Molasses as a carbon source for denitrification

• Autorzy: Kulikowska D. , Dudek K.

Warianty tytułu

PL

Melasa jako źródło węgla w procesie denitryfikacji

• Języki publikacji: EN

Abstrakty

EN

The paper presents the results of an experiment with sugar-industry waste (molasses) as an organic carbon source for denitrification. The investigations concern the influence of untreated molasses and molasses after pretreatment (hydrolyzed molasses) and variable COD/N ratio (6.0; 5.0; 4.0) on denitrification efficiency and kinetics. Moreover, sludge production, in dependence on tested carbon source, was estimated. At COD/N ratio 6 and 5, regardless of applied organic carbon source (untreated molasses, hydrolyzed molasses), the denitrification efficiency was over 98%. However, from kinetic analysis it results that a kind of carbon source and COD/N ratio have an effect on denitrification rate. The highest nitrate removal rate - 9.5 mg NNOx/(dm3źh) was obtained at COD/N = 6 in the reactor with hydrolyzed molasses as a carbon source and the lowest - 5.14 mg NNOx/(dm3źh) in reactor with untreated molasses at COD/N = 5.0. The lowering of COD/N ratio to 4 caused decrease of the process efficiency to 27.6% (untreated molasses) and 44.3% (hydrolyzed molasses). Hydrolyzed molasses as a carbon source caused higher production of activated sludge. In reactors with untreated molasses Yobs equals 0.40 mg VSS/mg COD at COD/N ratio 6 and 0.31 mg VSS/mg COD at COD/N ratio 5. In reactors with molasses after hydrolysis Yobs were 1.35-fold and 1.5-fold higher, respectively. Since, the molasses hydrolysis results in rising costs of wastewater treatment and cause higher sludge production, untreated molasses seems to be a more suitable carbon source for denitrification.

PL

Praca zawiera wyniki badań dotyczące możliwości wykorzystania melasy - produktu odpadowego powstającego w przemyśle cukrowniczym - jako źródła węgla organicznego w procesie denitryfikacji. Badano wpływ hydrolizy melasy oraz stosunku ChZT/N (6,0; 5,0; 4,0) na efektywność i kinetykę procesu. Określono również przyrost osadu czynnego w zależności od rodzaju źródła węgla (melasa, melasa zhydrolizowana) oraz stosunku ChZT/N. Przy stosunku ChZT/N wynoszącym 6,0 i 5,0, niezależnie od formy występowania źródła węgla organicznego (melasa, melasa zhydrolizowana), efektywność denitryfikacji przekraczała 98%. Badania kinetyki procesu wykazały natomiast, że rodzaj źródła węgla oraz stosunek ChZT/N wpływały na szybkość denitryfikacji. Najwyższą szybkość procesu - 9,5 mg NNOx/(dm3źh) odnotowano przy ChZT/N wynoszącym 6,0 w reaktorze z melasą zhydrolizowaną a najniższą - 5,14 mg NNOx/(dm3źh) w reaktorze z melasą niezhydrolizowaną przy ChZT/N wynoszącym 5,0. Obniżenie stosunku ChZT/N do 4,0 spowodowało spadek efektywności procesu do 27,6% (melasa niezhydrolizowana) oraz 44,3% (melasa zhydrolizowana). Zastosowanie melasy zhydrolizowanej powodowało wyższy przyrost osadu czynnego. W reaktorach, gdzie źródłem węgla była melasa.

Słowa kluczowe

EN

SBR; denitrification process; molasses; hydrolyzed molasses; observed biomass yield coefficient

PL

reaktor SBR; denitryfikacja; melasa; hydroliza melasy; współczynnik wydajności biomasy

• Wydawca: Institute of Environmental Engineering, Polish Academy of Sciences
• Czasopismo: Archives of Environmental Protection
• Rocznik: 2010
• Tom: Vol. 36, no. 2
• Strony: 35--45
• Opis fizyczny: bibliogr. 27 poz., tab., wykr.

Twórcy

autor

Kulikowska D.

autor

Dudek K.

• University of Warmia and Mazury in Olsztyn, Department of Environmental Biotechnology ul. Słoneczna 45G, 10-907 Olsztyn-Kortowo, Poland,

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