The effect of initial organic load of the kitchen waste on the production of VFA and H 2 in dark fermentation

Ślężak, Radosław; Grzelak, Justyna; Krzystek, L.; Ledakowicz, S.

doi:10.1016/j.wasman.2017.06.024

Cited by 74 publications

(28 citation statements)

References 39 publications

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“…The availability of feedstocks needed for the production of biofuels (e.g. waste gas, biomass and organic residues) can be largely guaranteed [18][19][20]. The types of biofuels that can be produced include bioethanol, biogas, biohydrogen, and biodiesel [18,21].…”

Section: Biofuelmentioning

confidence: 99%

RETRACTED ARTICLE: Metagenomics for taxonomy profiling: tools and approaches

et al. 2020

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The study of metagenomics is an emerging field that identifies the total genetic materials in an organism along with the set of all genetic materials like deoxyribonucleic acid and ribose nucleic acid, which play a key role with the maintenance of cellular functions. The best part of this technology is that it gives more flexibility to environmental microbiologists to instantly pioneer the immense genetic variability of microbial communities. However, it is intensively complex to identify the suitable sequencing measures of any specific gene that can exclusively indicate the involvement of microbial metagenomes and be able to advance valuable results about these communities. This review provides an overview of the metagenomic advancement that has been advantageous for aggregation of more knowledge about specific genes, microbial communities and its metabolic pathways. More specific drawbacks of metagenomes technology mainly depend on sequence-based analysis. Therefore, this 'targeted based metagenomics' approach will give comprehensive knowledge about the ecological, evolutionary and functional sequence of significantly important genes that naturally exist in living beings either human, animal and microorganisms from distinctive ecosystems.

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Section: Biofuelmentioning

confidence: 99%

RETRACTED ARTICLE: Metagenomics for taxonomy profiling: tools and approaches

et al. 2020

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“…As it is documented by Feng et al [13], one way of increasing the efficiency of the dark fermentation process is to add carbohydrates to the activated sludge (in the cited experiment it was rice), what increased the C/N ratio of the reaction broth. It is particularly important since the C/N ratio in the sludge oscillates around 7 [32]. In the conducted dark fermentation processes apart from VFA, there were also produced H 2 and CO 2 (Fig.…”

Section: Resultsmentioning

confidence: 99%

Effect of pH on the Production of Volatile Fatty Acids in Dark Fermentation Process of Organic Waste

Grzelak

Ślężak

Krzystek

et al. 2018

Ecological Chemistry and Engineering S

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The aim of this study was to investigate the effect of pH on the dark fermentation process of kitchen waste by specifying the composition of the volatile fatty acids (VFA), H2 and by drawing the carbon balance. Studies were carried out in 8 dm 3 batch bioreactor in mesophilic conditions. The kitchen waste from the city of Lodz were used as a substrate. Based on the study, it was observed that most of the VFA was produced during the first two days of the process, while in the following days the production was diminished. The highest production of VFA (19.5 g/dm 3 ) was obtained in the bioreactor, where the pH was 7 and 8. Analyzing the produced VFA it was observed that mostly the acetic and butyric acid had been produced. Most of acetic acid (over 70 %) was obtained in fermenter with pH 7 and 8. In contrast, most of the butyric acid (over 40 %) was in the bioreactor with a pH of 6. Production of H2 was in the range from 4.29 to 26.5 dm 3 , wherein the largest amount of H2 was created in the bioreactor with a pH of 6.

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“…[8][9][10] The composition and concentration of these VFAs are inuenced by several factors, including hydraulic retention time (HRT), pH, initial organic load (IOL), inoculum to substrate ratio (ISR), C/N ratio, particle size and reactor modes. 6,[11][12][13][14] Most of the studies were reported for enhancement of VFA production through adjustment of pH by adding different chemicals. However, it is not economically viable at large-scale applications.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, disposal of bioreactors effluent with high concentration of chemicals may lead to high cost and can have negative impacts on bacterial community. 13 Some studies reported that VFAs could be efficiently produced without articially controlling the pH. 15,16 The pH can be elevated by applying different processing methods such as ultrasonication pretreatment, 17 change in temperature 45-70 C, 18,19 ISR 0.2-1 (ref.…”

Section: Introductionmentioning

confidence: 99%