Comparative evaluation of batch and continuous process biogas production from animal wastes

Sản xuất phân hữu cơ từ chất thải biogas để tạo ra nguồn phân bón và giải quyết ô nhiễm môi trường là vấn đề quan trọng hiện nay. Do đó, nghiên cứu được thực hiện với mục đích đánh giá ảnh hưởng của việc phối trộn một số vật liệu ủ đến chất lượng của phân hữu cơ từ chất thải biogas và từ đó xác định được vật liệu phối trộn cho chất lượng phân hữu cơ từ chất thải biogas tốt nhất. Thí nghiệm được tiến hành tại phường Hương Vân, thị xã Hương Trà, tỉnh Thừa Thiên Huế trong thời gian từ tháng 11/2019 đến tháng 3/2020 trên 6 công thức với các vật liệu và tỷ lệ ủ khác nhau. Thí nghiệm gồm có 03 lần nhắc lại, bố trí theo kiểu RCBD. Kết quả nghiên cứu cho thấy vật liệu và tỷ lệ ủ khác nhau có ảnh hưởng đến tính chất lý, hóa học của phân hữu cơ từ chất thải biogas theo thời gian ủ. Trong các vật liệu ủ thì kết hợp rơm rạ, vỏ lạc với dung dịch và chất cặn hầm ủ biogas (1:1) + chế phẩm Trichoderma và rơm rạ, vỏ lạc, than bùn với dung dịch và chất cặn hầm ủ biogas (1:1:2) + chế phẩm Trichoderma cho chất lượng của phân hữu cơ là tốt nhất (N 2,72 - 2,92%; P2O5 0,92%; K2O 2,84 - 4,64%, OM 33,50 - 38,84%). Hiệu quả kinh tế trong sản xuất phân hữu cơ từ chất thải biogas thu được cũng cao nhất ở các công thức này. Cần mở rộng kết quả nghiên cứu trên quy mô lớn hơn và thử nghiệm hiệu quả của nó với cây trồng góp phần tăng năng suất, cải tạo đất và giảm thiểu ô nhiễm môi trường từ nguồn chất thải chăn nuôi này. ABSTRACT Producing organic fertilizer from animal wastes after biogas treatment to create fertilizer source and solve environmental pollution is now an important issue. Therefore, the study was conducted with the purpose of assessing the effect of mixing some composting materials on the quality of organic fertilizer from animal waste after biogas production and thereby identifying good mixing materials with the best organic fertilizer from animal waste after biogas production. The experiment consisted of 6 treatments with different composting materials and rates which was conducted in Huong Van ward, Huong Tra town, Thua Thien Hue province from November 2019 to March 2020. The experiment consisted of 3 replicates which was arranged in the Randomize Complete Block Design (RCBD). The research results showed that different composting materials and rates affected on the physical and chemical properties of organic fertilizer from animal waste after biogas production. Among the composting materials, the combinations of liquid and solid wastes from the biogas digesters with rice straw and peanut husks (1:1) + Trichoderma; rice straw, peanut husks and peat (1:1:2) + Trichoderma gave the best quality of organic fertilizers (N 2.72 - 2.92%; P2O5 0.61 - 0.92%; K2O 2.84 - 4.64%, OM 33.50 - 38.84%). The highest economic efficiencies also obtained in these treatments. It is necessary to expand the research results on a larger scale and to test its effectiveness on crops that contribute to productivity, soil improvement and environmental pollution from the animal wastes.

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Home Biogas Production using Homemade Bio-activator with Chicken Manure

Jurnal Presipitasi Media Komunikasi dan Pengembangan Teknik Lingkungan ◽

10.14710/presipitasi.v18i2.271-281 ◽

2021 ◽

Vol 18 (2) ◽

pp. 271-281

Author(s):

Heru Surianto ◽

Slamet Raharjo ◽

Suci Wulandari

Keyword(s):

Waste Water ◽

Food Waste ◽

Previous Experiment ◽

Biogas Production ◽

Continuous Process ◽

Batch Process ◽

Laboratory Scale ◽

Chicken Manure ◽

Cumulative Volume ◽

Ratio Set

The previous experiment was obtained that homemade activator is the best activator to produce biogas by using food waste consist of vegetable, fruit and rice waste. The current research is carried out by adding chicken manure as a co-activator. Chicken manure content rich in nitrogen can be significantly enhance biogas production. This study is expected to increase the biogas production. There are two processes conducted at the laboratory scale, batch and semi-continuous process. The batch process aim to activate bacteria. The ratio set at food waste/chicken manure, 2 : 1 of digester #1, 3 : 1 of digester #2, 4 : 1 of digester #3 and digester control using food waste only. Stage two aims to produce biogas by adding food waste for 6 days periodically. The ratio is set at food waste/water, 1 : 2. The highest biogas yielded is digester 2 with a cumulative volume biogas 120.77 liters consist of 71.01% CH4, 26% CO2, 2.9% O2 and 0.088% H2S. The potential of methane gas produced is 0.87 kWh and methane volume per TS and VS at around 18.72 L/kg and 34.68 L/kg, respectively.

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Comparative evaluation of different pretreatment methods on biogas production from paddy straw

Journal of Applied and Natural Science ◽

10.31018/jans.v9i3.1396 ◽

2017 ◽

Vol 9 (3) ◽

pp. 1525-1533

Author(s):

Vishwas Garg ◽

Rouf Ahmad Dar ◽

Urmila Gupta Phutela

Keyword(s):

Comparative Evaluation ◽

Biogas Production ◽

Silica Content ◽

Paddy Straw ◽

Maximum Increase ◽

Enzymatic Pretreatment ◽

Naoh Pretreatment ◽

Fungal Pretreatment ◽

Pre Treatment ◽

Potential Methods

The present investigations observed the effect of chemical, enzymatic, biological and micro-wave pretreatment on paddy straw for enhancement of biogas production. Chopped and soaked paddy straw was subjected to chemicals Na2CO3 (1%) and NaOH (2%) concentrations, microwave irradiation (720 watt, 30 min), fungal (spawn impregnated, 7 days) and crude silicase (24 hrs) pretreatment. The proximate and chemical analysis showed 16.0% and 12.1% reduction in lignin and silica content in the case of Na2CO3 pretreated paddy straw whereas 23.0% and 46.8% reduction was observed in enzymatic pretreatment with 43.7% and 31.1% enhancement in biogas production respectively. This clearly indi-cates that Pleurotus ostreatus MTCC 142 is silicolytic as well as ligninolytic in nature. Enzymatic pre-treatment was also compared with, microwave (30 min) and fungal pretreatment which showed 31.2% and 32.8% reduction in silica content enhancing biogas production by 19.7% and 42.6% respectively. NaOH pretreatment showed a maximum increase in biogas production i.e. 49.7% as compared to 1% pretreated sample which showed 28.5% enhancement. The results indicated that the NaOH pretreatment was one of the potential methods to increase biogas production of paddy straw.

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Study of Biogas Production from Cassava Industrial Waste by Anaerobic Process

MATEC Web of Conferences ◽

10.1051/matecconf/201815603052 ◽

2018 ◽

Vol 156 ◽

pp. 03052 ◽

Cited By ~ 3

Author(s):

Budiyono ◽

Arindra D. Primaloka ◽

Listi Ardhannari ◽

Hashfi H.A. Matin ◽

Siswo Sumardiono

Keyword(s):

Industrial Waste ◽

Biogas Production ◽

Continuous Process ◽

Methanogenic Bacteria ◽

Cassava Starch ◽

Two Stage ◽

Production Processes ◽

Hydrolysis Process ◽

Starch Wastewater ◽

Production Period

Biogas production processes from tapioca wastewater have several problems that cause the biogas production is not optimal, such as pH drop at beginning of the process because the rate of acid formation is too fast and the rate of starch wastewater degradation is too slow. Therefore, to obtain optimal biogas production it is required two-stage reactor. The purposes of this research were to (i) study the influence of one stage fermentation and two stage fermentation on biogas production, (ii) study the effect of buffer Na2CO3 on biogas production, and (iii) study the effect of methanogenic bacteria concentration on biogas production from cassava starch effluent. The first method of our research was hydrolysis process by “Saccharomyces cereviceae” as substrate activator. The second is the arrangement of pH and the last is process of methane production. The results showed that the highest biogas production is achieved at concentration of methanogenic bacteria 20% (v/v) that is equal to 2458 ml. At concentration of 8% (v/v) and 15% (v/v), biogas production was 2105 ml and 2117 ml. The addition of Na2CO3 can extend to 16 days with accumulation of 372 ml. While without the addition of buffer, biogas production period was only 9 days with accumulation of 620 ml. In semi continuous process, the analysis carried out every 3 days. Highest biogas production achieved in the variable addition of yeast with the accumulation 9329 ml. Without yeast, accumulation of biogas was 6831 ml. Yeast is use as substrate activator so it can accelerate the hydrolysis process and increased biogas production. The addition of Na2CO3 is increase the alkalinity so the pH drop did not occur early in the process.

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Pilot Plant Data Assessment in Anaerobic Digestion of Organic Fraction of Municipal Waste Solids

Processes ◽

10.3390/pr7010054 ◽

2019 ◽

Vol 7 (1) ◽

pp. 54 ◽

Cited By ~ 7

Author(s):

Massimo Migliori ◽

Enrico Catizzone ◽

Girolamo Giordano ◽

Adolfo Le Pera ◽

Miriam Sellaro ◽

...

Keyword(s):

Anaerobic Digestion ◽

Volatile Fatty Acids ◽

Biogas Production ◽

Continuous Process ◽

Solid Content ◽

Municipal Waste ◽

Slight Reduction ◽

Organic Fraction ◽

Municipal Solid Wastes ◽

Dry Process

In this paper, a preliminary study of anaerobic digestion of organic fraction of municipal solid wastes (OFMSW) in presented with the aim to compare the performances of both wet- and dry-type reactors. The treatment of OFMSW via anaerobic digestion (AD) producing biogas is a process that is receiving a growing interest because two different needs can be coupled: the request of sustainable municipal waste treatments and increasing demand renewable energy. This paper aims to offer experimental results comparing batch test and continuous experimental reactors under different conditions of humidity and solid content. Results show that both the investigated configurations may be used for converting OFMSW into a high quality biogas and that the increase of dry matter in the continuous process still allows to achieve significant biogas production rates. A slight reduction of the methane content was observed (less than 5% relative) that can be also related to the change in the level of volatile fatty acids. These results are very promising in supporting the possibility of operating an industrial scale plant with a dry-process without affecting the system performance.

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Effect of Effluent Recirculation on Biogas Production Using Two-stage Anaerobic Digestion of Citrus Waste

Molecules ◽

10.3390/molecules23123380 ◽

2018 ◽

Vol 23 (12) ◽

pp. 3380 ◽

Cited By ~ 8

Author(s):

Lukitawesa ◽

Rachma Wikandari ◽

Ria Millati ◽

Mohammad J. Taherzadeh ◽

Claes Niklasson

Keyword(s):

Anaerobic Digestion ◽

Liquid Phase ◽

Biogas Production ◽

Continuous Process ◽

Methane Yield ◽

Organic Loading Rate ◽

Anaerobic Sludge ◽

Two Stage ◽

Effluent Recirculation ◽

Citrus Waste

Citrus waste is a promising potential feedstock for anaerobic digestion, yet the presence of inhibitors such as d-limonene is known to limit the process. Effluent recirculation has been proven to increase methane yield in a semi-continuous process for recalcitrant material, but it has never been applied to toxic materials. This study was aimed to investigate the effect of recirculation on biogas production from citrus waste as toxic feedstock in two-stage anaerobic digestion. The first digestion was carried out in a stirred tank reactor (STR). The effluent from the first-stage was filtered using a rotary drum filter to separate the solid and the liquid phase. The solid phase, rich in hydrophobic D-limonene, was discarded, and the liquid phase containing less D-limonene was fed into the second digester in an up-flow anaerobic sludge bed (UASB) reactor. A high organic loading rate (OLR 5 g VS/(L·day)) of citrus waste was fed into the first-stage reactor every day. The effluent of the first-stage was then fed into the second-stage reactor. This experiment was run for 120 days. A reactor configuration without recirculation was used as control. The result shows that the reactor with effluent recirculation produced a higher methane yield (160–203 NmL/g·VS) compared to that without recirculation (66–113 NmL/g·VS). More stable performance was also observed in the reactor with recirculation as shown by the pH of 5–6, while without recirculation the pH dropped to the range of 3.7–4.7. The VS reduction for the reactor with recirculation was 33–35% higher than that of the control without recirculation. Recirculation might affect the hydrolysis-acidogenesis process by regulating pH in the first-stage and removing most of the D-limonene content from the substrate through filtration.

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