Design and Operation of Sludge Deep Dewatering Project Based on PAC + PAM Conditioning

WWTP; water content of sludge; sludge deep dewatering; PAC &;  PAM; belt concentrator; diaphragm pressure filtration

There were three dewatering machine rooms with 80% of sludge water content in Hefei Economic Development Zone WWTP, two of which were belt concentrator and one of which was centrifuge. According to the plan, the water content of sludge in the plant should be adjusted to 60% and the process of concentration, conditioning, plate and frame filtration was proposed. For the concentration section, after full comparison and selection, the new scheme was finally adopted. At the same time, in combination with the actual situation of Hefei and the project, PAM & PAC were adopted in the tempering section. After trial operation, the water content of sludge met the design requirements. This project can provide reference for similar large and medium-sized wastewater treatment plant to improve the water content of sludge, and provides thought and engineering experiences for reducing the dosage of chemical agents and increasing the diversification of conditioning methods.