In-situ microaeration of anaerobic digester treating buffalo manure for enhanced biogas yield

The efficiency of biogas production in semi-continuous anaerobic digester is influenced by several factors, among other is loading rate. This research aimed at determining the effect of hydraulic retention time (HRT) on the biogas yield. Experiment was conducted using lab scale self-designed anaerobic digester of 36-L capacity with substrate of a mixture of fresh cow dung and water at a ratio of 1:1. Experiment was run with substrate initial amount of 25 L and five treatment variations of HRT, namely 1.31 gVS/L/d (P1), 2.47 gVS/L/d (P2), 3.82 gVS/L/d (P3), 5.35 gVS/L/d (P4) and 6.67 gVS/L/d (P5). Digester performance including pH, temperature, and biogas yield was measured every day. After stable condition was achieved, biogas composition was analyzed using a gas chromatograph. A 10-day moving average analysis of biogas production was performed to compare biogas yield of each treatment. Results showed that digesters run quite well with average pH of 6.8-7.0 and average daily temperature 28.7-29.1. The best biogas productivity (77.32 L/kg VSremoval) was found in P1 treatment (organic loading rate of 1.31 g/L/d) with biogas yield of 7.23 L/d. With methane content of 57.23% treatment P1 also produce the highest methane yield. Biogas production showed a stable rate after the day of 44. Modified Gompertz kinetic equation is suitable to model daily biogas yield as a function of digestion time.Article History: Received March 24th 2018; Received in revised form June 2nd 2018; Accepted June 16th 2018; Available onlineHow to Cite This Article: Haryanto, A., Triyono, S., and Wicaksono, N.H. (2018) Effect of Loading Rate on Biogas Production from Cow Dung in A Semi Continuous Anaerobic Digester. Int. Journal of Renewable Energy Development, 7(2), 93-100.https://doi.org/10.14710/ijred.7.2.93-100

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Increasing the biogas yield of a floating drum anaerobic digester using poultry droppings with banana (Musa Paradisiacal) peels

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/445/1/012050 ◽

2020 ◽

Vol 445 ◽

pp. 012050

Author(s):

K A Adeniran ◽

A O Adeniran ◽

T J Sanusi ◽

D A Olasehinde

Keyword(s):

Anaerobic Digester ◽

Biogas Yield ◽

Poultry Droppings

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Designing of lab-scale anaerobic digester equipped with maxblend impeller to evaluate effect of mixing on anaerobic digestion

International Journal of Engineering and Management Sciences ◽

10.21791/ijems.2019.1.50. ◽

2019 ◽

Vol 4 (1) ◽

pp. 404-413

Author(s):

Singh Buta ◽

Zoltán Szamosi ◽

Zoltán Siménfalvi

Keyword(s):

Anaerobic Digestion ◽

Anaerobic Digester ◽

Gas Composition ◽

Operational Parameters ◽

Biogas Yield ◽

Anaerobic Digestion Process ◽

Digestion Process ◽

Mixing Intensity ◽

Enhance Efficiency ◽

Gas Volume

Operational parameters can be easily controlled at lab scale experiments for an anaerobic digestion process. Our aim is to design a lab-scale digester equipped with an impeller to investigate how the geometry of impeller and different mixing modes effect the biogas yield of digester. Further, the methods of measuring the gas volume, gas composition, mixing intensity, torque, temperature are discussed in this article. The assembling of 4 liters digester is described which can be operated at various operating parameters which control the anaerobic digestion process. Mixing is very important to enhance efficiency of an anaerobic digester. To attain mixing Maxblend impeller is used in this lab-scale digester due to its better performance for mixing and power consumption. Various design consideration has been described.

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The Utilization of Water Hyacinth for Biogas Production in a Plug Flow Anaerobic Digester

International Journal of Renewable Energy Development ◽

10.14710/ijred.2021.21843 ◽

2020 ◽

Vol 10 (1) ◽

pp. 27-35

Author(s):

Soeprijanto Soeprijanto ◽

I Dewa Ayu Agung Warmadewanthi ◽

Melania Suweni Muntini ◽

Arino Anzip

Keyword(s):

Water Hyacinth ◽

Eichhornia Crassipes ◽

Biogas Production ◽

Plug Flow ◽

Anaerobic Digester ◽

Yield Potential ◽

Lag Phase ◽

Cow Dung ◽

Biogas Yield ◽

Volatile Solids

Water hyacinth (Eichhornia crassipes) causes ecological and economic problems because it grows very fast and quickly consumes nutrients and oxygen in water bodies, affecting both the flora and fauna; besides, it can form blockages in the waterways, hindering fishing and boat use. However, this plant contains bioactive compounds that can be used to produce biofuels. This study investigated the effect of various substrates as feedstock for biogas production. A 125-l plug-flow anaerobic digester was utilized and the hydraulic retention time was 14 days; cow dung was inoculated into water hyacinth at a 2:1 mass ratio over 7 days. The maximum biogas yield, achieved using a mixture of natural water hyacinth and water (NWH-W), was 0.398 l/g volatile solids (VS). The cow dung/water (CD-W), hydrothermally pretreated water hyacinth/digestate, and hydrothermally pretreated water hyacinth/water (TWH-W) mixtures reached biogas yields of 0.239, 0.2198, and 0.115 l/g VS, respectively. The NWH-W composition was 70.57% CH4, 12.26% CO2, 1.32% H2S, and 0.65% NH3. The modified Gompertz kinetic model provided data satisfactorily compatible with the experimental one to determine the biogas production from various substrates. TWH-W and NWH-W achieved, respectively, the shortest and (6.561 days) and the longest (7.281 days) lag phase, the lowest (0.133 (l/g VS)/day) and the highest (0.446 (l/g VS)/day) biogas production rate, and the maximum and (15.719 l/g VS) and minimum (4.454 l/g VS) biogas yield potential.

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Potential pitfalls of FISH microscopy as assessment method for anaerobic digesters

10.1101/054999 ◽

2016 ◽

Cited By ~ 1

Author(s):

Christian Abendroth ◽

Sarah Hahnke ◽

Michael Klocke ◽

Olaf Luschnig

Keyword(s):

Microbial Activity ◽

Biogas Production ◽

Assessment Method ◽

Gas Production ◽

Anaerobic Digester ◽

Fish Analysis ◽

Metabolic State ◽

Anaerobic Digesters ◽

Biogas Reactor

AbstractIn the present work we investigated how the state of a biogas reactor impacts the enumeration of prokaryotic cells by fluorescencein situhybridisation (FISH). Therefore, the correlation between gas production and FISH hybridisation rates was analysed in different anaerobic digester sludges. High gasification activity coincided with high hybridisation rates. Low hybridisation rates were especially achieved with reactor samples subjected to long starvation periods showing low biogas production.Based on our findings we conclude that samples for FISH analysis should be fixed as soon as possible to prevent a loss of microbial activity resulting in lower FISH signals. Furthermore, the location of sampling is of importance, since samples from different fermenters within the same biogas plant also varied strongly in their FISH hybridisation rate. Our results indicate that FISH could be a useful method for assessing the metabolic state of microorganisms in anaerobic digester plants.

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Overall estimation of mesophilic high-rate anaerobic sludge digestion in internal circulation anaerobic digester integrated with sewage source heat pump

Water Practice & Technology ◽

10.2166/wpt.2012.014 ◽

2012 ◽

Vol 7 (1) ◽

Author(s):

Y. Jiang ◽

J. Wu ◽

L. Tian ◽

L. Shi ◽

Z. P. Cao

Keyword(s):

Heat Pump ◽

Low Cost ◽

Treatment Plant ◽

Anaerobic Digester ◽

High Rate ◽

Anaerobic Sludge ◽

Internal Circulation ◽

Biogas Yield ◽

Coal Boiler ◽

Sewage Source

Sewage source heat pump was integrated with internal circulation anaerobic digester (ICAD) to decrease the treatment cost of waste activated sludge. In the experiment, mesophilic digestion in ICAD was combined with thermal treatment at 60 °C with hydraulic retention time (HRT) of 1 day as pretreatment. The heat pump supplied heat recovering from the effluent of the wastewater treatment plant. The energy consumed by the heat pump was 39.2 and 48.6% less than the gas boiler and coal boiler respectively at a given amount of supplied heat. When the HRT of digestion was 10 days, the average total VSS removal and biogas yield rates of the system were 58.8% and 1.33 m3 · kgVSS−1 respectively. The integration of ICAD and sewage source heat pump offers a low-cost sludge treatment process with satisfactory organic removal.

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Developing A Family-Size Biogas-Fueled Electricity Generating System

International Journal of Renewable Energy Development ◽

10.14710/ijred.6.2.111-118 ◽

2017 ◽

Vol 6 (2) ◽

pp. 111 ◽

Cited By ~ 6

Author(s):

Agus Haryanto ◽

Fadli Marotin ◽

Sugeng Triyono ◽

Udin Hasanudin

Keyword(s):

Renewable Energy ◽

Hydrogen Sulfide ◽

Family Size ◽

Thermal Efficiency ◽

Pilot Scale ◽

Anaerobic Digester ◽

Methane Content ◽

Gas Chromatograph ◽

Biogas Yield ◽

Generating System

The purpose of this study is to develop a family-size biogas-fueled electricity generating system consisting of anaerobic digester, bio-filter scrubber, and power generating engine. Biogas was produced from a pilot scale wet anaerobic digester (5-m3 capacity). The biogas was filtered using bio-scrubber column filled with locally made compost to reduce hydrogen sulfide (H2S) content. Biogas composition was analysed using a gas chromatograph and its H2S level was measured using a H2S detector. A 750-W four stroke power generating engine was used with 100% biogas. Biogas consumed by the generator engine was measured at different load from 100 to 700 W (13.3 to 93.3% of the rated power). Three replications for each load experiment were taken. Results showed that the total biogas yield was 1.91 m3/day with methane content of 56.48% by volume. Bio-filter successfully reduced H2S content in the biogas by 98% (from 400 ppm to 9 ppm). Generator engine showed good performance during the test with average biogas consumption of 415.3 L/h. Specific biogas consumption decreased from 5.05 L/Wh to 1.15 L/Wh at loads of 100 W to 700 W, respectively. Thermal efficiency increased with loads from 6.4% at 100 W to 28.1 at 700 W. The highest thermal efficiency of 30% was achieved at a load of 600 W (80% of the rated power) with specific biogas consumption of 1.07 L/Wh. Keywords: biogas; family size; generator; electricity; bio-filter. Article History: Received Janury 16th 2017; Received in revised form 2nd June 2017; Accepted 18th June 2017; Available onlineHow to Cite This Article: Haryanto, A., Marotin, F., Triyono, S., Hasanudin, U. (2017), Developing A Family-Size Biogas-Fueled Electricity Generating System. International Journal of Renewable Energy Develeopment, 6(2), 111-118.https://doi.org/10.14710/ijred.6.2.111-118

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In-situ sludge pretreatment in a single-stage anaerobic digester

Bioresource Technology ◽

10.1016/j.biortech.2017.04.020 ◽

2017 ◽

Vol 238 ◽

pp. 102-108 ◽

Cited By ~ 12

Author(s):

Yun Chen ◽

Keke Xiao ◽

Xie Jiang ◽

Nan Shen ◽

Raymond J. Zeng ◽

...

Keyword(s):

Anaerobic Digester ◽

Single Stage ◽

Sludge Pretreatment

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Chemical Oxygen Demand Analysis of Anaerobic Digester Contents

STEM Fellowship Journal ◽

10.17975/sfj-2015-008 ◽

2015 ◽

Vol 1 (2) ◽

pp. 2-5 ◽

Cited By ~ 3

Author(s):

Colin M. W. Harnadek ◽

Nigel G.H. Guilford ◽

Elizabeth A. Edwards

Keyword(s):

Chemical Oxygen Demand ◽

Mass Balance ◽

Organic Materials ◽

Oxygen Demand ◽

Anaerobic Digester ◽

Accurate Mass ◽

Maximum Efficiency ◽

Specific Procedure ◽

Biogas Yield ◽

Continuous Mixing

An anaerobic digester converts organic materials into biogas and digestate in the absence of oxygen. The organic materials studied in this experiment include fibres (types of paper or cardboard), food waste, and woodchips, which serve as a bulking agent. To analyze digester performance, it is necessary to calculate an accurate mass balance based on the chemical oxygen demand (COD) entering and exiting the system. Digester performance refers to maximum efficiency and biogas yield. The COD of the biogas is known, but that of the feed and the digestate is not. This paper describes a method for measuring the COD of the feed materials and the digestate by creating representative aqueous suspensions of each. The challenges are to ensure that the suspensions are representative of the feed or digestate, and that samples of the suspension extracted for COD analysis are consistent and reproducible. To obtain an accurate COD measurement of the feed and digestate samples, a specific procedure was developed: each material was processed in a blender with deionized water, creating a pulp from which samples were pipetted during continuous mixing of the suspension. The conducted trials provided COD content values ranging from 1.27-1.59 g of COD/ g of dry feed, depending on the fibre. Standard deviations of the COD content ranged from 2.8% to 12.7%, indicating that the procedure is reliable and the results precise. The measured COD content values allow an accurate mass balance of the digester to be determined, ultimately providing a better understanding of the system as the total digestible material entering the digester will be known. An accurate mass balance can improve the efficiency of the digester in order to produce optimal quantities of biogas. The biogas can be harnessed into energy from otherwise useless waste. Further study in this topic can explore the COD content of wider ranges of organic solids as well as further optimize the procedure in order to provide even more accurate results.

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