scholarly journals Evaluation of Microaeration and Sound to Increase Biogas Production from Poultry Litter

Environments ◽  
2020 ◽  
Vol 7 (8) ◽  
pp. 62
Author(s):  
John Loughrin ◽  
Stacy Antle ◽  
Michael Bryant ◽  
Zachary Berry ◽  
Nanh Lovanh
Keyword(s):  
Feeding Rate ◽  
Fine Particles ◽  
Biogas Production ◽  
Poultry Litter ◽  
Sine Wave ◽  
Aerobic Bacteria ◽  
Anaerobic Digesters ◽  
Wastewater Quality ◽  
Complex Polymers ◽  
Sound Treatment

Microaeration, wherein small amounts of air are introduced into otherwise anaerobic digesters, has been shown to enhance biogas production. This occurs by fostering the growth of facultatively aerobic bacteria and production of enzymes that enhance the degradation of complex polymers such as cellulose. The treatment of anaerobic digestate with sound at sonic frequencies (<20 kHz) has also been shown to improve biogas production. Microaeration at a rate of 800 mL day−1, treatment with a 1000-Hz sine wave, and combined microaeration/sound were compared to a control digester for the production of biogas and their effect on wastewater quality. Poultry litter from a facility using wood chips as bedding was used as feed. The initial feeding rate was 400 g week−1, and this was slowly increased to a final rate of 2400 g week−1. Compared to the control, sound treatment, aeration, and combined sound/aeration produced 17%, 32%, and 28% more biogas. The aeration alone treatment may have been more effective than combined aeration/sound due to the sound interfering with retention of aeration or the formation of free radicals during cavitation. Digesters treated with sound had the highest concentrations of suspended solids, likely due to cavitation occurring within the sludge and the resulting suspension of fine particles by bubbles.

scholarly journals In Situ Sonification of Anaerobic Digestion: Extended Evaluation of Performance in a Temperate Climate

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5349
Author(s):  
John Loughrin ◽  
Stacy Antle ◽  
Jason Simmons ◽  
Karamat Sistani ◽  
Nanh Lovanh
Keyword(s):  
Control System ◽  
Anaerobic Digestion ◽  
Biogas Production ◽  
Low Frequency ◽  
Sine Wave ◽  
Temperate Climate ◽  
Anaerobic Digesters ◽  
Environmental Consequences ◽  
The Cost ◽  
Wave Induced

Increasing the efficiency of anaerobic digesters and improving sludge breakdown is vital to reducing the cost of biogas production and reducing the environmental consequences of sludge disposal. The performance of two unheated anaerobic digestion systems, one exposed to sound at <20 kHz by waterproofed speakers and one acting as a control, were compared for over a year. The digester systems were both composed of primary (11.4 m3) and secondary (3.8 m3) anaerobic tanks, facultative tertiary (3.0 m3) tanks and an aerobic holding tank from which effluent was mixed with feed and recirculated back to the system. Exposure of the gas saturated digestate to a low frequency sine wave induced numerous bubble harmonics up to, and presumably beyond, ultrasonic range, showing that sonification of a highly gaseous liquid might be used to accomplish low power ultrasonication of digestate at greater distances than is possible with conventional ultrasonic technology. Through the summer of 2019, the sound-treated system produced 27% more biogas than the control system, and 74 times more during the winter when biogas production by the control systems essentially ceased. Afterwards, the control system produced more biogas due to depletion of volatile solids in the sound-treated digester. Results show that sound can be used for faster digester startup and substitute for a share of heating requirements during cool months.

Programmed Iron Oxide Nanoparticles Disintegration in Anaerobic Digesters Boosts Biogas Production

Small ◽  
2014 ◽  
Vol 10 (14) ◽  
pp. 2801-2808 ◽  
Author(s):  
Eudald Casals ◽  
Raquel Barrena ◽  
Ana García ◽  
Edgar González ◽  
Lucía Delgado ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Biogas Production ◽  
Oxide Nanoparticles ◽  
Anaerobic Digesters

Leaching and anaerobic digestion of poultry litter for biogas production and nutrient transformation

2019 ◽  
Vol 84 ◽  
pp. 413-422 ◽  
Author(s):  
Kristin Chaump ◽  
Matthew Preisser ◽  
Saravanan R. Shanmugam ◽  
Rishi Prasad ◽  
Sushil Adhikari ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Biogas Production ◽  
Poultry Litter

scholarly journals Co-Digestion of Vinasse Waste and Tofu Liquid Waste to Increase Biogas Production

Eksergi ◽  
2015 ◽  
Vol 12 (2) ◽  
pp. 23
Author(s):  
Iqbal Syaichurrozi
Keyword(s):  
Nitrogen Content ◽  
Total Nitrogen ◽  
Biogas Production ◽  
Liquid Waste ◽  
Volume Ratio ◽  
Total Nitrogen Content ◽  
Anaerobic Digesters ◽  
Initial Ph

The purpose of this study was to increase biogas production using co-digestion concept. Vinasse Waste (VW) containing high COD and low total Nitrogen content was mixtured with Tofu Liquid Waste (TLW) containing low COD and high total Nitrogen. Substrates were varied with volume ratio of VW:TLW of 100:0, 20:80, 0:100. Total volume of substrates was 250 mL. Anaerobic digesters were operated at room temperatur. After fermentation, biogas total volume of variables of 100:0, 20:80, 0:100 was 88.5; 125.5; 41.5 mL. Initial pH for all variables was 7.0. At the end of fermentation, pH substrates became 3.9; 5.1; 6.8 for variables of 100:0, 20:80, 0:100 respectively.

scholarly journals Comparison of Household and Communal Biogas Digester Performance to Treat Kitchen Waste, Case Study: Bandung City, Indonesia

2018 ◽  
Vol 73 ◽  
pp. 01019
Author(s):  
Elisabeth Rianawati ◽  
Enri Damanhuri ◽  
Marisa Handajani ◽  
Tri Padmi
Keyword(s):  
Organic Waste ◽  
Open Space ◽  
Biogas Production ◽  
Daily Basis ◽  
Kitchen Waste ◽  
Anaerobic Digesters ◽  
Disposal Area ◽  
Input And Output ◽  
Biogas Productivity

Bandung City is one of the big cities in Indonesia that grappled with waste problem. There is 1,500 ton of waste produced daily, of which 65% is organic. In addition, the water content of the waste could reach 80% during rainy season, given that the waste is commonly collected in open space before transported to the final disposal area. In order to tackle this issue, the municipality of Bandung has started to implement anaerobic digesters to treat kitchen waste since 2013 in an attempt to reduce organic waste. There are three scales of bio-digesters that have been implemented: city 2 ton, communal (20-1000 kg) and household scale (20 kg), which comprise of 1 unit, 15 units and 100 units respectively. This study evaluate the efficiency and biogas productivity of each bio-digesters type. We analyzed 30 unit and 14 unit of household and communal biodigesters respectively. The waste input, slurry output and biogas production were estimated based on average of daily basis. Both the input and output of the biodigesters were characterized (TS, VS, COD) to gain further understanding. This study provide facts and figures to improve the further implementation of household bio-digesters in Bandung City.

Application of the IWA Anaerobic Digestion Model (ADM1) for simulating full-scale anaerobic sewage sludge digestion

2005 ◽  
Vol 52 (1-2) ◽  
pp. 487-492 ◽  
Author(s):  
Y. Shang ◽  
B.R. Johnson ◽  
R. Sieger
Keyword(s):  
Wastewater Treatment ◽  
Steady State ◽  
Anaerobic Digestion ◽  
Biogas Production ◽  
Treatment Plant ◽  
Biochemical Parameter ◽  
Full Scale ◽  
Anaerobic Digesters ◽  
Biogas Yield ◽  
Volatile Solids

A steady-state implementation of the IWA Anaerobic Digestion Model No. 1 (ADM1) has been applied to the anaerobic digesters in two wastewater treatment plants. The two plants have a wastewater treatment capacity of 76,000 and 820,000 m3/day, respectively, with approximately 12 and 205 dry metric tons sludge fed to digesters per day. The main purpose of this study is to compare the ADM1 model results with full-scale anaerobic digestion performance. For both plants, the prediction of the steady-state ADM1 implementation using the suggested physico-chemical and biochemical parameter values was able to reflect the results from the actual digester operations to a reasonable degree of accuracy on all parameters. The predicted total solids (TS) and volatile solids (VS) concentration in the digested biosolids, as well as the digester volatile solids destruction (VSD), biogas production and biogas yield are within 10% of the actual digester data. This study demonstrated that the ADM1 is a powerful tool for predicting the steady-state behaviour of anaerobic digesters treating sewage sludges. In addition, it showed that the use of a whole wastewater treatment plant simulator for fractionating the digester influent into the ADM1 input parameters was successful.

scholarly journals Improved Design of Anaerobic Digesters for Household Biogas Production in Indonesia: One Cow, One Digester, and One Hour of Cooking per Day

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Joseph G. Usack ◽  
Wiratni Wiratni ◽  
Largus T. Angenent
Keyword(s):  
Biogas Production ◽  
Low Cost ◽  
Plug Flow ◽  
Full Scale ◽  
Original Design ◽  
Major Drawback ◽  
Anaerobic Digesters ◽  
Internal Mixing ◽  
Removal Efficiencies ◽  
Improved Design

A government-sponsored initiative in Indonesia to design and implement low-cost anaerobic digestion systems resulted in 21 full-scale systems with the aim to satisfy the cooking fuel demands of rural households owning at least one cow. The full-scale design consisted of a 0.3 m diameter PVC pipe, which was operated as a conventional plug-flow system. The system generated enough methane to power a cooking stove for∼1 h. However, eventual clogging from solids accumulation inside the bioreactor proved to be a major drawback. Here, we improved the digester configuration to remedy clogging while maintaining system performance. Controlled experiments were performed using four 9-L laboratory-scale digesters operated at a temperature of27±1°C, a volatile solids loading rate of 2.0 g VS·L−1·day−1, and a 21-day hydraulic retention time. Two of the digesters were replicates of the original design (control digesters), while the other two digesters included internal mixing or effluent recycle (experimental digesters). The performance of each digester was compared based on methane yields, VS removal efficiencies, and steady-state solids concentrations during an operating period of 311 days. Statistical analyses revealed that internal mixing and effluent recycling resulted in reduced solids accumulation compared to the controls without diminishing methane yields or solids removal efficiencies.

Biogas production with co-digestion of sugarcane straw

2017 ◽  
Vol 28 (1) ◽  
pp. 94-106 ◽  
Author(s):  
Eduardo De Rossi ◽  
Cleber Antonio Lindino ◽  
Paulo André Cremonez ◽  
Kenia Gabriela Dos Santos ◽  
Reinaldo Aparecido Bariccatti ◽  
...  
Keyword(s):  
Citric Acid ◽  
Design Methodology ◽  
Biogas Production ◽  
Poultry Litter ◽  
Chemical Degradation ◽  
Swine Wastewater ◽  
Urea Solution ◽  
Content Type ◽  
Spectrophotometric Methods ◽  
Sugarcane Straw

Purpose The purpose of this paper is to investigate straw modification by chemical degradation generated by two forms of pretreatment, using citric acid in an autoclave and urea solution with sodium hydroxide at low temperature. Design/methodology/approach The material was digested and compared in biodigester reactors lined with natural straw, straw pretreated with citric acid, straw pretreated with urea and NaOH, and straw subjected to both the pretreatments. The amount of straw has been delimited to 0, 2.5, 5, 7.5 and 10 percent v/v, and used 20 percent v/v inoculum in all reactors, consisting of 30 percent v/v poultry litter and 70 percent swine wastewater (SW). The experiment was conducted in an incubator kept in mesophilic conditions (35°C). Findings The results indicate significant change in the studied material, with degradation of lignin as well as hemicellulose and cellulose exposed to further hydrolysis. Spectrophotometric methods were used for monitoring degradation. These methods were efficient in monitoring changes caused by the treatments. When the proposed pretreatments are applied to sugarcane straw, there is a significant gain in biogas production (L g VSR−1). The most appropriate rates for higher methane production in the pretreatments are 2.5 and 5 percent straw-SW. The best results for the anaerobic digestion of sugarcane straw were obtained by pretreating it with citric acid. Originality/value This paper shows a new use for the sugarcane straw waste after being pretreated with acid or base for the coproduction of biogas.

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