Thermophilic and hyper-thermophilic co-digestion of waste activated sludge and fat, oil and grease: Evaluating and modeling methane production

Bioconversion of Egypt's Agricultural Wastes into Biogas and Compost

“…In order to avoid failure in the process of anaerobic digestion and to increase the yield of biogas, different AW streams must be mixed and treated together (co-fermented or co-digested) with industrial sludge or cattle slurry [27]. The potential benefits of co-digestion are the dilution of toxic compounds such as volatile fatty acids (VFAs) and NH 3 ; improving the balance of nutrients, improving the C:N ratio, and stabilizing digester performance by stabilizing the pH value [28][29][30] and increasing biogas yield [31]. The organic loading rate (OLR) is substrates fed per day per unit of digester volume and also defined as the amount of volatile solids (VS) or the chemical oxygen demand of substrates fed per day per unit of digester volume.…”

Enhancement of fermentative hydrogen production by Thermotoga maritima through hyperthermophilic anaerobic co-digestion of fruit-vegetable and fish wastes

“…Using hyperthermophilic co-digestion has several benefits. It increases the hydrolysis rate of the polymeric feedstock because hyperthermophilic hydrolytic enzymes have a highly stable activity with a better affinity to their substrates [27,28]. Therefore, the use of hyperthermophilic conditions has a positive effect on the solubilization of the cosubstrate mixture which is better for higher and faster production of hydrogen.…”

Effects of lipid concentration on thermophilic anaerobic co-digestion of food waste and grease waste in a siphon-driven self-agitated anaerobic reactor

“…This was probably due to the higher biodegradability of FW compared with SS. In addition, even higher VS removals under the thermophilic (70.6%–76.3%) and hyper-thermophilic (76.8%–86.0%) conditions were obtained in a completely stirred reactor [ 22 ]. These results indicated that, the SDSAR has a better solids-handling capacity in the co-digestion of GTW and FW compared with the completely stirring reactor under thermophilic condition.…”

“…Additionally, studies about co-digestion of lipid-rich wastes and other organic wastes often used mesophilic condition as it reduces cost related to heating [ 20 ]. Few studies have been conducted in the co-digestion of lipid-rich wastes with SS, and observed an improved biogas production under thermophilic condition [ 21 , 22 ]. In our previous study, the feasibility of using siphon-driven self-agitated anaerobic reactor (SDSAR) for the on-site FW treatment was evaluated, and the SDSAR has been demonstrated that there is better stability under thermophilic condition than mesophilic condition [ 23 ].…”