Cradle to Gate
Identity ID
979a82cc-c2fe-4cd6-9ec2-dae6b7523b37
Waste treatment
Associated ID
6b0febe1-4c1e-4b48-be91-a04aeae3c825
Included activities starts
Included activities ends
Description
The initial sludge (95%) is first concentrated and then dewatered by centrifugation with the addition of polyacrylamide (PAM), reducing its moisture content to 75%. The dewatered sludge is subsequently treated using various processing methods.
The wastewater generated during the process is treated by adding a certain amount of FeCl3 and discharged after meeting the required standards.
Activity Description
During the treatment process, sludge first undergoes a thickening stage to reduce its volume and increase its solids content. The thickened sludge is then dewatered, further reducing its moisture content with the aid of flocculants. The dewatered sludge is subsequently treated through various processes. The wastewater generated during the process is treated with flocculants and discharged after meeting regulatory standards.
Process Description
"Sewage sludge" is a byproduct generated during the urban wastewater treatment process. 100% sewage sludge, with a moisture content of 97%. 5%, "sludge" consists of the following components: microorganisms, animal and plant residues, inorganic minerals, potential heavy metals, micropollutants, and pathogens. Treatment methods for this by-product include sanitary landfilling, municipal incineration, and use as a raw material for clinker production. Additionally, sludge can be converted into bioenergy through anaerobic digestion or applied to land following stabilization. In the HiQ database, treatment methods for this by-product include incineration, landfilling, aerobic composting, anaerobic digestion, wet oxidation, pyrolysis/hydrothermal carbonization, and land application. Furthermore, this by-product is utilized in the following processes: clinker production, among others.
Time period
2022
2026
Geography
China
Geography comment
National statistics, literature research
Macroeconomic value
Business-as-Usual
Data validation
Yes
Technology
Current Technology
Technology comment
In China's sludge treatment processes, the thickening stage primarily increases the solids content of the sludge through gravity thickeners, while commonly used equipment in the dewatering stage includes centrifugal dewatering machines, belt filter presses, and recessed plate filter presses.