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• W2949488516 abstract "Electro-dewatering is an energy-efficient technology in which an electric field is applied to increase the dryness of secondary wastewater treatment waste biosolids from 15% w/w to 30-50% w/w. Electro-dewatering can also reduce bacterial pathogens content to below detection limits. However, in both of these cases, the mechanisms underlying the observed effects remain to be defined or confirmed. Thus, in this thesis, the factors affecting the limits of dewaterability, and the rate and energy efficiency of water removal were investigated. A laboratory scale electro-dewatering unit was used with dewatering cycles of 8-12 min. Due to Joules heating, electrolysis and electro-migration, the temperature of the dewatering cake increased rapidly and the pH decreased. The high temperatures increased the dewatering rate, but did not have a significant impact on the dewatering efficiency. Reduction of the pH just above the isoelectric point increased the dewatering rate, while an increase in ionic strength reduced the dewatering efficiency. Finally, the limits to dewaterability were explained by the reduction of water activity and pH close to the anode, which reduced the electrical conductivity and reversed electro-osmotic flow. Beyond the impacts on biosolids dewatering properties, high temperature and low pH developed during electro-dewatering also affected the microbiological qualities of the treated biosolids. At temperatures above 75 °C, total coliforms and Escherichia coli (bacterial pathogen indicators) were inactivated to below the detection limits. The production of chemical oxidants and the reduction of pH were also investigated, but they did not seem to contribute significantly to the inactivation. Therefore, Joule heating was the main factor leading to microbial inactivation. Conversely, the low pH developed during electro-dewatering was found to be the main factor controlling the regrowth of bacterial pathogen indicators over 7 d in both aerobic and anaerobic conditions. Similarly, the olfactometric and chemical analyses of the headspace above incubated electro-dewatered biosolids showed a reduction of offensive odour concentrations, which were caused by the lower pH.Knowledge on the impact of Joule heating and pH on electro-dewatering helps improve the dewatering, and reduce the costs of processing, transport and disposal of biosolids. Findings demonstrated that electro-dewatering produces biosolids with lower microbial counts and odour levels after storage. This could help establish electro-dewatering as a feasible dewatering technology that produces biosolids with microbiological standards for land application.%%%%L'electro-deshydratation est une technologie a haut rendement energetique, dans lequel un champ electrique est applique pour augmenter la siccite des dechets de biosolides provenant des traitements secondaires des eaux usees de 15% poids/poids a 30-50% poids/poids. L'electro-deshydratation peut egalement reduire la teneur en bacteries pathogenes en dessous des limites de detection. Toutefois, dans les…" @default.
• W2949488516 created "2019-06-27" @default.
• W2949488516 creator A5052100378 @default.
• W2949488516 date "2015-01-01" @default.
• W2949488516 modified "2023-09-23" @default.
• W2949488516 title "Electro-dewatering process parameters affecting dewaterability and microbiological quality of residual biosolids" @default.
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