Influence of temperature on product distribution and biochar properties by municipal sludge pyrolysis

Distribution and Contamination Hazards of Heavy Metals in Solid Residues from the Pyrolysis and Gasification of Wastewater Sewage Sludge

“…For the other HMs, their residual rates were all over 70%, which indicated that most of the HMs remained in the solid residues after pyrolysis and gasification treatment. The obtained results are similar to other research findings showing that HMs in SS are concentrated in residue fractions following pyrolysis [25][26]44]. It is also observed that the operation temperature influenced the residual rate of HMs to a different extent.…”

“…It was denoted to characterize the environmental ecological risk resulting from the distribution of HMs, which was obtained by the following Equations (2), (3) and (4) [28,33,34,36]. Where, C f i is the pollution index of each HM; C d i is the measured concentration of bioavailable HMs in SS and PR1, 2, 3 and GR; C R i is the reference value of individual HMs defined as B n ; E R i is the monomial potential ecological risk factor; T R i is the toxic response factor of each HM, and the value is in the order of Zn = 1 < Cr = 2 < Cu = Ni = Pb = 5 < Cd = 30 [44].…”

The stabilization of tannery sludge and the character of humic acid-like during low temperature pyrolysis

“…The stability of the tannery sludge differ largely according to the numerous and the complex organic component it contains. On the one hand, characteristics of the aromaticity in the chars during pyrolysis can be used to characterize the stability of the char, because high aromaticity can resist decomposition (Yuan et al, 2013). On the other hand, the humification of tannery sludge can be used as a method of evaluation on the stability of organic matter.…”

The role of biochar on greenhouse gas offsets, improvement of soil attributes and nutrient use efficiency in tropical soils

“…the reduction of N 2 O to N 2 ) by acting as an "electron shuttle" that facilitates the transfer of electrons to soil denitrifying microorganisms. Other studies have found that catalytic reactions between metal ions present in BC surface and either N O Additionally, the formation of biofilms on the surface of BC may lead to the oxidation of organic matter and CH 4 and transfer of the electrons produced from these reactions to the BC if the environment is anoxic, affecting the rate of reduction of N 2 O to N 2 (YUAN et al, 2013). Finally, the mean daily and cumulative CH 4 fluxes observed in this study were negligible compared with the existing literature, indicating that there were no significant effects of the treatments evaluated and soil matrixes on net CH 4 fluxes (Figures 3.1 and 3.2).…”

“…Numerous studies have shown that surface area tends to increase with pyrolysis temperature (VERHEIJEN et al, 2010). This is most often associated with physical and chemical changes, such as the removal of H and O containing functional groups (ZHAO et al, 2013) and thermal decomposition of cellulose and lignin (CHEN et al, 2012).…”