Effect of pyrolysis temperature on polycyclic aromatic hydrocarbons toxicity and sorption behaviour of biochars prepared by pyrolysis of paper mill effluent treatment plant sludge

Effects of Pyrolysis Conditions on Physicochemical Properties of Oat Hull Derived Biochar

“…3). The present results are consistent with the studies reported by Devi and Saroha (2015) and Alburquerque et al (2015) for biochar produced from paper mill effluent treatment plant sludge and pinewood. Two of the predominant compounds detected in the present study (phenanthrene and pyrene) also were observed by the mentioned researchers, who used pyrolysis temperatures between 350 and 550 °C.…”

“…The temperature was the most significant variable that affected the results. In particular, the specific surface area was strongly affected, which became higher with higher temperatures (Yao et al 2012;Park et al 2013;Devi and Saroha 2015). The effect of the residence time was demonstrated by Klasson et al (2014), which showed that increasing the residence time from 120 to 240 min in the pyrolysis process carried out at 800 °C increased the specific surface area from 44 to 423 m 2 /g in the almond shell derived biochar.…”

“…The pyrolysis temperature causes chemical and physical changes to the feedstock, such as decreasing the H/C, O/C, and (N+O)/C ratios. For example, high temperatures increase the specific surface area (Devi and Saroha 2015) but decrease the amount of biochar produced, and they cause demethylation and decarboxylation reactions that result in high amounts of carbonized and aromatic structures (Chen et al 2014;Devi and Saroha 2015).…”

“…The presence of PAHs in biochar is a matter of concern because of their potential carcinogenic and mutagenic characteristics (Anjum et al 2014;Devi and Saroha 2015). Thus, the amount of these toxic constituents in the biochar determines the potential use of the material.…”

“…Currently, the principal reports addressing the effect of pyrolysis temperature, residence time, and raw material on the PAHs content are by Hale et al (2012), Keiluweit et al (2012), Devi and Saroha (2015), and Fu et al (2016). However, these parameters have been studied separately or not systematically.…”