Hydrothermal carbonization of disposable diapers

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Title: Hydrothermal carbonization of disposable diapers
Authors: Budyk, Yuriy | Fullana, Andres
Research Group/s: Residuos, Energía, Medio Ambiente y Nanotecnología (REMAN)
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Química
Keywords: Hydrothermal carbonization | Waste diapers | Moisture elimination | Superabsorbent polymer | Diaper treatment | Disinfection
Knowledge Area: Ingeniería Química
Issue Date: Oct-2019
Publisher: Elsevier
Citation: Journal of Environmental Chemical Engineering. 2019, 7(5): 103341. doi:10.1016/j.jece.2019.103341
Abstract: Waste diapers compose 1.7% of solid urban waste. However, there is no specific treatment currently, since as the aim part of used diapers often ends up in a landfill. Since water represents more than 80% of the total weight of this waste, the main objective of this study is use hydrothermal carbonization to remove water from disposable diapers and produce a high calorific value hydrochar. Experiments were carried out for 3 h from 200 to 300 °C. The resultant gas was less than 1% while the hydrochar and liquid phase was around 10 and 90% of the total product mass, respectively. Analyses showed that hydrochars have greater properties in comparison with those of dry diaper, such as better combustion characteristics, and a high carbon content. The characterization of the liquid phase showed an important increase in conductivity (13–15 mS/cm), high COD (46–52 gO2/L) and a neutral pH. The last part of the experiment was aimed to realize HTC of used diapers simulated with synthetic urine and feces. No significant differences were found between hydrochars from previous experiments. The conductivity, and COD of the liquid phase evolved to 41 mS/cm and 100 gO2/L respectively. This research provides useful information for the design of HTC systems for diapers treatment.
URI: http://hdl.handle.net/10045/95507
ISSN: 2213-2929 (Print) | 2213-3437 (Online)
DOI: 10.1016/j.jece.2019.103341
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2019 Elsevier Ltd.
Peer Review: si
Publisher version: https://doi.org/10.1016/j.jece.2019.103341
Appears in Collections:INV - I4CE - Artículos de Revistas
INV - REMAN - Artículos de Revistas

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