Turning waste into treasure Chongqing's kitchen waste brings 100 million yuan in revenue a year

How to turn kitchen waste into treasure? Recently, the reporter learned from Chongqing Environmental Sanitation Group Co., Ltd. that the company's research on "kitchen garbage collection, transportation, treatment and resource set of key technologies and industrialization projects" won the first prize of Chongqing's scientific and technological progress.

After 7 years of research, Chongqing Environmental Sanitation Group has developed treatment technology and treatment equipment that are suitable for China's kitchen waste materials concession, breaking the monopoly of foreign organic waste treatment technology and making China master the harmless treatment and resource utilization of organic waste for the first time. Core Technology. This core technology has not only exerted its "power" in the treatment of food waste in Chongqing, but has also been promoted and applied throughout the country, with an annual disposal capacity of food waste of 6.2 million tons.

Overcome 4 core key technologies in 7 years

Food waste refers to food waste and waste edible oils and fats generated in food processing, catering services, unit meals and other activities other than daily life of residents. It is estimated that Chinese restaurant kitchen waste generates about 100 million tons per year.

"Compared with other countries, the composition of food waste in our country is complicated, mainly manifested by the characteristics of materials with high impurity rate, high oil content, high water content, and high salt content." The relevant person in charge of Chongqing Environmental Sanitation Group introduced this Carrying out the harmless treatment and resource utilization of Chinese food waste has brought huge technical difficulties.

In 2011, the Chongqing Municipal Sanitation Group set up a "key set of technology and industrialization projects for the collection, transportation and recycling of food waste," jointly with Chongqing University, Chongqing Academy of Sciences, Naide Industrial Co., Ltd. and other institutions and units, and invested 70 million yuan Yuan, after 7 years of in-depth research and development, has achieved 4 core key technical achievements in kitchen waste disposal.

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Among them, the spiral partial-leaf stirring system, high-efficiency anaerobic reaction system and anaerobic digestion online monitoring and early warning system developed by the project have realized combined anaerobic digestion of organic waste such as kitchen waste, fruit and vegetable waste, sick and dead livestock, sludge In the production of new energy, the conversion rate of organic matter has increased to more than 85%, which fills the gap in the online detection technology of anaerobic digestion at home and abroad.

At the same time, a total of 45 patented technologies with independent intellectual property rights were obtained during the project development process; 34 papers were published; 8 related technical standards were written, including 3 international-level technical standards.

The technical achievements have been widely used in the country

"If a large amount of kitchen waste cannot be treated harmlessly, it will seriously endanger food safety and threaten the water environment and the urban environment." Zhang Xingqing, Secretary of the Party Committee and Chairman of Chongqing Environmental Sanitation Group, said that the effective treatment of kitchen waste can not only come from the source By reducing the production of harmful substances to the human body, we can also turn waste into treasure.

Since 2009, Chongqing has taken the lead in carrying out the collection and transportation of food waste in the country, and the completed Heishizi food waste treatment plant was the first in the country to use the world's leading "anaerobic digestion, cogeneration" technology to treat food waste . In 2017, the kitchen waste treatment capacity of the Heishizi Kitchen Waste Treatment Plant reached 434,800 tons. Since its operation, it has treated and recycled 2.75 million tons of kitchen waste harmlessly.

At the same time, the bio-diesel blended fuel modulation technology developed by the project can be used to obtain bio-fuel blended products; another new biogas pressure water purification technology and equipment developed by the project can turn garbage into biogas for power generation. At present, the kitchen waste in the main urban area of ​​Chongqing is used for biodiesel refining and biogas power generation.

Thanks to the complete set of key technical achievements in the collection, transportation and recycling of kitchen waste, Chongqing has built the country's largest and most advanced technology for the harmless treatment and recycling of kitchen waste and the collection and transportation of urban and rural food waste areas system. According to reports, the construction of this collection and transportation system is mainly carried out by Chongqing Environmental Sanitation Group as the main body of investment, assisting all districts and counties to complete the reduction, harmless treatment and resource utilization of kitchen waste.

The intelligent collection and transportation network logistics system of restaurant and kitchen waste realizes the whole process of waste data collection, visual monitoring, intelligent decision-making and refinement through the establishment of intelligent and efficient fine-sorted waste sorting logistics base, sorting and releasing from the source of the residents-sorting transportation-sorting and disposal Management, to solve the problems of large input, low efficiency and poor effect of manual waste classification.

“Almost all major cities in the country such as Beijing, Guangzhou, Shenzhen, etc. come to Chongqing to investigate the collection and transportation of kitchen waste.” Zhang Xingqing said that the technical achievements of the project have been widely used in 43 organic waste disposal projects in Beijing, Shanghai and other countries. The cumulative output value is 4.5 billion yuan and the annual disposal scale is 6.2 million tons.

"At present, we are building the largest and most comprehensive urban vein industrial park in Luoqi, Yubei, and it is expected to be completed by the end of next year." The relevant person in charge of Chongqing Environmental Sanitation Group introduced that after the industrial park is completed, it will process 2100 tons of garbage per day , Will achieve full coverage of the kitchen waste disposal in the main city area.

"We will also develop an intelligent coupling and systematic platform for urban sanitation operations based on the Internet of Things, big data and cloud computing technology, and establish an intelligent and efficient waste sorting logistics base." Zhang Xingqing introduced that in the future, residents' domestic waste will be released and classified from the source From transportation to classification and disposal, the whole process of data collection, visual monitoring, intelligent decision-making, and refined management can be achieved to solve the problems of large manual waste classification input, low efficiency, and poor effect in the past. (Reporter Yong Li, an intern from Wang Li)