Abstract:In the early stage, the idle land or refused landfill site were often used to dispose the sludge an emergency method in many cities of China, which temporarily solved the problem of dewatered sludge from WWTP. Due to the shortage of land resources and the stricter environmental policies, the re-excavation of the aged sludge landfill site not meeting the environmental requirements and the vacation of the landfill site have become the urgent problems to be solved. Compared with the conventional municipal sludge, the design and construction of temporary facilities for temporary landfill and treatment of municipal sludge are quite different, which are mainly reflected in the short service cycle, large capacity, complex sludge properties and difficult treatment of sludge liquid. The project construction should not only meet the requirements of high turnover utilization and wide adaptability of sludge, but also achieve the simultaneous treatment of sludge, sewage and odor to meet the standard. The heterotopic treatment process of "dilution + twist suction + slag removal + sludge conditioning + low-temperature vacuum dewatering and drying" is adopted for the sludge. The treatment process of "pretreatment + biological tank/AO/MBR/NF/RO" is used for the dewatered filter liquid. The two processes are successfully applied and practiced in a large temporary landfill municipal sludge retreatment project, which has some guiding significance for the future similar projects.
