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Quantity and quality of biogas produced from the poultry sludge optimized by filamentous fungi

Wrońska I., Cybulska K.

Ecological Chemistry and Engineering. S

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2018

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Vol. 25, nr 3

395--404

EN

One of the methods for recovery and utilization of waste products from the poultry industry is to subject them to the methane fermentation process in the biogas plant. These are waste with a high content of fatty compounds and proteins, including keratin. Their specificity is characterized by rapid possibility of spoilage, rancidity and problems of further management. These wastes are characterized by varying degrees of complexity, thus their use as a raw material for the biogas fermenter should be preceded by a pre-treatment. An example of waste generated in poultry processing is biological sludge. Optimizing this material with highly enzymatic fungi could accelerate the degradation of the organic matter contained and, as a result, increase the energy efficiency of this type of waste. Quantitative and qualitative parameters of biogas produced from biological sludge processed by isolated filamentous fungi with high metabolic potential were determined. Laboratory tests were based on the modified methodology included in the standards DIN 38414-S8 and VDI 4630. Based on the results obtained, it was found that the pre-optimization of biological sludge by fungal strains with different metabolic potential, influences on the yield of biogas production, including methane. There was an increase in the biogas yield from the biological sludge processed by the mixed fungal consortium (by 20 %) and the strain marked as F1 (by 14 %) as compared to the non-inoculated material, which was also reflected in the amount of methane produced in the case of the mixed fungal consortium (by 28 %) and the strain marked as F1 (by 12 %).

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Przeróbka osadów biologicznych w polu ultradźwięków

Fryźlewicz-Kozak B.

Przemysł Chemiczny

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2014

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T. 93, nr 8

1475-1476

PL

Energię ultradźwięków można zastosować do wstępnej obróbki osadów w celu dezintegracji kłaczków osadu ściekowego i rozerwania ścian komórek bakterii, co powoduje uwalnianie substancji rozpuszczalnych. W wyniku tego wzrasta chemiczne zapotrzebowanie na tlen w fazie ciekłej oraz uzyskuje się zmniejszenie ilości suchej masy osadu. Badano zmiany tych parametrów wraz ze wzrostem energii właściwej.

EN

Activated sludge was treated with ultrasonic waves (22 kHz, 24–64 kW/m², 12 GJ/kg dry mass, 75–201 kW/m³) for 300 s under lab. conditions. A substantial increase in chem. O₂ demand in the supernatant and decrease in content of total solids were found. A considerably increase in the sludge temp. was also obsd. The results agreed with the data given by V. Naddeo et al. (2009).

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Mechanism of behaviour of biological sludge in an ultrasonic field

Fryźlewicz-Kozak B., Tal-Figiel B.

Czasopismo Techniczne. Mechanika

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2008

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R. 105, z. 5-M

111-120

EN

This paper deals with studies of changes in structure and size of activated sludge flocs from municipalindustrial treatment plants in a function of parameters of ultrasounds (i.e. ultrasound field intensity and time of ultrasound application). Different methods of determining of fractal dimension were presented.

PL

W artykule omówiono mechanizm zachowania się osadów biologicznych i zachodzące zmiany w strukturze i w rozmiarze kłaczków osadów biologicznych w funkcji parametrów pola ultradźwiękowego (tj. natężenia pola ultradźwiękowego i czasu jego działania). Przedstawiono różne metody wyznaczania wymiaru fraktalnego.