UDC 628.336.4
DOI 10.35776/VST.2024.09.07

Kichigin V. I., Iudin Aleksandr

Study of the technology of chemical dewatering of thickened
excess activated sludge using experimental-statistical models

Summary

The technology of chemical dewatering of thickened excess activated sludge by processing wastewater sludge with six types of coagulant and polyacrylamide in doses from 0 to 300 mg/dm³ was studied. The the effect of each chemical on the degree of sludge dewatering was determined. Mathematical models of the sludge specific resistance changing dependence on the amount of coagulant and flocculant added into the sludge were obtained. The mathematical models are presented both in implicit and explicit (isolines) form. It was proven that the process of maximum reduction of the specific resistance of thickened excess activated sludge is more efficient with coagulants: «Aqua-Aurat™-30», aluminum polyoxysulfate or «GranPAKS™» in doses up to 25 mg/dm³ and flocculant PAA in doses of 175–200 mg/dm³.

Key words

sludge specific resistance , mathematical and graphical models of the sludge water yielding capacity , optimal dose of chemicals , thickened excess activated sludge