Operation of the aeration tanks with high sludge dosages at the Moscow Wastewater Treatment Facilities

Summary

The process parameters of the two biological wastewater treatment units with gravity sludge separation at the Liuberetskie Wastewater Treatment Facilities in Moscow (LOS-1 and LOS-2) are considered. The units operate with high dosages of activated sludge (4.5–5.5 g/l at LOS-1 and 7–9 g/l at LOS-2), providing for the regulatory values for suspended solids in the effluent after biological treatment. Attention is paid to the characteristics of activated sludge, as well as to the operating conditions of secondary settling tanks, that enable maintaining high sludge dosages at the standard treatment quality for suspended solids. An analysis of the plant operation revealed the patterns and process conditions oriented to increasing the oxidative capacity of the facilities by increasing the sludge dosage. The knowledge gained can be used to change the approaches to designing new treatment facilities and improve the efficiency of the existing ones.

Key words

wastewater treatment , activated sludge , active sludge dosage , aeration tanks , municipal wastewater