Rapid generation of volatile fatty acids (VFA) through anaerobic acidification of livestock organic waste at low hydraulic residence time (HRT)

Kuruti, Kranti; Nakkasunchi, Shalini; Begum, Sameena; Juntupally, Sudharshan; Arelli, Vijayalakshmi; Anupoju, Gangagni Rao

doi:10.1016/j.biortech.2017.04.005

Cited by 49 publications

(18 citation statements)

References 21 publications

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“…With slurry acidification (mean pHs 6.5 and 5.9), shifts in the abundance and activities of bacterial communities, as estimated from 16S rRNA gene and transcript copies, were not significant. Thus, acidification might have little effect on growth and activities of bacterial communities involved in the anaerobic degradation of organic matter (e.g., hydrolytic, acidogenic, and acetogenic bacteria) in manure ( Lin et al, 2013 ; Kuruti et al, 2017 ). As acidification may reduce aggregation of slurry particles ( Fangueiro et al, 2015 ; Gomez-Munoz et al, 2016 ; Regueiro et al, 2016 ), substrate availability for hydrolytic and acidogenic bacteria in slurries may increase.…”

Section: Discussionmentioning

confidence: 99%

Reduction in Methane Emissions From Acidified Dairy Slurry Is Related to Inhibition of Methanosarcina Species

et al. 2018

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Liquid dairy manure treated with sulfuric acid was stored in duplicate pilot-scale storage tanks for 120 days with continuous monitoring of CH4 emissions and concurrent examination of changes in the structure of bacterial and methanogenic communities. Methane emissions were monitored at the site using laser-based Trace Gas Analyzer whereas quantitative real-time polymerase chain reaction and massively parallel sequencing were employed to study bacterial and methanogenic communities using 16S rRNA and methyl-coenzyme M Reductase A (mcrA) genes/transcripts, respectively. When compared with untreated slurries, acidification resulted in 69–84% reductions of cumulative CH4 emissions. The abundance, activity, and proportion of bacterial communities did not vary with manure acidification. However, the abundance and activity of methanogens (as estimated from mcrA gene and transcript copies, respectively) in acidified slurries were reduced by 6 and 20%, respectively. Up to 21% reduction in mcrA transcript/gene ratios were also detected in acidified slurries. Regardless of treatment, Methanocorpusculum predominated archaeal 16S rRNA and mcrA gene and transcript libraries. The proportion of Methanosarcina, which is the most metabolically-diverse methanogen, was the significant discriminant feature between acidified and untreated slurries. In acidified slurries, the relative proportions of Methanosarcina were ≤ 10%, whereas in untreated slurries, it represented up to 24 and 53% of the mcrA gene and transcript libraries, respectively. The low proportions of Methanosarcina in acidified slurries coincided with the reductions in CH4 emissions. The results suggest that reduction of CH4 missions achieved by acidification was due to an inhibition of the growth and activity of Methanosarcina species.

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Section: Discussionmentioning

confidence: 99%

Reduction in Methane Emissions From Acidified Dairy Slurry Is Related to Inhibition of Methanosarcina Species

et al. 2018

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“…Tests were done in 500 ml bottles, with a liquid volume of 400 ml. The substrate/inoculum VS:VS ratio was 0.5 (Ghimire et al, 2015;Kuruti, Nakkasunchi, Begum, Juntupally, & Arelli, 2017) with inoculum volumes from 214 to 300 g per bottle (Table 1). Distilled water was added to achieve the desired liquid volume.…”

Section: Batch Experimentsmentioning

confidence: 99%

“…The VFA content and microbial communities during the experiment were analyzed from the BMP bottles using destructive sampling by terminating three parallel test bottles after 1, 3, 6, and 10 days from each treatment ( Figure 1). A 10-day experiment duration was also proposed by Jankowska et al (2015) and Kuruti et al (2017).…”

Section: Batch Experimentsmentioning

confidence: 99%

Volatile fatty acids (VFAs) and methane from food waste and cow slurry: Comparison of biogas and VFA fermentation processes

et al. 2018

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The potential of various biomasses for the production of green chemicals is currently one of the key topics in the field of the circular economy. Volatile fatty acids (VFAs) are intermediates in the methane formation pathway of anaerobic digestion and they can be produced in similar reactors as biogas to increase the productivity of a digestion plant, as VFAs have more varying end uses compared to biogas and methane. In this study, the aim was to assess the biogas and VFA production of food waste (FW) and cow slurry (CS) using the anaerobic biogas plant inoculum treating the corresponding substrates. The biogas and VFA production of both biomasses were studied in identical batch scale laboratory conditions while the process performance was assessed with chemical and microbial analyses. As a result, FW and CS were shown to have different chemical performances and microbial dynamics in both VFA and biogas processes. FW as a substrate showed higher yields in both processes (435 ml CH4/g VSfed and 434 mg VFA/g VSfed) due to its characteristics (pH, organic composition, microbial communities), and thus, the vast volume of CS makes it also a relevant substrate for VFA and biogas production. In this study, VFA profiles were highly dependent on the substrate and inoculum characteristics, while orders Clostridiales and Lactobacillales were connected with high VFA and butyric acid production with FW as a substrate. In conclusion, anaerobic digestion supports the implementation of the waste management hierarchy as it enables the production of renewable green chemicals from both urban and rural waste materials.

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“…The experiment indicated that adding an effective microorganism to a reactant could enhance the enzymatic activity of AD and increase the gas production quantity [21]. The study found that a method of heat treatment or alkali treatment could improve the AD rate [22][23][24][25]. Research has shown that mixed AD could reduce the adverse effects of heavy metals and toxic materials on the whole system better than single-material AD could [26,27].…”

Section: Of 21mentioning

confidence: 99%

Anaerobic Digestion Technology for Methane Production Using Deer Manure Under Different Experimental Conditions

Wang

Sheng

et al. 2019

Energies

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Anaerobic digestion (AD) is an important technology for the treatment of livestock and poultry manure. The optimal experimental conditions were studied, with deer manure as a fermentation material and mushroom residue as an inoculum. At the same time, methane production was increased by adding zeolite and changing the magnetic field conditions. The results showed that a 6% solid content was the best condition for producing methane. The optimal conditions for methane production were obtained by adding 35 g of mushroom residue to 80 g of deer manure at 35 °C. The addition of organic wastewater (OW) improved methane production. The result of improving the methane production factor showed that adding zeolite during the reaction process could increase the methane production rate. When the amount of zeolite was over 8% total solids (TSes), methane production could improve, but the rate decreased. Setting a different magnetic field strength in the AD environment showed that when the distance between the magnetic field and the reactor was 50 mm and the magnetic field strength was 10–50 mT, the methane production increment and the content of methane in the mixed gases increased.

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Rapid generation of volatile fatty acids (VFA) through anaerobic acidification of livestock organic waste at low hydraulic residence time (HRT)

Cited by 49 publications

References 21 publications

Reduction in Methane Emissions From Acidified Dairy Slurry Is Related to Inhibition of Methanosarcina Species

Reduction in Methane Emissions From Acidified Dairy Slurry Is Related to Inhibition of Methanosarcina Species

Volatile fatty acids (VFAs) and methane from food waste and cow slurry: Comparison of biogas and VFA fermentation processes

Anaerobic Digestion Technology for Methane Production Using Deer Manure Under Different Experimental Conditions

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