Tag:sludge specific resistance

№9|2024

WASTEWATER SLUDGE TREATMENT

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.

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№11|2023

WASTEWATER SLUDGE TREATMENT

UDC 628.32
DOI 10.35776/VST.2023.11.08

Kichigin V. I., Iudin Aleksandr

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.

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Журнал ВСТ включен в новый перечень ВАК

Шлафман В. В. Проектирование под заданную ценность, или достижимая эффективность технических решений – что это?

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