Removal Efficiency of Solids in Sludge from Thickening Tank by Sludge Filter

The solids removal efficiency of the existing bar screen in Bailonggang Wastewater Treatment Plant was poor.The high solid content in sludge led to severe wear of sludge treatment facilities and exerted influence on their normal operation.Therefore,a new high-efficiency sludge filter was planned for import.The solids removal efficiency of an imported sludge filter with treatment capacity of 80 m3/h was investigated through experiments,and the optimal parameters were determined.The results showed that the sludge filter using 32-mesh standard sieve could achieve a high removal efficiency of solids,and the highest removal rate of solids was over 65%.The optimal parameters of sludge filter were as follows: the flow velocity of sludge was 55 to 70 m3/h,the sludge concentration was 0.6% to 2.0%,the solid concentration of sludge was over 3.0%,and VS/TS of sludge was over 60%.