Experimental and statistical models of the water yielding capacity of thickened excess activated sludge treated with chemicals

Summary

The technology of changing the specific resistance of excess activated sludge taken from the sludge thickener at the municipal wastewater treatment facilities was tested by processing the sludge with aluminum sulfate and polyacrylamide (PAA) with doses from 0 to 300 mg/dm³. The degree of impact of each chemical on the degree of sludge dewatering was defined. It was shown that PAA had a greater effect on the water yielding capacity compared to Al₂(SO₄)₃ by 4.4 times with the chemical doses from 0 to 200 mg/dm³ and 2.2 times with the doses from 100 to 300 mg/dm³. Mathematical dependences of the change in the sludge specific resistance on the amount of Al₂(SO₄)₃ and PAA added were obtained. The mathematical models are also presented in graphical form (isolines). The optimal doses of coagulant and flocculant for the chemical treatment of the wastewater sludge under study were determined.

Key words

surplus active silt , sludge specific resistance , mathematical and graphical models of the sludge water yielding capacity , optimal dose of chemicals