Development History of Sludge Treatment and Disposal Technology in China
This article mainly introduces the current situation and policies of sludge treatment and disposal in China,as well as the technological development process of sludge treatment and disposal.The main technologies for sludge treatment and disposal in China include concentration,dehydration,and drying in sewage treatment plants,as well as end-of-life landfill,land use,incineration,and building material utilization and disposal.Sludge thickening and dehydration refers to the use of gravity,air flotation,or mechanical methods to reduce the water content of sewage plant sludge to around 80%.The main methods of sludge treatment include anaerobic digestion,aerobic fermentation,sludge thermal drying,mechanical deep dehydration,alkali stabilization,as well as new microbial protein extraction,pyrolysis gasification,supercritical water oxidation,etc.The sludge disposal methods generally include landfill,land use,building material utilization,sludge incineration,and other resource utilization methods,such as sludge carbonization.Elaborate on the design parameters of sludge treatment and disposal projects,and compare the advantages and disadvantages of sludge treatment and disposal technologies.Based on the actual situation,this paper provides reference for the preparation of sludge treatment and disposal project plans in different regions of China according to local conditions.
sludge treatmentadapt to local conditionsland useincinerationutilization of building materials
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