In recent years, with the rapid improvement in my China’s sewage treatment capacity, the amount of sludge has also increased significantly. In 2021, urban wet sludge production will reach nearly 50 million tonnes, almost double that of 2010, and the 10-year average compound growth rate from 2011 to 20,221 will reach 7.3%.
With the modernization and reconstruction of the wastewater treatment plant, the elimination of sludge extended the coupling pathways of waste incineration, collaborative elimination of the cement kiln and participation in soil remediation, and the technical process broke the bottleneck. of strangulation. Research shows that at the current level, the cost of sludge drying and incineration less than 300 yuan / ton cannot complete the whole process of commercial exploitation in developed areas. The cost of collaborative treatment is often slightly lower. For example, the total cost of the waste incineration plant, including profit, is generally around 400 yuan / ton.
After years of exploration, China’s sludge treatment and disposal industry has mainly formed four main technical pathways for stable treatment and safe disposal: “Anaerobic digestion + land use”, “Aerobic fermentation + use land “,” dry incineration + ash landfill or building materials use ‘, and’ deep dewatering + emergency landfill “, which effectively supports the solution of sludge treatment and disposal problems in China. Currently, various technologies account for 31% of the total scale of sludge treatment and disposal, 27% of mechanical dewatering, 20% of anaerobic digestion and 18% of aerobic fermentation.