Hydrothermal carbonization of pulp mill sludge : characterization and effects of liquid fraction recirculation
Banks, Jordan Blake (2021)
Diplomityö
2021
School of Energy Systems, Energiatekniikka
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2021060232731
https://urn.fi/URN:NBN:fi-fe2021060232731
Tiivistelmä
Hydrothermal carbonization (HTC) is a thermochemical conversion process in which biomass is transformed into a higher quality material with enhanced physical and chemical properties. HTC differs from other techniques in that it uses the moisture present in the biomass to catalyze the reactions, eliminating the need for the energy-intensive drying step. Products formed during HTC can be used in various applications such as energy recovery, soil amendment, and water treatment.
Wastewater and other industrial sludges have grown abundantly in the past years, stimulating a growing interest for environmental and economic disposal methods. In this master’s thesis, HTC was applied to pulp mill primary sludge and biosludge, and the liquid fraction of biosludge (HTC liquor) was recirculated up to four times. The results showed that HTC is most effective as a treatment for biosludge in improving its properties for energy and soil amendment. Recirculation did not have a significant effect, meaning HTC liquor could potentially be recycled in HTC to save water.
Wastewater and other industrial sludges have grown abundantly in the past years, stimulating a growing interest for environmental and economic disposal methods. In this master’s thesis, HTC was applied to pulp mill primary sludge and biosludge, and the liquid fraction of biosludge (HTC liquor) was recirculated up to four times. The results showed that HTC is most effective as a treatment for biosludge in improving its properties for energy and soil amendment. Recirculation did not have a significant effect, meaning HTC liquor could potentially be recycled in HTC to save water.