Process water properties from hydrothermal carbonization of chemical sludge from a pulp and board mill

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2018-09
Major/Subject
Mcode
Degree programme
Language
en
Pages
654-659
Series
Bioresource Technology, Volume 263
Abstract
Hydrothermal carbonization (HTC) can be used to break down sludge structure and generate carbonaceous hydrochar suitable for solid fuel or value-added material applications. The separation of char and the reaction medium however generates a filtrate, which needs to treated before potential discharge. Thus, this work determined filtrate properties based on HTC temperature and sludge moisture content and estimated the discharge emissions and the potential increase in analyte loads to an industrial wastewater treatment plant based on derived regression models. Direct discharge of HTC filtrate would significantly increase effluent emissions at the mill, indicating the filtrate treatment is crucial for the future implementation of HTC at pulp and paper mills. Recycling the HTC filtrate to the wastewater plant would lead to only a nominal increase in effluent flow, but would increase the suspended solids, BOD, COD and total nitrogen loads by 0.1–0.8%, 3.8–5.3%, 2.7–3.1% and 42–67%, respectively, depending on HTC temperature.
Description
Keywords
Biosolids, Experimental design, Hydrothermal treatment, Multiple linear regression, Principal component analysis, Wastewater treatment
Other note
Citation
Mäkelä , M , Forsberg , J , Söderberg , C , Larsson , S H & Dahl , O 2018 , ' Process water properties from hydrothermal carbonization of chemical sludge from a pulp and board mill ' , Bioresource Technology , vol. 263 , pp. 654-659 . https://doi.org/10.1016/j.biortech.2018.05.044