Anaerobic digestion of straw and corn stover: The effect of biological process optimization and pre-treatment on total bio-methane yield and energy performance

Anaerobic digestion is a biological process with wide application for the treatment of high organic-containing streams. The production of biogas and the lack of oxygen requirements are the main energetic advantages of this process. However, the digested stream may not readily find a final disposal outlet under certain circumstances. The present manuscript analyzed the feasibility of valorizing digestate by the hydrothermal carbonization (HTC) process. A hypothetical plant treating cattle manure and cheese whey as co-substrate (25% v/w, wet weight) was studied. The global performance was evaluated using available data reported in the literature. The best configuration was digestion as a first stage with the subsequent treatment of digestate in an HTC unit. The treatment of manure as sole substrate reported a value of 752 m3/d of biogas which could be increased to 1076 m3/d (43% increase) when coupling an HTC unit for digestate post-treatment and the introduction of the co-substrate. However, the high energy demand of the combined configurations indicated, as the best alternative, the valorization of just a fraction (15%) of digestate to provide the benefits of enhancing biogas production. This configuration presented a much better energy performance than the thermal hydrolysis pre-treatment of manure. The increase in biogas production does not compensate for the high energy demand of the pre-treatment unit. However, several technical factors still need further research to make this alternative a reality, as it is the handling and pumping of high solid slurries that significantly affects the energy demand of the thermal treatment units and the possible toxicity of hydrochar when used in a biological process.

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Novel low-cost pre-treatment material for enhancing the methane yield during anaerobic digestion of lignocellulosic biomass feedstocks: Experimental and kinetic study

Renewable Energy ◽

10.1016/j.renene.2021.07.064 ◽

2021 ◽

Author(s):

Uchenna Egwu ◽

Eni Oko ◽

Macmanus Chinenye Ndukwu ◽

Paul Sallis

Keyword(s):

Anaerobic Digestion ◽

Kinetic Study ◽

Lignocellulosic Biomass ◽

Low Cost ◽

Methane Yield ◽

Biomass Feedstocks ◽

Pre Treatment

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Influence of a steam-explosion pre-treatment on the methane yield and kinetics of anaerobic digestion of two-phase olive mil solid waste or alperujo

Process Safety and Environmental Protection ◽

10.1016/j.psep.2016.04.010 ◽

2016 ◽

Vol 102 ◽

pp. 361-369 ◽

Cited By ~ 18

Author(s):

Bárbara Rincón ◽

Guillermo Rodríguez-Gutiérrez ◽

Lucía Bujalance ◽

Juan Fernández-Bolaños ◽

Rafael Borja

Keyword(s):

Anaerobic Digestion ◽

Solid Waste ◽

Steam Explosion ◽

Methane Yield ◽

Two Phase ◽

Pre Treatment ◽

Kinetics Of

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Significance of Pretreatment in Enhancing the Performance of Dry Anaerobic Digestion of Food Waste: An Insight on Full Scale Implementation Strategy with Theoretical Analogy

Processes ◽

10.3390/pr8091018 ◽

2020 ◽

Vol 8 (9) ◽

pp. 1018

Author(s):

Vijayalakshmi Arelli ◽

Sudharshan Juntupally ◽

Sameena Begum ◽

Gangagni Rao Anupoju

Keyword(s):

Anaerobic Digestion ◽

Food Waste ◽

Scale Up ◽

Methane Yield ◽

Net Energy ◽

Time Duration ◽

Methane Generation ◽

Pre Treatment ◽

The Impact ◽

Dry Anaerobic Digestion

The aim of this study was to treat food waste containing 25% total solids (TS) through dry anaerobic digestion (dry AD) process at various pressures (0.5 to 2.5 kg/cm2) and different time duration (20 to 100 min) to understand the impact of pretreatment in enhancing the methane generation potential along with insights on scale up. The findings revealed that vs. reduction and methane yield of 60% and 0.25 L CH4/(g VSadded) can be achieved with pretreated food waste at two kilograms per square centimeter, while pretreatment of food waste at 2 kg/cm2 for 100 min enhanced the vs. reduction from 60% to 85% and methane yield from 0.25 to 0.368 L CH4/(g VSadded). However, the net energy indicated that 40 min of pre -treatment at two kilograms per square centimeter can be a suitable option as methane yield and vs. reduction of 0.272 L CH4/(g VSadded) and 70%, respectively was achieved. The vs. reduction and the methane yield of 45% and 0.14 L CH4/(g VSadded), respectively was obtained from untreated food waste which illustrated that pretreatment had significantly impacted on the enhancement of methane generation and organic matter removal which can make the dry AD process more attractive and feasible at commercial scale.

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High pressure thermal hydrolysis as pre-treatment to increase the methane yield during anaerobic digestion of microalgae

Bioresource Technology ◽

10.1016/j.biortech.2012.12.125 ◽

2013 ◽

Vol 131 ◽

pp. 128-133 ◽

Cited By ~ 103

Author(s):

Philip Keymer ◽

Ian Ruffell ◽

Steven Pratt ◽

Paul Lant

Keyword(s):

High Pressure ◽

Anaerobic Digestion ◽

Methane Yield ◽

Thermal Hydrolysis ◽

Pre Treatment

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Techno-economic feasibility of anaerobic digestion of cheese whey in small Italian dairies and effect of ultrasound pre-treatment on methane yield

Journal of Environmental Management ◽

10.1016/j.jenvman.2019.06.014 ◽

2019 ◽

Vol 246 ◽

pp. 557-563 ◽

Cited By ~ 14

Author(s):

Matia Mainardis ◽

Simone Flaibani ◽

Matteo Trigatti ◽

Daniele Goi

Keyword(s):

Anaerobic Digestion ◽

Cheese Whey ◽

Economic Feasibility ◽

Methane Yield ◽

Pre Treatment

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Evaluation of methane yield using acidogenic effluent of NaOH pretreated corn stover in anaerobic digestion

Renewable Energy ◽

10.1016/j.renene.2017.07.001 ◽

2018 ◽

Vol 116 ◽

pp. 224-233 ◽

Cited By ~ 21

Author(s):

Chun Mei Liu ◽

Akiber Chufo Wachemo ◽

Hai Rong Yuan ◽

De Xun Zou ◽

Yan Ping Liu ◽

...

Keyword(s):

Anaerobic Digestion ◽

Corn Stover ◽

Methane Yield ◽

Pretreated Corn Stover

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On the Effect of Aqueous Ammonia Soaking Pre-Treatment on Continuous Anaerobic Digestion of Digested Swine Manure Fibers

Molecules ◽

10.3390/molecules24132469 ◽

2019 ◽

Vol 24 (13) ◽

pp. 2469 ◽

Cited By ~ 3

Author(s):

Chrysoula Mirtsou-Xanthopoulou ◽

Ioannis V. Skiadas ◽

Hariklia N. Gavala

Keyword(s):

Renewable Energy ◽

Anaerobic Digestion ◽

Solid Fraction ◽

Aqueous Ammonia ◽

Swine Manure ◽

Methane Yield ◽

Batch Experiments ◽

The Past ◽

Aqueous Ammonia Soaking ◽

Pre Treatment

(1) Background: The continuously increasing demand for renewable energy sources renders anaerobic digestion as one of the most promising technologies for renewable energy production. Due to the animal production intensification, manure is being used as the primary feedstock for most biogas plants. Their economical profitable operation, however, relies on increasing the methane yield from the solid fraction of manure, which is not so easily degradable. The solid fraction after anaerobic digestion, the so-called digested fibers, consists mainly of hardly biodegradable material and comes at a lower mass per unit volume of manure compared to the solid fraction before anaerobic digestion. Therefore, investigation on how to increase the biodegradability of digested fibers is very relevant. So far, Aqueous Ammonia Soaking (AAS), has been successfully applied on digested fibers separated from the effluent of a manure-fed, full-scale anaerobic digester to enhance their methane productivity in batch experiments. (2) Methods: In the present study, continuous experiments at a mesophilic (38 °C) CSTR-type anaerobic digester fed with swine manure first and a mixture of manure with AAS-treated digested fibers in the sequel, were performed. Anaerobic Digestion Model 1 (ADM1) previously fitted on manure fed digester was used in order to assess the effect of the addition of AAS-pre-treated digested manure fibers on the kinetics of anaerobic digestion process. (3) Results and Conclusions: The methane yield of AAS-treated digested fibers under continuous operation was 49–68% higher than that calculated in batch experiments in the past. It was found that AAS treatment had a profound effect mainly on the disintegration/hydrolysis rate of particulate carbohydrates. Comparison of the data obtained in the present study with the data obtained with AAS-pre-treated raw manure fibers in the past revealed that hydrolysis kinetics after AAS pre-treatment were similar for both types of biomasses.

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APLIKASI THERMAL PRE-TREATMENT LIMBAH TANAMAN JAGUNG (Zea mays) SEBAGAI CO·SUBSTRAT PADA PROSES ANAEROBIK DIGESTI UNTUK PRODUKSI BIOGAS

Jurnal Agritech ◽

10.22146/agritech.10687 ◽

2016 ◽

Vol 36 (01) ◽

pp. 79

Author(s):

Darwin Darwin ◽

Yusmanizar Yusmanizar ◽

Muhammad Ilham ◽

Afrizal Fazil ◽

Satria Purwanto ◽

...

Keyword(s):

Anaerobic Digestion ◽

Corn Stover ◽

Biogas Production ◽

Lag Phase ◽

Total Production ◽

Biogas Yield ◽

Anaerobic Digestion Process ◽

Digestion Process ◽

Volatile Solids ◽

Pre Treatment

Thermal pre-treatment was given on corn stover in the purpose of breaking the lignin content; thus, it may help anaerobic microorganisms to convert polymer including cellulose and hemicelluloses into biogas. This study aimed to investigate the effects of thermal pre-treatment on corn stover in anaerobic digestion process related to the production of biogas as well as digestion process efficiency. This research was carried out by utilizing batch reactors where the temperature was maintained at mesophilic conditions above room temperature (33 ± 2 oC). Based on the result, it was known that thermal pre-treatment given on the corn stover may enhance anaerobic digestion process for biogas production at the first 10 days. This condition reduced the time of lag phase during anaerobic digestion. The biogas production of corn stover given thermal pre-treatment was slow at 26 days where their average total production were 12,412.5 mL,12,310 mL at 15 and 25 minutes thermal pre-treatment, respectively while biogas production of non pre-treated corn stover was 12,557 mL. The highest daily biogas production was accomplished by corn stover that was given thermal pre-treatment at 25 minutes (915 mL). Corn stover given with 15 minutes thermal pre-treatment also generated higher daily biogas production at day 9 (772.5 mL) compared with corn stover that was not pre-treated (405 mL). This research also revealed that corn stover given thermal pre-treatment reached higher biogas yield compared with non pre-treated corn stover where their biogas yield were 670.39, 690.65 mL/g volatile solids added at 15 and 25 minutes thermal pre- treatment respectively, and 456.37 mL/g volatile solids added of non pre-treated corn stover.Keywords: Thermal pre-treatment, corn stover, anaerobic digestion, biogas ABSTRAKThermal pre-treatment diberikan pada limbah tanaman jagung dengan tujuan untuk memecahkan kandungan lignin yang terdapat pada limbah tanaman jagung sehingga memudahkan mikroorganisme anaerobik untuk mengkonversi polimer yang berupa selulosa dan hemiselulosa menjadi biogas. Tujuan dari penelitian ini adalah untuk melakukan kajian mengenai penerapan thermal pre-treatment pada limbah tanaman jagung terhadap proses anaerobik digesi yang meliputi efisiensi proses digesi dan produksi biogas yang dihasilkan. Penelitian ini dilakukan dengan menggunakan reaktor tipe batch yang suhunya dipertahankan pada kondisi mesophilic atau di atas rata-rata suhu kamar (33 ± 2 oC). Hasil penelitian diperoleh bahwa thermal pre-treatment yang diberikan pada limbah tanaman jagung mampu mempercepat proses produksi biogas pada 10 hari pertama sehingga dapat mengurangi lag-phase pada proses anaerobik digesi. Limbah tanaman jagung yang diberikan thermal pre-treatment mengalami perlambatan produksi biogas pada hari ke 26 dengan rata-rata total produksi 12.412,5 mL untuk limbah tanaman jagung yang diberikan thermal pre- treatment selama 15 menit, dan 12.310 mL untuk limbah tanaman jagung yang diberikan thermal pre-treatment selama 25 menit, sedangkan limbah tanaman jagung yang tidak diberikan pre-treatment menghasilkan produksi biogas sebesar 12.557 mL pada hari ke 26. Produksi biogas harian tertinggi terjadi pada substrat yang diberikan thermal pre-treatment 25 menit, dengan produksi biogas tertinggi pada hari ke 9 dengan rata-rata produksi sebesar 915 mL. Substrat yang diberikan thermal pre-treatment 15 menit juga memproduksi biogas jauh lebih tinggi (772,5 mL) pada hari ke 9 jika dibandingkan dengan substrat tanpa diberikan pre-treatment yang hanya memproduksi biogas sebesar 405 mL. Data hasil penelitian menunjukkan bahwa limbah tanaman jagung yang diberikan thermal pre-treatment memperoleh biogas yield lebih tinggi dari pada yang tidak diberikan pre-treatment dimana 670,39 mL/g volatile solids untuk thermal pre- treatment 15 menit, 690,65 mL/g volatile solids untuk thermal pre-treatment 25 menit dan 456,37 mL/g volatile solids untuk limbah tanaman jagung yang tidak diberikan pre-treatment.Kata kunci: Thermal pre-treatment, limbah tanaman jagung, anaerobik digesi, biogas

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