Enhancing the Performance of Anaerobic Digestion of Dairy Manure through Phase‐Separation

Yılmaz, Vedat; Demirer, Göksel N.

doi:10.1002/clen.200800024

Cited by 11 publications

(11 citation statements)

References 21 publications

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“…Because of low VFA production, acidification rates were much lower in the OTC‐medicated acidogenic digester. In all acidogenic digesters, main VFA products were acetic acid, propionic acid and butyric acid, in accordance with the findings of Yilmaz and Demirer . As given in Table , both non‐medicated and OTC‐medicated methanogenic digesters achieved higher sCOD removal efficiencies than single‐phase digesters.…”

Section: Resultssupporting

confidence: 88%

“…In all acidogenic digesters, main VFA products were acetic acid, propionic acid and butyric acid, in accordance with the findings of Yilmaz and Demirer. 21 As given in Table 3, both nonmedicated and OTC-medicated methanogenic digesters achieved higher sCOD removal efficiencies than single-phase digesters. Due to the rapid consumption of VFAs both in methanogenic and single-phase digesters, remaining VFA species were measured at very low concentrations which also contributed to much lower acidification rates compared with acidogenic digesters, mostly observed between 1 and 5%.…”

Section: Digestion Stabilitymentioning

confidence: 92%

“…20 Applications of two-phase anaerobic digestion were conducted in manures originating from agricultural activities. 19,21 When dealing with agricultural wastes containing lignocellulosic materials, such as cattle manure, initial hydrolysis of particulate matter is believed to be the rate-limiting step and increasing hydrolysis and acidification rates are very important in order to achieve efficient biomass conversion. 22 There are several studies in the literature suggesting that the addition of exogenous enzymes can improve the performance of anaerobic digestion systems.…”

Section: Introductionmentioning

confidence: 99%

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The fate of oxytetracycline in two‐phase and single‐phase anaerobic cattle manure digesters and its effects on microbial communities

Akyol

İnce

Cetecioglu

et al. 2015

J of Chemical Tech & Biotech

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BACKGROUND The fate of veterinary antibiotics in manure digesters is of great concern because of poor biomethane recovery and potential development of antibiotic resistant bacteria in the environment. RESULTS Manure samples collected from therapeutically treated cattle (a standard veterinary practice of 50 mL OTC solution as 20 mg kg−1 cattle weight) were used in digestion studies. The methane yields of OTC‐medicated two‐phase and single‐phase digesters were 99 ± 8 and 72 ± 9 mL CH4 g−1 VS in the presence of 3.11 ± 0.12 and 3.07 ± 0.14 mg OTC L−1, respectively; whereas, non‐medicated two‐phase and single‐phase digesters had 43% and 52% higher methane yields, respectively. Fluorescence in situ hybridization results indicated that the relative abundance of Firmicutes and Gammaproteobacteria was negatively correlated with the presence of OTC. Methanobacteriales seemed to be a resistant order of methanogenic Archaea to OTC and comparatively higher methane yield in two‐phase non‐medicated cattle manure digester might be the result of the poor cell activity of Methanosarcinales in two‐phase OTC‐medicated cattle manure digester. CONCLUSION Higher OTC removal and biomethane production were achieved by two‐phase configuration, thus, it can be an alternative to treat antibiotic‐medicated manures in full‐scale applications in order to reduce its adverse effects. © 2015 Society of Chemical Industry

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Section: Resultssupporting

confidence: 88%

Section: Digestion Stabilitymentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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The fate of oxytetracycline in two‐phase and single‐phase anaerobic cattle manure digesters and its effects on microbial communities

Akyol

İnce

Cetecioglu

et al. 2015

J of Chemical Tech & Biotech

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“…This might have negatively affected the acidogens since it was stated that their presence increases the adverse effects of OTC on the anaerobic digestion processes. [9] Downloaded by [National Sun Yat-Sen University] at 23: 27 27 December 2014 Overall results are compatible with the study of Yılmaz and Demirer [24] since they found that the acidification rate around 30% and VFA tot concentrations ranged between 1500 and 2000 mg acetic acid/L in acidogenic nonmedicated cattle manure digesters in continuous operation. They also highlighted acetic acid and propionic acid as the main acidification products of dairy manure.…”

Section: Resultssupporting

confidence: 91%

Acidification of non-medicated and oxytetracycline-medicated cattle manures during anaerobic digestion

Akyol

İnce

Türker

et al. 2014

Environmental Technology

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Possible adverse effects of a commonly used veterinary antibiotic, oxytetracycline (OTC), on acidogenic phase of anaerobic digestion of cattle manure along with optimum operating conditions were investigated. A standard veterinary practice of 50 ml OTC solution (20 mg/kg cattle weight) was injected into the muscles of cattle and then manure samples were collected for 5 days following the injection. The 5-day samples were equally mixed and used throughout digestion experiments. Preliminary batch tests were conducted to obtain the optimum pH range and observe volatile fatty acids (VFAs) production. In this regard, different sets of batch digesters were operated at pH ranging from 5.2 +/- 0.1 to 5.8 +/- 0.1 at mesophilic conditions with total solids content of 6.0 +/- 0.2%. The pH of 5.5 +/- 0.1 was found to be the optimum value for acidification for both non-medicated and OTC-medicated conditions. Under predetermined conditions, maximum total VFA (VFAtot) of 830 +/- 3 mg (as acetic acid)/L was produced and maximum acidification rate was evaluated as 11% for OTC-medicated cattle manure, whereas they were 900 +/- 6 mg (as acetic acid)/L and 12% for non-medicated manure. Digestion studies were further continued in a semi-continuous mode at pH 5.5 +/- 0.1 and SRT/HRT of 5 days. VFAtot concentrations and maximum acidification rate increased up to 2181 +/- 19 mg (as acetic acid)/L and 29% for non-medicated cattle manure. For OTC-medicated cattle manure, lower acidification rate of 18% was observed.

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“…The chemical oxygen demand of the dairy manure was also investigated and it was found to be 78,125 mg/l. However, other studies found that the COD of cow manure was 129,400, 38230 and 165,000 mg/l (Stafford et al 1980;Wang et al 2010;Yilmaz 2007). These different values confirmed that the COD depends on the solid content present in the cow manure.…”

Section: Substrate Characteristicsmentioning

confidence: 63%

Optimization of Biogas Production to Use in Cooking Stove

Munbod

Surroop

Reedoye

2013

Climate Change Management

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The objective of this project is to enhance the biogas production from anaerobic digestion of resources, like organic wastes, which are readily available on the island. The project laid emphasis on the optimization of the process which includes methods available up to date to enhance the biogas production. Anaerobic Digestion is the biological treatment of biodegradable organic waste in the absence of oxygen, utilizing microbial activity to break down the waste in a controlled environment. Anaerobic digestion results in the generation of biogas; which is rich in methane, were used to generate heat in a cooking stove. The digestate which is nutrient rich can potentially be used as a soil conditioner or as fertilizer. The digestion process took place in a sealed airtight container (the digester) which was the ideal conditions for the bacteria to ferment the organic material in oxygen-free conditions. A pilot anaerobic digester of 1 m3 was designed proposed whereby cow dung was used as feed to operate the digester. The digester consisted of a mixing unit integrated inside. The digester was then connected to a holder whereby it was used as a biogas storage system. From there on, the biogas was sent to a stove for cooking purposes. Plastics tank were selected as the main material for the design since it was easily available on the market and had low investment cost. This kind of project would be implemented at farmers or lower middle class people who reared cows, since the feed is readily available. This project was feasible for typical Mauritian family in terms of technical, social and economical factors.

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Enhancing the Performance of Anaerobic Digestion of Dairy Manure through Phase‐Separation

Cited by 11 publications

References 21 publications

The fate of oxytetracycline in two‐phase and single‐phase anaerobic cattle manure digesters and its effects on microbial communities

The fate of oxytetracycline in two‐phase and single‐phase anaerobic cattle manure digesters and its effects on microbial communities

Acidification of non-medicated and oxytetracycline-medicated cattle manures during anaerobic digestion

Optimization of Biogas Production to Use in Cooking Stove

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