Waste-activated sludge disruption by dry ice: bench scale study and evaluation of heat phase transformations

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dc.contributor.author Machnicka, Alicja
dc.contributor.author Grübel, Klaudiusz
dc.contributor.author Wacławek, Stanisław
dc.contributor.author Sikora, Krzysztof
dc.date.accessioned 2019-08-08T09:19:45Z
dc.date.available 2019-08-08T09:19:45Z
dc.date.issued 2019
dc.identifier.uri https://dspace.tul.cz/handle/15240/153191
dc.identifier.uri https://link.springer.com/article/10.1007%2Fs11356-019-05889-2
dc.description.abstract The freezing process consists of dissipating heat from the product until the final temperature is lower than the temperature of crystallisation of that product. Freezing can be used for numerous applications, including for disruption of waste-activated sludge (WAS). The aim of this study was to calculate the estimated amount of heat conveyed between the solidified carbon dioxide and the WAS, in the following ratios: 0.25:1; 0.5:1; 0.75:1 and 1:1. In heat of phase transformations, dry ice sublimation, water solidification, the amount of heat transferred by other substances and heat transferred from the sludge (dry sludge) were taken into account during the process of WAS freezing. Heat changes on the surface of WAS were registered using a thermovision camera. The effectiveness of WAS disintegration was confirmed by several biochemical parameters such as soluble chemical oxygen demand (increase over 14 times), degree of disintegration (48%), proteins (increase over 5 times), carbohydrates (increase almost 7 times), RNA (increase by 2.23 mg L−1), ammonia nitrogen (increase over 23 times), phosphates (increase almost 27 times) and turbidity (increased over 7 times). It was found that dry ice pretreatment of WAS can be an intriguing alternative for the conventional methods used. cs
dc.format.extent 12 stran cs
dc.language.iso cs cs
dc.relation.ispartof Environmental Science and Pollution Research
dc.subject Dry ice cs
dc.subject Waste-activated sludge cs
dc.subject Phase transformation processes cs
dc.subject Organic and inorganic matter cs
dc.subject Infrared radiation cs
dc.title Waste-activated sludge disruption by dry ice: bench scale study and evaluation of heat phase transformations cs
dc.identifier.doi 10.1007/s11356-019-05889-2

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