"Waste free city" is a cell project to build a beautiful China. After Shenzhen became the first batch of "waste free city" pilot cities in China, the Ministry of ecological environment released the list of "waste free city" construction cities during the "14th five year plan" period in April this year, and 9 cities in the Pearl River Delta were selected. The reporter learned from the Provincial Department of ecological environment that many provincial technical assistance groups have been established to provide "one-to-one" technical assistance to the pilot cities. Since 2019, the Provincial Department of ecological environment has invested nearly 50 million yuan in national and provincial financial funds to support the pilot of waste free city construction. In practice, the content of "waste free city" is huge. What are the explorations of Guangdong? Remote video patrol inspection improves the supervision efficiency. "We found that the hazardous wastes of this enterprise were not set with identification marks during the inspection, so we immediately contacted the system for rectification, and then the enterprise uploaded the rectification feedback after the identification was added." At the Shenzhen Ecological Environment Bureau, Lin Weiqiang, director of the solid waste and chemicals department, pointed to the solid waste intelligent supervision system and said, "through online supervision, a large number of waste producing enterprises can be supervised with less manpower." The reporter can see from the display screen of the system that at present, intelligent supervision has covered all waste production enterprises, and 25692 waste production units in the city have entered. At the same time, all the disposal enterprises have completed video monitoring and vehicle GPS + video online supervision, and further improve the supervision efficiency by relying on the remote video patrol function created by the system. "We conduct spot checks on enterprises every month according to the plan. Instead of going to the enterprise site, the supervisors contact the environmental protection responsible person of the enterprise through the system and shoot the content we want to check on the site with mobile phones." Lin Weiqiang said that this can reduce the disturbance to the normal production of the enterprise. If the enterprise does not rectify, it will go to the site for inspection and punishment. The proportion of local utilization and disposal of construction wastes has increased to 35%. At present, the daily output of construction wastes in Shenzhen is 380000 tons, of which construction wastes account for more than 85%. How to dispose of huge construction wastes is also a problem faced by many cities. Now, construction wastes are being "reborn" in Shenzhen. "After equipment pretreatment and multi-layer screening, the collected construction waste forms recycled aggregates with different particle sizes. After mixing with cement and fly ash, these aggregates can be made into concrete building materials." In the demonstration base of comprehensive utilization of construction wastes in Dakang, Bao'an District, Li Zhi, general manager of Shenzhen Special Zone Jianfa Environmental Technology Co., Ltd., introduced that "after the main machine pressing and 48 hour curing kiln treatment, the construction wastes become permeable bricks." However, Li Zhi also admitted that the profit effect of the project is still not obvious at present. "Many people can not accept the permeable bricks made of construction waste, but in fact they have passed the relevant quality tests. In addition, the industry is not standardized and needs to be improved." At present, for construction waste, Shenzhen has built 38 fixed construction waste recycling facilities, with a utilization and disposal capacity of 176000 tons / day, and the local utilization and disposal ratio has increased from 21% to 35%. At the same time, Shenzhen will speed up the filling of foundation defects for different types of solid wastes and improve the local utilization and disposal capacity of solid wastes. At present, five major energy ecological parks have been built in the city, and the power generation capacity of domestic garbage incineration has been increased to about 20000 tons / day, and the original domestic garbage is solid