Biogas production via anaerobic codigestion of chemically treated wheat straw with sewage sludge or cow manure

Effect of alkaline pretreatment on the characteristics of barley straw and modeling of methane production via codigestion of pretreated straw with sewage sludge

“…Siddiqi et al (2022) also detected a reduction in C, H, and N contents, as well as extraction of some minerals, due to wheat straw pretreatment with NaOH. As a result of the loss of these elements, the contents of other elements, such as Ca, Cu, Ni, Fe, Zn, Mn, Co, Mo, and S, increased, as reported previously (Jaffar et al 2016;Hassan et al 2017;Al-Da'asen et al 2022;Rani et al 2022). Moreover, a statistical analysis showed a significant difference between the T3 and T0 values for most parameters, and straw pretreatment with NaOH (T3) was associated with the greatest reductions in the reducing elements, followed by those of KOH (T2) and Na2CO3 (T1).…”

“…Greater VS consumption during anaerobic digestion indicates a greater maximum volume for biogas production. Pretreatment of the straw appeared to increase the biodegradation rates of organic compounds and maximize the consumption of VSs during the anaerobic digestion process, hence improving the process performance and increasing biogas production (Al-Da'asen et al 2022). The TS and VS results confirmed methane production from the different reactors, and the solid reduction percentages were proportional to the methane yields of the reactors (Alrowais et al 2023b).…”

“…Anaerobic codigestion of a feedstock resulted in a higher C/N ratio than straw (75.94±8.75), and a feedstock with a lower C/N ratio than sludge (7.01±0.32) increased the efficiency of biogas production due to the synergistic effect of the feedstocks. Moreover, mixing straw with sludge maintained the nutrient balance for healthy growth of the microorganisms essential for anaerobic digestion (Al-Da'asen et al 2022). The C/N ratio of the sludge (7.01±0.32) was increased to 12.27±0.23 by the addition of barley straw to the sludge.…”

Comparison of life cycle assessment of large-scale biogas projects with different raw materials in China

“…To explore the ultimate impact of biogas engineering with different raw materials on ecology, organic fertilizer is added to the residue disposal units, and biogas power generation is added to the Biogas purification units to form a new clean energy production unit. In Table 5, positive numbers indicate an adverse impact on the type of impact, while negative numbers have an improvement effect on the type of impact [67] . The ecological indices of human health for the two biogas projects are 37.834 and 26.234 Pt, respectively, which are not conducive to human health.…”