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

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dc.contributor.authorMachnicka, Alicja
dc.contributor.authorGrübel, Klaudiusz
dc.contributor.authorWacławek, Stanisław
dc.contributor.authorSikora, Krzysztof
dc.date.accessioned2019-08-08T09:19:45Z
dc.date.available2019-08-08T09:19:45Z
dc.date.issued2019
dc.description.abstractThe 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.extent12 strancs
dc.identifier.doi10.1007/s11356-019-05889-2
dc.identifier.urihttps://dspace.tul.cz/handle/15240/153191
dc.identifier.urihttps://link.springer.com/article/10.1007%2Fs11356-019-05889-2
dc.language.isocscs
dc.relation.ispartofEnvironmental Science and Pollution Research
dc.subjectDry icecs
dc.subjectWaste-activated sludgecs
dc.subjectPhase transformation processescs
dc.subjectOrganic and inorganic mattercs
dc.subjectInfrared radiationcs
dc.titleWaste-activated sludge disruption by dry ice: bench scale study and evaluation of heat phase transformationscs
local.identifier.publikace6822
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