为全面了解河南省工业用水重复利用情况，提出一种基于用水统计的工业用水重复利用率测算方法，通过河南省全口径用水量数据和典型企业水重复利用数据，测算河南省工业用水重复利用率，并对测算成果进行分析。结果表明：河南省2022年工业用水重复利用率为94.15%，各市在82.89%～96.76%，各行业在23.89%～98.04%；河南省工业水重复利用整体水平较高，城市之间差异显著，纺织、食品和其他行业水平较低，火电行业对河南省工业用水重复利用率的影响程度最高；全省提高工业用水重复利用率的节水潜力为7.97亿m3，工业节水潜力较为可观。采用测算方法适用于区域工业用水重复利用率测算，测算成果符合河南省实际，可为河南省加强工业节水管理、提高工业用水效率提供参考。

The industrial water recycling rate is an important index to reflect industrial water use efficiency, evaluate industrial water recycling and industrial water saving degree. The calculation and analysis of the recycling rate of industrial water is helpful to comprehensively understand the recycling situation of industrial water. It is of great significance to predict the potential of industrial water saving, improve the level of industrial water saving and promote the sustainable development of industry. At present, the research on industrial water recycling rate focuses on the calculation of enterprise water recycling rate and the utilization of industrial water recycling rate, but lacks the research on the calculation method of regional water recycling rate. Current situation the statistical survey system of water use in our country has basically achieved the comprehensive coverage of self-provided water source industrial enterprises, improved the quality of industrial water data, based on this, the calculation of industrial water recycling rate will be more reasonable and reliable. Based on the water use statistics survey in Henan Province, a calculation method of the recycling rate of regional industrial water was proposed. By classified and calculated the water consumption of different water sources and data sources, the industrial water consumption of different industries in each city was obtained. According to the recycling rate of various industries calculated by typical enterprises, the quantity of recycled water of different industries in each city was calculated. Finally, the industrial water recycling rate of each city and Henan Province was calculated. The results were analyzed from the aspects of industry level, spatial distribution, sensitivity and water-saving potential. K-means clustering method was used to analyze the spatial distribution characteristics of industrial water recycling rate in Henan Province. The influence of each industry on the industrial water recycling rate in Henan Province was studied by single factor sensitivity analysis. Industrial water-saving potential was predicted. Based on the data of 2022, the industrial water recycling rate of Henan Province was calculated and analyzed. The results showed that the recycling rate of industrial water was 94.15% in Henan Province, 82.89% ~ 96.76% in various cities, and 23.89% ~ 98.04% in various industries. The overall level of industrial water recycling in Henan Province was higher, there were significant differences between cities， the level of textile, food and other industries were lower, and the thermal power industry had the highest impact on the recycling rate of industrial water in Henan Province. The water-saving potential of improving the recycling rate of industrial water were 797 million cubic meters， which was considerable. The calculation method based on water use statistics is scientific and reasonable, which is suitable for the calculation of regional water recycling rate. According to the analysis, the level of regional water recycling rate is restricted by the local water structure and the level of industrial recycling rate. The higher the proportion of water used by industries with high recycling rate, the higher the level of regional water recycling rate. Among various industries, the textile and food industries are the focus of improving the industrial recycling rate, and the thermal power industry is the focus of improving the water recycling rate of Henan Province and various cities. The calculated results are consistent with the actual situation of Henan Province, and can provide reference for Henan Province to strengthen industrial water-saving management and improve industrial water use efficiency.

TV213.4

引江济淮工程(河南段)工程科研服务项目(HNYJJH/JS/FWKY-2021002)；河南省水利科技攻关计划项目(GG202022)；河南省基本科研业务费项目