of industrial wastewater discharge Secondly,the SARAR model was used to study the factors influencing the change of industrial wastewater emissions and the degree of their influence.The results show that,except for a small increase in 2011,the industrial wastewater discharge in Triangle of Central China has a tendency to decrease year by year,and the decrease is obvious in 2013 and 2016,among which the decrease is the largest in the city cluster around Changzhutan,the second in the city cluster around Poyang Lake,and the smallest in Wuhan city circle.The overall regional pattern of industrial wastewater discharge in Triangle of Central China shows the characteristics of high in Wuhan city circle,low in Poyang Lake city cluster and Changzhutan city cluster,and also shows obvious spatial agglomeration characteristics,with significant spatial correlation and the trend of strengthening year by year.The SARAR model estimation results show that the population scale,the per capita GDP and the regulation of environment have obvious promotion effect on the total industrial wastewater discharge,while the advanced industrial structure The estimation outcome of SARAR model shows that population size,GDP per capita and environmental regulations have a strong influence on total industrial wastewater effluent,while advanced industrial structure,technological innovation and industrial agglomeration have a dampening effect on total industrial wastewater effluent.(2)Research on the performance of industrial wastewater discharge in Triangle of Central China under the dual control of total water use and intensity: First,using industrial water use,water use per 10,000 yuan of industrial value added,labor force and capital stock as input indicators,industrial graywater footprint and industrial value added as involuntary output and voluntary output indicators,respectively,for each prefecture-level city in Triangle of Central China,we measured the industrial wastewater discharge efficiency of each prefecture-level city in Triangle of Central China from 2010 to 2019 based on the super-efficiency SBM model.effluent efficiency;secondly,the Malmquist-Luenberger index model is used to calculate the total factor productiveness index and the related decomposition index to dynamically analyze the industrial wastewater effluent efficiency in Triangle of Central China.The outcomes show that the average value of the overall industrial wastewater effluent efficiency in Triangle of Central China from 2010 to 2019 is between 0.81 and 0.97,which does not reach DEA effective.The value of performance of the Poyang Lake city cluster is low,the value of efficiency of Wuhan city circle is maintained at a high level and in the efficiency frontier,and the growth of efficiency is not obvious,and the change of performance of Changzhutan city circle is extremely unstable.From the dynamic analysis results of Malmquist index,it can be seen that the industrial wastewater discharge efficiency of Triangle of Central China shows a rising trend in general,which is mainly due to the technological progress.(3)Research on the emission reduction potential of industrial wastewater in Triangle of Central China under double control of total water use and intensity: Using the same input-output data as above,the group frontier technical efficiency,common frontier technical efficiency and efficiency gap were measured on the basis of both group frontier and common frontier models,and the emission reduction potential of each prefecture-level city in Triangle of Central China from 2010-2019 was calculated by combining with industrial graywater footprint data.The results show that: during 2010-2019,the industrial graywater footprint emission reduction potential of Triangle of Central China shows a decreasing trend in fluctuation,but the decrease is relatively small;the industrial graywater footprint emission reduction potential of the heavy industrial wastewater emission area decreases the most and contributes the most to the reduction of the overall emission reduction potential of Triangle of Central China,and its industrial graywater footprint emission reduction potential decreases to the lowest point in the group in2017 and 2019,respectively;the medium industrial grey water footprint emission reduction potential of industrial wastewater discharge area decreased significantly in 2015,but failed to maintain the low emission reduction potential and increased significantly again in 2017;the industrial grey water footprint emission reduction effect of light industrial wastewater discharge area was the worst.The potential industrial graywater footprint reduction in the heavy industrial wastewater discharge area is all caused by technology gaps,the medium industrial wastewater discharge area is mainly caused by technology gaps,and the light industrial wastewater discharge area is mainly caused by ineffective management. |
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