scholarly journals High solid anaerobic digestion of municipal solid waste

2007 ◽  
pp. 291-296
Author(s):  
Sunil Kumar ◽  
Somnath Mukherjee ◽  
Sukumar Devotta
Keyword(s):  
Anaerobic Digestion ◽  
Organic Waste ◽  
Biogas Production ◽  
Solid Concentration ◽  
Pollution Load ◽  
High Solid ◽  
Digestion Process ◽  
Waste Stabilization ◽  
Pre Treatment ◽  
Waste Conversion

Anaerobic digestion (AD) is viewed as an attractive method for waste stabilization prior tolandfills as pre-treatment to reduce significant pollution load to the environment Optimizinganaerobic digestion process aims to maximize organic waste conversion to biogas at shortdigestion period, The optimization of high solid concentration of MSW in a laboratory scalereactor was carried out to know the maximum biogas production yield,This paper presents the findings of the study on high solid AD process in single whichinvolves enhanced pre-stage (hydrolysis and acidification) and methane phase,

scholarly journals Process optimization of dry batch anaerobic digestion of municipal solid waste

2007 ◽  
pp. 357-366
Author(s):  
Jeanger P. Juanga
Keyword(s):  
Particle Size ◽  
Anaerobic Digestion ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Biogas Production ◽  
Process Efficiency ◽  
Particle Size Reduction ◽  
Digestion Process ◽  
Waste Stabilization ◽  
Substrate Particle

Optimizing anaerobic digestion aims to maximize organic waste stabilization at shortdigestion period with higher biogas production. This paper presents different strategies tooptimize the anaerobic digestion of organic fraction of municipal solid waste in combinedprocess in which early flushing and microaeration were conducted during pre-stage, Also, theinfluence of substrate particle size reduction and the advantage of thermophilic system overmesophilic in the overall digestion process are presented, Additionally, an attempt was takento employ sequential staging concept by using a mature (old) reactor which underwent acombined digestion process. Importantly, process evaluation between an optimized combinedprocess and sequential staging concept were evaluated with the main objective of optimizingthe process, Process efficiency evaluation was based on biochemical methane potential(BMP) test The overall result suggest that the combined anaerobic digestion process can beoptimized by conducting shorter duration of pre-stage at reduced volume of flushing waterwith microearation, under thennophilic condition at reduced substrate particle size of 30 mm,Nevertheless, the sequential staging concept offers an improved operation over the combinedanaerobic digestion wherein the higher specific methane yield of 11.9 L CH4/kg VS.day wasachieved, Improved waste stabilization with 86% and 79% mass and volume reduction whichcorresponds to 84% process efficiency was obtained by sequential staging process,

scholarly journals Efecto de la aplicación de pre-tratamientos físicos y químicos en la digestión anaerobia de pulpa de café

2019 ◽  
pp. 14-22
Author(s):  
Noemi Nava-Valente ◽  
Luis Antonio López-Escobar ◽  
Oscar Andrés Del Ángel-Coronel ◽  
Jesús Atenodoro-Alonso
Keyword(s):  
Anaerobic Digestion ◽  
Retention Time ◽  
Biogas Production ◽  
Hydrolysis Rate ◽  
Coffee Pulp ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Three Stages ◽  
Pre Treatment

The present study aims to evaluate the effect of thermal pre-treatment (50, 70 Y 90 °C during 1 h) and acid pre-treatment (2.5%, 5% y 10% v/v during 1 h) in anaerobic digestion process of coffee pulp. The methodology consisted of three stages where the waste was obtained and characterized, applied pre-treatments to evaluate the solubilization degree and biogas production. The residue presented a %VS of 91.80, pH of 5.04, total COD 24.26 g/L and soluble COD 14.88 g/L. The solubilization values obtained by applying thermal pre-treatment increased to 0.92-4.98%, while applying acids pre-treatments of 2.6-18.86%. Subsequently, in the anaerobic digestion process, retention time decreased from 23 up to 14 days. The results obtained in this study demonstrate that, pretreatment is significant to increase the percentage of hydrolysis rate, however, the hydrolysis rate percentage cannot be directly related to biogas production in anaerobic digestion.

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

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

Digestion of sludge and organic waste in the sustainability concept for Malmö, Sweden

2004 ◽  
Vol 49 (10) ◽  
pp. 163-169 ◽  
Author(s):  
J. la Cour Jansen ◽  
C. Gruvberger ◽  
N. Hanner ◽  
H. Aspegren ◽  
 Svärd
Keyword(s):  
Anaerobic Digestion ◽  
Organic Waste ◽  
Biogas Production ◽  
Treatment Plant ◽  
Pilot Scale ◽  
Anaerobic Treatment ◽  
Household Waste ◽  
Biogas Yield ◽  
Different Types ◽  
Pre Treatment

Anaerobic digestion of sludge has been part of the treatment plant in Malmö for many years and several projects on optimisation of the digestion process have been undertaken in full scale as well as in pilot scale. In order to facilitate a more sustainable solution in the future for waste management, solid waste organic waste is sorted out from households for anaerobic treatment in a newly built city district. The system for treatment of the waste is integrated in a centralised solution located at the existing wastewater treatment plant. A new extension of the digester capacity enables separate as well as co-digestion of sludge together with urban organic waste from households, industry, restaurants, big kitchens, food stores, supermarkets, green markets etc. for biogas production and production of fertiliser. Collection and pre-treatment of different types of waste are in progress together with examination of biogas potential for different types of organic waste. Collection of household waste as well as anaerobic digestion in laboratory and pilot scale has been performed during the last year. It is demonstrated that organic household waste can be digested separately or in combination with sludge. In the latter case a higher biogas yield is found than should be expected from digestion of the two materials separately. Household waste from a system based on collection of organic waste from grinders could be digested at mesophilic conditions whereas digestion failed at thermophilic conditions.

scholarly journals Sugarcane Bagasse as a Co-Substrate with Oil-Refinery Biological Sludge for Biogas Production Using Batch Mesophilic Anaerobic Co-Digestion Technology: Effect of Carbon/Nitrogen Ratio

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 590
Author(s):  
Aiban Abdulhakim Saeed Ghaleb ◽  
Shamsul Rahman Mohamed Kutty ◽  
Gasim Hayder Ahmed Salih ◽  
Ahmad Hussaini Jagaba ◽  
Azmatullah Noor ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Sugarcane Bagasse ◽  
Organic Waste ◽  
Wastewater Treatment Plants ◽  
Biogas Production ◽  
Raw Materials ◽  
Oil Refinery ◽  
Methane Yield ◽  
Oil Refineries ◽  
Biological Sludge

Man-made organic waste leads to the rapid proliferation of pollution around the globe. Effective bio-waste management can help to reduce the adverse effects of organic waste while contributing to the circular economy at the same time. The toxic oily-biological sludge generated from oil refineries’ wastewater treatment plants is a potential source for biogas energy recovery via anaerobic digestion. However, the oily-biological sludge’s carbon/nitrogen (C/N) ratio is lower than the ideal 20–30 ratio required by anaerobic digestion technology for biogas production. Sugarcane bagasse can be digested as a high C/N co-substrate while the oily-biological sludge acts as a substrate and inoculum to improve biogas production. In this study, the best C/N with co-substrate volatile solids (VS)/inoculum VS ratios for the co-digestion process of mixtures were determined empirically through batch experiments at temperatures of 35–37 °C, pH (6–8) and 60 rpm mixing. The raw materials were pre-treated mechanically and thermo-chemically to further enhance the digestibility. The best condition for the sugarcane bagasse delignification process was 1% (w/v) sodium hydroxide, 1:10 solid-liquid ratio, at 100 °C, and 150 rpm for 1 h. The results from a 33-day batch anaerobic digestion experiment indicate that the production of biogas and methane yield were concurrent with the increasing C/N and co-substrate VS/inoculum VS ratios. The total biogas yields from C/N 20.0 with co-substrate VS/inoculum VS 0.06 and C/N 30.0 with co-substrate VS/inoculum VS 0.18 ratios were 2777.0 and 9268.0 mL, respectively, including a methane yield of 980.0 and 3009.3 mL, respectively. The biogas and methane yield from C/N 30.0 were higher than the biogas and methane yields from C/N 20.0 by 70.04 and 67.44%, respectively. The highest biogas and methane yields corresponded with the highest C/N with co-substrate VS/inoculum VS ratios (30.0 and 0.18), being 200.6 mL/g VSremoved and 65.1 mL CH4/g VSremoved, respectively.

scholarly journals Biogas potential of organic waste onboard cruise ships — a yet untapped energy source

2021 ◽  
Author(s):  
Kai Schumüller ◽  
Dirk Weichgrebe ◽  
Stephan Köster
Keyword(s):  
Energy Source ◽  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Food Waste ◽  
Energy Demand ◽  
Organic Waste ◽  
Biogas Production ◽  
Biogas Yield ◽  
Cruise Ships ◽  
Detailed Presentation

AbstractTo tap the organic waste generated onboard cruise ships is a very promising approach to reduce their adverse impact on the maritime environment. Biogas produced by means of onboard anaerobic digestion offers a complementary energy source for ships’ operation. This report comprises a detailed presentation of the results gained from comprehensive investigations on the gas yield from onboard substrates such as food waste, sewage sludge and screening solids. Each person onboard generates a total average of about 9 kg of organic waste per day. The performed analyses of substrates and anaerobic digestion tests revealed an accumulated methane yield of around 159 L per person per day. The anaerobic co-digestion of sewage sludge and food waste (50:50 VS) emerged as particularly effective and led to an increased biogas yield by 24%, compared to the mono-fermentation. In the best case, onboard biogas production can provide an energetic output of 82 W/P, on average covering 3.3 to 4.1% of the total energy demand of a cruise ship.

Alkali pre-treatment of Sorghum Moench for biogas production

2013 ◽  
Vol 67 (9) ◽  
Author(s):  
Karina Michalska ◽  
Stanisław Ledakowicz
Keyword(s):  
Anaerobic Digestion ◽  
Chemical Oxygen Demand ◽  
Volatile Fatty Acids ◽  
Biogas Production ◽  
Oxygen Demand ◽  
Total Phenolic ◽  
Methane Generation ◽  
Pre Treatment ◽  
Alkali Hydrolysis ◽  
Almost All

AbstractThis work studies the influence of the alkali pre-treatment of Sorghum Moench — a representative of energy crops used in biogas production. Solutions containing various concentrations of sodium hydroxide were used to achieve the highest degradation of lignocellulosic structures. The results obtained after chemical pre-treatment indicate that the use of NaOH leads to the removal of almost all lignin (over 99 % in the case of 5 mass % NaOH) from the biomass, which is a prerequisite for efficient anaerobic digestion. Several parameters, such as chemical oxygen demand, total organic carbon, total phenolic content, volatile fatty acids, and general nitrogen were determined in the hydrolysates thus obtained in order to define the most favourable conditions. The best results were obtained for the Sorghum treated with 5 mass % NaOH at 121°C for 30 min The hydrolysate thus achieved consisted of high total phenolic compounds concentration (ca. 4.7 g L−1) and chemical oxygen demand value (ca. 45 g L−1). Although single alkali hydrolysis causes total degradation of glucose, a combined chemical and enzymatic pre-treatment of Sorghum leads to the release of large amounts of this monosaccharide into the supernatant. This indicates that alkali pre-treatment does not lead to complete cellulose destruction. The high degradation of lignin structure in the first step of the pre-treatment rendered the remainder of the biomass available for enzymatic action. A comparison of the efficiency of biogas production from untreated Sorghum and Sorghum treated with the use of NaOH and enzymes shows that chemical hydrolysis improves the anaerobic digestion effectiveness and the combined pre-treatment could have great potential for methane generation.

Study of thermal hydrolysis as a pretreatment to mesophilic anaerobic digestion of pig slurry

2001 ◽  
Vol 44 (4) ◽  
pp. 109-116 ◽  
Author(s):  
A. Bonmatí ◽  
X. Flotats ◽  
L. Mateu ◽  
E. Campos
Keyword(s):  
Anaerobic Digestion ◽  
Biogas Production ◽  
Limiting Factor ◽  
Pig Slurry ◽  
Thermal Hydrolysis ◽  
Organic Matter Degradation ◽  
Thermal Pretreatment ◽  
Digestion Process ◽  
Degradation Tests ◽  
Thermal Phenomena

Feasibility of anaerobic digestion of pig slurry is dependent, among other factors, on the biogas production rate, which is low compared with other organic wastes, and on the profitable uses of surplus thermal energy produced, a limiting factor in warm geographical areas. The objectives of this work are determining whether low temperature thermal pretreatment (<90°C) improves pig slurry anaerobic digestion, and determining whether organic matter degradation during the thermal pretreatment is due to thermal phenomena (80°C) or to enzymatic ones (60°C). The thermal degradation tests showed that hydrolysis occurring during the thermal pretreatment is due to thermal phenomena. The increase in soluble substances were significantly larger at 80°C than at 60°C (both during 3 h). Two types of slurry were used in the batch anaerobic digestion tests. The effect of thermal pretreatment differed with the type of slurry: it was positive with almost non-degraded slurries containing low NH4+-N concentration, and negative (inhibition of the anaerobic digestion process) when using degraded slurries with high NH4+-N content.

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