Primary sludge stabilisation with calcium hydroxide |
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| Authors: | Franciszek Czechowski Tadeusz Marcinkowski |
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| Institution: | (1) Institute of Environment Protection Engineering, Wroclaw University of Technology, 9 Grunwaldzki Pl., 50-377 Wroclaw, Poland |
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| Abstract: | We studied the effect of the addition of calcium hydroxide to primary raw sludges. Calcium hydroxide enhances ammonia release
as well as proteins and fats hydrolysis from the sludge organic material during stabilisation process. Changes in the molecular
composition of the sludge extractable lipids caused by calcium hydroxide suspension, analysed using gas chromatography interfaced
to mass spectrometry detector, are discussed. Calcium hydroxide treatment selectively removes fatty acids from the sludge
lipids, while it has little effect on removal and molecular assemblage of the stanol and sterol compounds during sludge stabilisation.
Biogenic n-alkanes are minor components in the sludge lipids. |
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| Keywords: | Primary sludge Calcium hydroxide Stabilisation Fatty acids Stanols and sterols |
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