Study on the Effect of Hydrothermal Carbonization Parameters on Fuel Properties of Sewage Sludge Hydrochar

Abstract

In the wake of economic and population growth, increased wastewater production poses a challenge related to sewage sludge treatment, which is problematic given its high moisture content, amount, and hazardous characteristics. This study focuses on the hydrothermal carbonization of sewage sludge to produce carbonous material–hydrochar, which may be an alternative to fossil fuels. The effect of process parameters, namely, temperature (180, 240, 300 °C) and duration time (30, 90, 180 min), on hydrochar properties (proximate and ultimate analysis, heating values) and process performance were studied. Obtained results indicate and confirm that hydrothermal carbonization, especially temperature increase, improves the fuel properties of carbonized sewage sludge. The highest low heating value was obtained for hydrochar derived at 300 °C in 180 min (~23 MJ × kg−1). The highest energy gain was noted for hydrochar derived at 240 °C in 180 min (~23%). As well as relatively high mass and energy yield in comparison to other hydrochars, these parameters are considered the most favorable for sewage sludge hydrothermal carbonization. However, high energy consumption (over 1300 kJ × g−1) suggests that more research on the process’s economical efficacy is required.

Co-hydrothermal carbonization of pretreated sludge and polyethylene terephthalate for the preparation of low-nitrogen clean solid fuels

“…Additionally, the yield decreased significantly with increasing temperature as the degree of destruction of the SS cell structure increased, promoting the hydrolysis of proteins and carbohydrates in the SS and causing more organic matter to enter the liquid phase. 27 However, it can be observed that the yield and energy recovery (ER) rate of the pre-treated SS are significantly higher than those of the original SS. It is known that proteins are easily hydrolyzed into amino acids under hydrothermal conditions and eventually flow into the liquid phase after a series of ring-closing and rearrangement reactions, leading to a decrease in ER rate and yield.…”