This study aimed to investigate potential methane production through anaerobic co-digestion of rice straw and digested swine manure with different total solids.The research was carried out in bench scale with utilizin...This study aimed to investigate potential methane production through anaerobic co-digestion of rice straw and digested swine manure with different total solids.The research was carried out in bench scale with utilizing batch system.To evaluate the stability of anaerobic co-digestion process,the experiment was run in triplicate.The anaerobic co-digestion process was operated in 500 mL batch digesters under constant agitation speed and temperature.The agitation speed was maintained at 270 r/min.Temperature of the batch system was set and maintained at 35℃.Digested swine manure utilized in this experiment was obtained from semi-continuous digesters run at steady state condition,with 25 days of hydraulic retention time under mesophilic condition.Rice straw(RS)generated the highest methane production at 3% total solids(TS)which was around(1814±47.43)mL,where in this concentration,it had C:N ratio at 10.6:1.Rice straw obtained the highest methane yield at 3% TS,which was around(141.4±3.70)mL CH_(4)/g volatile solids(VS)added.Rice straw also had the highest chemical oxygen demand(COD)removal and VS reduction at 3% TS which were around(52.97%±1.46%)and(61.81%±1.04%),respectively.展开更多
Residual antibiotics in chicken manure may interfere with the stability of anaerobic digestion(AD)and inhibit resource utilization efficiency.In this study,we aimed to enhance chicken manure bio-methanation in AD with...Residual antibiotics in chicken manure may interfere with the stability of anaerobic digestion(AD)and inhibit resource utilization efficiency.In this study,we aimed to enhance chicken manure bio-methanation in AD with highconcentration of sulfamethazine(SMZ)by adding metal(Fe,Co)-modified Enteromorpha-based hydrochar(Co-HC,Fe-HC).The results showed that Fe-HC and Co-HC increased the degree of acidogenesis by 1.25 times and 1.58 times,respectively.The maximum protein concentration in EPS was increased by 47.64%and 72.5%after adding Fe-HC and Co-HC.However,only Co-HC demonstrated notable improvements in both methane production and SMZ removal efficiency.Electrochemical analysis showed that Co-HC possessed a richer variety of oxygen and nitrogen functional groups,along with superior electron exchange capabilities compared to Fe-HC.Furthermore,microbiological assessments revealed that Co-HC enriched syntrophic bacteria(such as Syntrophomonas and Mesotoga),facilitating direct interspecies electron transfer(DIET)and subsequently enhancing biomethane production.The abundance of genes involved in electron transfer increased significantly with Co-HC,with a maximum increase of 75.86%in Co1.5-HC treatment.Additionally,the elimination of antibiotic resistance genes(sul1,sul2)increased by 65.66%in the Co1.5-HC treatment.This study offers a theoretical foundation and empirical support for the synergistic improvement of livestock and poultry manure containing high antibiotic concentrations,thereby helping to overcome challenges posed by recalcitrant substances.展开更多
Biogas production is a well-established technology primarily for the generation of renewable energy and also for the valorization of organic residues. Biogas is the end product of a biological mediated process, the so...Biogas production is a well-established technology primarily for the generation of renewable energy and also for the valorization of organic residues. Biogas is the end product of a biological mediated process, the so called anaerobic digestion, in which different microorganisms, follow diverse metabolic pathways to decompose the organic matter. The process has been known since ancient times and was widely applied at domestic households providing heat and power for hundreds of years. Nowadays, the biogas sector is rapidly growing and novel achievements create the foundation for constituting biogas plants as advanced bioenergy factories. In this context, the biogas plants are the basis of a circular economy concept targeting nutrients recycling, reduction of greenhouse gas emissions and biorefinery purposes. This review summarizes the current state-of-the-art and presents future perspectives related to the anaerobic digestion process for biogas production. Moreover, a historical retrospective of biogas sector from the early years of its development till its recent advancements gives an outlook of the opportunities that are opening up for process optimisation.展开更多
基金funding the program in the Department of Biological and Agricultural Engineering,North Carolina State University(NCSU).
文摘This study aimed to investigate potential methane production through anaerobic co-digestion of rice straw and digested swine manure with different total solids.The research was carried out in bench scale with utilizing batch system.To evaluate the stability of anaerobic co-digestion process,the experiment was run in triplicate.The anaerobic co-digestion process was operated in 500 mL batch digesters under constant agitation speed and temperature.The agitation speed was maintained at 270 r/min.Temperature of the batch system was set and maintained at 35℃.Digested swine manure utilized in this experiment was obtained from semi-continuous digesters run at steady state condition,with 25 days of hydraulic retention time under mesophilic condition.Rice straw(RS)generated the highest methane production at 3% total solids(TS)which was around(1814±47.43)mL,where in this concentration,it had C:N ratio at 10.6:1.Rice straw obtained the highest methane yield at 3% TS,which was around(141.4±3.70)mL CH_(4)/g volatile solids(VS)added.Rice straw also had the highest chemical oxygen demand(COD)removal and VS reduction at 3% TS which were around(52.97%±1.46%)and(61.81%±1.04%),respectively.
基金supported by the National High Technology Research and Development Program of China(2022YFC3700187)National Natural Science Foundation of China(U1806216 and 51608304)Young Scholars Program of Shandong University(2018WLJH53).
文摘Residual antibiotics in chicken manure may interfere with the stability of anaerobic digestion(AD)and inhibit resource utilization efficiency.In this study,we aimed to enhance chicken manure bio-methanation in AD with highconcentration of sulfamethazine(SMZ)by adding metal(Fe,Co)-modified Enteromorpha-based hydrochar(Co-HC,Fe-HC).The results showed that Fe-HC and Co-HC increased the degree of acidogenesis by 1.25 times and 1.58 times,respectively.The maximum protein concentration in EPS was increased by 47.64%and 72.5%after adding Fe-HC and Co-HC.However,only Co-HC demonstrated notable improvements in both methane production and SMZ removal efficiency.Electrochemical analysis showed that Co-HC possessed a richer variety of oxygen and nitrogen functional groups,along with superior electron exchange capabilities compared to Fe-HC.Furthermore,microbiological assessments revealed that Co-HC enriched syntrophic bacteria(such as Syntrophomonas and Mesotoga),facilitating direct interspecies electron transfer(DIET)and subsequently enhancing biomethane production.The abundance of genes involved in electron transfer increased significantly with Co-HC,with a maximum increase of 75.86%in Co1.5-HC treatment.Additionally,the elimination of antibiotic resistance genes(sul1,sul2)increased by 65.66%in the Co1.5-HC treatment.This study offers a theoretical foundation and empirical support for the synergistic improvement of livestock and poultry manure containing high antibiotic concentrations,thereby helping to overcome challenges posed by recalcitrant substances.
文摘Biogas production is a well-established technology primarily for the generation of renewable energy and also for the valorization of organic residues. Biogas is the end product of a biological mediated process, the so called anaerobic digestion, in which different microorganisms, follow diverse metabolic pathways to decompose the organic matter. The process has been known since ancient times and was widely applied at domestic households providing heat and power for hundreds of years. Nowadays, the biogas sector is rapidly growing and novel achievements create the foundation for constituting biogas plants as advanced bioenergy factories. In this context, the biogas plants are the basis of a circular economy concept targeting nutrients recycling, reduction of greenhouse gas emissions and biorefinery purposes. This review summarizes the current state-of-the-art and presents future perspectives related to the anaerobic digestion process for biogas production. Moreover, a historical retrospective of biogas sector from the early years of its development till its recent advancements gives an outlook of the opportunities that are opening up for process optimisation.
