Effect of alkalization process on changes in the chemical composition of secondary sludge

• Autorzy: Marcinkowski T. A.
• Języki publikacji: EN

Abstrakty

EN

The paper addresses the problem of how the alkalization of partly dewatered (98.2% and 98.8% H2O) secondary sludge with a calcium hydroxide suspension influences the chemical composition of the organic fraction (which undergoes changes induced by hydrolysis processes). The process of sludge stabilization was assessed in terms of the COD/TOC ratio and the atomic O/C ratio. As a consequence of the hydrolysis processes, the content of proteins and fats as well as other organic substances (primarily simple acids) decreased, which manifested itself as a decrease of the oxygen and nitrogen content in the sludge being alkalized, and an increase in the value of the COD/TOC ratio, which was concomitant with a decrease in the atomic O/C ratio. It was found that treatment with low calcium hydroxide doses sufficed to stabilize the sludge. The products obtained are of no environmental nuisance and can be used for agricultural applications.

Słowa kluczowe

EN

calcium; hydrated lime; secondary sludge; sludge stabilization

PL

wapno hydratyzowane; wapno; osadnik wtórny; stabilizacja osadu; oczyszczanie ścieków

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Environment Protection Engineering
• Rocznik: 2010
• Tom: Vol. 36, nr 2
• Strony: 153--160
• Opis fizyczny: bibliogr. 11 poz.

Twórcy

autor

Marcinkowski T. A.

• Institute of Environmental Protection Engineering, Wrocław University of Technology, pl. Grunwaldzki 9, 50-377 Wrocław,

Bibliografia

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