Main methods of sludge treatment

Sludge treatment methods include concentration dehydration, aerobic composting, anaerobic digestion and drying. The main purpose of sludge treatment is to reduce and stabilize the amount of sludge and facilitate the transportation and final disposal of sludge.

The chemical name of sludge is

Sludge is a mixture and has no chemical formula. Sludge is the product of domestic sewage and industrial wastewater treatment, which consists of solid impurities, suspended solids and colloidal substances, and its essence is the solid part of sewage. The main characteristics of sludge are high water content, high organic matter content, perishable and smelly, fine particles and low specific gravity.

Industrial wastewater sludge also contains toxic and harmful substances, such as heavy metals and persistent organic pollutants.

Excess sludge generated in the primary sewage treatment process; Excess sludge increases the biomass of activated sludge in aeration tank due to microbial metabolism and biosynthesis. Part of the sludge deposited in the secondary sedimentation tank flows back to the aeration tank for sewage reprocessing, and the remaining sludge is discharged outside the system.