Sludge from sewage treatment plant has been buried underground for two years. Can I eat vegetables now?

In Europe and America, the advanced sludge treatment technology of Japanese sewage treatment plants has always been dominated by agriculture, while in China, due to various problems such as technology and rulers' level, it is almost landfill. Sewage sludge cannot be directly used for agriculture! Decomposition of organic matter requires anaerobic digestion or high temperature fermentation. Sludge from domestic sewage treatment should be used for land use first, but not for industrial wastewater sludge containing heavy metals, toxic and harmful substances and persistent organic substances, which conforms to CJ/T309 Sludge Disposal of Urban Sewage Treatment Plants and GB 156 18 Soil Environmental Quality Standard. In other words, if you dump untreated industrial sewage sludge on your land and declare your land scrapped, growing vegetables will only transfer pollutants from the land to your vegetables. Of course, if you don't eat anything, the consequences of long-term consumption can be seen in Japanese pain. . If it is domestic sewage sludge, it will take almost two years, but for the health of family and others, I still hope you can take samples. See if heavy metals and persistent organic compounds exceed the standard.