Influence of pyrolysis temperature on chemical and physical properties of biochar from sewage sludge

Biochar and Trichoderma harzianum for the Control of Macrophomina phaseolina

“…Increased salinity in the PDA culture medium, resulting from the addition of NaCl + CaSO4 or CaSO4, stimulated the development and infection of two M. phaseolina isolates [18]. Biochars produced at 500 ºC presented higher values of electrical conductivity (EC) than those produced at lower temperatures [19]. The possible increase in EC of the PDA culture medium after addition of sewage sludge BCH may be related to the stimulus of mycelial growth of the M. phaseolina fungus observed in the experiment.…”

“…Moreover, with low C/N ratio (Table 2), BCH may have served as a substrate for the development of M. phaseolina when doses higher than 1% were applied. Although predominantly composed of recalcitrant carbon, BCH also exhibits readily decomposable compounds [19] which can be used for microbial growth.…”

Carbon Mineralization in a Soil Amended with Sewage Sludge-Derived Biochar

“…Similarly to our results, in a previous study by Abdulrazzaq et al [39], the pyrolysis temperatures had a great influence on the biochar's stability, which was indicated by the nature of the C structures. The low CMR was attributed to increasing aromatic C (benzene-like rings), which have extra stability in the soil, to an effective structural change that favors the appearance of turbostratic-C crystallites molecules [40], and to the higher silica content (Si-O stretching instead of organic C-OH stretching of carbohydrates) [18] with increasing pyrolysis temperature. Zimmerman [14], studying a range of biochars produced from different feedstocks and at several temperatures, noted that C-CO 2 release from abiotic incubations was 50-90% of that of inoculated (biotic) incubations, and both generally decreased with increasing pyrolysis temperatures.…”

“…For example, the application of biochar with low available nitrogen (N) to soil may increase the half-life of C in soil due to a decrease in C mineralization rates [17]. Moreover, if the objective of applying biochar to soil is to increase soil fertility, then low pyrolysis temperature biochar may be more suitable because of its higher rates of C and nutrient mineralization in soil [17,18].…”

Enhancing Anaerobic Digestion: The Effect of Carbon Conductive Materials

“…Different feedstocks serve as raw materials for obtaining biochar, as it is; organic wastes derived from agriculture and forestry, or urban wastes including sewage sludge [118]. However, its properties are greatly dependent on the feedstock used and the process conditions (temperature, atmosphere and heating rate) [119,120].…”