Chemical Safety Science, 2018, Volume 2, No 2, p. 286 — 294


Utilization and biodegradation of wastes

UDC 628.336.3                                                           Download PDF (RUS)

DOI: 10.25514/CHS.2018.2.14122




E.S. Dremicheva* and A. S. Gavrilov

Federal State Budgetary Educational Institution of Higher Education

Kazan State Power Engineering University, Kazan’, Russia, *e-mail:

Received October 26, 2018

Abstract – The study presents results of investigating stabilization process for excess activated sludge, which is formed in abundance at municipal stations of biological water purification. A series of specific characteristics of initial samples of excess activated sludge (moisture, ash content, solids content, and density values) as well as its behavior in the sludge thickening process have been determined. Calcium and magnesium oxides have been applied for studying moisture-yielding properties of the sludge samples, the results make it possible to recommend using caustic lime (calcium hydroxide) as a sludge stabilizer. Changes in ash content of activated sludge samples treated with varying excess amounts of stabilizers are evaluated. A sedimentation curve (Kinsch curve) has been obtained, which allows to determine the precipitation ability of sludge particles and then to apply the data for calculating sedimentation tanks and adjusting their sizes in case of sediment swelling. The data obtained can be used to develop technology for dewatering sediments of biological treatment facilities with subsequent disposal of sediments.

Keywords: excess activated sewage sludge, sludge stabilizing treatment, lime, caustic lime, moisture-yielding and thermal properties, sedimentation.


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