The study on industrial water use efficiency of Chinese provinces: Based on network SBM-DEA model and GML index
2019, 34 (7):
In recent years, China's industrial water consumption accounts for about 20% to 30% of all water use. Improving industrial water efficiency and saving use of water resources have become one of the important issues affecting the sustainable development of China's national economy. Based on the network SBM-DEA model and GML index, this paper studies the industrial water use efficiency of each province in China from 2007 to 2015. The results show that: (1) From the annual average, the production stage is at the forefront compared with the sewage treatment stage. There are more provinces at the forefront, and the gap between provinces and frontiers is relatively small. Industrial water use efficiency is high in the production stages of Beijing, Tianjin, Inner Mongolia, Shandong, Guangdong, Hainan, but the efficiency of sewage treatment is low; For Liaoning, Jilin, Anhui, Fujian, Jiangxi, Hubei, Hunan, Guangxi, Guizhou, Yunnan, Qinghai, the efficiency value is lower in the production stage, but the efficiency value in the sewage treatment stage is higher. This is because there are differences in the requirements for sewage treatment in different provinces of China, or even the same requirements, the implementation of different local policies is not the same, and some provinces (such as Beijing) have higher requirements for sewage treatment and policy implementation than other provinces. (2) From the geometric mean of each time period, the GML index value of most provinces in the network and sewage treatment stage is less than 1, but the GML index value in the production stage is greater than 1. It can be seen from the average of 30 provinces that both the EC index and the BPC index in the production stage have improved (greater than 1), but the EC index and BPC index in the network and sewage treatment stages have decreased (less than 1). Therefore, to enhance the industrial water efficiency in the production stage, it is necessary to increase the treatment of industrial wastewater, improve the efficiency of the sewage treatment stage, and raise the awareness of industrial production and pollution control, especially in Beijing, Tianjin, Inner Mongolia, Shandong, Guangdong, and Hainan with low sewage treatment efficiency.
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