Towards optimization of the total solid content in high-solid (dry) municipal solid waste digestion

Sequential batch thermophilic solid-state anaerobic digestion of lignocellulosic biomass via recirculating digestate as inoculum – Part I: Reactor performance

“…Additionally, substrate-toinoculum (S/I) ratios of 0.4-0.6 (TS basis) were shown to minimize treatment costs (Di Maria et al, 2012). Benbelkacem et al (2015) evaluated the effect of TS content on a continuous SS-AD of MSW employing an initial S/I ratio of 0.8 (w/w), corresponding to 1.7-3.9 based on TS.…”

“…Results showed that the highest volumetric productivity was achieved with about 22% TS for the materials in the reactor (Benbelkacem et al, 2015). The need to treat lignocellulosic biomass has raised interests in SS-AD under thermophilic condition.…”

Comparison of digestate from solid anaerobic digesters and dewatered effluent from liquid anaerobic digesters as inocula for solid state anaerobic digestion of yard trimmings

“…It was reported that in commercial SS-AD digesters, about 50%-70% (wet based)of the finished solid materials (digestate) need to be recycled as inoculum, significantly reducing digester volume for feedstocks (Karthikeyan and Visvanathan, 2013). A recent lab scale studyon continuous SS-AD useda digestate recycling ratio (by fresh weight) of around 55%, and found that aTS content of about 26% and above would cause volatile fatty acid (VFA) accumulation anda pH drop (Benbelkacem et al, 2015). However, currently very limited information can be found for the optimal substrate to inoculum (S/I) ratio and the operating TS contentusing recycled digestate as inoculum.…”

Comparative analysis of common full scale reactors for dry anaerobic digestion process

“…In the case of pH decline, the reactor operates at batch mode until pH recovered then continuous feeding regime start again. The stirring process occurs by biogas reinjection to the reactor with high pressure of 5 bar at the bottom of the reactor [24,25] Data collected from real installed reactors of each type have been displayed in Fig. 5 [22,23], which presented the relation between the annual biogas productions versus the capacity of the reactor.…”