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Open AccessArticle

Investigation of a Gas Hydrate Dissociation-Energy-Based Quick-Freezing Treatment for Sludge Cell Lysis and Dewatering

School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
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Int. J. Environ. Res. Public Health 2019, 16(19), 3611; https://doi.org/10.3390/ijerph16193611
Received: 29 August 2019 / Revised: 17 September 2019 / Accepted: 23 September 2019 / Published: 26 September 2019
(This article belongs to the Collection Municipal Wastewater Treatment and Sludge Treatment and Disposal)
A gas Hydrate dissociation-energy-based Quick-Freezing treatment (HbQF) was applied for sewage sludge cell rupture and dewatering. Carbon dioxide (CO2) and water (H2O) molecules in sewage create CO2 gas hydrates, and subsequently the sludge rapidly freezes by releasing the applied pressure. Cell rupture was observed through a viability evaluation and leachate analysis. The decreased ratios of live cell to dead cells, increased osmotic pressure, and increased conductivity showed cell lysis and release of electrolytes via HbQF. The change in physicochemical properties of the samples resulting from HbQF was investigated via zeta potential measurement, rheological analysis, and particle size measurement. The HbQF treatment could not reduce the sludge water content when combined with membrane-based filtration post-treatment because of the pore blocking of fractured and lysed cells; however, it could achieve sludge microbial cell rupture, disinfection, and floc disintegration, causing enhanced reduction of water content and enhanced dewatering capability via a sedimentation post process. Furthermore, the organic-rich materials released by the cell rupture, investigated via the analysis of protein, polysaccharide, total organic carbon, and total nitrogen, may be returned to a biological treatment system or (an) aerobic digester to increase treatment efficiency. View Full-Text
Keywords: gas hydrate dissociation energy; quick freezing; sewage sludge; cell lysis; dehydration gas hydrate dissociation energy; quick freezing; sewage sludge; cell lysis; dehydration
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Kim, W.; Lee, H.K.; Kwon, Y.-N. Investigation of a Gas Hydrate Dissociation-Energy-Based Quick-Freezing Treatment for Sludge Cell Lysis and Dewatering. Int. J. Environ. Res. Public Health 2019, 16, 3611.

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