Biological pretreatment enhances the activity of functional microorganisms and the ability of methanogenesis during anaerobic digestion

2019 ◽  
Vol 290 ◽  
pp. 121660 ◽  
Author(s):  
Yiquan Zhao ◽  
Congfeng Xu ◽  
Shiqi Ai ◽  
Haipeng Wang ◽  
Yamei Gao ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Biological Pretreatment

scholarly journals Enhancement of Food Waste Management and Its Environmental Consequences

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1790
Author(s):  
Jan den Boer ◽  
Gudrun Obersteiner ◽  
Sebastian Gollnow ◽  
Emilia den Boer ◽  
Renata Bodnárné Sándor
Keyword(s):  
Anaerobic Digestion ◽  
Waste Management ◽  
Environmental Effects ◽  
Ghg Emissions ◽  
Primary Energy ◽  
Biological Pretreatment ◽  
Environmental Benefit ◽  
Kitchen Waste ◽  
Considerable Saving ◽  
Positive Effects

This paper assesses the potential environmental effects of the optimization of the kitchen waste management in Opole. The separate collection of kitchen waste is improved by distribution of separate collection kits consisting of an in-home bin and 10 L biodegradable bags. The surplus of collected kitchen waste is diverted from treatment in a mechanical-biological pretreatment (MBP) along with the residual waste to anaerobic digestion (AD) with the biowaste. This has positive effects on European and Polish goals, ambitions, and targets, such as (i) increasing the level of renewables in the primary energy supply, (ii) decreasing the level of greenhouse gas (GHG) emissions, (iii) increasing the level of preparation for reuse and recycling of municipal waste. The environmental effects of 1 ton additionally separately collected and treated kitchen waste are determined by using life cycle assessment. It was shown that in all selected impact categories (global warming potential, marine eutrophication potential, acidification potential, and ozone depletion potential) a clear environmental benefit can be achieved. These benefits are mainly caused by the avoided emissions of electricity and heat from the Polish production mix, which are substituted by energy generation from biogas combustion. Optimization of the waste management system by diversion of kitchen waste from mechanical-biological pretreatment to anaerobic digestion can lead to considerable saving of 448 kg CO2-eq/t of waste diverted. With an estimated optimization potential for the demonstration site of 40 kg/inh·year for the city of Opole, this would lead to 680,000 t CO2-eq savings per year for the whole of Poland. The sensitivity analysis showed that with a choice for cleaner energy sources the results would, albeit lower, show a significant savings potential.

Biological pretreatment applied to industrial organic fraction of municipal solid wastes (OFMSW): Effect on anaerobic digestion

2011 ◽  
Vol 172 (1) ◽  
pp. 321-325 ◽  
Author(s):  
L.A. Fdez.-Güelfo ◽  
C. Álvarez-Gallego ◽  
D. Sales Márquez ◽  
L.I. Romero García
Keyword(s):  
Anaerobic Digestion ◽  
Solid Wastes ◽  
Biological Pretreatment ◽  
Organic Fraction ◽  
Municipal Solid Wastes

scholarly journals Biological And Thermal Pretreatment Of Lignocellulosic Materials For Enhanced Biogas Production

2021 ◽  
Author(s):  
Samer Dahahda
Keyword(s):  
Anaerobic Digestion ◽  
Organic Material ◽  
Fossil Fuels ◽  
Biogas Production ◽  
Renewable Energy Sources ◽  
Current Status ◽  
Lignocellulosic Materials ◽  
Thermal Pretreatment ◽  
Biological Pretreatment ◽  
Biogas Yield

The rapid depletion of natural resources and the environmental concerns associated with the use of fossil fuels as the main source of global energy is leading to an increased interest in alternative and renewable energy sources. Lignocellulosic biomass is the most abundant source of organic materials that can be utilized as an energy source. Anaerobic digestion has been proven to be an effective technology for converting organic material into energy products such as biogas. However, the nature of lignocellulosic materials hinders the ability of microorganisms in an anaerobic digestion process to degrade and convert organic material to biogas. Therefore, a pretreatment step is necessary to improve the degradability of lignocellulosic materials and achieve higher biogas yield. Several pretreatment methods have been studied over the past few years including physical, thermal, chemical and biological pretreatment. This paper reviews biological and thermal pretreatment as two main promising methods used to improve biogas production from lignocelluloses. A greater focus is given on enzymatic pretreatment which is one of the promising yet under-researched biological pretreatment method. The paper addresses challenges in degrading lignocellulosic materials and the current status of research to improve biogas yield from lignocelluloses through biological and thermal pretreatment.

scholarly journals The Effect of Solid-State Anaerobic Disgestion (Ss-Ad) and Liquid Anaerobic Disgestion (L-Ad) Method in Biogas Production of Rice Husk

2019 ◽  
Vol 1 (1) ◽  
pp. 5-17
Author(s):  
Budiyono Budiyono ◽  
Siswo Sumardiono ◽  
Fadillah Fathir Mahmud Fofana ◽  
Ihwan Fauzi ◽  
Agus Hadiyarto
Keyword(s):  
Anaerobic Digestion ◽  
Solid State ◽  
Rice Husk ◽  
Biogas Production ◽  
Agricultural Waste ◽  
Total Solid ◽  
Biological Pretreatment ◽  
Water Displacement ◽  
Daily Production ◽  
Volume Unit

Rice husk is one of the agricultural waste from rice crop residue which has high potential to be processed into biogas. The purpose of this research is to study the effect of solid state anaerobic digestion and liquid anaerobic digestion on biogas production from rice husk waste. The anaerobic digestion laboratory scale used in this experiment is operated in a batch system and at room temperature. This method is added with chemical and biological pretreatment that was NaOH and microbial consortium. Total solid (TS) was varied from 5%, 7%, 9%, 11% which is L-AD and 17%, 19%, 21%, 23% are SS-AD. Biogas results were measured using the water displacement method every two days to determine daily production. The results showed that with the addition of NaOH the total volume of biogas obtained by L-AD method (TS 9%) and SS-AD (TS 23%) were 1254 ml and 1397 ml. Production of biogas per unit of TS for L-AD method is 46,44 ml / grTS and for SS-AD is 20,246 ml / grts, while biogas production per reactor volume unit for L-AD method is 6,26 ml / ml reactor and for SS-AD method is 4.64 ml / ml reactor. The kinetics constant of biogas production with L-AD method obtained A, U, and λ respectively were 50,53 ml / grTS, 1.23ml / grTS.day, 11,71 day, while for SS-AD method obtained A, U , and λ respectively 21.07 ml / grTS, 0.6 ml / grTS.day, 6.2 days.

scholarly journals Synergistic Co-Digestion of Microalgae and Primary Sludge to Enhance Methane Yield from Temperature-Phased Anaerobic Digestion

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4547
Author(s):  
Mekdimu Mezemir Damtie ◽  
Jingyeong Shin ◽  
Hyun Min Jang ◽  
Young Mo Kim
Keyword(s):  
Anaerobic Digestion ◽  
Synergistic Effects ◽  
Operating Conditions ◽  
Methane Yield ◽  
Biological Pretreatment ◽  
Primary Sludge ◽  
Thermophilic Conditions ◽  
Methane Potential ◽  
Pretreatment Conditions ◽  
Anaerobic Pretreatment

A two-stage temperature-phased mesophilic anaerobic digestion assay was carried out to study the interaction between various biological pretreatment conditions and the possible synergistic co-digestion of microalgae and primary sludge. The study of growth kinetics of the biochemical methane potential test revealed that a maximum of 36% increase in methane yield was observed from co-digestion of a substrate pretreated by thermophilic aerobic conditions (55 °C and HRT = 2 days) and an 8.3% increase was obtained from the anaerobic pretreated substrate (55 °C and HRT = 3 days). Moreover, no synergistic effects on methane yields were observed in co-digesting the substrate pretreated with high temperature (85 °C). The study also identified specific conditions in which interaction between biological pretreatment and co-digestion might substantially reduce methane yield. Careful optimization of operating conditions, both aerobic and anaerobic pretreatment at moderate thermophilic conditions, can be used as a biological pretreatment to enhance methane yield from the co-digestion of microalgae and primary sludge.

scholarly journals Biological And Thermal Pretreatment Of Lignocellulosic Materials For Enhanced Biogas Production

2021 ◽  
Author(s):  
Samer Dahahda
Keyword(s):  
Anaerobic Digestion ◽  
Organic Material ◽  
Fossil Fuels ◽  
Biogas Production ◽  
Renewable Energy Sources ◽  
Current Status ◽  
Lignocellulosic Materials ◽  
Thermal Pretreatment ◽  
Biological Pretreatment ◽  
Biogas Yield

The rapid depletion of natural resources and the environmental concerns associated with the use of fossil fuels as the main source of global energy is leading to an increased interest in alternative and renewable energy sources. Lignocellulosic biomass is the most abundant source of organic materials that can be utilized as an energy source. Anaerobic digestion has been proven to be an effective technology for converting organic material into energy products such as biogas. However, the nature of lignocellulosic materials hinders the ability of microorganisms in an anaerobic digestion process to degrade and convert organic material to biogas. Therefore, a pretreatment step is necessary to improve the degradability of lignocellulosic materials and achieve higher biogas yield. Several pretreatment methods have been studied over the past few years including physical, thermal, chemical and biological pretreatment. This paper reviews biological and thermal pretreatment as two main promising methods used to improve biogas production from lignocelluloses. A greater focus is given on enzymatic pretreatment which is one of the promising yet under-researched biological pretreatment method. The paper addresses challenges in degrading lignocellulosic materials and the current status of research to improve biogas yield from lignocelluloses through biological and thermal pretreatment.

scholarly journals Effects of Pretreatment and Ratio of Solid Sago Waste to Rumen on Biogas Production through Solid-State Anaerobic Digestion

2021 ◽  
Vol 13 (13) ◽  
pp. 7491
Author(s):  
Siswo Sumardiono ◽  
Gebyar Adisukmo ◽  
Muthia Hanif ◽  
Budiyono Budiyono ◽  
Heri Cahyono
Keyword(s):  
Anaerobic Digestion ◽  
Production Rate ◽  
Microbial Consortium ◽  
Biogas Production ◽  
Biological Pretreatment ◽  
Metabolic Balance ◽  
Digestion Process ◽  
Potential Source ◽  
Sago Waste ◽  
Biogas Production Rate

Solid sago waste is a potential source of producing renewable energy in the form of biogas. This study investigated the effects of solid sago waste particle size, biological pretreatment using a microbial consortium of lignocelluloses, pretreatment with NaOH, and the ratio between solid sago waste and cow rumen based on the biogas production rate. Several variations of these conditions were used to achieve this. The anaerobic digestion process was conducted over two months at 30.42 °C ± 0.05 °C, and the biogas production rate was measured every two days. The 1:1 ratio showed better results compared to the 2:1, because it allows the bacteria to achieve metabolic balance. The highest cumulative biogas production (27.91 mL/g TS) was generated when the sago waste underwent milling (±1 mm), pretreatment with 4% NaOH g/g TS, and treatment with microbial consortium 5% v/v at a 1:1 ratio of solid sago waste to the rumen.

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