Molecular and microbial insights towards understanding the anaerobic digestion of the wastewater from hydrothermal liquefaction of sewage sludge facilitated by granular activated carbon (GAC)

Hydrochar derived from municipal sludge through hydrothermal processing: A critical review on its formation, characterization, and valorization

“…Simply return HTL aqueous to the WWTP headworks would significantly increase aeration cost and may lead to toxicity impacts and exceed discharge limits due to high ammonia concentrations. Many studies have proposed to valorize HTL aqueous by AD, with a specific methane yield of 36-259 mL CH 4 /g COD (Hao et al, 2020;Posmanik et al, 2017b;Usman et al, 2019bUsman et al, , 2020P. Wang et al, 2021).…”

“…Therefore, efficient treatment of HTL aqueous is considered the critical step in HTL-AD configuration. Studies have shown that adding granular activated carbon (Usman et al, 2019b) and hydrochar (Usman et al, 2020) to diluted HTL aqueous for AD could improve methane yield by up to 30 and 52%, respectively, due to enhanced degradation of aromatic, N-heterocyclic, and phenolic compounds. A promising treatment was achieved by , who used struvite precipitation for ammonia removal (82%) and biochar for phenols removal (70%) and reached a specific methane yield up to 225 mL CH 4 /g COD from non-diluted HTL aqueous by mesophilic AD, while only struvite precipitation could achieve a specific methane yield up to 115 mL CH 4 /g COD.…”

Biogas Production from Oil Palm Empty Fruit Bunches and Palm Oil Decanter Cake using Solid-State Anaerobic co-Digestion

“…In addition, as clearly demonstrated in Figure 3a, diversity of the predominantly bacterial community under thermophilic conditions was higher than that under mesophilic conditions. High bacterial diversity enhance digestibility of complex substrates [38]. Therefore as mentioned previously mentioned in Table 2, considerably high hydrolysis constant and short lag time obtained from SS-AcoD of EFB with DC under thermophilic condition could be also contributed from high microbial diversity.…”

Continuous Anaerobic Digestion of Wood Vinegar Wastewater From Pyrolysis: Microbial Diversity and Functional Genes Prediction

“…Additionally, the microbial community structures were directly related to the degradation efficiency of the organic wastewater. Microbial community analysis revealed high amounts of bacteria capable of degrading N-heterocyclic and aromatic compounds such as Syntrophorhabdus and Synergistes (Usman et al, 2019). Si et al (2016) also reported numerous microorganisms associated with acidification and detoxification in long-term continuous AD experiments.…”

“…Diverse methods have been employed to improve the anaerobic methanogenic potential of HTLWW including physical absorption, photocatalytic oxidation, and ozonation. Several studies have also revealed that physical adsorbents such as activated carbon and zeolite increase the cumulative methane yield and mitigate inhibition by toxicants (Zheng et al, 2016;Usman et al, 2019). Photocatalyzed HTLWW can enhance methane production and the COD removal rate, increasing the total energy recovery to 66.7% (Quispe-Arpasi et al, 2018).…”