The characteristics of sewage sludge pellet biochar prepared using two different pyrolysis methods

Biochar for Soil Carbon Sequestration: Current Knowledge, Mechanisms, and Future Perspectives

“…This is attributed to the decreased volatility of PTEs within biochar and their concentration in the residual ash, which differs from the elevated emissions often associated with coal or coke conversion processes utilized in ironmaking [144,146]. Additionally, the leaching and bioavailability of toxic trace elements in biochar are less likely, especially in cases of higher pH [39], which are generally alkaline for most biochar instances, rendering trace elements immobile. However, the mobility of oxyanions cannot be entirely discounted [147].…”

Phosphate adsorption from water and wastewater using non-devulcanised and devulcanised tyre rubber

“…A comparison of the capacity of other sorbents to sorb phosphorus from aqueous solutions is shown as follows: Waste concrete (modified by thermal stress method) indicated a sorption capacity of 1.1–5.0 mg/g [ 37 ], pelleted sewage sludge biochar (measuring 1–2 mm) indicated a maximum adsorption capacity of 1.04 mg/g for P [ 38 ], 1 g of quartz sand grains covered with an oxide-coated filter medium accumulated 0.84 mg of PO 4 –P [ 39 ], and ground burnt patties (solid waste generated from cooking fuel) indicated a sorption capacity of 0.41 mg/g [ 35 ]. Filtration occurred at a relatively high flow rate of 0.75 m/h (1.2 L/h) in this study, and the solution remained in the filter media for only 15 min.…”

Evaluation of Sewage Sludge Biochar Use in Wastewater Treatment From Phosphate

“…The porous structure and specific surface area of biochar play an important role in adsorption (Agrafioti et al, 2013;Hossain et al, 2011;Januševičius et al, 2022;Lu et al, 2013;Yin et al, 2019). On this basis, the variation of the chosen sewage sludge biochar pyrolysis temperatures was used to determine the effectiveness of adsorption.…”

“…Meanwhile, when comparing the different initial phosphate concentration of pH values, it was found that the higher the pH value, the higher the sorption capacity values were recorded (highest values with 600 °C pH = 8.2, q e = 6 (at 100 mg/l) and q e = 2.6 (at 50 mg/l)). The pH of the solution increases because sewage sludge pyrolysis at 600 °C increases the concentration of alkali metals (Januševičius et al, 2022). Therefore, the higher the temperature of the pyrolyzed sludge, the higher its pH.…”

“…Municipal sewage sludge was taken from a municipal wastewater treatment plant which was located in Vilnius city (Lithuania). Biochar was prepared by pyrolysis in a tube furnace method (Januševičius et al, 2022). The pyrolysis was chosen to temperatures of 300 °C, 400 °C, 500 °C, and 600 °C.…”