This project belongs to the field of food science and technology and is mainly used for the thermal sterilization process of canned food. Thermal sterilization of canned food is to heat the sealed canned food to a certain temperature and keep it for a period of time. At present, the domestic thermal sterilization process adopts steam exhaust-temperature-constant temperature-direct discharge cooling of cooling water. This process consumes high energy. According to statistics, for every cylinder (about 1 ton) of canned lunch meat products produced, 15 tons of cooling water and sewage volume are also about 15 tons. With the increasing shortage of water resources in my country, such a high-energy-consuming sterilization and cooling process is no longer suitable for production and application in the canning industry. Aiming at the problem of high water consumption and large sewage volume during the sterilization and cooling process of cans, this project studies the use of can sterilization and cooling water circulation technology to replace the direct discharge of cooling water, reduce the water consumption in the cooling process by more than 60%, and reduce the sewage volume by more than 60%. On the premise of ensuring the safety of canned food and improving product quality, we will achieve the goal of saving water and reducing emissions. The innovative results achieved in this project are as follows: 1) Improve the structure of the sterilization cylinder and determine the sterilization and cooling process to ensure the effectiveness of sterilization and product safety;2) Integrated water treatment technology, using a two-channel high-efficiency filtration system to remove oil stains and suspended substances and other impurities to ensure that cooling water meets the requirements for recycling; 3) Efficient and rapid heat exchange technology adopts a cooling system that meets environmental protection requirements to improve heat transfer efficiency, ensure that products are cooled to the corresponding temperature within the specified time, and reduce energy consumption;4) Online automatic control technology, using programmable logic controllers, control temperature, flow, pressure and other parameters to improve production efficiency. After technical research, this project has replaced the direct discharge of cooling water through the recycling technology of canned sterilization and cooling water. The sterilization and cooling water used for each jar of canned products has been reduced from about 15 tons to 5 tons, saving 10 tons of water, and reducing the amount of sewage. 10 tons. After the project was promoted and used by two subsidiaries of the company in 2010, it saved about 500,000 tons of water annually and reduced sewage volume by about 500,000 tons, with direct economic benefits of approximately RMB 3.25 million. The novelty search report issued by the Shanghai Science and Technology Novelty Search Consulting Center of China Academy of Sciences shows that there have been no relevant technology or product patents at home and abroad for the "Research on the Recycling of Sterilization and Cooling Water in Canned Food Production Process". The project is novel and has good market application value. The comprehensive technology of the project is leading in China and has reached the international advanced level. The related technologies developed in this project have authorized 2 utility model patents, accepted 2 invention patents, published 1 paper, and have independent intellectual property rights. The results of this project have been applied to our company's canning production enterprises. The China Canning Industry Association spoke highly of the implementation of this project and awarded the "China Canning Industry Science and Technology Award" to promote the promotion and application of the results of this project in the canning industry, with broad application prospects. As my country's main export industry, the annual output of canned products has increased year by year. In 2012, my country's annual canned output was 9.71 million tons. Promoting and applying this technology in the canning industry has huge prospects for water conservation and emission reduction, which is important for saving my country's industrial water and reducing environmental pollution have obvious economic and social value.