Exploitation of rapid acidification phenomena of food waste in reducing the hydraulic retention time (HRT) of high rate anaerobic digester without conceding on biogas yield

Kuruti, Kranti; Begum, Sameena; Ahuja, Shruti; Anupoju, Gangagni Rao; Juntupally, Sudharshan; Gandu, Bharath; Ahuja, Devender Kumar

doi:10.1016/j.biortech.2016.12.005

Cited by 46 publications

(10 citation statements)

References 11 publications

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“…In comparison to other processes, anaerobic digestion has the advantages of adapting to different work scales, treating a wider range of substrates, even with high or low moisture and impurities content [ 9 ], resulting in low environmental impacts [ 10 ] producing material able to be used as biofertilizers [ 11 ] and having high energy recovery potential [ [11] , [12] , [13] , [14] ].…”

Section: Introductionmentioning

confidence: 99%

Effects of temperature, proportion and organic loading rate on the performance of anaerobic digestion of food waste

Blasius

Contrera

Maintinguer

et al. 2020

Biotechnology Reports

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Section: Introductionmentioning

confidence: 99%

Effects of temperature, proportion and organic loading rate on the performance of anaerobic digestion of food waste

Blasius

Contrera

Maintinguer

et al. 2020

Biotechnology Reports

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“…It is well known that food waste (FW) is a high moisture content and easily biodegradable biomass, and bioconversion process is a mainstream method to minimize waste and realize bioenergy recovery simultaneously (Chen et al, 2017;Karmee, 2016;Kuruti et al, 2017). In 2012, over 1.6 billion tons of FW was generated worldwide (Ma et al, 2017a).…”

Section: Introductionmentioning

confidence: 99%

Improving the stability and efficiency of anaerobic digestion of food waste using additives: A critical review

Liu

et al. 2018

Journal of Cleaner Production

228

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Anaerobic digestion is an effective technology to treat food waste, with methane production as renewable bioenergy. However, there are two key problems in the practical application, i.e., poor system stability and low reactor efficiency. In this paper, additives used in anaerobic digestion of food waste were systematically reviewed in view of system stability and reactor efficiency. Enzymes showed excellent property in food waste pre-hydrolysis stage with almost all macromolecular matters being rapidly resolved. Fungi fermentation process to produce hydrolytic enzymes, can be regarded as a promising and low-cost way to realize rate-limiting step elimination. It can be also concluded that adding neutralizers, buffer chemicals and some other materials is effective to maintain the pH level for practical application. Trace metals in food waste are not enough but needed for methanogens activation in long term and high loading rate operation. In addition, direct interspecies electron transfer could be much helpful for intermediate refractory organic acids degradation and methanogenesis promotion with additives of conductive materials, which is also discussed and should be studied further in anaerobic digestion of food waste. Based on literature review, a new concept is proposed for further study, suggesting that after being well liquefied with enzyme pre-hydrolysis, food waste could be co-digested with landfill leachate in a high-rate anaerobic reactor stably, resulting in a high bioenergy recovery efficiency.

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“…Except on weekends, the reactors received different mixtures of organic wastes twice per day. The hydraulic retention time (HRT) was maintained for 30 days (Kuruti et al 2017) and the OLR ranged between 2.0 and 3.6 kg VS/m 3 .d with a stepwise of 0.4. Each tested set of parameters was performed in duplicate.…”

Section: Methodsmentioning

confidence: 99%

“…When it comes to economic viability, treatment performance as well as process capacity to manage different kinds of biowaste, anaerobic co-digestion (ACoD) seems to be the most advantageous solution relieving several environmental and energic concerns. As FW mono-digestion is often prone to acidi cation, ammonia and long chain fatty acids inhibition, the selection of suitable co-substrates is considered a key factor enhancing the stability of the process (Kuruti et al 2017, Sindhu et al 2019. In general, the choice of co-substrates for FW anaerobic treatment is done referring to their high buffering capacity, capacity on C:N ratio regulation and the broad range of nutrients required by the methanogens, etc.…”

Section: Introductionmentioning

confidence: 99%

Effects of Co-substrates’ Mixing Ratios and Loading Rate Variations on Food and Agricultural Wastes’ Anaerobic co-digestion Performance

Chaher

Engler

Nassour

et al. 2020

Preprint

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Tunisia is one of the developing countries which faces crucial challenges, the most prominent of which are the production of organic waste, the need for an appropriate waste treatment, and the demand for water and energy conservation. To this end, the present research was designed to develop a technical concept on closed cycle ‘biowaste to bioenergy’ treating food waste (FW) through combined biological processes. In this approach, semi-continuous anaerobic co-digestion (ACoD) of FW, wheat straw (WS), and cattle manure (CM) was tested to investigate the relationship between the effect of the feedstock mixtures and C:N ratio on biogas and digestate generation at different organic loading rates (OLRs) ranging from 2 to 3.6 kg VS/m3.d. Results showed that the mono-digested FW was optimal and reached 565.5 LN/kg VSin at an OLR of 2.4 kg VS/m3.d, and then a drop of biogas production was recorded. However, for co-digested substrates, the optimum mixture ratio was FW:CM 75:25, where 62%, 39.89%, 91.26%, 130.9% and 119.97% of the biogas yield improved for OLRs ranging from 2 to 3.6 kg VS/m3. d, respectively. Admittedly, the target of this work was to enhance the ACoD process, but it also examined the exploitation of different AD-effluents. Therefore, special attention was paid to the generated digestates to decide how it can be efficiently upcycled later. Thus, the closed cycle ‘biowaste to bioenergy’ treatment met two of the major Tunisian concerns: efficient organic waste management as well as sustainable bioenergy production.

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Exploitation of rapid acidification phenomena of food waste in reducing the hydraulic retention time (HRT) of high rate anaerobic digester without conceding on biogas yield

Cited by 46 publications

References 11 publications

Effects of temperature, proportion and organic loading rate on the performance of anaerobic digestion of food waste

Effects of temperature, proportion and organic loading rate on the performance of anaerobic digestion of food waste

Improving the stability and efficiency of anaerobic digestion of food waste using additives: A critical review

Effects of Co-substrates’ Mixing Ratios and Loading Rate Variations on Food and Agricultural Wastes’ Anaerobic co-digestion Performance

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